Journal
ADVANCED ENERGY MATERIALS
Volume 12, Issue 22, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202200001
Keywords
electrocatalysts; high current density; hydrogen evolution; hydrophilicity; Ni composites
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Funding
- National Key R&D Program of China [2018YFA0209401, 2018YFE0201701]
- National Natural Science Foundation of China [22088101, U21A20329, 21733003, 21975050]
- Science and Technology Commission of Shanghai Municipality [19JC1410700]
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In this study, Ni/NiO@MoO3-x composite nanoarrays were synthesized through a moderate reduction strategy, which exhibited ultrahigh alkaline HER activity and higher stability compared to the traditional Pt/C catalyst.
High current density hydrogen evolution reaction (HER) in alkaline water electrolysis plays crucial role in renewable and sustainable energy systems, while posing a great challenge to the highly-efficient electrocatalysts. Here, the synthesis of Ni/NiO@MoO3-x composite nanoarrays is reported by a moderate reduction strategy, combining Ni/NiO nanoparticles (approximate to 20 nm) with amorphous MoO3-x nanoarrays. The Ni/NiO@MoO3-x composite nanoarrays possess enhanced hydrophilicity, optimize reaction energy barriers, accelerate reactant diffusion/bubble detachment, and therefore display an ultrahigh alkaline HER activity with a low eta(10) overpotential of 7 mV as well as Tafel slope of 34 mV dec(-1). More significantly, the Ni/NiO@MoO3-x nanoarrays only demand low overpotentials of 75 and 112 mV to deliver 100 and 200 mA cm(-2) hydrogen production current, and can steadily work at 100 mA cm(-2) for 40 h, which is more efficient and stable than the Pt/C catalyst.
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