MnO2 Nanowire/Biomass-Derived Carbon from Hemp Stem for High-Performance Supercapacitors.
MnO2 Nanowire/Biomass-Derived Carbon from Hemp Stem for High-Performance Supercapacitors.
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DOI：
10.1021/acs.langmuir.7b00589
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发表时间：
2017-05
期刊：
影响因子：
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通讯作者：
Minho Yang;Dong Seok Kim;Seok Bok Hong;Jae-Wook Sim;Jinsoo Kim;Seung-Soo Kim;B. Choi
中科院分区：
文献类型：
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作者：
Minho Yang;Dong Seok Kim;Seok Bok Hong;Jae-Wook Sim;Jinsoo Kim;Seung-Soo Kim;B. Choi
基于废弃生物质的分级3D纳米结构由于其可加工性、多功能性、环境效益和低成本而被提供作为有前途的储能材料。在这里，我们报告了一种简单，廉价，可扩展的策略，用于制造分层多孔3D结构作为基于MnO 2纳米线和大麻衍生活性炭（HC）的超级电容器的电极材料。垂直MnO 2线均匀沉积到HC的表面上，使用一步水热法产生具有导电互连的3D网络的分级多孔结构。HC作为一个接近理想的三维集流体和锚定电活性材料，这赋予了一个340 F g-1的比电容在1 A g-1的高倍率性能（88%的保留）的三维MnO 2/HC复合材料，因为它的开孔系统，这有利于离子和电子的传输和两种储能材料的协同作用。此外，使用3D HC作为阳极和3D MnO 2/HC作为阴极制造的不对称超级电容器能够存储33.3Wh kg-1的能量，并且具有14.8kW kg-1的功率输送。
Hierarchical 3D nanostructures based on waste biomass are being offered as promising materials for energy storage due to their processabilities, multifunctionalities, environmental benignities, and low cost. Here we report a facile, inexpensive, and scalable strategy for the fabrication of hierarchical porous 3D structure as electrode materials for supercapacitors based on MnO2 nanowires and hemp-derived activated carbon (HC). Vertical MnO2 wires are uniformly deposited onto the surface of HC using a one-step hydrothermal method to produce hierarchical porous structures with conductive interconnected 3D networks. HC acts as a near-ideal 3D current collector and anchors electroactive materials, and this confers a specific capacitance of 340 F g-1 at 1 A g-1 with a high rate capability (88% retention) of the 3D MnO2/HC composite because of its open-pore system, which facilitates ion and electron transports and synergistic contribution of two energy-storage materials. Moreover, asymmetric supercapacitors fabricated using 3D HC as the anode and 3D MnO2/HC as the cathode are able to store 33.3 Wh kg-1 of energy and have a power delivery of 14.8 kW kg-1.