Gupta Himanshu, Dahiya Yogita, Rathore Hem Kanwar, Awasthi Kamlendra, Kumar Manoj, Sarkar Debasish
Department of Physics, Malaviya National Institute of Technology Jaipur, Jaipur, Rajasthan 302017, India.
ACS Appl Mater Interfaces. 2023 Sep 13;15(36):42685-42696. doi: 10.1021/acsami.3c09202. Epub 2023 Aug 31.
Zinc ion hybrid supercapacitors (ZIHSCs) are truly promising as next-generation high-performance energy storage systems because they could offer high energy density like batteries while exhibiting high power output and long cycle life traits of supercapacitors. The key point of constructing a high-performance ZIHSC is to couple the Zn anode with an appropriate cathode material, which has high theoretical capacity, cost-effectiveness, and intrinsic safety features. In this work, we have demonstrated the potentiality of S, N co-doped porous carbon nanocubes (S, N-CNCs) as a cathode material for devising a ZIHSC with excellent energy density and cycle life. The S, N-CNCs are prepared from a zeolitic imidazolate framework (ZIF)-8 precursor via a simultaneous pyrolyzing-doping strategy in an inert atmosphere. Resultant CNCs are monodisperse with an average size of around 65 nm and porous in nature, with uniform N and S doping throughout the structure. Benefitted from such hierarchical porous architecture and the presence of abundant heteroatoms, the assembled ZIHSC with S, N-CNC as the cathode and Zn-foil as the anode in a ZnSO aqueous electrolyte could reach a specific capacity as high as 165.5 mA h g (331 F g) at 1 A g, which corresponds to a satisfactory energy density of 148.9 W h kg at the power density of 900 W kg. The ZIHSC has displayed a good cycle stability with more than 70% capacity retention after 10,000 charge-discharge cycles. Furthermore, to verify the practical feasibility of such a cathode material, an aqueous 3D Zn@Cu//S, N-CNC full-cell device is fabricated, which has demonstrated a satisfactory specific capacity (49.6 mAh g at 0.25 A g) and an impressive energy density (42.2 Wh kg with 212.2 W kg). Full ZIHSC devices are also found to be efficient in powering light-emitting diodes, further substantiating their feasibility in next-generation energy storage applications.
锌离子混合超级电容器（ZIHSCs）作为下一代高性能储能系统具有真正的潜力，因为它们可以提供像电池一样的高能量密度，同时展现出超级电容器的高功率输出和长循环寿命特性。构建高性能ZIHSC的关键在于将锌阳极与合适的阴极材料相耦合，该阴极材料应具有高理论容量、成本效益和固有安全特性。在这项工作中，我们展示了硫、氮共掺杂多孔碳纳米立方体（S，N-CNCs）作为阴极材料来设计具有优异能量密度和循环寿命的ZIHSC的潜力。S，N-CNCs是由沸石咪唑酯骨架（ZIF）-8前驱体通过在惰性气氛中的同步热解掺杂策略制备而成。所得的CNCs是单分散的，平均尺寸约为65纳米，本质上是多孔的，在整个结构中具有均匀的氮和硫掺杂。受益于这种分级多孔结构和大量杂原子的存在，在硫酸锌水溶液电解质中以S，N-CNC为阴极、锌箔为阳极组装的ZIHSC在1 A g时可达到高达165.5 mA h g（331 F g）的比容量，这对应于在900 W kg的功率密度下148.9 W h kg的令人满意的能量密度。该ZIHSC在10,000次充放电循环后显示出良好的循环稳定性，容量保持率超过70%。此外，为了验证这种阴极材料的实际可行性，制备了一种水性3D Zn@Cu//S，N-CNC全电池装置，其展示了令人满意的比容量（在0.25 A g时为49.6 mAh g）和令人印象深刻的能量密度（在212.2 W kg时为42.2 Wh kg）。还发现完整的ZIHSC装置在为发光二极管供电方面效率很高，进一步证实了它们在下一代储能应用中的可行性。
