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Self‐Supportive NiFe hydroxide with High Electrocatalytic Activity for Oxygen and Hydrogen Evolution Reaction
Author(s) -
Guo Lulu,
Pan Guangxing,
Du Yue,
Chen Shouhui,
Wang Li
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201804004
Subject(s) - overpotential , electrochemistry , catalysis , hydroxide , materials science , oxygen evolution , cathode , water splitting , anode , redox , raman spectroscopy , inorganic chemistry , chemical engineering , electrode , chemistry , metallurgy , biochemistry , physics , photocatalysis , optics , engineering
Here, a facile method to prepare low‐cost self‐supportive NiFe hydroxide on etching galvanized sheet iron (EGSI) (Fe x Ni y OOH/EGSI) for electrochemical water splitting was proposed for the first time. The EGSI was firstly treated in Fe 2+ , Ni 2+ and urea mixture to obtain Fe x Ni y OH/EGSI and then were further transformed into Fe x Ni y OOH/EGSI by the electrooxidation in NaOH solution. SEM results indicated various morphologies including nanoflowers, nanosheets and cubes could be obtained depending on the ratio of Fe 2+ and Ni 2+ . Raman spectra, XRD and electrochemical results indicated that the NiOOH was produced in electrooxidation process, which improved its catalytic activity of OER remarkably. Besides, modest Fe‐doping could make it achieve better catalytic activity because Fe‐doping could alter the redox properties of NiFe hydroxide to result in low overpotential. As a result, the Fe x Ni y OOH/EGSI presented good OER and HER performances. The optimum Fe 1.5 Ni 0.5 OOH/EGSI as cathode and Fe 0.2 Ni 1.8 OOH/EGSI as anode were applied for water splitting, achieving a current density of 10 mA cm ‐2 at 1.69 V, indicating that it could work at a lower potential.