Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.
Department of Chemical Engineering, Kangwon National University , 346 Joongang-ro, Samcheok, Gangwon-do 25913, Republic of Korea.
Langmuir. 2017 May 30;33(21):5140-5147. doi: 10.1021/acs.langmuir.7b00589. Epub 2017 May 16.
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 MnO nanowires and hemp-derived activated carbon (HC). Vertical MnO 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 at 1 A g with a high rate capability (88% retention) of the 3D MnO/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 MnO/HC as the cathode are able to store 33.3 Wh kg of energy and have a power delivery of 14.8 kW kg.
基于废生物质的分层 3D 纳米结构因其可加工性、多功能性、环境友好性和低成本而被作为储能的有前途的材料。在这里，我们报告了一种简便、廉价且可扩展的策略，用于制造分层多孔 3D 结构作为超级电容器的电极材料，该结构基于 MnO 纳米线和麻衍生的活性炭 (HC)。通过一步水热法将垂直 MnO 线均匀沉积在 HC 表面上，以产生具有导电互连 3D 网络的分层多孔结构。HC 作为近乎理想的 3D 集流器并固定电活性材料，这赋予了 3D MnO/HC 复合材料 340 F g 的比电容，在 1 A g 时具有高倍率性能（88%的保留率），这是由于其开式孔系统有利于离子和电子传输以及两种储能材料的协同贡献。此外，使用 3D HC 作为阳极和 3D MnO/HC 作为阴极制造的非对称超级电容器能够存储 33.3 Wh kg 的能量，并且具有 14.8 kW kg 的功率输送。
