Premium
NiFe/(Ni,Fe) 3 S 2 Core/Shell Nanowire Arrays as Outstanding Catalysts for Electrolytic Water Splitting at High Current Densities
Author(s) -
Hsieh ChengTing,
Chuah XuiFang,
Huang ChunLung,
Lin HaoWei,
Chen YuAn,
Lu ShihYuan
Publication year - 2019
Publication title -
small methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.66
H-Index - 46
ISSN - 2366-9608
DOI - 10.1002/smtd.201900234
Subject(s) - nanowire , materials science , electrode , anode , water splitting , catalysis , electrolyte , cathode , oxygen evolution , current density , chemical engineering , nanotechnology , oxide , electrochemistry , analytical chemistry (journal) , chemistry , metallurgy , biochemistry , photocatalysis , engineering , physics , quantum mechanics , chromatography
Abstract NiFe/(Ni,Fe) 3 S 2 core/shell nanowire arrays, fabricated with an anodic aluminum oxide membrane templated electrodeposition followed by sulfur ion exchange, are developed as an outstanding catalyst for electrolytic water splitting. Ni nanowire arrays achieve low overpotentials of 112 and 347 mV for the hydrogen evolution reaction at current densities of 10 and 400 mA cm −2 , respectively, whereas ultralow overpotentials of 224 and 305 mV for the oxygen evolution reaction at current densities of 10 and 400 mA cm −2 , respectively, are achieved by NiFe/(Ni,Fe) 3 S 2 core/shell nanowire arrays. The pairing of the Ni nanowire array electrode as the cathode and the NiFe/(Ni,Fe) 3 S 2 core/shell nanowire array electrode as the anode, delivers current densities of 10 and 400 mA cm −2 at ultralow cell voltages of 1.56 and 1.9 V, respectively, for the overall water splitting. The stability of the electrodes is also excellent, exhibiting only minor chronoamperometric decay after 24 h continuous operation at 400 mA cm −2 . The nanowire array‐based electrodes, offering extended reaction surface areas and 1D guided charge transport and mass transfer, prove to be a promising new catalyst architecture design for electrocatalytic processes.