期刊
ACS APPLIED ENERGY MATERIALS
卷 2, 期 5, 页码 3131-3141出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b02142
关键词
oxygen reduction reaction; proton exchange membrane fuel cell; platinum alloy; metal dissolution; electrochemical flow cell coupled to inductively coupled plasma mass spectrometer
资金
- Slovenian Research Agency (ARRS) through the Research Core Funding Programme [P2-0152, P2-0393, Z2-8161, Z1-9165]
- NATO Science for Peace Project DURAPEM [EAP.SFPP 984925]
Understanding of less-noble-metal (M) dissolution from Pt-alloy-based oxygen reduction reaction (ORR) electrocatalysts, as well its interaction with Pt surface, is crucial for maximizing their performance. In pursuing this goal, two ORR electrocatalysts-a benchmark Pt-Co/C and an in-house designed Pt-Cu/C materials-are investigated. Both are characterized with a range of standard techniques, such as X-ray diffraction (XRD), transmission electron microscopy (TEM) combined with energy dispersive spectroscopy (EDX) and thin film-rotating disc electrode (TF-RDE) measurements. A special focus is put on combining the latter with a highly sensitive electrochemical flow cell (EFC) online connected to inductively coupled plasma mass spectrometry (ICP-MS) measurements. A combination of standard and novel techniques provides unprecedented insights into the dissolution behavior and dynamics of metals, as well as their subsequent surface interactions and effects on the electrochemical performance. A special focus is devoted to the significance of electrocatalyst activation protocols and their effects on metal dissolution. Distinct differences in the behavior of Pt-Cu and Pt-Co alloys are revealed, which will help develop proper protocols for practical implementation of Pt-alloy electrocatalysts.
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