Interface engineering for enhancing electrocatalytic oxygen evolution reaction of CoS/CeO<sub>2</sub> heterostructures

doi:10.1007/s11705-021-2062-x

Front. Chem. Sci. Eng.

2022, Vol. 16

Issue (3) : 376-383 https://doi.org/10.1007/s11705-021-2062-x

RESEARCH ARTICLE

Interface engineering for enhancing electrocatalytic oxygen evolution reaction of CoS/CeO₂ heterostructures

Hongtao Xie^1,², Qin Geng², Xiaoyue Liu¹, Jian Mao¹(

)

¹. College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China
². Yangtze Delta Region Institute of University of Electronic Science and Technology of China, Huzhou 313000, China

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Abstract

To realize renewable energy conversion, it is important to develop low-cost and high-efficiency electrocatalyst for oxygen evolution reaction. In this communication, a novel bijunction CoS/CeO₂ electrocatalyst grown on carbon cloth is prepared by the interface engineering. The interface engineering of CoS and CeO₂ facilitates a rapid charge transfer from CeO₂ to CoS. Such an electrocatalyst exhibits outstanding electrocatalytic activity with a low overpotential of 311 mV at 10 mA∙cm⁻² and low Tafel slope of 76.2 mV∙dec^–1, and is superior to that of CoS (372 mV) and CeO₂ (530 mV) counterparts. And it has long-term durability under alkaline media.

Keywords interface engineering CoS/CeO₂ electrodeposition electrocatalyst oxygen evolution reaction

Corresponding Author(s): Jian Mao

Online First Date: 13 July 2021 Issue Date: 24 February 2022

Cite this article:

Hongtao Xie,Qin Geng,Xiaoyue Liu, et al. Interface engineering for enhancing electrocatalytic oxygen evolution reaction of CoS/CeO₂ heterostructures[J]. Front. Chem. Sci. Eng., 2022, 16(3): 376-383.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-021-2062-x
https://academic.hep.com.cn/fcse/EN/Y2022/V16/I3/376

Fig.1 (a and b) SEM images, (c) TEM and (d) HR-TEM images of CoS/CeO₂/CC; (e) elemental mapping images Co, S, O and Ce on the surface of CC.

Fig.2 (a) Co 2p, (b) S 2p, (c) Ce 3d, and (d) O 1s HR-XPS spectra of CeO₂/CC, CoS/CC, and CoS/CeO₂/CC.

Fig.3 (a) The polarization curves and (b) Tafel plots of as-synthesized catalysts (The multi-current process of CoS/CeO₂/CC); (c) the current density started at 10 mA?cm⁻² and ended at 60 mA?cm⁻², with an increment of 10 mA?cm⁻² per 1000 s; (d) OER polarization curves for the CoS/CeO₂/CC before and after different cycles of accelerated stability test; (e) time-dependent OER stability of CoS/CeO₂/CC with a constant current density of 10 mA?cm⁻² for more than 30 h.

Fig.4 (a) Density of state plots of CoS/CeO₂, CoS, and CeO₂, (b) charge density difference (Green regions represent the electron accumulation), (c) electron localization functions of CoS/CeO₂.

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