Long Jun, Yang Fuhua, Cuan Jing, Wu Jingxing, Yang Zhanhong, Jiang Hao, Song Rui, Song Wenlong, Mao Jianfeng, Guo Zaiping
Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China.
Institute for Superconducting & Electronic Materials, Australian Institute for Innovative Materials (AIIM), School of Mechanical, Materials, Mechatronics and Biomedical Engineering, University of Wollongong, Wollongong, New South Wales 2522, Australia.
ACS Appl Mater Interfaces. 2020 Jul 22;12(29):32526-32535. doi: 10.1021/acsami.0c05812. Epub 2020 Jul 8.
Aqueous ZIBs are one of the most promising next-generation rechargeable batteries because of the high capacity, high hydrogen evolution overpotential, and chemically stable reversible plating/stripping of the zinc electrode in the mild aqueous electrolyte. However, there are limited cathode materials that can store Zn reversibly with superior cycling and rate capability. Herein, hierarchically porous nanorods composed of twinborn α-(MnO-MnO) heterostructures are proposed as a robust cathode for Zn storage. Thanks to the hierarchically porous nanorod morphology and the abundant interface of the heterostructures involving a built-in electric field, the as-obtained twinborn α-(MnO-MnO) electrode delivers a high capacity of 170 mA h g for 2000 cycles at 500 mA g and shows an excellent rate capability of up to 1.5 A g with a capacity of 124 mA h g. The inspiring results achieved exhibit the enormous potential of the high-performance heterostructure cathode for fast and stable ZIBs.
水系锌离子电池是最具前景的下一代可充电电池之一，因为在温和的水系电解质中，锌电极具有高容量、高析氢过电位以及化学稳定的可逆电镀/剥离性能。然而，能够在具有优异循环和倍率性能的情况下可逆存储锌的阴极材料有限。在此，由孪生α-(MnO-MnO)异质结构组成的分级多孔纳米棒被提出作为一种用于锌存储的坚固阴极。得益于分级多孔纳米棒形态以及异质结构中包含内置电场的丰富界面，所制备的孪生α-(MnO-MnO)电极在500 mA g下2000次循环时可提供170 mA h g的高容量，并且在1.5 A g的高电流密度下仍具有124 mA h g的容量，展现出优异的倍率性能。这些令人鼓舞的结果表明高性能异质结构阴极在快速稳定的水系锌离子电池方面具有巨大潜力。
