超级电容器
重量分析
电容
电解质
多金属氧酸盐
四乙基铵
化学
电极
化学工程
材料科学
磷钨酸
分析化学(期刊)
有机化学
催化作用
物理化学
工程类
钾
作者
Jun‐Jie Zhu,Hemesh Avireddy,Jordi Jacas Biendicho,Luis Martinez-Soria,Daniel Rueda-García,Joan Ramón Morante,Belén Ballesteros,Pedro Gómez‐Romero
标识
DOI:10.1016/j.jcis.2022.04.170
摘要
We report a triple hybrid electrode (MXene/activated carbon (AC)/polyoxometalates (POMs)) combining the merits of three materials: MXene (high volumetric capacitance), AC (high gravimetric capacitance) and Phosphotungstate (fast redox). Phosphotungstic acid (HPW12) and tetraethylammonium phosphotungstate (TEAPW12) were the two POMs used to prepare MXene/AC/POMs triple hybrids. MXene/AC/TEAPW12 outperformed MXene/AC/HPW12 in 1 M tetraethylammonium tetrafluoroborate (TEABF4)/acetonitrile. Nano-dispersion of POMs facilitates charge storage through surface capacitive processes (91% at 2 mV s−1). MXene/AC/TEAPW12 delivered significantly higher gravimetric capacitance (87F g−1 at 1 mV s−1) than MXene (40F g−1 at 1 mV s−1) in the same organic electrolyte, without sacrificing much volumetric capacitance (less than 10%). The gravimetric capacitance of the triple hybrid was similar to that of MXene/AC, whereas its volumetric capacitance was 1.5 times higher. Replacing TEA cations with 1-ethyl-3-methylimidazolium cations (EMIM+), the capacitance improved by 21%. Coupled with AC positive electrodes in an asymmetric cell, MXene/AC/TEAPW12 delivered 4.6 times higher gravimetric energy density and 3.5 times higher volumetric energy density than a similar MXene asymmetric cell at relatively high-power densities. This study proves that MXene/AC/TEAPW12 combines the merits and compensates for the demerits of each component and is a promising electrode material for organic-electrolyte supercapacitors.
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