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Nano Research

Article Title

Millisecond synthesis of CoS nanoparticles for highly efficient overall water splitting

Authors

Yanan Chen, Department of Materials Science and Engineering, University of Maryland College Park, College Park, Maryland 20742, USA
Shaomao Xu, Department of Materials Science and Engineering, University of Maryland College Park, College Park, Maryland 20742, USA
Shuze Zhu, Department of Mechanical Engineering, University of Maryland College Park, College Park, Maryland 20742, USA
Rohit Jiji Jacob, Department of Chemical and Biomolecular Engineering and Chemistry and Biochemistry, University of Maryland College Park, College Park, Maryland 20742, USA
Glenn Pastel, Department of Materials Science and Engineering, University of Maryland College Park, College Park, Maryland 20742, USA
Yanbin Wang, Department of Materials Science and Engineering, University of Maryland College Park, College Park, Maryland 20742, USA
Yiju Li, Department of Materials Science and Engineering, University of Maryland College Park, College Park, Maryland 20742, USA
Jiaqi Dai, Department of Materials Science and Engineering, University of Maryland College Park, College Park, Maryland 20742, USA
Fengjuan Chen, Department of Materials Science and Engineering, University of Maryland College Park, College Park, Maryland 20742, USA
Hua Xie, Department of Materials Science and Engineering, University of Maryland College Park, College Park, Maryland 20742, USA
Boyang Liu, Department of Materials Science and Engineering, University of Maryland College Park, College Park, Maryland 20742, USA
Yonggang Yao, Department of Materials Science and Engineering, University of Maryland College Park, College Park, Maryland 20742, USA
Lourdes G. Salamanca-Riba, Department of Materials Science and Engineering, University of Maryland College Park, College Park, Maryland 20742, USA
Michael R. Zachariah, Department of Chemical and Biomolecular Engineering and Chemistry and Biochemistry, University of Maryland College Park, College Park, Maryland 20742, USA
Teng Li, Department of Mechanical Engineering, University of Maryland College Park, College Park, Maryland 20742, USA
Liangbing Hu, Department of Materials Science and Engineering, University of Maryland College Park, College Park, Maryland 20742, USA

Keywords

ultrafast, high temperature synthesis, graphene, water splitting

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.

Graphical Abstract

Publisher

Tsinghua University Press

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