Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 4, Pages 4247-4254Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b05953
Keywords
Nickel-iron layered double hydroxide; Oxygen-enriched nanosheets; Water-plasma; Electrocatalysis; Oxygen evolution reaction
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Funding
- Foundation of Hubei Key Laboratory for Processing and Application of Catalytic Materials [201721203]
- National Natural Science Foundation of China [51702284, 21878270]
- Zhejiang Provincial Natural Science Foundation of China [LR19B060002]
- Startup Foundation for Hundred Talent Program of Zhejiang University [112100-193820101/001/022]
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Developing nonprecious and effective catalysts for electrochemical oxygen evolution reaction (OER) remains a critical challenge among energy conversion technologies. Herein, we developed a novel oxygen-enriched nickel-iron layered double hydroxide (NiFe-LDH) nanosheets electrocatalyst prepared by water-plasma assisted synthesis. The water-plasma engraved oxygen-enriched NiFe-LDH nanosheets possessed a large petal structure of similar to 3 mu m lateral size with plentiful pores distributed on each flak with 10 nm thicknesses, and a large BET surface area (151 m(2) g(-1)). Profiting by enriched oxygen atoms and fast charge transfer, the oxygen-enriched NiFe-LDH nanosheets displayed a favorable electrocatalytic performance toward OER with a low Tafel slope of 74 mV dec(-1) and an overpotential at 10 mA cm(-2) for 310 mV in 1.0 M KOH. Such low overpotential was much smaller than initial NiFe-LDH nanosheets (360 mV), and even superior to commercial Ir/C electrocatalyst (370 mV). Sustainable and highly active full water splitting enabled by oxygen-enriched NiFe-LDH nanosheets could be further driven by solar cell or two alkali batteries.
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