CN215728317U

CN215728317U - Solid oxide fuel cell half-cell test fixture

Info

Publication number: CN215728317U
Application number: CN202122079648.0U
Authority: CN
Inventors: 池波; 杨偲晨; 蒲健; 田云峰
Original assignee: Huazhong University of Science and Technology
Current assignee: Huazhong University of Science and Technology
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2022-02-01
Anticipated expiration: 2031-08-31

Abstract

The utility model belongs to the related technical field of fuel cells, and discloses a half-cell test fixture for a solid oxide fuel cell. The test fixture comprises a test tube, a guide tube, a metal wire and an electrode, wherein a sealing plug is arranged on the test tube, the guide tube penetrates through the sealing plug to be arranged in the test tube and is used for clamping a fuel cell to be tested, a plurality of through holes are formed in the guide tube, a part of the through holes are used as an air inlet and an air outlet for introducing fuel gas into the test tube, the other part of the through holes are used as a channel for allowing the metal wire to enter the test tube, the metal wire penetrating out of the bottom is used for binding the electrode on the guide tube, the fuel cell to be tested is clamped between a cathode electrode and an anode electrode to perform electrocatalytic reaction, and the current change in the reaction process is transmitted to the outside through the metal wire penetrating out of the top of the guide tube, so that the electrocatalytic reaction monitoring of the fuel cell is realized. The utility model solves the problems of complicated furnace transfer caused by the electrode material for testing combustible gas and the gas replacement in the testing process.

Description

Solid oxide fuel cell half-cell test fixture

Technical Field

The utility model belongs to the related technical field of fuel cells, and particularly relates to a half-cell test fixture for a solid oxide fuel cell.

Background

A Solid Oxide Fuel Cell (SOFC) belongs to the third-generation Fuel Cell, is an all-Solid-state chemical power generation device which directly converts chemical energy stored in Fuel and oxidant into electric energy at medium and high temperature with high efficiency and environmental friendliness, and is one of the current several Fuel cells with the highest theoretical energy density. It is widely recognized that a fuel cell will be widely used in the future as a Proton Exchange Membrane Fuel Cell (PEMFC).

The fuel gas is continuously introduced into the anode side of the solid oxide fuel cell, for example: hydrogen (H)₂) Methane (CH)₄) City gas, etc. the surface of the anode with catalytic action adsorbs fuel gas and diffuses to the interface of the anode and the electrolyte through the porous structure of the anode. Oxygen or air is continuously introduced into one side of the cathode, oxygen is adsorbed on the surface of the cathode with a porous structure, and O is generated under the catalytic action of the cathode₂Get electrons to O^2-Under the action of chemical potential, O^2-Enters a solid oxygen ion conductor which plays the role of an electrolyte, finally reaches the interface of the solid electrolyte and an anode due to diffusion caused by concentration gradient, reacts with fuel gas, and the lost electrons return to a cathode through an external circuit.

In the process of exploring for a suitable SOFC fuel electrode (anode) material, due to H₂The safety problem of combustible gas, not only combustible gas and NO, but also the impedance of the electrode material under the gas atmosphere can not be tested in an open environment_x、SO₂And the like, are also faced with the same problems. Meanwhile, in the process of researching the property change of the electrode after reduction, the research process becomes complicated due to the transfer of the furnace.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects or the improvement requirements of the prior art, the utility model provides a solid oxide fuel cell half-cell test fixture, which solves the problems of complicated furnace transfer caused by the replacement of gas in the test electrode material and the test process of combustible gas.

In order to achieve the above object, according to the present invention, there is provided a solid oxide fuel cell half cell test fixture, which comprises a cuvette, a conduit, a wire and an electrode, wherein the cuvette is used as a reaction site for electrocatalysis of a fuel cell, a sealing plug is arranged on the cuvette for sealing the cuvette, the conduit is arranged in the cuvette through the sealing plug for holding the fuel cell to be tested, a plurality of through holes are arranged in the conduit, a part of the through holes are used as a gas inlet and a gas outlet for introducing fuel gas into the cuvette, the other part of the through holes are used as a passage for the wire to enter the cuvette, one end of the wire penetrates through the top end of the conduit, the other end of the wire penetrates through the bottom of the conduit, the wire penetrating through the bottom is used for binding the electrode on the conduit, the electrode comprises a cathode and an anode, the fuel cell to be tested is clamped between the cathode and the anode to perform electrocatalytic reaction, and the current change in the reaction process is transmitted to the outside through the metal wire penetrating out of the top of the guide pipe, so that the electrocatalytic reaction of the fuel cell is monitored.

Further preferably, the metal wire is a platinum wire, and the electrode is a platinum mesh.

Further preferably, quartz wool is arranged below the sealing plug and used for heat insulation.

Further preferably, the catheter is wound with a binding band for fixing the catheter to avoid shaking of the catheter in the reaction.

Further preferably, the fuel cell to be electrolysed is less than 3cm in size.

Further preferably, the conduit is a ceramic tube.

Further preferably, in the through holes, the through holes arranged oppositely serve as passages for the metal wires to enter the test tubes, and short circuit caused by close intervals among the metal wires is avoided.

Generally, compared with the prior art, the technical scheme of the utility model has the following beneficial effects:

1. the test tube is used as a fuel cell electrode reaction place which is sealed and is suitable for testing fuel cells of combustible gas and toxic gas, and meanwhile, different gases pass through the test tube by arranging the guide tube in the test tube, and after one gas reaction is finished, only the gas in the test tube needs to be replaced, so that the electrocatalytic reaction in different fuel gases can be realized, a stove does not need to be converted, the test is simple and convenient, and the test efficiency is improved;

2. the test tube in the fuel cell is a test tube, the guide tube is a ceramic tube, the metal wire is a platinum wire, the electrode is a platinum wire mesh, and the selected materials are high-temperature-resistant materials, so that the influence of the change of the materials on the electrocatalysis reaction in the electrocatalysis process is avoided;

3. the test tube provided by the utility model is small in size, is suitable for electrocatalysis reaction of fuel cells with the size smaller than 3cm, and is simple in structure and wide in application range.

Drawings

FIG. 1 is a schematic diagram of a solid oxide fuel cell half cell test fixture constructed in accordance with a preferred embodiment of the present invention;

fig. 2 is a top view of a sealing plug constructed in accordance with a preferred embodiment of the utility model;

FIG. 3 is a schematic view of a catheter constructed in accordance with a preferred embodiment of the present invention;

fig. 4 is a graph showing the relationship between the impedance of half-cells constructed according to the preferred embodiment of the present invention at different temperatures in a hydrogen atmosphere.

The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:

1-test tube, 2-sealing plug, 3-conduit, 4-metal wire, 5-electrode, 6-bandage, 7-quartz cotton, 8-sealing tape, 9-fuel cell to be tested, and 10-through hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in fig. 1, a solid oxide fuel cell half cell test fixture comprises a single-port test tube 1 and a sealing plug 2, wherein the sealing plug is provided with two holes with proper intervals, a conduit 3 passes through the holes to serve as a transmission path of a circuit gas path, a metal wire 4 is arranged in the conduit 3, a plurality of through holes are arranged in the conduit 3, one part of the through holes serve as a gas inlet and a gas outlet, and the other part of the through holes serve as a passage for the metal wire 4 to enter the test tube 1. Electrodes 5 are bound to the conduit 3 by wires 4, between which a fuel cell 9 to be tested is arranged. In this embodiment, test tube 1 adopts the quartz transparent tube, and sealing plug 2 adopts the rubber buffer, and pipe 3 adopts the ceramic conduit, and wire 4 adopts the platinum silk, and electrode 5 adopts the platinum net, and through-hole 10 on the pipe is 4, and 2 are the passageway of wire, and 2 are air inlet and gas outlet in addition.

The wires 4 are wound with a misalignment to fix the electrodes 5 to prevent short circuits due to contact between the wires 4.

The sealing plug 2 is optionally perforated with a strip of holes, so that the two ducts 3 are separated by the rubber sealing plug 2.

Sealing tape 8 is adopted between sealing plug 2 and test tube 1 to seal, and the leakproofness is good, convenient to detach.

The longitudinal distance of the misalignment between the catheters 3 can be adjusted according to the area of the electrodes 5.

The distance between the two ducts 3 can be adjusted according to the selected outer diameter of the sealing plug 2.

The length of the guide tube 3 can be adjusted according to the length of the test tube 1.

The quartz wool 7 is arranged below the sealing plug 2, and the two guide pipes are moderately wound by the binding belt 6 below the quartz wool, wherein the binding belt is made of iron wires in the embodiment.

The utility model is further illustrated by the following specific examples.

With La_0.6Ca_0.4Fe_0.8Ni_0.2O₃For example, in the case of a YSZ half cell, the Nyquist plot of the EIS test results at 750 ℃ to 850 ℃ is shown in fig. 4, which is a complex plan view of the impedance, where the abscissa is the real axis and the ordinate is the imaginary axis, and it can be seen that the first intersection point of the curve with the real axis is the ohmic impedance and the second half is the polarization impedance, which is composed of two circular arcs. Both the ohmic resistance and the polarization resistance decrease with increasing temperature. The first arc of the polarization impedance represents the charge transfer in the battery system, and the second arc represents the adsorption and diffusion reaction of the gas on the surface of the electrode.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the utility model, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A solid oxide fuel cell half cell test fixture, characterized in that the test fixture comprises a test tube (1), a conduit (3), a wire (4) and an electrode (5), wherein,

the test tube (1) is used as a reaction site of electrocatalysis of the fuel cell, a sealing plug (2) is arranged on the test tube and used for sealing the test tube, the guide tube (3) penetrates through the sealing plug and is arranged in the test tube (1) and used for clamping the fuel cell (9) to be tested, a plurality of through holes (10) are arranged in the guide tube (3), one part of the through holes are used as an air inlet and an air outlet for introducing fuel gas into the test tube, the other part of the through holes are used as a passage for leading the metal wire into the test tube, one end of the metal wire (4) penetrates through the top end of the guide tube, the other end of the metal wire penetrates out of the bottom of the guide tube, the metal wire which penetrates out of the bottom is used for binding the electrode (5) on the guide tube, the electrode comprises a cathode and an anode, and the fuel cell to be tested is clamped between the cathode and the anode to carry out electrocatalysis, and the current change in the reaction process is transmitted to the outside through the metal wire penetrating out of the top of the guide pipe, so that the electrocatalytic reaction of the fuel cell is monitored.

2. The solid oxide fuel cell half cell test fixture of claim 1, wherein the metal wire (4) is a platinum wire, and the electrode (5) is a platinum mesh.

3. The solid oxide fuel cell half cell test fixture as claimed in claim 1 or 2, wherein quartz wool is arranged below the sealing plug (2) for thermal insulation.

4. The solid oxide fuel cell half cell test fixture of claim 1 or 2, wherein said conduit (3) is wrapped with a band (6) for fixing said conduit to avoid conduit wobble during reaction.

5. The solid oxide fuel cell half cell test fixture of claim 1, wherein the fuel cell to be tested has a diameter dimension of less than 3 cm.

6. The solid oxide fuel cell half cell test fixture of claim 2, wherein said conduit (3) is a ceramic tube.

7. The solid oxide fuel cell half cell test fixture as claimed in claim 1 or 2, wherein the through holes (10) are oppositely arranged to allow the wires to enter the test tube, thereby preventing short circuit caused by close spacing between the wires (4).