Electrocatalytic Water Splitting over Nickel Iron Hydroxide-cobalt Phosphide Composite Electrode
NiFeOH/CoP/NF composite electrode was fabricated by constructing a metal hydroxide layer on the surface of cobalt phosphide via hydrothermal,phosphating,and electrodeposition methods.The electrolytic water splitting to hydrogen performance by as-prepared electrode was investigated in 1.0 mol/L KOH medium.NiFeOH/CoP/NF composite electrode exhibited excellent water electrolysis performance,and the required overpotentials for HER and OER at 100 mA/cm2 current density were 141 and 372 mV,respectively.When NiFeOH/CoP/NF electrode served as both cathode and anode for water splitting,only 1.61 V voltage was required to reach current density of 10 mA/cm2.Because NiFeOH protection layer enhanced the electrocatalytic activity and stability of CoP for water splitting,NiFeOH/CoP/NF composite electrode exhibited high stability during the galvanostatic electrolysis in the HER and OER,and its activity could maintain 60000 s without significant performance degradation.The photovoltaic-electrolytic water cell constructed with two NiFeOH/CoP/NF electrodes and GaAs solar cell showed 18.0%efficiency of solar to hydrogen under 100 mW/cm2 simulated solar irradiation and worked stably for 200 h.
cobalt phosphidemetal hydroxide protection layerelectrocatalytic water splittingstability
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