Huan Liu, Lei Ding, Xiuli Huang, Lulu Wang, Long Kuai
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引用次数: 0
Abstract
Based on dual carbon targets, it is a clean and efficient utilization to convert coal into high value‐added carbon materials for Zn‐ion hybrid supercapacitor (ZIHSC), coupling high energy density of batteries and high power output of supercapacitors. Herein, a one‐step self‐catalysis‐graphitization approach is developed to fabricate N/O/S co‐doped graphitic hierarchical porous carbon from bituminous coal by taking advantages of the intrinsic heteroatoms for self‐doping, the associated minerals for graphization and KOH activation for hierarchical porosity, contributing to abundant entrapments for Zn2+ capture, express transfer pathway for fast kinetics and sturdy skeleton for long‐term duration and thereby endowing the coin‐type ZIHSC device an ultrahigh capacity of 229.8 mAh g−1 at 0.1 A g−1 with 110.7 mAh g−1 conservation even at a 500‐fold amplified current density, the maximum energy density of 183.2 Wh kg−1 and an outstanding stability of 99.3% over 100,000 cycles at 50 A g−1. Gratifyingly, the soft‐pack ZIHSC device still delivered a capacity of 141.2 mAh g−1 at 0.1 A g−1 and a energy density of 112.3 Wh kg−1 for practicability. The quasi‐solid ZIHSC device also displayed a capacity of 144.7 mAh g−1 at 0.1 A g−1 with a energy density of 115.2 Wh kg−1 plus excellent mechanical flexibility.
基于双碳目标,将煤转化为锌离子混合超级电容器(ZIHSC)的高附加值碳材料,实现电池的高能量密度和超级电容器的高功率输出,是一种清洁高效的利用方法。本文提出了一种一步自催化石墨化方法,利用烟煤自掺杂的杂原子、石墨化的伴生矿物和KOH活化的分层孔隙,制备了N/O/S共掺杂的石墨分层多孔碳,为Zn2+捕获提供了丰富的包裹层。这使得硬币型ZIHSC器件在0.1 A g−1时具有229.8 mAh g−1的超高容量,即使在放大500倍的电流密度下也能保持110.7 mAh g−1,最大能量密度为183.2 Wh kg−1,并且在50 A g−1的10万次循环中具有99.3%的出色稳定性。令人满意的是,软封装ZIHSC器件在0.1 a g−1时仍然提供141.2 mAh g−1的容量和112.3 Wh kg−1的能量密度,具有实用性。准固体ZIHSC器件在0.1 a g−1下的容量为144.7 mAh g−1,能量密度为115.2 Wh kg−1,具有优异的机械灵活性。
期刊介绍:
Small serves as an exceptional platform for both experimental and theoretical studies in fundamental and applied interdisciplinary research at the nano- and microscale. The journal offers a compelling mix of peer-reviewed Research Articles, Reviews, Perspectives, and Comments.
With a remarkable 2022 Journal Impact Factor of 13.3 (Journal Citation Reports from Clarivate Analytics, 2023), Small remains among the top multidisciplinary journals, covering a wide range of topics at the interface of materials science, chemistry, physics, engineering, medicine, and biology.
Small's readership includes biochemists, biologists, biomedical scientists, chemists, engineers, information technologists, materials scientists, physicists, and theoreticians alike.