Qian Guangfu, Chen Jinli, Luo Lin, Zhang Hao, Chen Wei, Gao Zhejiang, Yin Shibin, Tsiakaras Panagiotis
College of Chemistry and Chemical Engineering, School of Physical Science and Technology, State Key Laboratory of Processing for Non-Ferrous Metal and Featured Materials, Guangxi University, 100 Daxue Road, Nanning 530004, P. R. China.
Laboratory of Electrochemical Devices based on Solid Oxide Proton Electrolytes, Institute of High Temperature Electrochemistry, Russian Academy of Sciences, Yekaterinburg 620990, Russia.
ACS Appl Mater Interfaces. 2020 Aug 26;12(34):38061-38069. doi: 10.1021/acsami.0c09319. Epub 2020 Aug 11.
Developing high performance bifunctional transition metal catalysts would be significantly beneficial for electrocatalytic oxidation of urea-rich wastewater. Herein, we synthesize a VO nanosheet anchored N-doped-carbon encapsulated Ni heterostructure (Ni@C-VO/NF) for the reactions of urea oxidation (UOR) and hydrogen evolution (HER). Electrochemical results indicate that it exhibits small potentials of 1.32, 1.39, and 1.43 V for UOR and low overpotentials of 36, 254, and 355 mV for HER at ±10, ± 500 and ±1000 mA cm, respectively. It can work at 100 mA cm for over 72 h as cathode and anode electrode without obvious attenuation, suggesting an outstanding durability. The reason for this behavior could be ascribed to the N-doped-carbon coating structure, the synergetic effects between Ni and VO, and the nano/micro nanosheets architecture self-supported on nickel foam. This work could provide a promising, inexpensive, and green method for the degradation of urea-rich wastewater and hydrogen production.
开发高性能双功能过渡金属催化剂对富含尿素的废水的电催化氧化具有显著益处。在此，我们合成了一种VO纳米片锚定的N掺杂碳包覆Ni异质结构（Ni@C-VO/NF）用于尿素氧化反应（UOR）和析氢反应（HER）。电化学结果表明，在±10、±500和±1000 mA cm时，其UOR的电位分别为1.32、1.39和1.43 V，HER的过电位分别为36、254和355 mV。它可以在100 mA cm下作为阴极和阳极工作超过72小时而无明显衰减，表明其具有出色的耐久性。这种行为的原因可归因于N掺杂碳涂层结构、Ni和VO之间的协同效应以及自支撑在泡沫镍上的纳米/微米纳米片结构。这项工作可为富含尿素的废水降解和制氢提供一种有前景、廉价且绿色的方法。
