期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 7, 期 5, 页码 4784-4791出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b05044
关键词
amorphous material; bifunctional electrocatalyst; layered double hydroxide; nanowire arrays; water splitting
资金
- NSFC Major International (Regional) Joint Research Project NSFC-SNSF [51661135023]
- NSFC [21673091]
- 973 Program of China [2014CB643506]
- Fundamental Research Funds for the Central Universities [HUST: 2016YXMS031]
- Director Fund of the WNLO
- Open Funds of the State Key Laboratory of Electroanalytical Chemistry [SKLEAC201607]
Overall water splitting is an attractive technology to produce clean hydrogen and oxygen. In this study, we constructed amorphous NixCoy layered double hydroxide (LDH) hybridized with three-dimensional NiCo2O4 to fabricate a core-shell nanowire array on Ni foam (NiCo2O4@Ni Coy LDH/NF) as a highly efficient electrocatalyst for overall water electrolysis. By tuning the Ni/Co molar ratio in NixCoy LDH, extremely low overpotentials of 193 mV for oxygen evolution reaction (OER) and 115 mV for hydrogen evolution reaction (HER) at a current density of 10 mA cm(-2) can be achieved for the NiCo2O4@Ni0.796Co LDH/NF. Detailed investigations verify that the hybrid structure can increase intrinsic activity of the NiCo2O4@Ni0.796Co LDH/NF and enhance the charge-transfer rate. Moreover, a strong electronic interaction between the heterogeneous elements Ni and Co at the interface of the NiCo2O4 and NixCoy LDH might ultimately influence the catalytic performance.
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