期刊
ELECTROCHIMICA ACTA
卷 418, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2022.140351
关键词
Palladium; Electrocatalysis; Fuel cells; Ethanol; Formate; X-ray absorption spectroscopy
资金
- Italian National Research MIUR project [2017YH9MRK]
- FISR 2019 project AMPERE [FISR2019_01294]
- Tuscany Regional project Fotonica ed Elettronica Integrate per l'industria [DD 5262 del 09/11/2015]
The research discusses the dissolution of palladium in alkaline direct ethanol fuel cells and direct alkaline formate fuel cells, with results showing an increase in palladium loss under high anodic stresses.
Palladium is one of the best anodic catalysts for Alkaline Direct Alcohol Fuel Cell (DAFC) applications. However, its adoption in Fuel Cells (FCs) is still limited because of the deactivation of the catalyst, which hinders the long-term performance stability of the devices. In this article, we report the results of a Fixed Energy X-Ray Absorption Voltammetry (FEXRAV) investigation of a carbon-supported palladium electrocatalyst operating in a complete alkaline direct ethanol fuel cell (DEFC). Our results show palladium dissolution unambiguously, especially at cell polarizations corresponding to high anodic stresses. We have also investigated the behaviour of Pd electrocatalyst in a direct alkaline formate fuel cell (DFFC). Data show that when using formate as a fuel, the electrode Pd loss is negligible compared to the case of DEFC.
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