期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 7, 期 11, 页码 6012-6020出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta12295d
关键词
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资金
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme [681292]
- PECHouse3 project from the Swiss Federal Office of Energy [SI/500090-03]
- Chinese Thousand Talents Program for Young Professionals
- Denison University Research Foundation
The harvesting of sunlight by a photoelectrochemical (PEC) cell to split water into hydrogen and oxygen is an attractive strategy to store solar energy in the form of chemical bonds. The oxygen evolution reaction (OER) remains a bottleneck for the development of efficient PEC devices. Here we report a photoelectrochemical method to homogeneously deposit a cobalt-iron oxide (CoFeOx) catalyst on a nanostructured hematite photoanode. An ultrathin catalyst layer (<1 nm) yielded a 200 mV cathodic shift of onset potential and a photocurrent density of 1.6 and 2.5 mA cm(-2) at 1.0 V and 1.23 vs. RHE in 1 M KOH, respectively. We investigated the enhancement of photoactivity induced by the addition of the CoFeOx layer by impedance spectroscopy, photoluminescence, and by using H2O2 as a hole scavenger. This work points to the effective utilization of subnanometric coatings as efficient catalyst overlayers to enhance the OER activity of photoanodes.
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