Phase and composition controlled synthesis of cobalt sulfide hollow nanospheres for electrocatalytic water splitting

Nanoscale
Xiaoya MaXiaopeng Han

Abstract

Developing cheap, highly efficient and stable electrocatalysts for both oxygen and hydrogen evolution reactions (OER and HER) is extremely meaningful to realize large-scale implementation of water splitting technology. Herein, we report the phase and composition controlled synthesis of cobalt sulfide (CoSx) hollow nanospheres (HNSs) and their catalytic efficiencies for hydrogen and oxygen evolution reactions in alkaline media. Three CoSx compounds, i.e., Co9S8, Co3S4, and CoS2 HNSs, were precisely synthesized by simply adjusting the molar ratio of carbon disulfide to cobalt acetate using a facile solution-based strategy. Electrochemical results reveal that the as-prepared CoS2 HNSs exhibit superior OER and HER catalytic performance to Co9S8 and Co3S4 HNSs in 1.0 M KOH, with overpotentials of 290 mV for the OER and 193 mV for the HER at 10 mA cm-2, and the corresponding Tafel slopes of 57 and 100 mV dec-1, respectively. In addition, the CoS2 HNSs exhibit remarkable long-term catalytic durability, which is even superior to precious metal catalysts of RuO2 and Pt/C. Moreover, an alkaline electrolyzer assembled using CoS2 HNSs as both anode and cathode materials can achieve 10 mA cm-2 at a low cell voltage of 1.54 V at 60 °C with a...Continue Reading

References

Nov 11, 2010·Chemical Reviews·Michael G WalterNathan S Lewis
Nov 11, 2010·Chemical Reviews·Timothy R CookDaniel G Nocera
Jul 30, 2014·Nanoscale·Xianhong RuiQingyu Yan
Apr 18, 2015·Chemical Society Reviews·Xiaoxin Zou, Yu Zhang
Dec 22, 2016·ACS Applied Materials & Interfaces·Peng Fei LiuHua Gui Yang
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Nov 1, 2017·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Cao GuanJohn Wang

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Citations

Jun 20, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Rajat K TripathyJ N Behera
Jul 15, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Anurupa Maiti
Dec 5, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Yujie LiuXin Zhang
Jul 25, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Xiaoqiang DuXiaoshuang Zhang
Nov 5, 2019·ACS Applied Materials & Interfaces·Jiaying LuYang Chai
Aug 20, 2021·ChemSusChem·Arthur Corrado SalomaoMarcos Antonio Santana Andrade Junior

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Methods Mentioned

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