期刊
ACS CATALYSIS
卷 8, 期 6, 页码 5382-+出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.8b01332
关键词
cation exchange; Ni(OH)(2) nanosheets; wettability; oxygen evolution reaction; electrocatalysis
资金
- Australian Research Council (ARC) DECRA Grant [DE160100596]
- ARC Discovery Project [DP160102627]
- AIIM-MANA Joint Seed Grant
- AIIM FOR GOLD Grant
- National Natural Science Foundation of China [11404314]
- Anhui Provincial Natural Science Foundation [1708085MA06]
Highly active, durable, and inexpensive nanostructured catalysts are crucial for achieving efficient and economical electrochemical water splitting. However, developing efficient approaches to further improve the catalytic ability of the well-defined nanostructured catalysts is still a big challenge. Herein, we report a facile and universal cation-exchange process for synthesizing Fe-doped Ni(OH)(2) and Co(OH)(2) nanosheets with enriched active sites toward enhanced oxygen evolution reaction (OER). In comparison with typical NiFe layered double hydroxide (LDH) nanosteets prepared by the conventional one-pot method, Fe-doped Ni(OH)(2) nanosheets evolving from Ni(OH)(2) via an Fe3+/ Ni2+ cation-exchange process possess nanoporous surfaces with abundant defects. Accordingly, Fe-doped Ni(OH)(2) nanosheets exhibit higher electrochemical active surface area (ECSA) and improved surface wettability in comparison to NiFe LDH nanosheets and deliver significantly enhanced catalytic activity over NiFe LDH. Specifically, a low overpotential of only 245 mV is required to reach a current density of 10 mA cm(-2) for Ni0.83Fe0.17(OH)(2) nanosheets with a low Tafel slope of 61 mV dec(-1), which is greatly decreased in comparison with those of NiFe LDH (310 mV and 78 mV dec-1). Additionally, this cation exchange process is successfully extended to prepare Fe-doped Co(OH)(2) nanosheets with improved catalytic activity for oxygen evolution. The results suggest that this cation-exchange process should have great potential in the rational design of defect enriched catalysts toward high-performance electrocatalysis.
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