文献类型：期刊文献

中文题名：Oxygen vacancies enriched nickel cobalt based nanoflower cathodes: Mechanism and application of the enhanced energy storage

作者：Jiahui Ye[1];Xingwu Zhai[1];Long Chen[1];Wen Guo[1];Tiantian Gu[1];Yulin Shi[1];Juan Hou[1];Fei Han[2];Yi Liu[3];Changchun Fan[1];Gang Wang[1];Shanglong Peng[4];Xuhong Guo[5]

机构：[1]Key Laboratory for Green Process of Chemical Engineering of Xinjiang Bingtuan,School of Chemistry and Chemical Engineering,Shihezi University,Shihezi 832003,Xinjiang,China;[2]Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology,College of Materials Science and Engineering,Hunan University,Changsha 410082,Hunan,China;[3]Institut für Chemie,AG Elektrochemie,Technische Universit?t Chemnitz,Chemnitz 09111,Germany;[4]National&Local Joint Engineering Laboratory for Optical Conversion Materials and Technology,School of Physical Science and Technology,Lanzhou University,Lanzhou 730000,Gansu,China;[5]State Key Laboratory of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China

年份：2021

卷号：30

期号：11

起止页码：252

中文期刊名：Journal of Energy Chemistry

外文期刊名：能源化学（英文版）

收录：CSTPCD;;Scopus;CSCD:【CSCD2021_2022】；

基金：This work was supported by the Natural Science Foundation of China(51962032,61704114,and 51764049);the Youth Innovative Talents Cultivation Fund,Shihezi University(KX01480109);the Opening Project of The Research Center for Material Chemical Engineering Technology of Xinjiang Bingtuan(2017BTRC007).

语种：英文

中文关键词：NiCo_(2)O_(4);CoNiO_(2);Supercapacitor;Oxygen vacancy defects;Flower-like microstructure

摘要：The rational design of oxygen vacancies and electronic microstructures of electrode materials for energy storage devices still remains a challenge. Herein, we synthesize nickel cobalt-based oxides nanoflower arrays assembled with nanowires grown on Ni foam via the hydrothermal process followed annealing process in air and argon atmospheres respectively. It is found that the annealing atmosphere has a vital influence on the oxygen vacancies and electronic microstructures of resulting NiCo_(2)O_(4) (NCO-Air) and CoNiO_(2) (NCO-Ar) products, which NCO-Ar has more oxygen vacancies and larger specific surface area of 163.48 m^(2)/g. The density functional theory calculation reveals that more oxygen vacancies can provide more electrons to adsorb –OH free anions resulting in superior electrochemical energy storage performance. Therefore, the assembled asymmetric supercapacitor of NCO-Ar//active carbon delivers an excellent energy density of 112.52 Wh/kg at a power density of 558.73 W/kg and the fabricated NCO-Ar//Zn battery presents the specific capacity of 180.20 mAh/g and energy density of 308.14 Wh/kg. The experimental measurement and theoretical calculation not only provide a facile strategy to construct flower-like mesoporous architectures with massive oxygen vacancies, but also demonstrate that NCO-Ar is an ideal electrode material for the next generation of energy storage devices.