Manganese-Modulated Cobalt-Based Layered Double Hydroxide Grown on Nickel Foam with 1D–2D–3D Heterostructure for Highly Efficient Oxygen Evolution Reaction and Urea Oxidation Reaction |
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Authors: | Zhaolong Wang Yiming Hu Wenjun Liu Dr. Li Xu Dr. Meili Guan Dr. Yan Zhao Dr. Jian Bao Prof. Huaming Li |
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Affiliation: | 1. School of Chemistry and Chemical Engineering, Institute for Energy Research, Jiangsu University, Zhenjiang, Jiangsu, 212013 P. R. China These authors contributed equally to this work.;2. School of Chemistry and Chemical Engineering, Institute for Energy Research, Jiangsu University, Zhenjiang, Jiangsu, 212013 P. R. China |
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Abstract: | Hydrogen production by energy-efficient water electrolysis is a green avenue for the development of contemporary society. However, the oxygen evolution reaction (OER) and the urea oxidation reaction (UOR) occurring at the anode are impeded by the sluggish reaction kinetics during the water-splitting process. Consequently, it is promising to develop bifunctional anodic electrocatalysts consisting of nonprecious metals. Herein, a bifunctional CoMn layered double hydroxide (LDH) was grown on nickel foam (NF) with a 1D–2D–3D hierarchical structure for efficient OER and UOR performance in alkaline solution. Owing to the significant synergistic effect of Mn doping and heterostructure engineering, the obtained Co1Mn1 LDH/NF exhibits satisfactory OER activity with a low potential of 1.515 V to attain 10 mA cm−2. Besides, the potential of the Co1Mn1 LDH/NF catalyst for UOR at the same current density is only 1.326 V, which is much lower than those of its counterparts and most reported electrocatalysts. An urea electrolytic cell with a Co1Mn1 LDH/NF anode and a Pt–C/NF cathode was established, and a low cell voltage of 1.354 V at 10 mA cm−2 was acquired. The optimized strategy may result in promising candidates for developing a new generation of bifunctional electrocatalysts for clean energy production. |
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Keywords: | doping electrochemistry layered double hydroxides oxygen evolution reaction urea oxidation reaction |
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