Evaluation for sintering of electrocatalysts and its effect on voltage drops in high-temperature proton exchange membrane fuel cells (HT-PEMFC)

被引：30

作者：

Suzuki, Ai ^{[1
]}

Oono, Yuka ^{[2
]}

Williams, Mark C. ^{[1
]}

Miura, Ryuji ^{[1
]}

Inaba, Kenji ^{[1
]}

Hatakeyama, Nozomu ^{[1
]}

Takaba, Hiromitsu ^{[1
]}

Hori, Michio ^{[2
]}

Miyamoto, Akira ^{[1
]}

机构：

[1] Tohoku Univ, New Ind Creat Hatchery Ctr, Aoba Ku, Sendai, Miyagi 9808579, Japan

[2] Daido Univ, Fuel Cell Res Ctr, Minami Ku, Nagoya, Aichi 4578530, Japan

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2012年 / 37卷 / 23期

关键词：

High-temperature PEMFC; Sintering; Voltage drops; Electrocatalyst; Phosphoric acid; Durability; ACID-DOPED POLYBENZIMIDAZOLE; GAS-DIFFUSION ELECTRODES; PHOSPHORIC-ACID; CATALYST LAYER; OXYGEN REDUCTION; MATHEMATICAL-MODEL; PERFORMANCE DEGRADATION; NUMERICAL-SIMULATION; NONISOTHERMAL MODEL; MASS-TRANSPORT;

D O I：

10.1016/j.ijhydene.2012.09.016

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Durability performance such as sintering and voltage drops of HT-PEMFC was theoretically evaluated under non-humid conditions at 150 degrees C, 170 degrees C and 190 degrees C. The quantum chemical molecular dynamics showed that the affinity of the platinum (Pt) electxocatalysts with carbon support decreased with increasing temperature. The degree of agglomeration of electrocatalysts over time simulated by three-dimensional kinetic Monte Carlo method was compared and quantitatively agreed with experimentally measured Transmission Electron Microscopy (TEM) results. Agglomeration of electrocatalysts due to the sintering caused losses of electrochemically active surface area, and found to be occurred more severe as temperature increased. Decreased rate of the proton conductivity due to the evaporation of phosphoric acid affected voltage drops as temperature increased. A theoretical breakdown of the voltage drops indicated that the voltage drops that occurred during the first several hundreds of hours and those occurring for the latter stage were due to different effects. Copyright (c) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：18272 / 18289

页数：18

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