Au通过Å尺度通道掺杂α-MnO2纳米晶体构成的三维电极纳米材料的超高电容性能,Nano Energy

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Au通过Å尺度通道掺杂α-MnO2纳米晶体构成的三维电极纳米材料的超高电容性能
Nano Energy ( IF 16.8 ) Pub Date : 2016-01-14 02:08:34
Qiying Lv, Hongyu Sun, Xibo Li, Junwu Xiao, Fei Xiao, Limin Liu, Jun Luo, Shuai Wang

金属氧化物的导电性差是限制其能量存储能力的主要挑战。预期将金属原子插入金属氧化物的晶格中会改变金属氧化物的电子结构，从而改善金属氧化物的电导率以及电化学性能。在本文中，我们证明α-MnO的的掺杂_2个纳米晶由金通过一个大规模通道通过循环伏安法在第一原理计算的基础上的不同扫描速率。实验阐明掺杂的α-MnO的Au原子₂晶格和分布的Au纳米颗粒的α-MnO的₂ nanothin层可以大大提高的MnO的电导率和电化学性能₂。因此，与ZnO的纳米棒改性所设计的碳布电极/ Au的掺杂-α-MnO的₂的（ZnS / ADM）纳米复合材料显示出优异的电化学性能。此外，基于ZNs / ADM（正）和氧化石墨烯-CNTs（负）杂化材料的不对称超级电容器在宽电位窗中可逆循环，并显示出高能量密度（101Wh / kg），功率密度（33.6kW） / kg），以及合理的循环性能。这项工作为开发新型的金属掺杂的金属氧化物提供了可能，这些金属氧化物可以满足特定应用的需求，从能量存储设备到生物传感器。

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Ultrahigh Capacitive Performance of Three-Dimensional Electrode Nanomaterials Based on α-MnO2 Nanocrystallines Induced by Doping Au through Å-Scale Channels

Poor electrical conductivity of metal oxides is the primary challenge that limits their energy storage capacity. Intercalating metal atoms into the crystal lattices of metal oxides is expected to change the electronic structure of metal oxides, and thus improve the conductivity as well as electrochemical performance of the metal oxides. Herein, we demonstrate the doping of α-MnO₂ nanocrystallines by Au through Å-scale channels via cyclic voltammetry at different scan rates on the basis of first-principle calculation. Experiments elucidate that the doped Au atoms in α-MnO₂ lattice and distributed Au nanoparticles in α-MnO₂ nanothin layers can greatly enhance the conductivity and electrochemical performance of MnO₂. Hence, the designed carbon cloth electrodes modified with ZnO-nanorods/Au-doped-α-MnO₂ (ZNs/ADM) nanocomposites exhibit excellent electrochemical performances. Moreover, an asymmetric supercapacitor based on ZNs/ADM (positive) and reduced-graphene-oxide-CNTs (negative) hybrid materials demonstrates cycled reversibly in a wide potential window and exhibits high energy density (101Wh/kg), power density (33.6kW/kg), and reasonable cycling performance. This work opens the possibility to develop new types of metal-doped metal-oxides that can meet the needs of specific applications, ranging from energy-storage devices to biosensors.

更新日期：2016-01-14

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