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Synergetic effect of h-BN shells and subsurface B in CoBx@h-BN nanocatalysts for enhanced oxygen evolution reactions

Abstract

Boron-containing cobalt (Co-B) nanoparticles (NPs) synthesized by borohydride reduction process were subjected to ammonization. Part of B species segregate onto particle surfaces to form ultrathin h-BN shells which stabilize highly dispersed Co NPs under harsh conditions and the left B atoms interact strongly with Co atoms inside NPs. The formed CoBx@h-BN core-shell nanocatalysts exhibit an overpotential of 290 mV at current density of 10 mA·cm−2 which are among the most active catalysts for oxygen evolution reaction (OER) and present 150 h OER stability. The improved OER performance has been attributed to the synergetic role of confinement effect of h-BN shells and activation effect of subsurface B atoms. This work suggests a simple synthetic route to prepare highly active and stable metal nanocatalysts without using any surfactants and supports.

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Publication details

The article was received on 12 Mar 2018, accepted on 08 May 2018 and first published on 10 May 2018


Article type: Communication
DOI: 10.1039/C8TA02312C
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Synergetic effect of h-BN shells and subsurface B in CoBx@h-BN nanocatalysts for enhanced oxygen evolution reactions

    S. Chen, Y. Li, Z. Zhang, Q. Fu and X. Bao, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA02312C

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