Open AccessHierarchical FeOOH@NiCo2S4 Core-Shell Heterostructure Supported on Nickel Foam as an Efficient Electrocatalyst for Oxygen Evolution Reaction
Author(s) -
Huixi Li,
Wen Zhao,
Pengcheng Chai,
Yifan Zhang,
Xinhua Zhu,
Shengping Wang
Publication year - 2022
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/ac5ff0
Subject(s) - tafel equation , overpotential , electrocatalyst , oxygen evolution , materials science , nickel , chemical engineering , catalysis , water splitting , amorphous solid , heterojunction , electrolyte , nanotechnology , chemistry , electrode , crystallography , electrochemistry , metallurgy , photocatalysis , optoelectronics , engineering , biochemistry
Amorphous FeOOH nanosheets were electrodeposited onto nickel foam (NF)-supported NiCo 2 S 4 nanotube arrays to form a three-dimensional FeOOH@NiCo 2 S 4 /NF core–shell heterostructure, which is a bifunctional electrocatalyst for overall water splitting (OWS). FeOOH@NiCo 2 S 4 /NF pre-catalyst showed a good electrocatalytic activity and stability for the oxygen evolution reaction in a 1 M KOH solution, with an overpotential of 228 mV at 10 mA cm −2 , a Tafel slope of 44.03 mV dec −1 and a durability of more than 50 h. The overpotential of the hydrogen evolution reaction was 112 mV at 10 mA cm −2 . The OWS performance was very good because it only required a voltage of 1.56 V at 10 mA cm −2 . The 3D core–shell structure with a large electrolyte contact interface, the good electronic conductivity, the large surface exposure of active sites by the NiCo 2 S 4 nanotube arrays, and the strong electron interaction at the heterogeneous interface between FeOOH and NiCo 2 S 4 are the key factors for the excellent performance.