期刊
ACS APPLIED ENERGY MATERIALS
卷 2, 期 5, 页码 3927-3935出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b00785
关键词
FeOOH; electrodeposition; electrophoretic deposition; electrocatalysis; oxygen evolution reaction
资金
- National Natural Science Foundation of China [21471039, 21571043, 21671047, 21871065]
- Fundamental Research Funds for the Central Universities [PIRS of HIT A201502, 201223]
- China Postdoctoral Science Foundation [2014M560253]
- Postdoctoral Scientific Research Fund of Heilongjiang Province [LBH-Q14062, LBH-Z14076]
- Natural Science Foundation of Heilongjiang Province [B2015001]
As the oxygen evolution reaction (OER) is the bottleneck of electrocatalytic water splitting, it is highly imperative to develop OER catalysts with excellent activity and stability. Herein, we demonstrate a stepwise electrochemical construction of crystalline alpha-FeOOH/beta-Ni(OH)(2) composite structure supported on nickel foam (FeOOH/Ni(OH)(2)/NF) through cathodic electrodeposition of beta-Ni(OH)(2) nanosheets followed by electrophoretic deposition of alpha-FeOOH nanoparticles. Taking advantange of the synergistic effect of Ni and Fe as well as the formed interface, this composite structure is highly active for the OER process in alkaline media (1 M KOH), providing a very low overpotential of 207 mV versus the reversible hydrogen electrode (RHE) at a geometric catalytic current density of 40 mA cm(-2) and a Tafel slope of 70 mV dec(-1), which is superior to most reported (oxy)hydroxide-based OER electrocatalysts. In combination with density functional theory (DFT) calculations, it is verified that the synergistic interface effect between the real active sites NiOOH and FeOOH can facilitate the OER process. We believe this stepwise electrochemical technique for constructing Ni-Fe (oxy)hydroxide composites can provide new insights into the design and synthesis of highly efficient electrocatalysts for energy conversion applications.
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