Electrode materials with hollow micro-nanostructure have exhibited exciting promise in the field of advanced energy storage devices. Herein, a template-free strategy based on the Kirkendall effect was presented to synthesize a self-supporting bimetallic selenide with hollow nanostructure as a cathode for an aqueous zinc-based battery (AZBB). This strategy discards the tedious template introduction and removal process in the traditional design of hollow micro nano structures, as well as the poor conductivity and dead volume caused by plenty of adhesives when the active materials are coated on the collector. The prepared hollow NiSe/CoSe on carbon cloth (H-NiCoSe/CC) cathode shows impressive specific capacity (405.8 mAh/g at 1A/g) and rate properties (300.2 mAh/g at 30 A/g). The assembled flexible AZBB composed of H-NiCoSe/CC cathode, Zn anode, and alkaline hydrogel electrolyte exhibits an ultra-high energy density of 557.0 W h kg and highly long cycle (about 80.0 % retention after 3000 cycles). This work provides a brand-new outlet to fabricate hollow metal selenide electrodes for potential applications in energy storage devices.

中文翻译：

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构建空心双金属硒化物作为水系锌电池正极，具有优异的倍率性能


具有中空微纳米结构的电极材料在先进储能器件领域展现出令人兴奋的前景。在此，提出了一种基于柯肯德尔效应的无模板策略来合成具有空心纳米结构的自支撑双金属硒化物作为水基锌电池（AZBB）的阴极。该策略摒弃了传统空心微纳米结构设计中繁琐的模板引入和去除过程，以及活性材料涂覆在集流体上时因大量粘合剂导致的导电性差和死体积的问题。所制备的碳布上空心 NiSe/CoSe (H-NiCoSe/CC) 阴极表现出令人印象深刻的比容量（1A/g 下为 405.8 mAh/g）和倍率性能（30 A/g 下为 300.2 mAh/g）。由H-NiCoSe/CC正极、Zn负极和碱性水凝胶电解质组成的组装柔性AZBB表现出557.0 W h kg的超高能量密度和极长的循环（3000次循环后约80.0%的保留率）。这项工作为制造空心金属硒化物电极在储能设备中的潜在应用提供了一个全新的途径。