An Cuihua, Zhang Yan, Guo Huinan, Wang Yijing
Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center, College of Chemistry, Nankai University Tianjin 300071 P. R. China
Tianjin Key Laboratory of Advanced Functional Porous Materials, School of Materials Science and Engineering, Tianjin University of Technology, Institute for New Energy Material & Low-Carbon Technologies Tianjin 300384 P. R. China.
Nanoscale Adv. 2019 Oct 9;1(12):4644-4658. doi: 10.1039/c9na00543a. eCollection 2019 Dec 3.
Distinguished by particular physical and chemical properties, metal oxide materials have been a focus of research and exploitation for applications in energy storage devices. Used as supercapacitor electrode materials, metal oxides have certified attractive performances for fabricating various supercapacitor devices in a broad voltage window. In comparison with single metal oxides, bimetallic oxide materials are highly desired for overcoming the constraint of the poor electric conductivity of single metal oxide materials, achieving a high capacitance and raising the energy density at this capacitor-level power. Herein, we investigate the principal elements affecting the properties of bimetallic oxide electrodes to reveal the relevant energy storage mechanisms. Thus, the influences of the chemical constitution, structural features, electroconductivity, oxygen vacancies and various electrolytes in the electrochemical behavior are discussed. Moreover, the progress, development and improvement of multifarious devices are emphasized systematically, covering from an asymmetric to hybrid configuration, and from aqueous to non-aqueous systems. Ultimately, some obstinate and unsettled issues are summarized as well as a prospective direction has been given on the future of metal oxide-based supercapacitors.
金属氧化物材料因其独特的物理和化学性质，一直是储能设备应用研究与开发的重点。作为超级电容器电极材料，金属氧化物在宽电压窗口下制造各种超级电容器器件方面已展现出具有吸引力的性能。与单一金属氧化物相比，双金属氧化物材料非常有助于克服单一金属氧化物材料导电性差的限制，在这种电容器级功率下实现高电容并提高能量密度。在此，我们研究影响双金属氧化物电极性能的主要因素，以揭示相关的储能机制。因此，讨论了化学组成、结构特征、电导率、氧空位和各种电解质对电化学行为的影响。此外，系统地强调了各种器件从不对称配置到混合配置，从水系到非水系体系的进展、发展和改进。最后，总结了一些棘手且未解决的问题，并给出了基于金属氧化物的超级电容器未来的前瞻性方向。
