Oxygen reduction catalyst layer based on polyionic liquid as proton conductor and preparation method of oxygen reduction catalyst layer

A technology of polyionic liquid and proton conductor, which is applied in the field of oxygen reduction catalytic layer and its preparation, can solve the problems of greenhouse effect, environment and pollution, and achieve the effects of enhancing transmission performance, suppressing coverage, and excellent oxygen reduction activity

Inactive Publication Date: 2019-10-11
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The problem of energy and environment in today's world is the key to restricting the sustainable development of human society. The fossil energy with limited reserv

Method used

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  • Oxygen reduction catalyst layer based on polyionic liquid as proton conductor and preparation method of oxygen reduction catalyst layer
  • Oxygen reduction catalyst layer based on polyionic liquid as proton conductor and preparation method of oxygen reduction catalyst layer
  • Oxygen reduction catalyst layer based on polyionic liquid as proton conductor and preparation method of oxygen reduction catalyst layer

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Embodiment 1

[0037] A novel fuel cell oxygen reduction catalytic layer based on a polyionic liquid proton conductor and a preparation method thereof, comprising the following steps:

[0038] (1) Preparation of copolymer precursor: under the protection of nitrogen, add 2.7mL of anhydrous 1,4-dioxane to the reaction flask, with styrene:N,N-dimethylvinylbenzylamine moles Add 1.51g of styrene and 1.0g of N,N-dimethylvinylbenzylamine in sequence at a ratio of 7:3, the monomer volume concentration is 50%, and then add 0.8% of azobisisobutyronitrile by monomer mass 0.02g. After stirring evenly, after 3 cycles of freezing-vacuumizing-thawing to remove residual oxygen in the reaction bottle, then place the reaction bottle in an oil bath at 60±1°C for free radical copolymerization for 24 hours. After the reaction, put the product in a large amount of frozen ethanol Precipitate in a mixed solvent with a volume ratio of 1 / 4 of deionized water, and wash for several times, and then vacuum-dry the washe...

Embodiment 2

[0042] Experimental procedure is identical with embodiment 1, and difference is: the massfraction of the proton type polyionic liquid copolymer solution used in the configuration of catalyst ink in step (3) is 5Wt%, the electrochemical performance of the novel catalytic layer prepared The active area is 81.17m 2 / g, the proton impedance is 1.47Ωcm 2 , the coverage of inactive oxides on the platinum surface was 24.74%.

Embodiment 3

[0044] Experimental procedure is identical with embodiment 1, and difference is: the massfraction of the proton type polyionic liquid copolymer solution used in the configuration of catalyst ink in the step (3) is 8Wt%, the electrochemical performance of the novel catalytic layer prepared The active area is 79.65m 2 / g, the proton impedance is 1.36Ωcm 2 , the coverage of inactive oxides on the platinum surface was 27.92%.

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Abstract

The invention discloses an oxygen reduction catalyst layer based on polyionic liquid as a proton conductor and a preparation method of the oxygen reduction catalyst layer. The method comprises the steps: carrying out copolymerization reaction on styrene monomer and N, N-dimethyl vinyl benzylamine to synthesize a proton-type polyion liquid copolymer; then, taking the copolymer based on the proton-type polyion liquid as a proton conduction layer and an adhesive, performing the ultrasonic dispersion of the copolymer, a catalyst, isopropanol and water, preparing catalyst ink, coating the surface of a glassy carbon electrode with the catalyst ink, and performing natural drying to obtain an oxygen reduction catalyst layer. Compared with the prior art, 1, the cost is lower, and the preparation process is simpler; 2, the catalyst layer has better proton conductivity than the traditional catalyst layer; 3, the novel catalyst layer can obviously inhibit the coverage of non-reactive active oxideson active sites of platinum and effectively enhance the transmission performance of oxygen on a proton conductor nano layer and a platinum interface, so that the oxygen reduction activity of the whole catalyst layer is improved, and the purpose of reducing the platinum loading capacity in the catalyst layer is expected to be achieved.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to an oxygen reduction catalytic layer based on a proton type polyionic liquid copolymer and a preparation method thereof. Background technique [0002] The problem of energy and environment in today's world is the key to restricting the sustainable development of human society. The fossil energy with limited reserves in the world is on the verge of exhaustion. emissions, and then formed the greenhouse effect and environmental pollution that endangers human survival. Finding and utilizing green and clean renewable energy will be an effective way to solve these two problems. Hydrogen energy, as a clean secondary energy source, has outstanding characteristics such as high energy storage density and zero carbon emission, and has attracted widespread attention. At the same time, building a hydrogen energy society is also considered to be the best idea for mankind to get rid of th...

Claims

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Application Information

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IPC IPC(8): H01M8/1023H01M8/1039H01M8/1072H01M8/1088C08F8/38C08F212/08C08F212/14
CPCC08F8/38C08F212/08C08F212/14H01M8/1023H01M8/1039H01M8/1072H01M8/1088H01M2008/1095Y02E60/50
Inventor 涂文懋黄磊张海宁严小聪
Owner WUHAN UNIV OF TECH
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