School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China.
Dalton Trans. 2018 Jul 3;47(26):8676-8682. doi: 10.1039/c8dt01375f.
The structure and morphology of titanium carbide (Ti3C2Tx) MXene, a new class of two dimensional (2D) materials, are investigated and reported. Ti3AlC2 MAX, treated with a hydrofluoric acid etching process, is used as a promising electrode material for electrochemical supercapacitor studies. The electrochemical supercapacitor performance of Ti3C2Tx as a negatrode in a natural seawater electrolyte solution, tested in a three-electrode system, demonstrated a specific capacitance of 67.7 F g-1 at a current density of 1 A g-1 which is in accordance with the volumetric specific capacitance of 121.8 F cm-3. A symmetric supercapacitor assembled with a Ti3C2Tx//Ti3C2Tx electrode configuration revealed a volumetric specific capacitance of 27.4 F cm-3 at 0.25 A g-1, and 96.6% capacitance retention even after 5000 cycles, which is superior to those reported previously in similar systems, suggesting the importance of abundant and cost-effective seawater as a natural electrolyte in developing energy storage devices.
研究并报道了碳化钛（Ti3C2Tx）MXene 这种新型二维（2D）材料的结构和形态。使用氢氟酸刻蚀工艺处理 Ti3AlC2 MAX 作为电化学超级电容器研究的一种有前途的电极材料。在三电极系统中，在天然海水电解质溶液中作为负极的 Ti3C2Tx 的电化学超级电容器性能测试表明，在电流密度为 1 A g-1 时的比电容为 67.7 F g-1，与 121.8 F cm-3 的体积比电容相符。组装成 Ti3C2Tx//Ti3C2Tx 电极结构的对称超级电容器在 0.25 A g-1 时的体积比电容为 27.4 F cm-3，即使在 5000 次循环后，电容保持率仍为 96.6%，优于先前在类似系统中的报道，这表明丰富且经济实惠的海水作为天然电解质在开发储能器件中的重要性。
