Achieving high-energy-density and ultra-stable zinc-ion hybrid supercapacitors by engineering hierarchical porous carbon architecture
Achieving high-energy-density and ultra-stable zinc-ion hybrid supercapacitors by engineering hierarchical porous carbon architecture
复制标题
通过设计分层多孔碳结构实现高能量密度和超稳定的锌离子混合超级电容器
DOI：
10.1016/j.electacta.2019.134999
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发表时间：
2019-12-10
影响因子：
6.6
通讯作者：
Liang, Yeru
中科院分区：
文献类型：
--
作者：
Yu, Peifeng;Zeng, Yuan;Liang, Yeru
锌离子混合超级电容器综合了电池和超级电容器的优点，是一种很有前途的储能装置。然而，低能量密度和差的循环稳定性的阴极诱导的挑战阻碍了锌离子混合超级电容器的实际应用。为了解决这些问题，提出了一种基于水热辅助分子尺度混合策略的碳质阴极结构工程，使其成为分级多孔结构。所制备的分级多孔碳的关键结构包括高比表面积、良好互连的分级多孔形态和良好的石墨化度以及良好的导电性，这为高性能锌离子存储提供了巨大的概念和技术潜力。研究表明，高比表面积为锌离子储存提供了足够的活性位点，而有价值的分级多孔结构和高电导率有利于锌离子的快速转移/扩散。分级多孔炭作为锌离子混合超级电容器的阴极时，可实现305 mAh g（-1）的比容量、118 Wh kg（-1）的高能量密度、良好的倍率性能和在2A g（-1）的高电流密度下20000次循环后超过94.9%的优异循环稳定性。(C)2019爱思唯尔有限公司版权所有。
Zinc-ion hybrid supercapacitor emerges as a promising energy storage device in benefit of the merits from both battery and supercapacitor. However, the challenges induced by the low energy density and poor cycling stability of the cathodes hinder the practical applications of zinc-ion hybrid supercapacitors. To address these issues, a structural engineering of carbonaceous cathode into a hierarchical porous architecture based on a hydrothermal-assisted molecular-scale mixing strategy is proposed. The key structures of the as-fabricated hierarchical porous carbon consist of high specific surface area, well-interconnected hierarchical porous morphology and favorable graphitization degree with good conductivity, which promises great conceptual and technological potential for high-performance zinc-ion storage. It is demonstrated that the high specific surface area supply sufficient active sites for zinc-ion storage, and collectively, the valuable hierarchical porous structure and high electric conductivity are beneficial for rapid transfer/diffusion of zinc ion. An ultrahigh capacity of 305 mAh g(-1), a high energy density of 118 Wh kg(-1), good rate capability, and excellent cycling stability of over 94.9% after 20000 cycles at a high current density of 2 A g(-1) can be achieved when hierarchical porous carbon is used as the cathode of a zinc-ion hybrid supercapacitor. (C) 2019 Elsevier Ltd. All rights reserved.