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Cycling stability predicting model for cathode Pt-M catalyst and modeling method thereof

A technology of cycle stability and prediction model, applied in chemical process analysis/design, etc.

Active Publication Date: 2019-07-05
SHANGHAI JIAO TONG UNIV
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  • Description
  • Claims
  • Application Information

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It can also be used to guide the synthesis of new alloy catalysts

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  • Cycling stability predicting model for cathode Pt-M catalyst and modeling method thereof
  • Cycling stability predicting model for cathode Pt-M catalyst and modeling method thereof
  • Cycling stability predicting model for cathode Pt-M catalyst and modeling method thereof

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[0049] The invention relates to a cycle stability prediction model of a cathode Pt-M alloy catalyst. The model is a one-dimensional model, and the catalyst is assumed to be evenly distributed in the cross-sectional direction of the cathode catalyst layer. Considering the mutual bonding between the catalyst and the carbon support, all catalyst particles on the carbon support are assumed to be hemispherical, and the alloy catalyst structure exhibits a two-phase core-shell structure, where the shell layer is a pure Pt layer and the core phase is a homogeneous Pt-M alloy. In the model, the thickness direction of the catalytic layer is discretized into K control areas, and the catalyst particle size is discretized into j particle size groups. In each control area, the number of initial particles corresponding to a certain particle size group j of the catalyst can be obtained by It is obtained by fitting the ECSA and particle size distribution PSD before attenuation measured by the ...

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Abstract

The invention discloses a cycling stability predicting model for a cathode Pt-M catalyst and a modeling method thereof. The model comprises a surface Pt-turning model, an in-catalyst Pt and transitionmetal M dissolving model and a final whole material evolution model. In the model, a fact that an alloy catalyst structure is a two-phase core shell structure is reasonably hypothesized, wherein theparticle surface is a pure Pt housing, and the in-core part is a uniform Pt-M alloy phase. For aiming at damping of the alloy catalyst, the following damping mechanisms are considered: a particle surface Pt oxidizing process, a particle surface Pt Ostwald ripening process, a transition metal M atom dissolving-from-core process, a Pt<2+> and M<2+> diffusion process in a catalysis layer, and a process of reducing Pt<2+> on a CL / MEM interface by hydrogen gas which is penetrated from an anode for forming a Pt belt. For aiming at problems such as complicated durability testing process, high cost and time consumption in a proton exchange membrane fuel cell cathode catalyst durability testing process, the invention utilizes a modeling simulating process, thereby greatly reducing durability testing cost of the catalyst.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a cycle stability prediction model and a modeling method for a proton exchange membrane fuel cell cathode Pt-M catalyst. Background technique [0002] Proton exchange membrane fuel cell is a device that uses catalysts to convert hydrogen energy into electrical energy. It has the advantages of high conversion efficiency, green and pollution-free, and fast response speed. The membrane electrode is the most important part of the fuel cell, and it is also the place where the electrochemical reaction occurs, and the cathode, as the place for oxygen reduction, is the most important part, because the oxygen reduction reaction is the speed-determining part of the entire electrochemical reaction process. step, affecting the performance of the final fuel cell. At present, Pt-M alloy catalysts have been widely used in fuel cells due to their higher catalytic reactivity, but during the o...

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Application Information

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IPC IPC(8): G16C20/10
Inventor 章俊良郑志峰朱凤鹃罗柳轩魏光华夏国锋杨帆
Owner SHANGHAI JIAO TONG UNIV