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Black titania nanotubes/spongy graphene nanocomposites for high-performance supercapacitors

机译：黑色二氧化钛纳米管/海绵状石墨烯纳米复合材料，用于高性能超级电容器

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摘要

A simple method is demonstrated to prepare functionalized spongy graphene/hydrogenated titanium dioxide (FG-HTiO _(2) ) nanocomposites as interconnected, porous 3-dimensional (3D) network crinkly sheets. Such a 3D network structure provides better contact at the electrode/electrolyte interface and facilitates the charge transfer kinetics. The fabricated FG-HTiO _(2) was characterized by X-ray diffraction (XRD), FTIR, scanning electron microscopy (FESEM), Raman spectroscopy, thermogravimetric analysis (TGA), UV-Vis absorption spectroscopy, and transmission electron microscopy (TEM). The synthesized materials have been evaluated as supercapacitor materials in 0.5 M H _(2) SO _(4) using cyclic voltammetry (CV) at different potential scan rates, and galvanostatic charge/discharge tests at different current densities. The FG-HTiO _(2) electrodes showed a maximum specific capacitance of 401 F g ~(?1) at a scan rate of 1 mV s ~(?1) and exhibited excellent cycling retention of 102% after 1000 cycles at 100 mV s ~(?1) . The energy density was 78.66 W h kg ~(?1) with a power density of 466.9 W kg ~(?1) at 0.8 A g ~(?1) . The improved supercapacitor performance could be attributed to the spongy graphene structure, adenine functionalization, and hydrogenated titanium dioxide.
机译：证明了一种简单的方法，用于制备官能化海绵烯/氢化二氧化钛（FG-HTIO _（2））纳米复合材料，如互连的多孔三维（3D）网络划线板。这种3D网络结构在电极/电解质界面提供更好的接触，并有助于电荷转移动力学。由X射线衍射（XRD），FTIR，扫描电子显微镜（FESEM），拉曼光谱，热重分析（TGA），UV-Vis吸收光谱和透射电子显微镜（TEM ）。合成材料已在不同电位扫描速率下使用循环伏安法（CV）和不同电流密度的循环伏安法（CV）评估为0.5Mh _（2）所以的超级电容器材料。 FG-HTIO _（2）电极以1mV S〜（β1）的扫描速率显示为401f g〜（α1）的最大特异性电容，并且在100 mV下1000次循环后表现出优异的循环保留102％ s〜（？1）。能量密度为78.66WH kg〜（α1），功率密度为466.9Wkg〜（α1），0.8 a g〜（α1）。改善的超级电容器性能可归因于海绵状石墨烯结构，腺嘌呤官能化和二氧化钛。

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