Anion and cation substitution in transition-metal oxides nanosheets for high-performance hybrid supercapacitors

被引:300
作者
Li, Jinghua [1 ]
Liu, Zaichun [2 ,3 ,4 ]
Zhang, Qiaobao [1 ]
Cheng, Yong [1 ]
Zhao, Bote [5 ]
Dai, Shuge [6 ]
Wu, Hong-Hui [7 ]
Zhang, Kaili [8 ]
Ding, Dong [5 ]
Wu, Yuping [2 ,3 ,4 ]
Liu, Meilin [5 ]
Wang, Ming-Sheng [1 ]
机构
[1] Xiamen Univ, Coll Mat, Dept Mat Sci & Engn, Xiamen 361005, Fujian, Peoples R China
[2] Nanjing Tech Univ, State Key Lab Mat Oriented Chem Engn, Nanjing 211816, Jiangsu, Peoples R China
[3] Nanjing Tech Univ, Sch Energy Sci & Engn, Nanjing 211816, Jiangsu, Peoples R China
[4] Nanjing Tech Univ, Inst Adv Mat, Nanjing 211816, Jiangsu, Peoples R China
[5] Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA
[6] Zhengzhou Univ, Sch Phys Engn, Zhengzhou 450052, Henan, Peoples R China
[7] Univ Nebraska, Dept Chem, Lincoln, NE 68588 USA
[8] City Univ Hong Kong, Dept Mech & Biomed Engn, 83 Tat Chee Ave, Hong Kong, Peoples R China
基金
中国国家自然科学基金; 国家重点研发计划;
关键词
ZnNiCo phosphide nanosheets; Hierarchical architecture; Anion and cation substitution; DFT calculations; Hybrid supercapacitors; ENERGY-STORAGE; NANOWIRE ARRAYS; FACILE SYNTHESIS; ELECTRODES; GRAPHENE; DENSITY; HYDROXIDE; DESIGN; CO3O4; FOAM;
D O I
10.1016/j.nanoen.2018.12.011
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Anion and cation substitution is an effective way in modulating electrochemical properties of electrode materials to achieve enhanced performance. Herein, we report our finding in the fabrication of advanced binder-free supercapacitor electrodes of hierarchical anion- (phosphorus-) and cation- (zinc- and nickel-) substituted cobalt oxides (denoted as ZnNiCo-P) architectures assembled from nanosheets grown directly on Ni foam. In contrast to the reference Co-P systems, the as-prepared electrode manifests a markedly improved electrochemical performance with a high specific capacity of similar to 958 C g(-1) at 1 A g(-1) and an outstanding rate capability (787 C g(-1) at 20 A g(-1)) due to its compositional and structural advantages. Density functional theory calculations confirm that the Co species partially replaced by Zn/Ni and O species by P can simultaneously improve the charge transfer behavior and facilitate the OH-adsorption and deprotonation/protonation reaction process. Moreover, an aqueous hybrid supercapacitor based on self-supported ZnNiCo-P nanosheet electrode demonstrates a high energy density of 60.1 Wh kg(-1) at a power density of 960 Wkg(-1), along with a superior cycling performance (89% of initial specific capacitance after 8000 cycles at 10 A g(-1) is retained). These findings offer insights into the rational design of transition metal compounds with multi-components and favorable architectures by manipulating the cations and anions of metal compounds for high-performance supercapacitors.
引用
收藏
页码:22 / 33
页数:12
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