Journal of Materials Science, Vol.54, No.10, 7692-7701, 2019
Fabrication of dispersive alpha-Co(OH)(2) nanosheets on graphene nanoribbons for boosting their oxygen evolution performance
Nanostructured alpha-Co(OH)(2) materials are promising noble-metal-free electro-catalysts for oxygen evolution reaction (OER), but their performance is severally restrained by their poor conductivity. Combination of alpha-Co(OH)(2) and carbon nanotubes (CNTs) can improve their conductivity, but it is difficult to build sufficient interface contact between them due to the mismatched hydrophobicity. Herein, we demonstrate a facile method to in situ grow alpha-Co(OH)(2) nanosheets (NSs) on graphene nanoribbons (GNRs), an intriguing belt-like conductive material after oxidative unzipping of CNTs. Owing to the rich of functional groups, the GNRs can be utilized as substrate in solution to prepare dispersive alpha-Co(OH)(2) nanosheets on their surface. The developed alpha-Co(OH)(2) NSs are well contact with the conductive GNRs substrate and offer sufficient active surface area, showing obviously better OER performance than the alpha-Co(OH)(2) and CNTs/Co(OH)(2) prepared under the same condition. The composite electrocatalysts have been characterized by various apparatuses, and their OER activities are explored in detail.