Co-doped Ni–Mo oxides: highly efficient and robust electrocatalysts for urea electrooxidation assisted hydrogen production

Xiangyun Liu; Hehe Qin; Genxiang Wang; Qiuju Li; Qisu Huang; Zhenhai Wen; Shun Mao

doi:10.1039/D2TA04728D

Co-doped Ni–Mo oxides: highly efficient and robust electrocatalysts for urea electrooxidation assisted hydrogen production†

Xiangyun Liu,^ab Hehe Qin,^ab Genxiang Wang,^c Qiuju Li,^ab Qisu Huang,^ab Zhenhai Wen

^c and Shun Mao

*^ab

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* Corresponding authors

^a College of Environmental Science and Engineering, Biomedical Multidisciplinary Innovation Research Institute, Shanghai East Hospital, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, 1239 Siping Road, Shanghai 200092, China
E-mail: shunmao@tongji.edu.cn

^b Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China

^c CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China

Abstract

Electrolysis systems constructed by anodic urea oxidation reaction (UOR) and cathodic hydrogen evolution reaction (HER) have received considerable attention in sustainable energy and waste utilization. However, current electrolysis systems are far from the requirement of practical applications due to the limited catalytic activity and stability of the electrodes. Herein, we design a UOR electrode with Co-doped NiMoO₄ treated in Ar (NCMO–Ar), which shows superior UOR performance because of the Co doping. On the other hand, the Co-doped NiMoO₄ treated in H₂ (NCMO–H₂) delivers high activity for HER. Moreover, the use of a flow electrolysis cell is demonstrated with continuous injection of urea, which only requires a low operation potential of 1.342 V to reach 10 mA cm⁻², and shows no attenuation at a large operation current of 100 mA cm⁻² for 200 h. It is believed that this high-performance electrolysis system lays an important foundation in developing a practical electrolyzer for efficient and sustainable hydrogen production coupled with waste organic oxidation.

This article is part of the themed collection: Journal of Materials Chemistry A HOT Papers

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DOI: https://doi.org/10.1039/D2TA04728D
Article type: Paper
Submitted: 14 Jun 2022
Accepted: 19 Jul 2022
First published: 03 Aug 2022

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J. Mater. Chem. A, 2022,10, 16825-16833

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Co-doped Ni–Mo oxides: highly efficient and robust electrocatalysts for urea electrooxidation assisted hydrogen production

X. Liu, H. Qin, G. Wang, Q. Li, Q. Huang, Z. Wen and S. Mao, J. Mater. Chem. A, 2022, 10, 16825 DOI: 10.1039/D2TA04728D

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Journal of Materials Chemistry A

Co-doped Ni–Mo oxides: highly efficient and robust electrocatalysts for urea electrooxidation assisted hydrogen production†

Abstract

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Co-doped Ni–Mo oxides: highly efficient and robust electrocatalysts for urea electrooxidation assisted hydrogen production

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