Ultrathin MnO2 nanoflakes deposited on carbon nanotube networks for symmetrical supercapacitors with enhanced performance
Ultrathin MnO2 nanoflakes deposited on carbon nanotube networks for symmetrical supercapacitors with enhanced performance
复制标题
沉积在碳纳米管网络上的超薄 MnO2 纳米片可用于具有增强性能的对称超级电容器
DOI：
10.1016/j.jpowsour.2016.11.112
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发表时间：
2017
影响因子：
9.2
通讯作者：
Wang Xuefeng
中科院分区：
文献类型：
--
作者：
Sun Peng;Yi Huan;Peng Tianquan;Jing Yuting;Wang Ruijing;Wang Huanwen;Wang Xuefeng
二氧化锰是一种很有前景的电化学超级电容器电极材料，但其较差的电子电导率（10−5∼10−6S cm−1）限制了实际应用的快速充放电速率。在目前的工作中，我们使用化学气相沉积（CVD）方法在柔性镍网上生长高导电碳纳米管（CNT）网络，通过简单的溶液方法在其上沉积MnO2纳米片层，形成分层核壳结构。在优化的质量负载下，所制造的 MnO2nanoflake@CNTs/Ni 网状电极在三电极配置中表现出 1072 F g−1 at 1 A g−1 的高比电容。由于这些核壳电极的优势特征（例如高电导率、直流通路、结构稳定性），基于MnO2@CNTs/Ni网的组装对称超级电容器（SSC）在1M Na2SO4水电解质中具有宽工作电压（2.0V）。最终，组装好的SSC在1000 W kg−1时达到了94.4 Wh kg−1的令人印象深刻的能量密度，在33.6 Wh kg−1时实现了30.2 kW kg−1的高功率密度，它作为低成本、高能量密度和有吸引力的可穿戴储能设备展现了巨大的潜力。
Manganese dioxide is a promising electrode material for electrochemical supercapacitors, but its poor electronic conductivity (10−5∼10−6S cm−1) limits the fast charge/discharge rate for practical applications. In the present work, we use the chemical vapor deposition (CVD) method to grow highly conductive carbon nanotube (CNT) networks on flexible Ni mesh, on which MnO2nanoflake layers are deposited by a simple solution method, forming a hierarchical core-shell structure. Under the optimized mass loading, the as-fabricated MnO2nanoflake@CNTs/Ni mesh electrode exhibits a high specific capacitance of 1072 F g−1at 1 A g−1in three-electrode configuration. Due to advantageous features of these core-shell electrodes (e.g., high conductivity, direct current path, structure stability), the as-assembled symmetric supercapacitor (SSC) based on MnO2@CNTs/Ni mesh has a wide working voltage (2.0 V) in 1 M Na2SO4aqueous electrolyte. Finally an impressive energy density of 94.4 Wh kg−1at 1000 W kg−1and a high power density of 30.2 kW kg−1at 33.6 Wh kg−1have been achieved for the as-assembled SSC, which exhibits a great potential as a low-cost, high energy density and attractive wearable energy storage device.