In-Operando Anomalous Small-Angle X-Ray Scattering Investigation of Pt3Co Catalyst Degradation in Aqueous and Fuel Cell Environments
In-Operando Anomalous Small-Angle X-Ray Scattering Investigation of Pt3Co Catalyst Degradation in Aqueous and Fuel Cell Environments
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DOI：
10.1149/2.0531514jes
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发表时间：
2015-01-01
影响因子：
3.9
通讯作者：
Myers, Deborah J.
中科院分区：
文献类型：
--
作者：
Gilbert, James A.;Kropf, A. Jeremy;Myers, Deborah J.
铂-钴合金纳米颗粒作为PEMFC的阴极催化剂受到极大关注，因为它们已被证明具有相对于铂增强的活性。然而，它们相对于Pt催化剂对电化学活性表面积损失的相对稳定性仍有争议。在这项研究中，Pt 3Co颗粒尺寸分布（PSD）在燃料电池和水环境中的演变，在加速应力测试（ASTs）使用在operando ASAXS。测量的演变表明，降解机制占主导地位的损失颗粒小于临界粒径（
Platinum-cobalt alloy nanoparticles are of great interest as cathode catalysts for PEMFCs as they have been shown to have enhanced activity versus platinum. However, their relative stability against loss of electrochemically-active surface area in relation to Pt catalysts is still debated. In this study, the evolutions of Pt3Co particle size distributions (PSDs) in fuel cell and aqueous environments were followed during accelerated stress tests (ASTs) using in-operando ASAXS. The measured evolutions showed a degradation mechanism dominated by loss of particles smaller than the critical particle diameter (