期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 4, 期 29, 页码 11292-11298出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta04052g
关键词
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资金
- National Natural Science Foundation of China [61376056, 51125006, 91122034, 51121064, 51222212]
- Science and Technology Commission of Shanghai [13JC1405700, 14520722000]
The design of a high performance, stable and cost-effective electrocatalyst for oxygen evolution is crucial for H-2 production from electrochemical water splitting. Here, as a dual-functional-site catalyst, cobalt-chromium layered double hydroxide (CoCr LDH) nanosheets are designed and synthesized, where Co2+ is the catalytically active site and Cr3+ is the charge transfer site. OER investigation of CoCr LDH is conducted for the first time. The CoCr LDH nanosheets have a high specific surface area of 151.78 m(2) g(-1) and exhibit outstanding OER activities, among the best of Co-based candidates. Accordingly, our catalyst affords a low onset potential of 1.47 V (vs. reversible hydrogen electrode, RHE) and a stable current density of 22.8 mA cm(-2) at 1.61 V (vs. RHE) for 12 h. The Tafel slope of CoCr LDH is 81.0 mV dec(-1), smaller than that of state-of-the-art RuO2 (90.1 mV dec(-1)). Therefore, the CoCr LDH nanosheets are promising OER catalysts.
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