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Hybrid Energy Storage Device: Combination of Zinc-Ion Supercapacitor and Zinc-Air Battery in Mild Electrolyte.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-01-28 , DOI: 10.1021/acsami.9b20629
Guoqiang Sun 1 , Yukun Xiao 1 , Bing Lu 1 , Xuting Jin 1 , Hongsheng Yang 1 , Chunlong Dai 1 , Xinqun Zhang 1 , Yang Zhao 1 , Liangti Qu 1, 2, 3
Affiliation  

In this work, a new type of hybrid energy storage device is constructed by combining the zinc-ion supercapacitor and zinc-air battery in mild electrolyte. Reduced graphene oxide with rich defects, large surface area, and abundant oxygen-containing functional groups is used as active material, which exhibits two kinds of charge storage mechanisms of capacitor and battery simultaneously. Apart from the physical adsorption/desorption of anions on the surface of graphene, the zinc ions in electrolyte will be electrochemically adsorbed/desorbed onto the oxygen-containing groups of graphene during the charge/discharge process, contributing extra capacitance to the device. Moreover, the defects in graphene will further improve the electrochemical performance of the energy storage device via catalyzing the oxygen reduction reaction with exposure to air. Consequently, the synergistic effect leads to a record high capacitance of 370.8 F g-1 at a current density of 0.1 A g-1, which is higher than that of zinc-ion supercapacitors reported previously. Furthermore, the hybrid device exhibits a superior cycling stability with 94.5% capacitance retention even after 10000 charge/discharge cycles at a high current density of 5 A g-1. Interestingly, the developed hybrid device can be self-charging automatically after the power is exhausted in the ambient atmosphere. Other electrode materials, such as carbon nanotube paper, are also used to build a hybrid device to verify the feasibility of this strategy. This facile, green, and convenient strategy provides new insight for developing a high performance storage device, showing great application prospect in other hybrid energy storage devices in mild electrolyte.

中文翻译:

混合储能装置:在轻度电解液中结合了锌离子超级电容器和锌空气电池。

在这项工作中,通过将锌离子超级电容器和锌空气电池结合在温和的电解质中,构建了一种新型的混合式储能装置。具有丰富的缺陷,较大的表面积和丰富的含氧官能团的还原型氧化石墨烯被用作活性材料,其同时表现出电容器和电池的两种电荷存储机理。除了石墨烯表面上阴离子的物理吸附/解吸之外,在充电/放电过程中,电解质中的锌离子还将被电化学吸附/解吸到石墨烯的含氧基团上,从而为器件带来了额外的电容。此外,石墨烯中的缺陷将通过在暴露于空气中催化氧还原反应来进一步改善能量存储装置的电化学性能。因此,在电流密度为0.1 A g-1时,协同效应导致了370.8 F g-1的创纪录高电容,这高于先前报道的锌离子超级电容器的电容。此外,即使在5 A g-1的高电流密度下进行10000次充电/放电循环后,该混合动力装置仍具有出色的循环稳定性和94.5%的电容保持率。有趣的是,开发的混合动力设备可以在环境大气中的电力耗尽后自动进行自充电。其他电极材料(例如碳纳米管纸)也用于构建混合设备,以验证该策略的可行性。这种便捷,绿色,便捷的策略为开发高性能存储设备提供了新的见解,
更新日期:2020-01-29
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