title: Surface Electrochemical Modification of a Nickel Substrate to Prepare a NiFe-based Electrode for Water Oxidation.
abstract: The slow kinetics of water oxidation greatly jeopardizes the efficiency of water electrolysis for H2production. Developing highly active water oxidation electrodes with affordable fabrication costs is thus of great importance. Herein, a NiIIFeIIIsurface 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 NiIIFeIIIcatalyst film, FeIIIwas incorporated uniformly through controlled oxidation of FeIIcations on the electrode surface. The catalytically active NiIIoriginated 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-2are 276, 290, and 329 mV, respectively.
authors.affiliation: School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710119, P.R. China.
authors.forename: Dingyi
authors.initials: D
authors.lastname: Guo
authors.affiliation: School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710119, P.R. China.
authors.forename: Jing
authors.initials: J
authors.lastname: Qi
authors.affiliation: School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710119, P.R. China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.affiliation: School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710119, P.R. China.|Department of Chemistry, Renmin University of China, Beijing, 100872, P.R. China.
authors.forename: Rui
authors.initials: R
authors.lastname: Cao
mesh_terms: D004563:Electrochemistry; D004566:Electrodes; D007501:Iron / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D010084:Oxidation-Reduction; D013499:Surface Properties; D013696:Temperature; D014867:Water / Q000737:chemistry*
chemical_list: D014867:Water; D009532:Nickel; D007501:Iron
keywords: electrocatalysis; iron; nickel; oxygen evolution; water oxidation