Hydrazine-assisted electrolytic hydrogen production: CoS2 nanoarray as a superior bifunctional electrocatalyst

Xiao Ma; Jianmei Wang; Danni Liu; Rongmei Kong; Shuai Hao; Gu Du; Abdullah M. Asiri; Xuping Sun

doi:10.1039/C7NJ00326A

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Hydrazine-assisted electrolytic hydrogen production: CoS₂ nanoarray as a superior bifunctional electrocatalyst†

Xiao Ma,^a Jianmei Wang,^a Danni Liu,^a Rongmei Kong,^b Shuai Hao,^a Gu Du,^c Abdullah M. Asiri

^d and Xuping Sun

*^a

Author affiliations

* Corresponding authors

^a College of Chemistry, Sichuan University, Chengdu 610064, China
E-mail: sunxp@ciac.ac.cn

^b College of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, China

^c Institute of Geology and Mineral Resources, Chengdu 610081, China

^d Chemistry Department & Center of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah 21589, Saudi Arabia

Abstract

The sluggish kinetics of the oxygen evolution reaction has severely hindered the energetic convenience of electrolytic water splitting. Herein, we demonstrate that a CoS₂ nanoarray on Ti mesh (CoS₂/TiM) behaves as an efficient and durable catalyst for the hydrazine oxidation reaction in 1.0 M KOH with 100 mM hydrazine, which requires the potential of 125 mV to achieve 100 mA cm⁻². The high hydrogen-evolving activity of CoS₂/TiM makes it a bifunctional catalyst for energy-saving electrolytic hydrogen generation by replacing water oxidation with hydrazine oxidation. To drive 100 mA cm⁻², its two-electrode electrolyzer demands a low cell voltage of only 0.81 V and it exhibits remarkable long-term electrochemical durability and nearly 100% Faradic efficiency for hydrogen evolution.

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Article information

DOI: https://doi.org/10.1039/C7NJ00326A
Article type: Letter
Submitted: 31 Jan 2017
Accepted: 05 May 2017
First published: 08 May 2017

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New J. Chem., 2017,41, 4754-4757

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Hydrazine-assisted electrolytic hydrogen production: CoS₂ nanoarray as a superior bifunctional electrocatalyst

X. Ma, J. Wang, D. Liu, R. Kong, S. Hao, G. Du, A. M. Asiri and X. Sun, New J. Chem., 2017, 41, 4754 DOI: 10.1039/C7NJ00326A

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