Issue 45, 2016, Issue in Progress

Co nanoparticles embedded in a 3D CoO matrix for electrocatalytic hydrogen evolution

Abstract

Earth-abundant and highly efficient electrocatalysts for the hydrogen evolution reaction (HER) are desired for hydrogen production from water-splitting. Here, Co nanoparticles were embedded in the 3D CoO matrix via a template-free method, including cobalt hydroxy-carbonate nanowire arrays grown on Ni foam and the following non-contact Al-reduction process. The as-prepared 3D hierarchical structured Co/CoO nanowires possess good charge transfer and mass transport properties, and a synergistic effect at the Co/CoO interface can hugely facilitate the HER kinetics. A suitable balance between Co and CoO in the catalyst is crucial for high catalytic activity. And the optimal Co/CoO array exhibited outstanding HER activities in 1 M NaOH, achieving nearly zero onset potential, and a current density of 100 mA cm−2 with a small overpotential of 167 mV. They also showed good long-term stabilities. This hybrid Co/CoO nanowire array is a promising material for large-scale hydrogen production from water-splitting.

Graphical abstract: Co nanoparticles embedded in a 3D CoO matrix for electrocatalytic hydrogen evolution

Supplementary files

Article information

Article type
Paper
Submitted
22 Mar 2016
Accepted
13 Apr 2016
First published
13 Apr 2016

RSC Adv., 2016,6, 38515-38520

Co nanoparticles embedded in a 3D CoO matrix for electrocatalytic hydrogen evolution

X. Liu, C. Dong, W. Dong, X. Wang, X. Yuan and F. Huang, RSC Adv., 2016, 6, 38515 DOI: 10.1039/C6RA07538J

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