Analysis of the Effect of Surface Diffusion on Effective Diffusivity of Oxygen in Catalyst Layer by Direct Simulation Monte Carlo

Tomoki Hori, Takuya Mabuchi, Ikuya Kinefuchi, Takashi Tokumasu

研究成果: Conference contribution

抄録

We analyzed the transport properties of oxygen molecules using the Monte Carlo method. We obtained the effective diffusion coefficient of oxygen molecules in a catalyst layer of polymer electrolyte fuel cells. In this calculation system, when oxygen molecules hit a wall, it diffuses on the ionomer surface for a period of time and then diffusely reflected. The simulation was performed using various conditions of the surface diffusion. The conditions are defined by the surface diffusion coefficient and the time constant that controls the residence time of oxygen molecules. When the surface diffusion coefficient is small, the increase in the time constant results in the decrease in the effective diffusion coefficient of oxygen. However, when the surface diffusion coefficient is large, as the time constant increases, the effective diffusion coefficient of oxygen has a peak value and then decreases. This phenomenon occurs due to the three-dimensional bending structure of the catalyst layer. When an oxygen molecule moves along the bending three-dimensional structure, the distance along the ionomer surface becomes larger than the straight line segment between the start and end points.

本文言語English
ホスト出版物のタイトル240th ECS Meeting - Polymer Electrolyte Fuel Cells and Electrolyzers 21 (PEFC and E 21)
出版社IOP Publishing Ltd.
ページ371-376
ページ数6
8
ISBN(電子版)9781607685395
DOI
出版ステータスPublished - 2021
イベント240th ECS Meeting - Orlando, United States
継続期間: 2021 10 102021 10 14

出版物シリーズ

名前ECS Transactions
番号8
104
ISSN(印刷版)1938-6737
ISSN(電子版)1938-5862

Conference

Conference240th ECS Meeting
国/地域United States
CityOrlando
Period21/10/1021/10/14

ASJC Scopus subject areas

  • 工学(全般)

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