期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 49, 页码 33697-33703出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b12100
关键词
oxygen evolution reaction; layered double hydroxide; electrocatalysts; hollow microsphere; non-precious-metal hydroxide
资金
- National Natural Science Foundation of China (NSFC)
- 973 Program [2014CB932102]
- Fundamental Research Funds for the Central Universities [buctrc201506, YS 1406]
- China National Funds for Distinguished Young Scientists of the NSFC
The exploitation of highly efficiency and low-cost electrocatalysts toward oxygen evolution reaction (OER) is a meaningful route in renewable energy technologies including solar fuel and water splitting. Herein, NiFe-layered double hydroxide (NiFe-LDH) hollow microsphere (HMS) was designed and synthesized via a one-step in situ growth method by using SiO2 as a sacrificial template. Benefiting from the unique architecture, NiFe-LDH HMS shows highly efficient OER electrocatalytic activity with a preferable current density (71.69 mA cm(-2) at eta = 300 mV) and a small onset overpotential (239 mV at 10 mA cm(-2)), which outperforms the 20 wt % commercial Ir/C catalyst. Moreover, it exhibits a remarkably low Tafel slope (53 mV dec(-1)) as well as a satisfactory long-time stability. Electrochemical studies reveal that this hierarchical structure facilitates a full exposure of active sites and facile ion transport kinetics, accounting for the excellent performance. It is expected that the NiFe-LDH microsphere material can serve as a promising non-noble-metal-based electrocatalyst toward water oxidation reaction.
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