Premium
Surface Electrochemical Modification of a Nickel Substrate to Prepare a NiFe‐based Electrode for Water Oxidation
Author(s) -
Guo Dingyi,
Qi Jing,
Zhang Wei,
Cao Rui
Publication year - 2017
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201601151
Subject(s) - electrochemistry , nickel , electrode , electrolysis of water , electrolysis , catalysis , water splitting , substrate (aquarium) , inorganic chemistry , electrocatalyst , materials science , chemical engineering , chemistry , metallurgy , organic chemistry , photocatalysis , oceanography , electrolyte , engineering , geology
The slow kinetics of water oxidation greatly jeopardizes the efficiency of water electrolysis for H 2 production. Developing highly active water oxidation electrodes with affordable fabrication costs is thus of great importance. Herein, a Ni II Fe III surface species on Ni metal substrate was generated by electrochemical modification of Ni in a ferrous solution by a fast, simple, and cost‐effective procedure. In the prepared Ni II Fe III catalyst film, Fe III was incorporated uniformly through controlled oxidation of Fe II cations on the electrode surface. The catalytically active Ni II originated from the Ni foam substrate, which ensured the close contact between the catalyst and the support toward improved charge‐transfer efficiency. The as‐prepared electrode exhibited high activity and long‐term stability for electrocatalytic water oxidation. The overpotentials required to reach water oxidation current densities of 50, 100, and 500 mA cm −2 are 276, 290, and 329 mV, respectively.