Journal
APPLIED SURFACE SCIENCE
Volume 569, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2021.151016
Keywords
Transition-metal phosphide; NiCo2O4; Atomic layer deposition; Oxygen evolution reaction; Hydrogen evolution reaction; Water splitting
Categories
Funding
- National Natural Science Foundation of China [21975229, 22075256]
- Natural Science Foundation of Zhejiang Province [LY19E020001, LY19B060003]
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The study presents a bifunctional electrocatalyst based on hierarchical FePx-NiCo2O4 nanoneedle arrays, which shows superior performance in water electrolysis. The electrode exhibits low overpotentials and voltage, outperforming commercial electrocatalysts, paving a new way for developing transition metal oxides-based overall water splitting electrocatalysts.
A recent approach for hydrogen production has been electrolysis of water using stable and efficient bifunctional electrocatalysts. Herein, we report a hierarchical FePx-NiCo2O4 nanoneedle arrays with core-shell structure grown on nickel foam (FeP-NCO@NF), which acts as a superior bifunctional electrocatalyst for water electrolysis. Benefiting from the synergetic effects between crystalline NiCo2O4 and amorphous FePx, the binder-free FeP-NCO@NF electrode delivers an oxygen hydrogen production with an overpotential of 220 mV for the oxygen evolution reaction and 82 mV for the hydrogen evolution reaction at 10 mA cm(-2) in 1 M KOH electrolyte. In addition, the overall water splitting based on FeP-NCO@NF as anode/cathode can be performed with a low voltage of 1.523 V to deliver 10 mA cm(-2), which is 14 mV lower than that for the commercial Pt/C-IrO2 electrocatalyst. The developed materials combine the catalytic activity with working stability, which paves a new way for exploring transition metal oxides based overall water splitting electrocatalysts.
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