delta-MnO2/holey graphene hybrid fiber for all-solid-state supercapacitor
delta-MnO2/holey graphene hybrid fiber for all-solid-state supercapacitor
复制标题
用于全固态超级电容器的δ-MnO2/多孔石墨烯混合纤维
DOI：
10.1039/c6ta02989b
复制
发表时间：
2016
影响因子：
11.9
通讯作者：
Liu Zong-Huai
中科院分区：
文献类型：
--
作者：
Zhang Jinyang;Yang Xiaofan;He Yibo;Bai Yonglong;Kang Liping;Xu Hua;Shi Feng;Lei Zhibin;Liu Zong-Huai
通过在多孔还原氧化石墨烯纤维表面沉积δ-MnO 2，制备出具有良好柔性和增强电化学性能的δ-MnO 2/多孔还原氧化石墨烯（HRGO）纤维电极。HRGO-650通过将氧化石墨烯在0.5M H3 PO 4溶液中浸泡12小时，然后在N2中在650 °C下煅烧2小时来获得。松散卷曲的氧化锰纳米片在HRGO-650纤维表面自由重组，使氧化锰纳米片与石墨烯纳米片紧密接触。制备的δ-MnO 2（4.0）/HRGO纤维电极在1 M Na 2SO 4电解质中在1 A g-1的电流密度下显示出较大的比电容（245 F g-1）。将两个缠绕的δ-MnO 2（4.0）/HRGO纤维电极在H3 PO 4-聚乙烯醇（PVA）凝胶电解质中固化，组装成全固态纤维超级电容器。这种全固态δ-MnO 2（4.0）/HRGO纤维超级电容器不仅具有良好的柔性，而且还具有增强的电容性能。最佳的全固态δ-MnO 2（4.0）/HRGO纤维超级电容器在0.05 mA cm−2的电流密度下获得了高的面积比电容（16.3-16.7 mF cm− 2）、增强的倍率性能（0.05-0.6 mA cm−2的64%电容保持率）和相对良好的稳定性（1000次循环后为初始电容值的80%）。该方法有望提高全固态碳基纤维超级电容器的电导率和电容量，具有良好的柔性和重量轻。
δ-MnO2/holey reduced graphene oxide (HRGO) fiber electrodes with good flexibility and enhanced electrochemical performance were prepared by depositing δ-MnO2 on the surface of the holey reduced graphene oxide fibers. HRGO-650 was obtained by soaking graphene oxide in a 0.5 M H3PO4 solution for 12 h followed by calcining it at 650 °C for 2 h in N2. The loose curling manganese oxide nanosheets are reassembled on the surface of the HRGO-650 fiber freely, causing the close contact between the manganese oxide nanosheets and the graphene nanosheets. The prepared δ-MnO2(4.0)/HRGO fiber electrode shows a larger specific capacitance (245 F g−1) at a current density of 1 A g−1 in the 1 M Na2SO4 electrolyte. An all-solid-state fiber supercapacitor was assembled by two intertwined δ-MnO2(4.0)/HRGO fiber electrodes, both of which are solidified in a H3PO4–polyvinyl alcohol (PVA) gel electrolyte. This all-solid-state δ-MnO2(4.0)/HRGO fiber supercapacitor not only shows good flexibility, but also gives enhanced capacitive performance. The optimal all-solid-state δ-MnO2(4.0)/HRGO fiber supercapacitor obtains a high area-specific capacitance (16.3–16.7 mF cm−2) at a current density of 0.05 mA cm−2, enhanced rate capability (64% capacitance retention from 0.05–0.6 mA cm−2), and relative good stability (80% of initial capacitance values after 1000 cycles). This method is expected to improve the conductivity and capacitance for all-solid-state carbon-based fiber supercapacitor with good flexibility and light weight.