Pseudocapacitive quantum dots confined in sacrificial g-C3N4 derived carbon nanosheets for high performance ionic liquid-based supercapacitors
Pseudocapacitive quantum dots confined in sacrificial g-C3N4 derived carbon nanosheets for high performance ionic liquid-based supercapacitors
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赝电容量子点限制在牺牲 g-C3N4 衍生的碳纳米片中，用于高性能离子液体超级电容器
DOI：
10.1016/j.matlet.2020.127498
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发表时间：
2020
影响因子：
3
通讯作者：
Gao Lian
中科院分区：
文献类型：
--
作者：
Yang Cheng;Liu Jing;Song Xuefeng;Zhao Liping;Zhang Peng;Gao Lian
利用高压离子液体作为电解液组装超级电容器是提高超级电容器能量密度的有效途径。本文提出了一种在IL电解质中具有优异电化学性能的新型赝电容量子点电极。值得注意的是，FeOOH量子点（FQDs）被有效地限制在由石墨化碳（g-C3N4）衍生的多孔n掺杂碳（PNC）支撑的二维（2D）纳米空间中。FQDs/PNC电极具有丰富的活性位点和较高的表面润湿性，在IL电解质中表现出充分的氧化还原反应和良好的电化学动力学。因此，它可以提供210.6 F g−1的大比电容，并且在10,000次循环后仍保持其初始电容的82.2%。
Assembling supercapacitors (SCs) using high-voltage ionic liquid (IL) as electrolyte is an effective strategy to enhance the energy density of SCs. Herein, a novel pseudocapacitive quantum dots (QDs)-based electrode with superior electrochemical behaviors in IL electrolyte has been put forward. Remarkably, FeOOH QDs (FQDs) are effectively confined in a two-dimensional (2D) nanospace supported by porous N-doped carbon (PNC) derived from graphitic carbon nitride (g-C3N4). Beneficial from the abundant active sites and high surface wettability, the resultant FQDs/PNC electrode exhibits sufficient redox reaction and favorable electrochemical kinetics in IL electrolyte. As a result, it can deliver a large specific capacitance of 210.6 F g−1and still retain 82.2% of its initial capacitance after 10,000 cycles.