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Research Article

Highly selective electrocatalytic Cl- oxidation reaction by oxygen-modified cobalt nanoparticles immobilized carbon nanofibers for coupling with brine water remediation and H2 production

Qizhong Xiong1, Xian Zhang2( ), Qipeng Cheng1, Guoqiang Liu3, Gang Xu1, Junli Li1, Xinxin Ye1( ), Hongjian Gao1
Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
Key Laboratory of Materials Physics, Centre for Environmental and Energy Nanomaterials, Anhui Key Laboratory of Nanomaterials and Nanotechnology, CAS Center for Excellence in Nanoscience, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
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Abstract

Combining the H2 production with brine remediation is regarded as a sustainable approach to achieving clean H2 energy. However, designing stable Cl- oxidation reaction (COR) electrocatalyst is the key to realize this route. Herein, a type of oxygen-modified Co nanoparticles anchored graphitic carbon nanofibers catalyst (Co/GCFs) was synthesized through a two-step strategy of adsorption and pyrolysis. The Co/GCFs-2.4 exhibits high selectivity and stability for COR at neutral electrolyte. It is worth noting that unlike the water oxidation, the chemical valence of cobalt has not changed during the COR. Further results demonstrated that the oxygen-modified Co nanoparticles provide active sites for selective COR, meanwhile, the graphitic carbon gives rise to strong catalytic stability. Thanks to the superior COR and H2 production activity of Co/GCFs-2.4, a two-electrode brine electrocatalysis system employing Co/GCFs-2.4 as both cathode and anode for H2 production exhibited robust stability, efficient and high Faraday efficiency (98%-100%). We propose that this work provides a novel strategy for designing efficient and stable catalysts with electrocatalytic COR and HER activities at neutral brine water for practically coupling with H2 production by water electrolysis and brine water remediation.

Keywords

carbon nanofibersoxygen-modified cobalt nanoparticlesbrine waterCl- oxidation reactionelectrocatalytic H2 production

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Nano Research
Volume 14 Issue 5,
May 2021
Pages 1443-1449
DOI: 10.1007/s12274-020-3200-3
Cite this article:
Xiong Q, Zhang X, Cheng Q, et al. Highly selective electrocatalytic Cl- oxidation reaction by oxygen-modified cobalt nanoparticles immobilized carbon nanofibers for coupling with brine water remediation and H2 production. Nano Research, 2021, 14(5): 1443-1449. https://doi.org/10.1007/s12274-020-3200-3
Topics:
Carbon nanofibers CobaltElectrocatalysis ElectrocatalystsElectrodesElectrolytesNanocatalystsNanoparticlesOxidationOxygenSynthesis (chemical)

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Received: 22 July 2020
Revised: 13 October 2020
Accepted: 20 October 2020
Published: 19 November 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature
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