文献类型：期刊文献

英文题名：MnO₂-decorated flexible carbon nanofibers with controllable hierarchical porous nanostructures for high energy density supercapacitors

作者：Luo, Yongmei Li, Junqi Chen, Chaoyi Liu, Wei Yan, Xiang

第一作者：Luo, Yongmei;罗咏梅

通信作者：Li, JQ[1];Chen, CY[1];Liu, W[2]

机构：[1]Guizhou Univ, Sch Mat & Met, Guiyang 550025, Peoples R China;[2]Guizhou Inst Technol, Guiyang 550025, Peoples R China;[3]CSIC CEI UAM CSIC Isaac Newton, Inst Micro & Nanotecnol, IMN CNM, Isaac Newton 8, E-28760 Madrid, Spain

第一机构：Guizhou Univ, Sch Mat & Met, Guiyang 550025, Peoples R China

通信机构：corresponding author), Guizhou Univ, Sch Mat & Met, Guiyang 550025, Peoples R China;corresponding author), Guizhou Inst Technol, Guiyang 550025, Peoples R China.|贵州理工学院;

年份：2024

卷号：55

外文期刊名：SURFACES AND INTERFACES

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001344682600001)】；

基金：This work was funded by National Natural Science Foundation of China (52274260, 52164017, 52074096, 52263004) , Guizhou Provincial Science and Technology Projects GCC ( [2023] 017) , Innovative young scientific and technological talents training projects of Guiyang City (Zhu Ke He Tong [2024] 2-12) , Guizhou Provincial Science and Technology Projects (Qian Ke He Ji Chu-ZK [2022] YiBan179) , Research Program of the Science and Technology Department of Guizhou Province (Qian ke he Jichu [2019] 1418, Qian ke he Ji chu [2019] 1147) .

语种：英文

外文关键词：Electrospinning; Carbon nanofibers; Hierarchical porous structure; Supercapacitors

摘要：Constructing hierarchical porous structures and reducing material size enhance the electrochemical efficiency of porous carbon-based electrodes. In this study, ultrafine hierarchical porous carbon-based nanofibers were synthesized via electrospinning a blend of polyacrylonitrile, polymethyl methacrylate (PMMA), and zinc acetate dihydrate (ZAH), followed by pre-oxidation, carbonization, and acid washing. Adjusting the ZAH content allowed precise control of fiber diameters (300-600 nm) and promoted significant hierarchical porous structures, achieving an optimal mesopore to micropore ratio (1.65) and a high specific surface area (SSA) of 599 m2/g. MnO2 nanosheets were in-situ modified on the carbon nanofibers, forming a hybrid electrode (MnO2@HPCNFs) with excellent flexibility, high SSA value, and rich pore structure. This electrode demonstrated a specific capacitance value equal to 1035 F/g at 0.5 A/g and maintained 80.7% capacitance at 10 A/g. The assembled asymmetric supercapacitor achieved an energy density of 54.81 Wh/kg. This study presents new possibilities for binder-free, self-supporting electrodes in electrochemical energy storage devices.