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首页> 外文期刊>Advanced Functional Materials >Electrochemically Derived Graphene-Like Carbon Film as a Superb Substrate for High-Performance Aqueous Zn-Ion Batteries
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Electrochemically Derived Graphene-Like Carbon Film as a Superb Substrate for High-Performance Aqueous Zn-Ion Batteries

机译：电化学衍生的类似于石墨烯的碳膜，可作为高性能水性锌离子电池的出色基材

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3D graphene, as a light substrate for active loadings, is essential to achieve high energy density for aqueous Zn-ion batteries, yet traditional synthesis routes are inefficient with high energy consumption. Reported here is a simplified procedure to transform the raw graphite paper directly into the graphene-like carbon film (GCF). The electrochemically derived GCF contains a 2D-3D hybrid network with interconnected graphene sheets, and offers a highly porous structure. To realize high energy density, the Na:MnO2/GCF cathode and Zn/GCF anode are fabricated by electrochemical deposition. The GCF-based Zn-ion batteries deliver a high initial discharge capacity of 381.8 mA h g(-1) at 100 mA g(-1) and a reversible capacity of 188.0 mA h g(-1) after 1000 cycles at 1000 mA g(-1). Moreover, a recorded energy density of 511.9 Wh kg(-1) is obtained at a power density of 137 W kg(-1). The electrochemical kinetics measurement reveals the high capacitive contribution of the GCF and a co-insertion/desertion mechanism of H+ and Zn2+ ions. First-principles calculations are also carried out to investigate the effect of Na+ doping on the electrochemical performance of layered delta-MnO2 cathodes. The results demonstrate the attractive potential of the GCF substrate in the application of the rechargeable batteries.
机译：3D石墨烯作为有效负载的轻质基质，对于实现水性Zn离子电池的高能量密度至关重要，而传统的合成路线效率低，能耗高。此处报道的是一种简化的过程，可将原始石墨纸直接转化为类石墨烯碳膜（GCF）。电化学衍生的GCF包含带有互连石墨烯片的2D-3D杂化网络，并提供高度多孔的结构。为了实现高能量密度，通过电化学沉积制备了Na：MnO2 / GCF阴极和Zn / GCF阳极。基于GCF的Zn离子电池在1000 mA g（-1）下循环1000次后，在100 mA g（-1）时具有381.8 mA hg（-1）的高初始放电容量和188.0 mA hg（-1）的可逆容量。 -1）。此外，在137 W kg（-1）的功率密度下可获得511.9 Wh kg（-1）的记录能量密度。电化学动力学测量揭示了GCF的高电容贡献以及H +和Zn2 +离子的共插入/去离子机理。还进行了第一性原理计算，以研究Na +掺杂对层状δ-MnO2阴极电化学性能的影响。结果证明了在可再充电电池的应用中GCF衬底的诱人潜力。

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