期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 829, 期 -, 页码 81-87出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2018.10.007
关键词
Ni(OH)(2) sheets; Ni(III) rich; Two-dimensional; Electrocatalysis; Urea electro-oxidation
资金
- National Natural Science Foundation of China [21363003, 21165004, 21163002]
- Natural Science Foundation of Guangxi Province [2014GXNSFGA118008, 2014GXNSFFA118003]
- BAGUI scholar program [2014A001]
- Project of Talents Highland of Guangxi Province
Development of high-efficient and stable electrocatalysts for urea oxidation reaction (UOR) is of a great challenge due to the sluggish kinetics of 6e(- )transfer process. Here, we have developed a facile and easy-to-scale approach to fabricate two-dimensional Ni(III)-rich Ni(OH)(2) nanosheets on amine-functionalized carbon (Ni3+-rich Ni(OH)(2)/C-NH2). Morphological characterizations confirm the existence of nanosheets, and XPS spectra indicate that the content of Ni3+ species in Ni3+-rich Ni(OH)(2)/C-NH2 (ca. 57.6%) is significantly higher than that of in Ni(OH)(2)/C-NH2 (ca. 43.1%) and Ni(OH)(2)/C (ca. 20.7%). Electrochemical analyses illustrate that the as-prepared Ni3+-rich Ni(OH)(2)/C-NH2 catalyst exhibits the highest current density (91.72 rnA cm(-2)) at a potential of 0.61 V, which is 2.06-, 2.08- and 3.47-fold higher than that of Ni(OH)(2)/C-NH2,Ni(OH)(2)/C and Pt/C, respectively. Moreover, the Ni3+-rich Ni(OH)(2)/C-NH2 catalyst also demonstrates an outstanding voltammetric cycles and long-term chronoamperometric stability. The superior electrocatalytic activity and stability could be ascribed to the synergistic effect of Ni3+ doping as well as the amine-fimctionalized carbon, where higher concentration Ni3+ species in Ni(OH)(2) sheets could provide more active sites for adsorption and transformation of urea molecules, while fluffy C-NH2 support could enhance the ability of solute diffusion, electron transport and gas emissions, thereby dramatically improve the catalytic activity.
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