Barua Aditi, Paul Amit
Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal MP 462066 India
RSC Adv. 2020 Jan 8;10(3):1799-1810. doi: 10.1039/c9ra09768f. eCollection 2020 Jan 7.
The intermittency of renewable energy sources has led to the invention of supercapacitors. The variation of temperature impacts their working capability particularly in the regions which are too hot or too cold. Herein, the effect of temperature on the double layer formation and the redox mechanism of hydroquinone adsorbed on multifarious nanoporous carbon (MNC) have been reported. The studies have been carried out in 2 M HSO electrolyte solution within a temperature range of -10 to 50 °C. The maximum specific capacitance of the composite material drops from 319 F g at 50 °C to 213 F g at -10 °C. An equivalent circuit model has been chosen to fit the EIS spectra at the double layer potential and formal potential. Subsequently, an Arrhenius type plot has been constructed to calculate the activation energy of the system which revealed 8.69 and 7.77 kJ mol activation energy at the formal potential and double layer potential respectively. The composite also shows excellent cyclability even at enhanced temperatures, which is a major requirement for the application of these supercapacitors in vehicles and other electrical equipment.
可再生能源的间歇性促使了超级电容器的发明。温度变化会影响其工作性能，尤其是在过热或过冷的地区。在此，已报道了温度对吸附在多种纳米多孔碳（MNC）上的对苯二酚的双层形成和氧化还原机制的影响。研究是在2M HSO电解质溶液中于-10至50°C的温度范围内进行的。复合材料的最大比电容从50°C时的319 F g降至-10°C时的213 F g。已选择一个等效电路模型来拟合双层电位和形式电位下的电化学阻抗谱（EIS）。随后，构建了一个阿累尼乌斯类型的图表来计算系统的活化能，结果表明在形式电位和双层电位下的活化能分别为8.69和7.77 kJ mol。该复合材料即使在升高的温度下也表现出优异的循环性能，这是这些超级电容器应用于车辆和其他电气设备的一个主要要求。
