In Situ and Ex Situ Studies on the Degradation of Pd/C Catalyst for Proton Exchange Membrane Fuel Cells

Yongfu Tang, Shichun Mu, Sheng-xue Yu, Yufeng Zhao, Hongchao Wang, Faming Gao
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引用次数: 6

Abstract

To investigate the degradation mechanism of the as-prepared Pd/C catalyst, in situ and ex situ accelerated stress tests were carried out via potential cycling. Durability tests of the single cells with Pd/C catalysts were performed through an interval constant current density mode. Electrochemical impedance spectroscopy (EIS) was applied to measure the impedance of the single cell during degradation tests. Results indicate that the degradation of Pd/C catalyst may be attributed to the phase transition of absorbed α-phase PdH to β-phase PdH, the dissolution of Pd metal, and the size increase of Pd nanoparticles. Moreover, the degradation of single cell may be predominantly ascribed to the degradation of catalyst, the deterioration of contact between electronic/ionic conductors, as well as the flooding of gas diffusion channels.
质子交换膜燃料电池Pd/C催化剂降解的原位和非原位研究
为了研究制备的Pd/C催化剂的降解机理,通过电位循环进行了原位和非原位加速应力试验。采用间隔恒流密度模式对Pd/C催化剂单体电池的耐久性进行了测试。采用电化学阻抗谱法(EIS)测量单体电池在降解过程中的阻抗。结果表明,Pd/C催化剂的降解可能与吸收的α-相PdH向β-相PdH的相变、金属钯的溶解以及钯纳米粒子的尺寸增大有关。此外,单体电池的降解可能主要归因于催化剂的降解、电子/离子导体之间接触的恶化以及气体扩散通道的泛滥。
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来源期刊
自引率
0.00%
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审稿时长
6-12 weeks
期刊介绍: The Journal of Fuel Cell Science and Technology publishes peer-reviewed archival scholarly articles, Research Papers, Technical Briefs, and feature articles on all aspects of the science, engineering, and manufacturing of fuel cells of all types. Specific areas of importance include, but are not limited to: development of constituent materials, joining, bonding, connecting, interface/interphase regions, and seals, cell design, processing and manufacturing, multi-scale modeling, combined and coupled behavior, aging, durability and damage tolerance, reliability, availability, stack design, processing and manufacturing, system design and manufacturing, power electronics, optimization and control, fuel cell applications, and fuels and infrastructure.
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