材料科学
阳极
电容器
阴极
超级电容器
电极
碳纤维
介孔材料
相(物质)
纳米技术
化学工程
电容
复合材料
电压
电气工程
有机化学
生物化学
复合数
工程类
物理化学
催化作用
化学
作者
Rixin Fei,Huanwen Wang,Qiang Wang,Ruyun Qiu,Shasha Tang,Rui Wang,Beibei He,Yansheng Gong,Hong Jin Fan
标识
DOI:10.1002/aenm.202002741
摘要
Abstract Metal‐ion capacitors are being widely studied to reach a balance between power and energy output by combining the merits of conventional batteries and capacitors. The main challenge for Na‐ion capacitors is that the battery‐type anode usually has unsatisfactory power density and long‐term stability since most Na host materials have a poor kinetic and structural stability. Herein, asymmetric hollow bowl‐like carbon (HBC) materials are rationally designed and fabricated through an in situ hard‐template approach. The formation originates from a subtle control of capillary force and the mechanical strength of the carbon shell. The HBCs possess abundant mesopores, high volumes of accessible surface area as well as an open macropore network. As a 3D host, MoSe 2 nanocrystals are anchored onto the HBC matrix by a solid‐phase reaction. The obtained MoSe 2 @HBC nanobowl electrode exhibits pseudocapacitive sodium storage with fast kinetics, improved capacity at high currents, and cycle stability, which is also supported by DFT calculations. Sodium ion capacitor full cells are fabricated using the two bowl‐like architectures (MoSe 2 @HBC as the anode and HBC as the cathode), which deliver high energy and power densities, long cycle life, and a comparably low self‐discharge rate. Moreover, application of the HBC in a zinc‐ion capacitor (ZIC) is also demonstrated.
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