Ultrafine monolayer Co-containing layered double hydroxide nanosheets for water oxidation

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英文篇名：Ultrafine monolayer Co-containing layered double hydroxide nanosheets for water oxidation 作者：Xiaodan ; Jia ; Xin ; Zhang ; Jiaqing ; Zhao ; Yufei ; Zhao ; Yunxuan ; Zhao ; Geoffrey ; I.N.Waterhouse ; Run ; Shi ; Li-Zhu ; Wu ; Chen-Ho ; Tung ; Tierui ; Zhang 英文作者：Xiaodan Jia;Xin Zhang;Jiaqing Zhao;Yufei Zhao;Yunxuan Zhao;Geoffrey I.N.Waterhouse;Run Shi;Li-Zhu Wu;Chen-Ho Tung;Tierui Zhang;Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences;School of Chemistry and Chemical Engineering, Xi'an University of Science and Technology;University of Chinese Academy of Sciences;School of Chemical Sciences, The University of Auckland; 英文关键词：Layered double hydroxides;;Ultrafine nanosheets;;Oxidation evolution reaction 中文刊名：TRQZ 英文刊名：能源化学(英文版) 机构：Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences;School of Chemistry and Chemical Engineering, Xi'an University of Science and Technology;University of Chinese Academy of Sciences;School of Chemical Sciences, The University of Auckland; 出版日期：2019-07-15 出版单位：Journal of Energy Chemistry 年：2019 期：v.34 基金：financial support from the National Key R&D Program of China (Grant Nos.: 2017YFA0206904, 2017YFA0206900, and 2016YFB0600901);; the National Program on Key Basic Research Project (Grant No.: 2014CB239402);; the National Natural Science Foundation of China (Grant Nos.: 51772305, 51572270, U1662118, 31671489, U1332205, and 21701131);; the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No.: XDB17000000);; the Royal Society Newton Advanced Fellowship (Grant No.: NA170422);; the Young Elite Scientist Sponsorship Program by CAST (Grant No.: YESS20160137);; the Youth Innovation Promotion Association of the CAS;; the Fund of Xi’an University of Science and Technology (Grant No.:2018QDJ014);; funding support from the Energy Education Trust of New Zealand 语种：英文; 页：TRQZ201907008 页数：7 CN：07 ISSN：10-1287/O6 分类号：65-71

摘要

For many two-dimensional(2D) materials, low coordination edges and corner sites offer greatly enhanced catalytic performance compared to basal sites, motivating the search for new synthetic approaches towards ultrathin and ultrafine 2D nanomaterials with high specific surface areas. To date, the synthesis of catalysts that are both ultrathin(monolayer) and ultrafine(lateral size <10 nm) has proven extremely challenging. Herein, using a facile ultrasonic exfoliation procedure, we describe the successful synthesis of ultrafine Zn Co-LDH nanosheets(denoted as Zn Co-UF) with a size ～3.5 nm and thickness～0.5 nm. The single layer ZnCo-UF nanosheets possess an abundance of oxygen vacancies(VO) and unsaturated coordination sites, thereby affording outstanding electrocatalytic water oxidation performance. DFT calculations confirmed that VOon the surface of ZnCo-UF enhanced H_2O adsorption via increasing the electropositivity of the nanosheets.
        For many two-dimensional(2D) materials, low coordination edges and corner sites offer greatly enhanced catalytic performance compared to basal sites, motivating the search for new synthetic approaches towards ultrathin and ultrafine 2D nanomaterials with high specific surface areas. To date, the synthesis of catalysts that are both ultrathin(monolayer) and ultrafine(lateral size <10 nm) has proven extremely challenging. Herein, using a facile ultrasonic exfoliation procedure, we describe the successful synthesis of ultrafine Zn Co-LDH nanosheets(denoted as Zn Co-UF) with a size ～3.5 nm and thickness～0.5 nm. The single layer ZnCo-UF nanosheets possess an abundance of oxygen vacancies(VO) and unsaturated coordination sites, thereby affording outstanding electrocatalytic water oxidation performance. DFT calculations confirmed that VOon the surface of ZnCo-UF enhanced H_2O adsorption via increasing the electropositivity of the nanosheets.

引文

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