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Research Article

Millisecond synthesis of CoS nanoparticles for highly efficient overall water splitting

Yanan Chen1,§, Shaomao Xu1,§, Shuze Zhu2,§, Rohit Jiji Jacob3, Glenn Pastel1, Yanbin Wang1, Yiju Li1, Jiaqi Dai1, Fengjuan Chen1, Hua Xie1, Boyang Liu1, Yonggang Yao1, Lourdes G. Salamanca-Riba1, Michael R. Zachariah3, Teng Li2, Liangbing Hu1( )
Department of Materials Science and EngineeringUniversity of Maryland, College Park, College ParkMaryland20742USA
Department of Mechanical EngineeringUniversity of Maryland, College Park, College ParkMaryland20742USA
Department of Chemical and Biomolecular Engineering and Chemistry and BiochemistryUniversity of Maryland, College Park, College ParkMaryland20742USA

§ Yanan Chen, Shaomao Xu, and Shuze Zhu contributed equally to this work.

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Abstract

High performance and low-cost electrocatalysts for overall water splitting, i.e., catalyzing hydrogen and oxygen evolution reactions with the same material, are of great importance for large-scale, renewable energy conversion processes. Here, we report an ultrafast (~ 7 ms) synthesis technique for transition metal chalcogenide nanoparticles assisted by high temperature treatment. As a proof of concept, we demonstrate that cobalt sulfide (~ 20 nm in diameter)@ few-layer graphene (~ 2 nm in thickness) core-shell nanoparticles embedded in RGO nanosheets exhibit remarkable bifunctional electrocatalytic activity and stability for overall water splitting, which is comparable to commercial 40 wt.% platinum/carbon (Pt/C) electrocatalysts. After 60 h of continuous operation, 10 mA·cm-2 water splitting current density can still be achieved at a low potential of ~ 1.77 V without any activity decay, which is among the most active for non-noble material based electrocatalysts. The presented study provides prospects in synthesizing highly efficient bifunctional electrocatalysts for large-scale energy conversion application via a simple yet efficient technique.

Keywords

ultrafasthigh temperature synthesisgraphenewater splitting

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Nano Research
Volume 12 Issue 9,
September 2019
Pages 2259-2267
DOI: 10.1007/s12274-019-2304-0
Cite this article:
Chen Y, Xu S, Zhu S, et al. Millisecond synthesis of CoS nanoparticles for highly efficient overall water splitting. Nano Research, 2019, 12(9): 2259-2267. https://doi.org/10.1007/s12274-019-2304-0
Topics:
Cobalt compoundsCore shell nanoparticlesElectrocatalystsElectrolysis GrapheneMetal nanoparticlesSulfur compoundsTransition metals
Part of a topical collection:
NR45 Awards in NanoEnergy, 2019

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Received: 09 December 2018
Revised: 19 January 2019
Accepted: 20 January 2019
Published: 22 February 2019
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019
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