CN113219017A - Double-working-electrode electrochemical micro-channel flow cell device - Google Patents
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Abstract
The invention provides a double-working-electrode electrochemical microchannel flow cell, which comprises two working electrodes, a reference electrode, a counter electrode and a microchannel flowing through the electrodes, wherein the two working electrodes are respectively arranged at the upstream and the downstream of the same side of the microchannel, and the counter electrode is arranged at the other side of the microchannel. During use, an electrolyte solution containing the reactants flows into the microchannel upstream, and electrochemical reactions occur at the two electrodes, respectively, and then flow into a collection chamber containing a reference electrode solution. The flow cell can measure key parameters such as electrochemical reaction rate, reaction selectivity and the like under the cooperation of an electrochemical workstation.
Description
Technical Field
The invention relates to the technical field of electrochemistry, in particular to an electrochemical micro-channel flow cell device.
Background
In the field of electrochemistry, the research on key parameters such as electrochemical reaction rate, selectivity and the like by using a double-working electrode system is an important experimental means. The common double-working electrode system is a rotating ring disk electrode, which consists of a disk working electrode, a concentric ring working electrode positioned outside the disk, a counter electrode, a reference electrode and the like, wherein the rotating ring disk electrode is vertically immersed into electrolyte for reaction measurement in the use process. The surface of the rotating ring disk electrode can form a uniform and stable diffusion layer, and the thickness of the diffusion layer can be changed by changing the rotating speed so as to change the transfer rate. In the measuring process, reactants diffuse to the disc through convection, electrochemical reaction is carried out on the disc electrode to generate products and byproducts, the products and the byproducts reach the outer circular ring electrode under the action of centrifugal force, and electrochemical reaction is carried out on one of the products or the byproducts by controlling the potential on the circular ring. The reaction rate and selectivity are detected by detecting the potential and current signals of the loop formed by the disk electrode, the ring electrode and the counter electrode.
Although the ring-disk electrode is widely used, the electrode still has disadvantages: 1) the flow field on the surface of the electrode is not easy to be controlled repeatedly, and the change of the flow field can influence the response of electrochemical signals, so that the placement position of the electrode needs to be controlled more accurately in an experiment to ensure the repeatability of the experiment. 2) The two working electrodes, the counter electrode and the reference electrode are arranged in a fully mixed electrolytic cell, so that the influence of the mixed ions generated by the reaction is easy to generate. For example, chloride ions present in the internal fill of a silver/silver chloride electrode may migrate to the surface of the electrode and become adsorbed by the catalyst. 3) The electrode area of the ring disk electrode is very small, the surface of the ring electrode and the surface of the disk electrode are integrated together, so that the difficulty is caused in coating a catalyst, all electrodes need to be immersed in an electrolytic cell in an experiment, and the solution consumption is large. 4) The ring plate electrode has high manufacturing cost, and the rotating part is easy to damage after being used for a long time.
In order to solve the problems, the invention provides a double-working-electrode electrochemical microchannel flow cell device, which utilizes a method of arranging double working electrodes and counter electrodes on two sides of a microchannel to replace a double-rotating working electrode system of a ring-disk electrode, realizes the continuous flow of fluid on the surface of a fixed electrode, and ensures the repeatability of a measuring result. The area of the working electrode of the device is not limited by the flow component, and the catalyst to be measured can be conveniently coated. Reactant mass transfer is enhanced and electrochemical reaction time is controlled through micro-channels with different shapes and sizes, continuous reaction and detection are realized by working electrodes arranged at the upstream and the downstream, and material consumption is greatly reduced by using the micro-channels instead of a kettle type electrolytic cell. The flow cell device can be conveniently connected with an electrochemical workstation, and parts can be conveniently disassembled, replaced and cleaned, so that oxygen reduction and CO can be effectively ensured2Characterization of the performance of the reduction isocatalyst.
Disclosure of Invention
The invention aims to provide an electrochemical microchannel flow cell device, which solves the problems of inconvenience in coating a catalyst, large solution consumption, high cost and poor repeatability of the conventional rotating ring disk electrode-based method, utilizes a microchannel as a flow cell to carry out electrochemical reaction, and realizes measurement of electrochemical rate and selectivity by good channel design and electrode arrangement mode.
In order to solve the technical problem, the invention provides a double-working-electrode electrochemical microchannel flow cell device which comprises a supporting component, an upstream working electrode, a downstream working electrode, an electrolyte microchannel, a solution collecting chamber, a counter electrode and a reference electrode.
The support parts are positioned on two sides of the electrolyte microchannel and used for fixing electrodes, the upstream working electrode and the downstream working electrode are positioned on one side of the electrolyte microchannel, the counter electrode is positioned on the other side of the electrolyte microchannel, the three electrodes are in close contact with electrolyte through the electrolyte microchannel, the solution collecting chamber is positioned on the downstream of the electrolyte microchannel, and the reference electrode is arranged in the solution collecting chamber.
Wherein the electrolyte micro-channel is in the shape of a straight channel, a zigzag channel or a serpentine channel.
Wherein, the length of the electrolyte micro-channel is 2-30cm, the width is 0.5-5cm, and the depth is 0.1-1 mm.
Wherein the working areas of the upstream working electrode and the downstream working electrode exposed in the microchannel are both 0.1-15cm2。
Wherein the horizontal distance between the upstream working electrode and the downstream working electrode is 1-10 mm.
Wherein the working area of the counter electrode exposed in the microchannel is 0.1-15cm2。
Wherein, the electrolyte microchannel material is selected from polytetrafluoroethylene, copolymer of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene, fluorinated ethylene propylene copolymer and polymethyl methacrylate.
Wherein, the upstream inlet of the electrolyte microchannel is provided with a screwed joint connecting part which is connected with an external pumping fluid conveying system through a pipeline, and the downstream outlet of the solution collecting chamber is provided with a screwed joint connecting part which is connected with an external solution collecting bottle through a pipeline.
The invention has the advantages of
1) The invention is not limited to the use of 0.1-0.3cm for rotating the ring plate electrode2The area of the working electrode can be flexibly adjusted to meet the characterization requirements of different electrocatalysis systems;
2) the invention adopts the micro-channel to complete the electrolytic reaction, the material consumption is less, the flowing state of the electrolyte in the micro-channel is highly controllable, and the randomness of the electrochemical experiment result is reduced;
3) the invention adjusts the retention time difference between the two working electrodes by changing the relative position or flow velocity between the electrodes, meets the selective regulation and control requirements of different reaction systems, and simultaneously places the reference electrode at the downstream of the flow cell, thereby preventing the adverse effect of the ion leakage of the reference electrode on the reaction and reflecting the reaction condition more truly;
4) the device has a simple structure, can be subjected to modular packaging design, and can realize electrochemical representation of reactions such as oxygen reduction for generating hydrogen peroxide, water oxidation for generating hydrogen peroxide, carbon dioxide reduction and the like by a user only by selecting a proper module according to a reaction system.
Drawings
FIG. 1 is a schematic diagram of an electrochemical microchannel flow cell electrode structure;
figure 2 is a schematic diagram of an electrochemical microchannel flow cell electrode in combination with an external pumped fluid delivery system and electrochemical workstation.
Wherein, 1-a support member; 2-an upstream working electrode; 3-a downstream working electrode; 4-an electrolyte microchannel; 5-a solution collection chamber; 6-pair of electrodes; 7-a reference electrode; 8-electrochemical workstation.
Detailed Description
The invention provides a double-working-electrode electrochemical microchannel flow cell device which comprises a supporting component, an upstream working electrode, a downstream working electrode, an electrolyte microchannel, a solution collecting chamber, a counter electrode and a reference electrode.
The support parts are positioned on two sides of the electrolyte microchannel and used for fixing electrodes, the upstream working electrode and the downstream working electrode are positioned on one side of the electrolyte microchannel, the counter electrode is positioned on the other side of the electrolyte microchannel, the three electrodes are in close contact with electrolyte through the electrolyte microchannel, the solution collecting chamber is positioned on the downstream of the electrolyte microchannel, and the reference electrode is arranged in the solution collecting chamber.
The using method of the device specifically comprises the following steps:
firstly, leading electrolyte into a micro-channel at a flow rate of 0.001-10mL/min at a working temperature of-10-90 ℃ and respectively flowing through an upstream working electrode and a downstream working electrode;
secondly, coating an electrocatalyst to be characterized on an upstream working electrode, and applying a linear scanning voltage by using an electrochemical workstation to convert reactants into a product; to determine the selectivity of the reactants, a constant voltage is applied to the downstream working electrode, part of the product is electrolyzed, and the current response signal is measured, thereby calculating the selectivity;
in a third step, the electrolyte solution and the reactants flow through the microchannel and the solution collection chamber, such that the working electrode and the counter electrode on both sides of the microchannel and the reference electrode in the solution collection chamber form a double-working closed loop.
The electrolyte micro-channel is in the shape of a straight channel, a Z-shaped channel or a snake-shaped channel, the length is preferably 2-30cm, the width is preferably 0.5-5cm, and the depth is preferably 0.1-1 mm.
The working areas of the upstream working electrode and the downstream working electrode exposed in the microchannel are preferably 0.1-15cm2The horizontal distance between the two electrodes is preferably 1-10 mm.
The upstream working electrode is made of carbon paper, glassy carbon, carbon cloth, conductive carbon fiber, carbon tube film and glassy carbon fiber.
The downstream working electrode is made of platinum, zinc, copper and graphite.
The working area of the counter electrode exposed in the micro-channel is 0.1-15cm2。
The counter electrode is made of materials selected from platinum, zinc, copper and graphite.
The reference electrode is selected from a silver/silver chloride electrode, a calomel electrode, a mercury/mercury oxide electrode and a mercurous sulfate electrode.
The reference electrode is at least 10mm from the downstream working and counter electrodes.
The upstream working electrode is used for coating a catalyst to be detected, including but not limited to a monatomic catalyst, a metal nanoparticle catalyst, an oxide nanoparticle catalyst and the like, and further preferably a nickel catalyst, a copper platinum nickel alloy nanorod catalyst, a copper oxide nanoparticle catalyst and the like distributed on carbon black in a monatomic form, and the downstream working electrode is used for detecting a reaction product.
The electrolyte microchannel is made of polytetrafluoroethylene, a copolymer of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene, a fluorinated ethylene propylene copolymer and polymethyl methacrylate.
And the upstream inlet of the electrolyte microchannel is provided with a threaded joint connecting part which is connected with an external pumping fluid conveying system through a pipeline, and the downstream outlet of the solution collecting chamber is provided with a threaded joint connecting part which is connected with an external solution collecting bottle through a pipeline.
The supporting component is made of a material selected from polyetheretherketone, polyvinylidene fluoride, polyfluorinated ethylene propylene, polyvinyl chloride, polyphenylene sulfide, a copolymer of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene, and all the electrochemical circulating devices without the supporting device are integrated through a sealing gasket and a fastener.
The electrodes on two sides of the electrolyte microchannel are connected with an external lead through a conductive current collector, and the external lead can be connected with an electrochemical workstation to independently control the double working electrodes, the reference electrode and an electrochemical loop formed between the electrodes.
The following embodiments are described in detail to solve the technical problems by applying technical means to the present invention, and the implementation process of achieving the technical effects can be fully understood and implemented.
As shown in fig. 1 and 2, the electrochemical flow cell device provided by the present invention comprises a support member 1, an upstream working electrode 2, a downstream working electrode 3, an electrolyte microchannel 4, a solution collection chamber 5, a counter electrode 6, and a reference electrode 7.
The support component 1 is positioned at two sides of the microchannel 4 and used for fixing electrodes, wherein the upstream working electrode 2 and the downstream working electrode 3 are positioned at one side of the microchannel, the counter electrode 6 is positioned at the other side of the microchannel, and the three electrodes are in close contact with electrolyte through the microchannel 4; a solution collection chamber 6 is located downstream of the microchannel 4 and a reference electrode 7 is placed in the solution collection chamber 6.
The upstream inlet of the microchannel 4 is provided with a connection means for connection to a fluid delivery system and the downstream outlet of the solution collection chamber 6 is provided with a connection means for connection to a solution collection bottle.
EXAMPLE 1 Selective preparation of Hydrogen peroxide by reduction of oxygen in alkaline solution
The channel structure is as follows: the channel is formed by laser cutting a polytetrafluoroethylene plastic sheet with the length and the width of 2.5 cm. The channel has a length of 6cm, a width of 0.5mm, a depth of 1mm and a shape of a serpentine channel.
Electrode morphology: the working electrode 1 is made of carbon paper coated with CMK-3 conductive carbon material and the coating density is 0.3mg/cm2The length and width of the electrode are 1cm, forming a 1cm electrode2Square electrodes of (2). The contact area of the electrode and the channel is 0.3cm2. The working electrode 2 adopts a platinum sheet with the length and the width of 1cm, and the contact area of the electrode and the channel is 0.3cm2. The horizontal distance between the working electrodes 1 and 2 was 3 mm. The reference electrode was a mercury/mercury oxide electrode placed downstream of the two working electrodes. The counter electrode was placed on the opposite side of the two working electrodes using a platinum sheet 2cm in length and width.
The operating conditions are as follows: at the temperature of 10 ℃, 0.1mol/L KOH solution saturated with oxygen is used as electrolyte and pumped into an electrolytic cell by a constant flow pump at the flow rate of 1 mL/min. And respectively carrying out electrochemical control on the working electrode 1 and the working electrode 2 by using a double potentiostat. A loop formed by the working electrode 1, wherein the scanning speed is 5mV/s, and the scanning interval is 0-1V vs RHE; the working electrode 2 forms a loop, a constant potential is applied by a double potentiostat, and the potential is 1.3V vs RHE. And observing a current-voltage change curve given by the double potentiostats.
And (3) testing results: the limiting current of the working electrode 1 is 1.8mA, and the limiting current density is 6.0mA/cm2. The limiting current of the working electrode 2 is 0.75mA, the collection efficiency is 93 percent, and the limiting current density is 1.39mA/cm2. The selectivity to hydrogen peroxide is therefore calculated to be: 90.9 percent.
Comparative example 1: to test the selectivity of the CMK-3 catalyst for the reduction of oxygen in alkaline solution to hydrogen peroxide, CMK-3 was coated on a disk electrode with a ring disk electrode at a coating density of 0.3mg/cm2The catalyst was tested at 1600rpm and the electrolyte was 0.1M potassium hydroxide solution. The scanning rate of the ring electrode is 5mV/s, and the scanning interval is 0-1V vs RHE; the working electrode 2 forms a loop, a constant potential is applied by a double potentiostat, and the potential is 1.3V vs RHE. The current-voltage curves of the ring and disk electrodes were observed.
And (3) testing results: the limiting current of the disk electrode was 0.7mA, and the current of the ring electrode was 0.214 mA. The collection efficiency of the rotating ring disk electrode was only 37%. The selectivity to hydrogen peroxide was therefore calculated to be 90.5%. The selectivity of the electrode test was similar using both the disk electrode and the flow cell dual operation.
EXAMPLE 2 Selectivity of the preparation of Hydrogen peroxide by reduction of oxygen in neutral solution
The channel structure is as follows: the channel is formed by cutting a sheet material of perfluoropropyl perfluorovinyl ether with the length and width of 20cm and the thickness of 1mm by a laser cutter. The channel has a length of 60cm, a width of 5mm, a depth of 1mm and a serpentine channel shape.
Electrode morphology: the working electrode 1 was carbon paper coated with nitric acid oxidized xc-72. The coating density was 0.5mg/cm2The length and width of the electrode are 8cm, forming a 64cm electrode2The actual contact area of the electrode and the micro-channel is 15cm2. The working electrode 2 adopts a platinum sheet with the length and the width of 8cm, and the actual contact area of the electrode and the micro-channel is 15cm2. The horizontal distance between the working electrodes 1 and 2 was 5 mm. The reference electrode adopts a silver/silver chloride electrode and is arrangedIs placed downstream of the two working electrodes. The counter electrode was placed on the opposite side of the two working electrodes using a platinum sheet with a length and width of 2 cm.
The operating conditions are as follows: 0.05mol/L NaSO saturated with oxygen at 25 DEG C4The solution is used as electrolyte and pumped into an electrolytic cell by a constant flow pump at the flow rate of 1 mL/min. And respectively carrying out electrochemical control on the working electrode 1 and the working electrode 2 by using a double potentiostat. A loop formed by the working electrode 1, wherein the scanning speed is 3mV/s, and the scanning interval is 0-1V vs RHE; the working electrode 2 forms a loop, a constant potential is applied by a double potentiostat, and the potential is 1.3V vs RHE. And observing a current-voltage change curve given by the double potentiostats.
And (3) testing results: the working electrode 1 has a limiting current of 78mA and a limiting current density of 5.2mA/cm2. The limiting current of the working electrode 2 is 52.30mA, the collection efficiency is 85 percent, and the limiting current density is 3.49mA/cm2. The selectivity to hydrogen peroxide is therefore calculated to be: 88.2 percent.
Comparative example 2: to test the selectivity of the nitric acid oxidized xc-72 catalyst for the reduction of oxygen to hydrogen peroxide in neutral solution, the catalyst was coated on a disk electrode with a disk electrode ring and a density of 0.5mg/cm2The catalyst was tested at 1600rpm and the electrolyte was 0.05M NaSO4And (3) solution. The scanning rate of the ring electrode is 5mV/s, and the scanning interval is 0-1V vs RHE; the circuit formed by the working electrode 2 is applied with constant potential by a double potentiostat, and the potential is 1.3V vs RHE. The current-voltage curves of the ring and disk electrodes were observed.
And (3) testing results: the limiting current of the disk electrode was 0.91mA, and the current of the ring electrode was 0.161 mA. The collection efficiency of the rotating ring disk electrode was only 23%. The selectivity to hydrogen peroxide was therefore calculated to be 87%. The selectivity of the electrode test was similar using both the disk electrode and the flow cell dual operation.
EXAMPLE 3 Selective production of Hydrogen peroxide by reduction of oxygen in acidic solution
The channel structure is as follows: the electrolytic cell channel was cut from a sheet of fluorinated ethylene propylene copolymer having a thickness of 0.5mm and a length and width of 10cm by a laser cutter. The channel has a length of 9cm, a width of 1mm, a depth of 0.5mm and a straight channel shape.
Electrode morphology: the working electrode 1 was carbon paper coated with platinum carbon. The coating density was 2mg/cm2The length and width of the electrode are 4cm, forming a 16cm electrode2The actual contact area of the electrode and the micro-channel is 4cm2. The working electrode 2 adopts a platinum sheet with the length and the width of 4cm, and the actual contact area of the electrode and the micro-channel is 4cm2. The horizontal distance between the working electrodes 1 and 2 was 3 mm. The reference electrode was a calomel electrode placed downstream of the two working electrodes. The counter electrode was placed on the opposite side of the two working electrodes using a platinum sheet with a length and width of 4 cm.
The operating conditions are as follows: 0.05mol/L H saturated with oxygen at 15 DEG C2SO4The solution is used as electrolyte and is pumped into an electrolytic cell by a constant flow pump at the flow rate of 10 mL/min. And respectively carrying out electrochemical control on the working electrode 1 and the working electrode 2 by using a double potentiostat. A loop formed by the working electrode 1, wherein the scanning speed is 5mV/s, and the scanning interval is 0-1V vs RHE; the working electrode 2 forms a loop, a constant potential is applied by a double potentiostat, and the potential is 1.3V vs RHE. And observing a current-voltage change curve given by the double potentiostats.
And (3) testing results: the limiting current of the working electrode 1 is 18.8mA, and the limiting current density is 4.7mA/cm2. The limiting current of the working electrode 2 is 16.24mA, the collection efficiency is 97 percent, and the limiting current density is 4.06mA/cm2. The selectivity to hydrogen peroxide is therefore calculated to be: 94.21 percent.
Example 4 measurement of Faraday efficiency in the preparation of carbon monoxide by reduction of carbon dioxide
The channel structure is as follows: the electrolytic cell channel is formed by cutting a polymethyl methacrylate sheet material with the thickness of 1mm and the length and the width of 15cm through a laser cutter. The channel has a length of 100cm, a width of 0.5mm, a depth of 1mm and a serpentine channel shape.
Electrode morphology: the working electrode 1 adopts a conductor coated with monoatomic PtA carbon paper of an electro-carbon material. The coating density was 0.1mg/cm2The length and width of the electrode are 7cm, forming a 49cm electrode2Square electrodes of (2). The actual contact area of the flow cell with the membrane is 2.5cm2. The working electrode 2 adopts a platinum sheet with the length and the width of 1cm, and the actual contact area of the platinum sheet with the flow cell is 2cm2. The horizontal distance between the working electrodes 1 and 2 was 8 mm. The reference electrode was a mercury/mercury oxide electrode placed downstream of the two working electrodes. The counter electrode was placed on the opposite side of the two working electrodes using a platinum sheet with a length and width of 2 cm.
The operating conditions are as follows: at 30 ℃, 0.05mol/L NaSO saturated with carbon dioxide gas4The solution is used as electrolyte and pumped into an electrolytic cell by a constant flow pump at the flow rate of 3 mL/min. And respectively carrying out electrochemical control on the working electrode 1 and the working electrode 2 by using a double potentiostat. A loop formed by the working electrode 1, wherein the scanning speed is 5mV/s, and the scanning interval is-1-0.2V; the working electrode 2 forms a loop, and a constant potential is applied by a double potentiostat, and the potential is 0.34V. And observing a current-voltage change curve given by the double potentiostats.
And (3) testing results: the limiting current of the working electrode 1 is 12.58mA, and the limiting current density is 5.03mA/cm2. The limiting current of the working electrode 2 is 9.08mA, the collection efficiency is 98 percent, and the limiting current density is 4.54mA/cm2. The selectivity to carbon monoxide is therefore calculated to be: 84.8 percent.
Example 5 measurement of the Collection efficiency of Potassium ferricyanide solution
The channel structure is as follows: the electrolytic cell channel was cut from a fluorinated ethylene propylene copolymer sheet material having a thickness of 0.7mm and a length and width of 10cm by a laser cutter. The channel has a length of 10cm, a width of 0.7mm, a depth of 0.7mm and a straight channel shape.
Electrode morphology: the working electrode 1 is made of carbon paper coated with a conductive carbon material having gold-nickel composite nanoparticles as an active center. The coating density was 0.1mg/cm2The length and width of the electrode are 4cm, forming a 16cm electrode2Square electrodes of (2). The working electrode 2 adopts a platinum sheet with the length and the width of 4cm,the actual contact area of the micro-channel and the micro-channel is 0.3cm2. The reference electrode was a calomel electrode placed downstream of the two working electrodes. The counter electrode was placed on the opposite side of the two working electrodes using a platinum sheet with a length and width of 2 cm.
The operating conditions are as follows: 5mM potassium ferricyanide solution +5mM potassium ferrocyanide solution 0.1M potassium hydroxide as electrolyte was pumped into the cell at a flow rate of 2mL/min using an advection pump at 20 ℃. And respectively carrying out electrochemical control on the working electrode 1 and the working electrode 2 by using a double potentiostat. A loop formed by the working electrode 1, wherein the scanning speed is 5mV/s, and the scanning interval is 0-0.6V vs RHE; the working electrode 2 forms a loop, a constant potential is applied by a double constant potential instrument, and the potential is 0.6V. And observing a current-voltage change curve given by the double potentiostats.
And (3) testing results: when E is 0.6V, the current density of the working electrode 1 is 2.38mA/cm2The current density of the working electrode 2 was 2.24mA/cm2The total amount of potassium ferricyanate solution oxidized at the working electrode 1 and the amount of reduced potassium ferricyanate in the working electrode 2 were analyzed to calculate the collection efficiency of potassium ferricyanate at the flow rate and channel depth to be 94.12%.
Comparative example 3: to test the collection efficiency of the disk electrode, a 5mM potassium ferricyanide solution +5mM potassium ferrocyanide in 0.1M potassium hydroxide solution was used as the electrolyte and tested at 1600 rpm. For the disk electrode, the scanning speed is 5mV/s, and the scanning interval is 0-0.6V vs RHE; for the ring electrode, a constant potential with the magnitude of 0.6V is applied by a double potentiostat. And observing a current-voltage change curve given by the double potentiostats.
And (3) testing results: when E is 0.6V, the current density of the working electrode 1 is 0.78mA/cm2The current density of the working electrode 2 was 0.179mA/cm2The total amount of oxidized potassium ferricyanate solution at the working electrode 1 and the amount of reduced potassium ferricyanate in the working electrode 2 were analyzed to calculate that the collection efficiency of potassium ferricyanate at this flow rate and channel depth was only 23%.
All of the above mentioned intellectual property rights are not intended to be restrictive to other forms of implementing the new and/or new products. Those skilled in the art will take advantage of this important information, and the foregoing will be modified to achieve similar performance. However, all modifications or alterations are based on the new products of the invention and belong to the reserved rights.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (8)
1. A dual-working-electrode electrochemical microchannel flow cell device, comprising: a support member, an upstream working electrode, a downstream working electrode, an electrolyte microchannel, a solution collection chamber, a counter electrode, and a reference electrode;
the support parts are positioned on two sides of the electrolyte microchannel and used for fixing electrodes, the upstream working electrode and the downstream working electrode are positioned on one side of the electrolyte microchannel, the counter electrode is positioned on the other side of the electrolyte microchannel, the three electrodes are in close contact with electrolyte through the electrolyte microchannel, the solution collecting chamber is positioned on the downstream of the electrolyte microchannel, and the reference electrode is arranged in the solution collecting chamber.
2. The electrochemical microchannel flow cell device of claim 1, wherein: the electrolyte micro-channel is in the shape of a straight channel, a Z-shaped channel or a snake-shaped channel.
3. The electrochemical microchannel flow cell device of claim 1, wherein: the electrolyte micro-channel has a length of 2-30cm, a width of 0.5-5cm and a depth of 0.1-1 mm.
4. The electrochemical microchannel flow cell device of claim 1, wherein the electrochemical microchannel flow cell device: the working areas of the upstream working electrode and the downstream working electrode exposed in the microchannel are both 0.1-15cm2。
5. The electrochemical microchannel flow cell device of claim 1, wherein: the horizontal distance between the upstream working electrode and the downstream working electrode is 1-10 mm.
6. The electrochemical microchannel flow cell device of claim 1, wherein: the working area of the counter electrode exposed in the micro-channel is 0.1-15cm2。
7. The electrochemical microchannel flow cell device of claim 1, wherein: the electrolyte microchannel is made of polytetrafluoroethylene, a copolymer of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene, a fluorinated ethylene propylene copolymer and polymethyl methacrylate.
8. The electrochemical microchannel flow cell device of claim 1, wherein: and the upstream inlet of the electrolyte microchannel is provided with a threaded joint connecting part which is connected with a pipeline of an external pumping fluid system, and the downstream outlet of the solution collecting chamber is provided with a threaded joint connecting part which is used for being connected with an external solution collecting bottle.
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| CN112473757A (en) * | 2020-11-19 | 2021-03-12 | 江南大学 | Micro-fluidic chip detection system for food safety rapid detection |
| CN112697864A (en) * | 2020-12-16 | 2021-04-23 | 浙江大学 | Integrated four-electrode gas sensor and preparation method and application thereof |
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| CN105572199A (en) * | 2015-12-17 | 2016-05-11 | 三诺生物传感股份有限公司 | Working electrode biological reactant and electrode type test strip |
| CN112473757A (en) * | 2020-11-19 | 2021-03-12 | 江南大学 | Micro-fluidic chip detection system for food safety rapid detection |
| CN112697864A (en) * | 2020-12-16 | 2021-04-23 | 浙江大学 | Integrated four-electrode gas sensor and preparation method and application thereof |
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| CN114660145A (en) * | 2022-03-23 | 2022-06-24 | 南京工业大学 | Rotary disk electrode device |
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