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Nano Research 2017, 10(5): 1819-1831 https://doi.org/10.1007/s12274-017-1511-9
Research Article | Issue | Published: 17 March 2017

Co-vacancy-rich Co1-x S nanosheets anchored on rGO for high-efficiency oxygen evolution

Show Author's Information Jiaqing Zhu1,  Zhiyu Ren1( ),  Shichao Du1,  Ying Xie1,  Jun Wu1,2,  Huiyuan Meng1,  Yuzhu Xue1,  Honggang Fu1( )
Key Laboratory of Functional Inorganic Material ChemistryMinistry of Education of the People's Republic of ChinaSchool of Chemistry and Materials ScienceHeilongjiang UniversityHarbin150080China
College of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin150001China
Keywords:
nanosheets, electrocatalysis, oxygen evolution reaction, cobalt vacancies (V′Co), Co1-xS
Cite this article:
Zhu J, Ren Z, Du S, et al. Co-vacancy-rich Co1-x S nanosheets anchored on rGO for high-efficiency oxygen evolution. Nano Research, 2017, 10(5): 1819-1831. https://doi.org/10.1007/s12274-017-1511-9
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Abstract Full text Electronic supplementary material About this article

Developing cost-efficient electrocatalysts for oxygen evolution is vital for the viability of H2 energy generated via electrolytic water. Engineering favorable defects on the electrocatalysts to provide accessible active sites can boost the sluggish reaction thermodynamics or kinetics. Herein, Co1-xS nanosheets were designed and grown on reduced graphene oxide (rGO) by controlling the successive two-step hydrothermal reaction. A belt-like cobalt-based precursor was first formed with the assistance of ammonia and rGO, which were then sulfurized into Co1-xS by L-cysteine at a higher hydrothermal temperature. Because of the non-stoichiometric defects and ultrathin sheet-like structure, additional cobalt vacancies (V'Co) were formed/exposed on the catalyst surface, which expedited the charge diffusion and increased the electroactive surface in contact with the electrolyte. The resulting Co1-xS/rGO hybrids exhibited an overpotential as low as 310 mV at 10 mA·cm-2 in an alkaline electrolyte for the oxygen evolution reaction (OER). Density functional theory calculations indicated that the V'Co on the Co1-xS/rGO hybrid functioned as catalytic sites for enhanced OER. They also reduced the energy barrier for the transformation of intermediate oxygenated species, promoting the OER thermodynamics.


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Electronic supplementary material
About this article

Co-vacancy-rich Co1-x S nanosheets anchored on rGO for high-efficiency oxygen evolution

Show Author's information Jiaqing Zhu1, Zhiyu Ren1( ), Shichao Du1, Ying Xie1, Jun Wu1,2, Huiyuan Meng1, Yuzhu Xue1, Honggang Fu1( )
Key Laboratory of Functional Inorganic Material ChemistryMinistry of Education of the People's Republic of ChinaSchool of Chemistry and Materials ScienceHeilongjiang UniversityHarbin150080China
College of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin150001China

Abstract

Developing cost-efficient electrocatalysts for oxygen evolution is vital for the viability of H2 energy generated via electrolytic water. Engineering favorable defects on the electrocatalysts to provide accessible active sites can boost the sluggish reaction thermodynamics or kinetics. Herein, Co1-xS nanosheets were designed and grown on reduced graphene oxide (rGO) by controlling the successive two-step hydrothermal reaction. A belt-like cobalt-based precursor was first formed with the assistance of ammonia and rGO, which were then sulfurized into Co1-xS by L-cysteine at a higher hydrothermal temperature. Because of the non-stoichiometric defects and ultrathin sheet-like structure, additional cobalt vacancies (V'Co) were formed/exposed on the catalyst surface, which expedited the charge diffusion and increased the electroactive surface in contact with the electrolyte. The resulting Co1-xS/rGO hybrids exhibited an overpotential as low as 310 mV at 10 mA·cm-2 in an alkaline electrolyte for the oxygen evolution reaction (OER). Density functional theory calculations indicated that the V'Co on the Co1-xS/rGO hybrid functioned as catalytic sites for enhanced OER. They also reduced the energy barrier for the transformation of intermediate oxygenated species, promoting the OER thermodynamics.

Keywords: nanosheets, electrocatalysis, oxygen evolution reaction, cobalt vacancies (V′Co), Co1-xS

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Publication history
Copyright
Acknowledgements

Publication history

Received: 25 December 2016
Revised: 22 January 2017
Accepted: 03 February 2017
Published: 17 March 2017
Issue date: May 2017

Copyright

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2017

Acknowledgements

Acknowledgements

We gratefully acknowledge the support of this research by the National Natural Science Foundation of China (Nos. 21631004, 21371053, and 21573062), the Project for Foshan Innovation Group (No. 2014IT100062), Application Technology Research and Development Projects in Harbin (No. 2013AE4BW051), the International Science & Technology Cooperation Program of China (No. 2014DFR41110), the Foundation of Heilongjiang Province of China (No. QC2013C009) and the supporting plan for Excellent Youth of Heilongjiang University (No. JCL201501).

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