超级电容器
热液循环
氟
质子
电极
水热合成
过程(计算)
化学
材料科学
化学工程
纳米技术
电化学
有机化学
计算机科学
工程类
物理
物理化学
量子力学
操作系统
作者
Ubaid Khan,Bowen Gao,Ling Bing Kong,Zhong Chen,Wenxiu Que
标识
DOI:10.1016/j.electacta.2023.143651
摘要
The electrochemical properties of carbides and nitrides dominated two dimensional MXenes can be effectively engineered for a wide variety of applications. Herein, we report a hydrothermal Alkali etching process to prepare Ti3C2Tx@Al-NaOH (Tx= -OH, -O) MXene without fluorine from Sodium hydroxide (NaOH) and MAX solution. The Ti3C2Tx@Al-NaOH sample etched for 15 h in NaOH solution exhibits optimal electrochemical properties. Also, the Ti3C2Tx@Al-NaOH samples, which have NaOH concentrations of 22.5, 25, 30, 35 and 40 M, respectively, show higher rates of charge-discharge and pseudocapacitive effect in 1 M sulfuric acid electrolyte solution, while the corresponding specific capacity values are 378, 445, 565, 365 and 176 Cg−1, respectively. Meanwhile, their retention rates are still retained at 94 %, 119 %, 150 %, 113 % and 29 %, after continuous cycling of about 8000 times. It is demonstrated that the Ti3C2TX@Al-NaOH (30 M) for 15 h shows great potential as a candidate electrode for supercapacitors and other energy storage devices, since its capacitance value surpasses (by ∼465 %) to that of the multilayer Ti3C2Tx MXene prepared via normal hydrofluoric acid etching. As a consequence, our Alkali-assisted hydrothermal reaction treatment is a highly advantageous process to realize fine-tune of surface chemistry.
科研通智能强力驱动
Strongly Powered by AbleSci AI