title: Highly Active Three-Dimensional NiFe/Cu2O Nanowires/Cu Foam Electrode for Water Oxidation.
abstract: Water splitting is of paramount importance for exploiting renewable energy-conversion and -storage systems, but is greatly hindered by the kinetically sluggish oxygen evolution reaction (OER). In this work, a three-dimensional, highly efficient, and durable NiFe/Cu2O nanowires/Cu foam anode (NiFe/Cu2O NWs/CF) for water oxidation in 1.0 m KOH was developed. The obtained electrode exhibited a current density of 10 mA cm-2at a uniquely low overpotential of η=215 mV. The average specific current density (js) was estimated, on the basis of the electrocatalytically active surface area, to be 0.163 mA cm-2at η=310 mV. The electrode also displayed a low Tafel slope of 42 mV decade-1. Moreover, the NiFe/Cu2O NWs/CF electrode could maintain a steady current density of 100 mA cm-2for 50 h at an overpotential of η=260 mV. The outstanding electrochemical performance of the electrode for the OER was attributed to the high conductivity of the Cu foam and the specific structure of the electrode with a large interfacial area.
authors.affiliation: State Key Laboratory of Fine Chemicals, Institute of Artificial Photosynthesis, DUT-KTH Joint Education and Research Center on Molecular Devices, Dalian University of Technology, DUT, Dalian, 116024, P.R. China.
authors.forename: Hu
authors.initials: H
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Fine Chemicals, Institute of Artificial Photosynthesis, DUT-KTH Joint Education and Research Center on Molecular Devices, Dalian University of Technology, DUT, Dalian, 116024, P.R. China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Gao
authors.affiliation: State Key Laboratory of Fine Chemicals, Institute of Artificial Photosynthesis, DUT-KTH Joint Education and Research Center on Molecular Devices, Dalian University of Technology, DUT, Dalian, 116024, P.R. China.|Department of Chemistry, School of Chemical Science and Engineering, KTH Royal Institute of Technology, 10044, Stockholm, Sweden.
authors.forename: Licheng
authors.initials: L
authors.lastname: Sun
mesh_terms: D002384:Catalysis; D003300:Copper / Q000737:chemistry*; D004553:Electric Conductivity; D004563:Electrochemistry; D004566:Electrodes; D007501:Iron / Q000737:chemistry*; D053770:Nanowires / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D010084:Oxidation-Reduction; D014867:Water / Q000737:chemistry*
chemical_list: D014867:Water; C030616:ferronickel; D003300:Copper; D009532:Nickel; D007501:Iron; C000520:cuprous oxide
keywords: copper; electrocatalysis; electrochemistry; nanowires; oxidation; water chemistry