期刊
ACS CATALYSIS
卷 8, 期 5, 页码 4257-4265出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.8b00820
关键词
cobalt; cerium; electrocatalyst; oxygen evolution reaction; synchrotron
资金
- Welch Foundation [F-1436, F-1841]
- National Science Foundation [CHE-1664941]
Included among the many challenges regarding renewable energy technology are improved electrocatalysts for the oxygen evolution reaction (OER). In this study, we report a novel bifunctional electrocatalyst based on a highly dense CoOx catalyst by introducing CeOx The CoOx catalyst is fabricated by two-step electrodeposition, including Co seed formation, to obtain a very dense, layered structure, and CeOx is also successfully deposited on the CoOx catalyst. CoOx is an active catalyst showing good activity (eta = 0.331 V at 10 mA cm(-2)) and also stability for the OER. Higher activity is observed with the CeOx/CoOx electrocatalyst (eta = 0.313 V at 10 mA cm(-2)). From mechanistic studies conducted with synchrotron-based photoemission electron spectroscopy and DFT calculations, Ce promotes a synergistic effect by perturbing the electronic structure of surface Co species (facile formation to CoOOH) on the CoOx catalyst and optimizes the binding energy of intermediate oxygenated adsorbates.
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