title: NiSe@NiOOH Core-Shell Hyacinth-like Nanostructures on Nickel Foam Synthesized by in Situ Electrochemical Oxidation as an Efficient Electrocatalyst for the Oxygen Evolution Reaction.
abstract: NiSe@NiOOH core-shell hyacinth-like nanostructures supported on nickel foam (NF) have been successfully synthesized by a facile solvothermal selenization and subsequent in situ electrochemical oxidation (ISEO). First, the unique NiSe/NF nanopillar arrays were prepared in N,N-dimethylformamide (DMF) as a precursor template that can provide a large surface area, excellent conductivity, and robust support. Next, amorphous NiOOH covering the surface of NiSe nanopillars was fabricated by ISEO, as confirmed by XPS andEDX spectroscopy. SEM images revealed the hyacinth-like morphology of NiSe@NiOOH/NF with NiOOH as the shell and NiSe as the core. The electrochemical performance of NiSe@NiOOH/NF for the oxygen evolution reaction (OER) was investigated. NiSe@NiOOH/NF demonstrates an obviously enhanced OER activity with much lower overpotential of 332 mV at 50 mA cm(-2) compared to other Ni-based electrocatalysts. The low charge-transfer resistance (Rct), large electrochemical double-layer capacitance (Cdl) of electrochemically active surface areas (ECSAs), and excellent long-term stability of NiSe@NiOOH/NF confirm the enhancement of its electrochemical performance for the OER, which can be ascribed to the large amount of active sites derived from the amorphous NiOOH shell and the good conductivity and stability derived from the NiSe core. In addition, the synergistic effect between the NiSe core and NiOOH shell could serve for a highly efficient OER electrocatalyst.
authors.affiliation: State Key Laboratory of Heavy Oil Processing and ‡College of Science, China University of Petroleum (East China) , Qingdao 266580, P.R. China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Li
authors.affiliation: State Key Laboratory of Heavy Oil Processing and ‡College of Science, China University of Petroleum (East China) , Qingdao 266580, P.R. China.
authors.forename: Guan-Qun
authors.initials: GQ
authors.lastname: Han
authors.affiliation: State Key Laboratory of Heavy Oil Processing and ‡College of Science, China University of Petroleum (East China) , Qingdao 266580, P.R. China.
authors.forename: Yan-Ru
authors.initials: YR
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Heavy Oil Processing and ‡College of Science, China University of Petroleum (East China) , Qingdao 266580, P.R. China.
authors.forename: Bin
authors.initials: B
authors.lastname: Dong
authors.affiliation: State Key Laboratory of Heavy Oil Processing and ‡College of Science, China University of Petroleum (East China) , Qingdao 266580, P.R. China.
authors.forename: Wen-Hui
authors.initials: WH
authors.lastname: Hu
authors.affiliation: State Key Laboratory of Heavy Oil Processing and ‡College of Science, China University of Petroleum (East China) , Qingdao 266580, P.R. China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Shang
authors.affiliation: State Key Laboratory of Heavy Oil Processing and ‡College of Science, China University of Petroleum (East China) , Qingdao 266580, P.R. China.
authors.forename: Yong-Ming
authors.initials: YM
authors.lastname: Chai
authors.affiliation: State Key Laboratory of Heavy Oil Processing and ‡College of Science, China University of Petroleum (East China) , Qingdao 266580, P.R. China.
authors.forename: Chen-Guang
authors.initials: CG
authors.lastname: Liu
keywords: NiOOH; NiSe; core−shell structure; oxidation; oxygen evolution reaction