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Nano Research 2023, 16(2): 2111-2118 https://doi.org/10.1007/s12274-022-4930-1
Research Article | Issue | Published: 22 October 2022

Iron adsorption engineering facilitated by Cu doping on cobalt hydroxide host with enhanced oxygen evolution reaction

Show Author's Information Xinyu Zhang1,  Yiwen Dong1,  Huiying Wang1,  Ziyi Zhao1,  Wenchun Jiang2,  Bin Dong1( ),  Han Hu1,  Chenguang Liu1,  Yongming Chai1( )
State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China
College of New Energy, China University of Petroleum (East China), Qingdao 266580, China
Keywords:
oxygen evolution reaction, copper doping, promoted Fe adsorption, industrial-level current density, anion exchange membrane water electrolyzer
Topics:
Electrocatalysts
Cite this article:
Zhang X, Dong Y, Wang H, et al. Iron adsorption engineering facilitated by Cu doping on cobalt hydroxide host with enhanced oxygen evolution reaction. Nano Research, 2023, 16(2): 2111-2118. https://doi.org/10.1007/s12274-022-4930-1
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Abstract Full text Electronic supplementary material About this article

Iron plays a crucial role in improving the oxygen evolution reaction (OER) activity of hydroxide materials. Increasing the number of iron active sites at the solid–liquid interface is beneficial to enhancing the OER performance of catalysts but still challenging. Here, by systematic exploring the activity trends of M(OH)x and Cu-M(OH)x (M = Mn, Cu, Ni, Fe, and Co), we discover that the Cu doping can promote the deposition of Fe active sites on metal hydroxide and Cu-Co(OH)2 shows the most favorable iron adsorption capacity. When loaded on a conductive substrate (cobalt foam (CF), the M-Cu-Co(OH)2/CF (Co(OH)2 prepared by molten salt method) exhibits an attractive low overpotential of 337 mV at 1,000 mA·cm−2. Using in anion exchange membrane (AEM) water electrolyzer, the single cell with M-Cu-Co (OH)2/CF as anode catalyst performs a stable cell voltage of 2.02 V to reach 1,000 mA·cm−2 over 24 h, indicating a great application potential for actual electrolytic water. Therefore, the promoted adsorption of copper on iron provides a new perspective for further enhancing the OER activity of other metal hydroxides.


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About this article

Iron adsorption engineering facilitated by Cu doping on cobalt hydroxide host with enhanced oxygen evolution reaction

Show Author's information Xinyu Zhang1, Yiwen Dong1, Huiying Wang1, Ziyi Zhao1, Wenchun Jiang2, Bin Dong1( ), Han Hu1, Chenguang Liu1, Yongming Chai1( )
State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China
College of New Energy, China University of Petroleum (East China), Qingdao 266580, China

Abstract

Iron plays a crucial role in improving the oxygen evolution reaction (OER) activity of hydroxide materials. Increasing the number of iron active sites at the solid–liquid interface is beneficial to enhancing the OER performance of catalysts but still challenging. Here, by systematic exploring the activity trends of M(OH)x and Cu-M(OH)x (M = Mn, Cu, Ni, Fe, and Co), we discover that the Cu doping can promote the deposition of Fe active sites on metal hydroxide and Cu-Co(OH)2 shows the most favorable iron adsorption capacity. When loaded on a conductive substrate (cobalt foam (CF), the M-Cu-Co(OH)2/CF (Co(OH)2 prepared by molten salt method) exhibits an attractive low overpotential of 337 mV at 1,000 mA·cm−2. Using in anion exchange membrane (AEM) water electrolyzer, the single cell with M-Cu-Co (OH)2/CF as anode catalyst performs a stable cell voltage of 2.02 V to reach 1,000 mA·cm−2 over 24 h, indicating a great application potential for actual electrolytic water. Therefore, the promoted adsorption of copper on iron provides a new perspective for further enhancing the OER activity of other metal hydroxides.

Keywords: oxygen evolution reaction, copper doping, promoted Fe adsorption, industrial-level current density, anion exchange membrane water electrolyzer

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Publication history
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Acknowledgements

Publication history

Received: 08 August 2022
Revised: 15 August 2022
Accepted: 16 August 2022
Published: 22 October 2022
Issue date: February 2023

Copyright

© Tsinghua University Press 2022

Acknowledgements

Acknowledgements

This work is financially supported by the National Natural Science Foundation of China (No. 52174283), Innovation Fund Project for Graduate Student of China University of Petroleum (East China) (No. 22CX04026A), and the Fundamental Research Funds for the Central Universities.

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