Fabrication of High-Performance All-Solid-State Asymmetric Supercapacitors Based on Stable alpha-MnO2@NiCo2O4 Core Shell Heterostructure and 3D-Nanocage N-Doped Porous Carbon
Fabrication of High-Performance All-Solid-State Asymmetric Supercapacitors Based on Stable alpha-MnO2@NiCo2O4 Core Shell Heterostructure and 3D-Nanocage N-Doped Porous Carbon
复制标题
基于稳定α-MnO2@NiCo2O4核壳异质结构和3D纳米笼N掺杂多孔碳的高性能全固态非对称超级电容器的制备
DOI：
10.1021/acssuschemeng.7b00279
复制
发表时间：
2017
影响因子：
8.4
通讯作者：
Wang Huijuan
中科院分区：
文献类型：
--
作者：
Ma Zhipeng;Shao Guangjie;Fan Yuqian;Feng Mengya;Shen Dejiu;Wang Huijuan
采用两液相反应法和一步自模板法制备了稳定的α-MnO2纳米线@NiCo2O4纳米片状核壳异质结构和三维纳米笼掺氮高电导多孔碳纳米片。独特的α-MnO2@NiCo2O4异质结构具有稳定的纳米结构、快速的电子传输和众多的离子扩散通道。该电极具有1101Fg-1的高比电容，10 000次循环后循环稳定性为95.8%。此外，通过引入有利于倍率性能的N原子，3D多孔炭具有较大的比表面积、合适的孔结构，特别是高电子传导性。以α-MnO2@NiCo2O4核壳异质结构为正电极，3DN掺杂多孔纳米笼碳为负极，PAAK/KOH凝胶为固体电解液，制备了具有优异电化学性能的全固态对称超级电容器。该超级电容器的扩展工作电位为1.7V，最大能量密度为46.2Wh kg-1，最大功率密度为15.3kW kg-1,2000次循环后容量保持率达90%。
A stable α-MnO2nanowire@NiCo2O4nanosheet core–shell heterostructure and a 3D-nanocage N-doped porous carbon nanosheet with high electrical conductivity are synthesized by a two-solution phase reaction and a facile one-step self-template technique, respectively. The unique α-MnO2@NiCo2O4heterostructure is characterized by a stable nanostructure, fast electron transport, and numerous ion diffusion channels. The electrode exhibits a high specific capacitance of 1101 F g–1, and a cycling stability of 95.8% after 10 000 cycles. Moreover, by introducing N atoms which is favorable for rate performance, the 3D porous carbon offers a large surface area, a proper pore structure and especially high electron conductivity. The specific capacitance of the 3D N-doped porous nanocage carbon electrode reaches 100 F g–1at a current densities as high as 100 A g–1. The all-solid-state symmetric supercapacitor with excellent electrochemical properties is fabricated using the α-MnO2@NiCo2O4core–shell heterostructure as positive electrode, a 3D N-doped porous nanocage carbon as negative electrode, and a PAAK/KOH gel as solid-state electrolyte. The supercapacitor demonstrates an expanded working potential of 1.7 V, a maximum energy density of 46.2 Wh kg–1, a maximum power density of 15.3 kW kg–1, and good capacitance retention of 90% after 2000 cycles.