期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 26, 期 42, 页码 9382-9388出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202001055
关键词
doping; electrochemistry; layered double hydroxides; oxygen evolution reaction; urea oxidation reaction
资金
- National Natural Science Foundation of China for Youths [21601067, 21701057, 51603092]
- High-tech Research Key laboratory of Zhenjiang [SS2018002]
- China Postdoctoral Science Foundation [2017M611708]
- Jiangsu Province Postdoctoral Science Foundation [1701109B]
- Priority Academic Program Development of the Jiangsu Higher Education Institutions
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 Co1Mn1LDH/NF exhibits satisfactory OER activity with a low potential of 1.515 V to attain 10 mA cm(-2). Besides, the potential of the Co1Mn1LDH/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 Co1Mn1LDH/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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