Porous nitrogen-doped MXene-based electrodes for capacitive deionization
Porous nitrogen-doped MXene-based electrodes for capacitive deionization
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DOI：
10.1016/j.ensm.2019.09.013
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发表时间：
2020-03-01
影响因子：
20.4
通讯作者：
Naraghi, Mohammad
中科院分区：
文献类型：
--
作者：
Amiri, Ahmad;Chen, Yijun;Naraghi, Mohammad
提出并证明了一种简单而新颖的工艺来制备高度多孔的氮掺杂MXene片材（N-Ti 3C 2 Tx），其具有很大的海水淡化前景。氮掺杂用于形成具有开孔结构（总孔体积为0.84 cm（3）g（-1））和高比表面积（368.8 m2）g（-1））的骨架，同时阻碍MXene层的重新堆叠并提高电导率。经处理的N-Ti 3C 2 Tx显示出有前景的体积电容（514 F cm（-3）），并且表现出巨大的电化学稳定性，在1 M氯化钠电解质中2，000次循环后保持99.75%的初始体积电容。我们表明，氮掺杂MXene片是一种用于电容去离子（CDI）应用的高电位电极材料，通过考虑两个有效特性（电吸附速率和电容）的组合，其性能优于所有最近报道的材料。N-Ti 3C 2 Tx在24次CDI循环中表现出稳定的性能，在5，000 mg/L NaCl溶液（施加电压为1.2 V）中的平均盐吸附容量为117 +/- 4.7 mg cm（-3）（43.5 +/- 1.7 mg g（-1））。
A facile and novel process is proposed and demonstrated to fabricate highly-porous nitrogen-doped MXene sheets (N-Ti3C2Tx) with great promise for seawater desalination. The nitrogen-doping is used to form a framework with open pore structures (total pore volume of 0.84 cm(3) g(-1)) and high specific surface area (368.8 m(2) g(-1)), simultaneously to hinder the restacking of MXenes layers and to improve electrical conductivity. The processed N-Ti3C2Tx shows promising volumetric capacitance (514 F cm(-3)) and represents tremendous electrochemical stability maintaining 99.75% of the initial volumetric capacitance after 2,000 cycles in 1 M sodium chloride electrolyte. We showed that nitrogen-doped MXene sheet is a high-potential electrode material for capacitive deionization (CDI) application, which outperforms all the recently reported materials by considering a combination of two efficient characteristics: electroadsorption rate and capacitance. The N-Ti3C2Tx shows stable performance over 24 CDI cycles with an average salt adsorption capacity of 117 +/- 4.7 mg cm(-3) (43.5 +/- 1.7 mg g(-1)) in 5,000 mg/L NaCl solution (applied voltage of 1.2 V).