Journal
NANO ENERGY
Volume 78, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2020.105375
Keywords
Nickel-molybdenum nitride; Hydrogen evolution; Underwater superaerophobic; Electrocatalysis; Neutral media
Categories
Funding
- National Key Projects for Fundamental Research and Development of China [2017YFA0206904, 2017YFA0206900, 2018YFB1502002]
- National Natural Science Foundation of China [51825205, 51772305, 21871279, 21802154, 21902168]
- Beijing Natural Science Foundation [2191002, 2182078, 2194089]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB17000000]
- Royal Society-Newton Advanced Fellowship [NA170422]
- International Partnership Program of Chinese Academy of Sciences [GJHZ1819, GJHZ201974]
- K. C. Wong Education Foundation
- Youth Innovation Promotion Association of the CAS
- Energy Education Trust of New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology
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Electrochemical water splitting into hydrogen and oxygen in neutral electrolytes has great significance for future energy supply security, potentially offering a pathway for H-2 generation from seawater. However, the electrocatalytic hydrogen evolution reaction (HER) generally occurs at low rates in neutral solutions due to the low proton concentration in such media. Herein, we fabricated a novel HER catalyst capable of efficient H-2 evolution in water at neutral pH, comprising a nickel-molybdenum nitride nanowire array modified with metallic Ni nanoparticles (Ni/NiMoN). The entire Ni/NiMoN array was supported on a Cu foam. The Ni nanoparticles promoted the dissociation of adsorbed water to enhance the supply of protons in the neutral electrolyte, whilst the nanowire array imparted the electrode surface with underwater superaerophobic properties, thus allowing H-2 gas bubbles to detach from the electrode in a facile manner. On the basis of the synergies realized between the different electrode components, the Ni/NiMoN nanowire array electrode offered exceptional HER performance, with an overpotential of only 37 mV at a current density of 10 mA cm(-2) in a neutral electrolyte. Results guide the development of next-generation earth-abundant element electrocatalysts for HER in neutral media.
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