CN114262915A - HOF nanorod array electrode and application - Google Patents
HOF nanorod array electrode and application Download PDFInfo
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- CN114262915A CN114262915A CN202111582839.7A CN202111582839A CN114262915A CN 114262915 A CN114262915 A CN 114262915A CN 202111582839 A CN202111582839 A CN 202111582839A CN 114262915 A CN114262915 A CN 114262915A
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention belongs to the field of photoelectrocatalysis, and discloses an HOF nanorod array electrode and application thereof. The electrode comprises a substrate and HOF mixed mud slurry coated on the surface of the substrate; the HOF mixed mud slurry is prepared by ultrasonically mixing HOF, water, absolute ethyl alcohol and a binder. The invention uses the HOF nanorod array electrode as a catalyst for decomposing water by photoelectrocatalysis, and realizes high-efficiency hydrogen production by photoelectrolysis water through the synergistic effect of photocatalysis and electrocatalysis.
Description
Technical Field
The invention belongs to the field of photoelectrocatalysis, and particularly relates to an HOF nanorod array electrode and application thereof.
Background
Energy and environment are two major topics of social development today. The current energy sources still face the problems of exhaustion, environmental pollution and the like. Therefore, there is an urgent need to develop an energy source that is inexpensive, highly efficient, clean, and sustainable. The hydrogen energy is a clean new energy and is the most ideal substitute for the traditional energy such as coal, petroleum and the like. The water is abundant in storage on the earth, almost inexhaustible and inexhaustible, so that the hydrogen production by decomposing water is a sustainable, clean and environment-friendly energy preparation method. Among the many methods for producing hydrogen energy by decomposing water, photocatalytic and electrocatalytic decomposition of water is widely considered as a simple and easy-to-operate method for producing hydrogen.
In the process of photocatalytic water decomposition, the hydrogen production efficiency by photolysis of water in a pure water system is very low due to the recombination of photoproduction electrons and holes and the reverse reaction of the product hydrogen and oxygen. In the process of preparing hydrogen by electrocatalytic decomposition of water, the oxygen evolution process consumes large energy and is a main factor for restricting the development of industrial water decomposition technology. Noble metals such as Pt, Ru, Ir and oxides thereof (RuO)2And IrO2) The water has high hydrogen and oxygen evolution properties in catalytic electrolysis, but has high price, less reserves and scarce resources. Therefore, the research of a high-efficiency water decomposition method is a primary task of researchers at present.
Photoelectrocatalysis is a special heterogeneous catalysis, which refers to a process that photoproduction electron-hole pairs generated when light irradiates and an electrolyte contacts with the surface of a semiconductor are separated by an electric field of the semiconductor/the electrolyte and then generate oxidation-reduction reaction with ions in a solution. The application of the photoelectrocatalysis technology in the field of hydrogen production by photoelectrolysis water can reduce the damage of the combustion of fossil fuel to the environment on the one hand, and can generate hydrogen which is a green energy with high combustion value on the other hand, thereby relieving the energy crisis, really realizing the green, circular and sustainable development of human society while solving the two most troublesome problems of human beings, and being a measure which benefits the whole human beings.
The electrode material capable of being used for photoelectrocatalysis not only needs to have photocatalytic activity, namely certain photoresponse capability, but also needs to have electrocatalysis activity, and the advantages of the photocatalysis and the electrocatalysis are combined to realize the catalytic effect of 1+1 & gt 2. Currently, HOF has the characteristics of high crystal quality, large specific surface area, adjustable structure, low skeleton density, low cost, good chemical stability and the like, so that an HOF nanorod array electrode and application thereof in a water photoelectrocatalytic decomposition technology are urgently needed to be provided.
Disclosure of Invention
The invention aims to provide an HOF nanorod array electrode and application thereof, aiming at the defects of the prior art. The invention uses the HOF nanorod array electrode as a catalyst for decomposing water by photoelectrocatalysis, and realizes high-efficiency hydrogen production by photoelectrolysis water through the synergistic effect of photocatalysis and electrocatalysis.
In order to achieve the above object, the present invention provides, in one aspect, an HOF nanorod array electrode comprising a substrate and an HOF mixed slurry coated on a surface of the substrate;
the HOF mixed mud slurry is prepared by ultrasonically mixing HOF, absolute ethyl alcohol and a binder.
According to the present invention, preferably, the HOF, the absolute ethanol and the binder are used in a ratio of (15 to 25) g: (2-4) g: 1L of the compound.
According to the present invention, preferably, the HOF, the absolute ethanol and the binder are used in a ratio of (20 to 25) g: (2.5-3) g: 1L of the compound.
According to the invention, preferably, the substrate is a platinum-carbon substrate; before use, the platinum-carbon substrate is polished by alumina powder and then coated with HOF mixed mud slurry, as shown in figure 1.
In the invention, the HOF nanorod array electrode is stored in a vacuum drying environment.
The invention also provides application of the HOF nanorod array electrode in preparation of hydrogen by photoelectrocatalysis water decomposition.
According to the invention, preferably, the photoelectrocatalysis water decomposition is carried out to prepare hydrogen by adopting a three-electrode photoelectrochemical electrolytic cell closed system, and the HOF nanorod array electrode is a working electrode.
According to the present invention, preferably, the active area of the HOF nanorod array electrode is (0.8-1.5) cm × 1.5 cm.
According to the invention, preferably, the counter electrode of the closed system of the three-electrode photoelectrochemical electrolytic cell is a platinum electrode and the reference electrode is a saturated Ag/AgCl electrode.
According to the invention, preferably, the electrolyte of the closed system of the three-electrode photoelectrochemical electrolytic cell is Na2SO3Aqueous solution, Na2At least one of an aqueous S solution and sulfuric acid.
According to the invention, preferably, the light source for preparing hydrogen by photoelectrocatalysis water decomposition is a 250-350W xenon lamp, and the illumination intensity is 300-340mWcm-2The illumination time is 25-35 min.
In the invention, the HOF nanorod array electrode can be tested for quality by using an electrochemical workstation, and before testing, the HOF nanorod array electrode is washed by using ethanol.
The technical scheme of the invention has the following beneficial effects:
(1) according to the invention, the HOF nanorod array electrode is used as a catalyst for decomposing water by photoelectrocatalysis, and the high-efficiency hydrogen production by photoelectrolysis water is realized through the synergistic effect of the HOF nanorod array electrode and photocatalysis;
(2) according to the invention, the HOF nanorod array electrode is applied to the technology of preparing hydrogen by decomposing water through photoelectrocatalysis, so that the problems of high cost and low efficiency in the traditional photoelectrolysis water are solved, the required equipment is simple, the technological process is easy to control, the purity of the obtained product is high, and the cost is saved;
(3) the technology for preparing hydrogen by photoelectrocatalysis water decomposition has the advantages of clean and pollution-free by-products and high hydrogen yield.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
FIGS. 1(a), (b) show the microstructure of an HOF provided in example 1 of the present invention.
Fig. 2 is a schematic diagram illustrating a preparation process of an HOF nanorod array electrode according to embodiment 1 of the present invention.
FIG. 3(a) shows a HOF nanorod array electrode provided in example 1 of the present invention at H2SO4Aqueous solution (0.5mol L)-1) Polarization curve (wherein: LSV is polarization curve, Current is Current, Potential is voltage, and test temperature is room temperature)
Fig. 3(b) shows the tafel slope calculated by the polarization curve of fig. 3(a) for an HOF nanorod array electrode provided in example 1 of the present invention. (wherein, Current is Current and Potential is voltage)
Fig. 3(c) shows nyquist plot (test temperature is room temperature) of an HOF nanorod array electrode provided in example 1 of the present invention at an open circuit voltage potential.
Fig. 3(d) shows a voltammetry cycling curve of an electrode of an HOF nanorod array provided in example 1 of the present invention before and after 800 CV cycles. (wherein, Current is Current, Potential is voltage, and the testing temperature is room temperature)
FIG. 4 is a graph showing the change in the content of hydrogen gas produced by photoelectrocatalytic decomposition of water according to example 1 of the present invention with time, which is measured by a gas chromatography technique. (wherein, H2evolution is H2Evolution of content)
FIG. 5 shows a graph of the evolution rate of hydrogen gas by photoelectrocatalytic decomposition of water according to example 1 of the present invention as measured by gas chromatography techniques over time. (wherein, H2evolution is H2Evolution of precipitation Rate
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In the following examples, the HOF is PFC-11, and the preparation method of PFC-11 is described in Record compatibility in the catalysis of Three ports hydrosynthesis.
Example 1
The embodiment provides an HOF nanorod array electrode, which comprises a platinum-carbon substrate and HOF mixed slurry coated on the surface of the platinum-carbon substrate;
the HOF mixed slurry is prepared by ultrasonically mixing 5mg HOF (shown in FIGS. 1(a) and (b)) with 750. mu.L of absolute ethanol and 250. mu.L of Nafion (117 perfluorinated resin solution of Macklin).
And (3) polishing the platinum-carbon substrate by alumina powder before use, coating HOF mixed slurry, and obtaining the HOF nanorod array electrode after 5min, wherein the HOF nanorod array electrode is shown in figure 2.
In this embodiment, the HOF nanorod array electrode is applied to the preparation of hydrogen by photoelectrocatalysis decomposition of water, specifically: the photoelectrocatalysis water decomposition is used for preparing hydrogen by adopting a three-electrode photoelectrochemistry electrolytic cell closed system, the HOF nanorod array electrode is a working electrode, and the effective area is 1.0cm multiplied by 1.5 cm;
the counter electrode is a platinum electrode;
the reference electrode is a saturated Ag/AgCl electrode;
the light source is a 300W xenon lamp; the illumination intensity is 320mWcm-2The illumination time is 30 min;
the electrolyte was sulfuric acid with a concentration of 0.5 mM.
In the application process, hydrogen is generated on the platinum electrode, the hydrogen is in a closed system at the moment, the reaction is stopped after a period of time, gas with the volume of 50 mu L is injected and taken out by using a gas chromatography needle and is injected into a gas chromatography to detect the content of the hydrogen, and a graph (figure 4) showing the change of the content of the hydrogen along with time and a graph (figure 5) showing the change of the evolution rate of the hydrogen along with time are obtained by using a standard curve.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. The electrode is characterized by comprising a substrate and HOF mixed slurry coated on the surface of the substrate;
the HOF mixed mud slurry is prepared by ultrasonically mixing HOF, absolute ethyl alcohol and a binder.
2. The HOF nanorod array electrode of claim 1, wherein the amount ratio of the HOF, the absolute ethanol, and the binder is (15-25) g: (2-4) g: 1L of the compound.
3. The HOF nanorod array electrode of claim 2, wherein the amount ratio of the HOF, the absolute ethanol, and the binder is (20-25) g: (2.5-3) g: 1L of the compound.
4. The HOF nanorod array electrode of claim 1, wherein the substrate is a platinum carbon substrate.
5. Use of the HOF nanorod array electrode of any one of claims 1-4 in the preparation of hydrogen by photoelectrocatalytic decomposition of water.
6. The use of claim 5, wherein the photoelectrocatalytic decomposition of water to produce hydrogen gas employs a three-electrode photoelectrochemical cell closed system, and the HOF nanorod array electrode is a working electrode.
7. The use of claim 6, wherein the HOF nanorod array electrode has an effective area of (0.8-1.5) cm x 1.5 cm.
8. The use according to claim 6, wherein the counter electrode of the three-electrode photoelectrochemical cell closure system is a platinum electrode and the reference electrode is a saturated Ag/AgCl electrode.
9. The use according to claim 6, wherein the electrolyte of the closed system of the three-electrode photoelectrochemical cell is Na2SO3Aqueous solution, Na2At least one of an aqueous S solution and sulfuric acid.
10. The application of the light source as claimed in claim 6, wherein the light source for preparing hydrogen by photoelectrocatalytic decomposition of water is a 250-350W xenon lamp, and the illumination intensity is 300-340mWcm-2The illumination time is 25-35 min.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110479320A (en) * | 2019-08-22 | 2019-11-22 | 内蒙古民族大学 | A kind of efficiently difunctional decomposition water power catalyst and preparation method thereof |
| CN112246286A (en) * | 2020-10-20 | 2021-01-22 | 大连理工大学 | Preparation method and application of coordination polymer-based electrocatalyst |
| CN113201144A (en) * | 2021-04-30 | 2021-08-03 | 北京科技大学 | Rigid tetracarboxyl hydrogen bond organic framework material and preparation and application thereof |
| EP3871768A1 (en) * | 2020-02-27 | 2021-09-01 | Technische Universität Berlin | Semiconductive and proton-conductive porous hydrogen-bonded frameworks |
| CN113802143A (en) * | 2020-09-29 | 2021-12-17 | 河北科技大学 | Preparation method and application of hierarchical pore covalent organic framework compound and metal composite hydrogen evolution catalyst |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110479320A (en) * | 2019-08-22 | 2019-11-22 | 内蒙古民族大学 | A kind of efficiently difunctional decomposition water power catalyst and preparation method thereof |
| EP3871768A1 (en) * | 2020-02-27 | 2021-09-01 | Technische Universität Berlin | Semiconductive and proton-conductive porous hydrogen-bonded frameworks |
| CN113802143A (en) * | 2020-09-29 | 2021-12-17 | 河北科技大学 | Preparation method and application of hierarchical pore covalent organic framework compound and metal composite hydrogen evolution catalyst |
| CN112246286A (en) * | 2020-10-20 | 2021-01-22 | 大连理工大学 | Preparation method and application of coordination polymer-based electrocatalyst |
| CN113201144A (en) * | 2021-04-30 | 2021-08-03 | 北京科技大学 | Rigid tetracarboxyl hydrogen bond organic framework material and preparation and application thereof |
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