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Ultrafast Formation of Amorphous Bimetallic Hydroxide Films on 3D Conductive Sulfide Nanoarrays for Large‐Current‐Density Oxygen Evolution Electrocatalysis
Author(s) -
Zou Xu,
Liu Yipu,
Li GuoDong,
Wu Yuanyuan,
Liu DaPeng,
Li Wang,
Li HaiWen,
Wang Dejun,
Zhang Yu,
Zou Xiaoxin
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201700404
Subject(s) - electrocatalyst , oxygen evolution , bimetallic strip , materials science , nanosheet , nickel sulfide , catalysis , hydroxide , amorphous solid , nanomaterials , sulfide , chemical engineering , water splitting , nickel , noble metal , inorganic chemistry , nanotechnology , electrochemistry , metal , electrode , metallurgy , chemistry , crystallography , organic chemistry , engineering , photocatalysis
Developing nonprecious oxygen evolution electrocatalysts that can work well at large current densities is of primary importance in a viable water‐splitting technology. Herein, a facile ultrafast (5 s) synthetic approach is reported that produces a novel, efficient, non‐noble metal oxygen‐evolution nano‐electrocatalyst that is composed of amorphous Ni–Fe bimetallic hydroxide film‐coated, nickel foam (NF)‐supported, Ni 3 S 2 nanosheet arrays. The composite nanomaterial (denoted as Ni‐Fe‐OH@Ni 3 S 2 /NF) shows highly efficient electrocatalytic activity toward oxygen evolution reaction (OER) at large current densities, even in the order of 1000 mA cm −2 . Ni‐Fe‐OH@Ni 3 S 2 /NF also gives an excellent catalytic stability toward OER both in 1 m KOH solution and in 30 wt% KOH solution. Further experimental results indicate that the effective integration of high catalytic reactivity, high structural stability, and high electronic conductivity into a single material system makes Ni‐Fe‐OH@Ni 3 S 2 /NF a remarkable catalytic ability for OER at large current densities.