Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 8, Issue 30, Pages 15140-15147Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta13492a
Keywords
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Funding
- National Natural Science Foundation of China [21878189, 51502177]
- Guangdong Basic and Applied Basic Research Foundation [2020A1515010379]
- Shenzhen Science and Technology Project Program [KQJSCX20170327151152722 JCYJ20190808144413257, JCYJ20180305125729925, JCYJ20170818092720054, JCYJ20190808145203535]
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In this study, FeO(x)and CoO(x)thin films were successively and uniformly coated on high-surface-area carbon nanotubes by plasma-enhanced atomic layer deposition, which formed a heterojunction of the two oxides. As an electrocatalyst in the oxygen evolution reaction (OER), CoOx/FeOx/CNTs showed excellent electrocatalytic performance in terms of catalytic activity and stability. The overpotential of CoOx/FeOx/CNTs in OER was only 308 mV at 10 mA cm(-2), which was lower than those of the pure oxides: CoOx/CNTs (392 mV) and FeOx/CNTs (406 mV). The as-prepared electrocatalyst also displayed better stability than the reference RuO(2)material, with almost no attenuation of current density in contrast to the 10% loss seen with RuO2. The OER performance of CoOx/FeOx/CNTs was superior to those of its oxide components due to the formation of heterojunction, which led to a smoother reaction path and a lower overpotential for OER compared to pure oxides, as supported by the density-functional theory (DFT) calculations. These results provide a new direction for the preparation of electrocatalysts for metal-air batteries and water splitting reactions.
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