Fabricating hierarchically porous carbon with well-defined open pores via polymer dehalogenation for high-performance supercapacitor
Fabricating hierarchically porous carbon with well-defined open pores via polymer dehalogenation for high-performance supercapacitor
复制标题
通过聚合物脱卤制备具有明确开孔的分级多孔碳用于高性能超级电容器
DOI：
10.1016/j.apsusc.2018.01.215
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发表时间：
2018-05-15
影响因子：
6.7
通讯作者：
Zhang, Guoxin
中科院分区：
文献类型：
--
作者：
Guo, Mei;Li, Yu;Zhang, Guoxin
提高高功率超级电容器（SC）的比能量已成为一个热门且具有挑战性的课题。在这项工作中，通过聚氟乙烯 (PVDF) 与 NaNH2 的脱卤反应，报道了具有明确介孔/大孔的分级多孔碳 (HPC) 材料。孔隙层次结构的实现主要是由于 NaNH2 活化以及 NaF 和 NH3 副产物的模板/鼓泡效应的耦合效应。电子显微镜研究和 Brunauer-Emme tt-Teller (BET) 测量证实，HPC 样品的结构包含以分层模式组装的多尺度孔，并且其大部分体积由中孔贡献。采用HPC-M7材料制备水性对称超级电容器(ASSC)，在比功率986.8 W kg(-1)时实现了18.8 Wh kg(-1)的超高比能量。值得注意的是，在14.3 kW kg(-1)的超高功率下，HPC-ASSC仍然输出16.7 Wh kg(-1)的极高比能量，这意味着ASSC可以在4 s内充电或放电。出色的倍率电容性能主要得益于分层多孔结构，可实现高效的离子扩散。 (C) 2018 Elsevier B.V. 保留所有权利。
Improving specific energy of supercapacitors (SCs) at high power has been intensively investigated as a hot and challengeable topic. In this work, hierarchically porous carbon (HPC) materials with well-defined meso-/macro-pores are reported via the dehalogenation reaction of polyvinyl fluoride (PVDF) by NaNH2. The pore hierarchy is achievable mainly because of the coupled effects of NaNH2 activation and the template/bubbling effects of byproducts of NaF and NH3. Electron microscopy studies and Brunauer-Emme tt-Teller (BET) measurements confirm that the structures of HPC samples contain multiple-scale pores assembled in a hierarchical pattern, and most of their volumes are contributed by mesopores. Aqueous symmetric supercapacitors (ASSCs) were fabricated using HPC-M7 materials, achieving an ultrahigh specific energy of 18.8 Wh kg(-1) at specific power of 986.8 W kg(-1) . Remarkably, at the ultrahigh power of 14.3 kW kg(-1) , the HPC-ASSCs still output a very high specific energy of 16.7 Wh kg(-1) , which means the ASSCs can be charged or discharged within 4 s. The outstanding rate capacitive performance is mainly benefited from the hierarchical porous structure that allows highly efficient ion diffusion. (C) 2018 Elsevier B.V. All rights reserved.