In:
Advanced Energy Materials, Wiley, Vol. 12, No. 22 ( 2022-06)
Abstract:
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@MoO 3− x composite nanoarrays is reported by a moderate reduction strategy, combining Ni/NiO nanoparticles (≈20 nm) with amorphous MoO 3− x nanoarrays. The Ni/NiO@MoO 3− 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 η 10 overpotential of 7 mV as well as Tafel slope of 34 mV dec −1 . More significantly, the Ni/NiO@MoO 3− 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.
Type of Medium:
Online Resource
ISSN:
1614-6832
,
1614-6840
DOI:
10.1002/aenm.202200001
Language:
English
Publisher:
Wiley
Publication Date:
2022
detail.hit.zdb_id:
2594556-7
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