Scarpa Davide, Cirillo Claudia, Ponticorvo Eleonora, Cirillo Carla, Attanasio Carmine, Iuliano Mariagrazia, Sarno Maria
Department of Physics "E.R. Caianiello", University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, Italy.
NANO_MATES Research Centre, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, Italy.
Materials (Basel). 2023 Jul 28;16(15):5309. doi: 10.3390/ma16155309.
Nowadays, iron (II) selenide (FeSe), which has been widely studied for years to unveil the high-temperature superconductivity in iron-based superconductors, is drawing increasing attention in the electrical energy storage (EES) field as a supercapacitor electrode because of its many advantages. In this study, very small FeSe particles were synthesized via a simple, low-cost, easily scalable, and reproducible solvothermal method. The FeSe particles were characterized using cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) measurements, and electrochemical impedance spectroscopy (EIS), revealing enhanced electrochemical properties: a high capacitance of 280 F/g at 0.5 A/g, a rather high energy density of 39 Wh/kg and a corresponding power density of 306 W/kg at 0.5 A/g, an extremely high cycling stability (capacitance retention of 92% after 30,000 cycles at 1 A/g), and a rather low equivalent series resistance (R) of ~2 Ω.
如今，多年来一直被广泛研究以揭示铁基超导体中高温超导性的硒化亚铁（FeSe），因其诸多优点，作为超级电容器电极在电能存储（EES）领域正受到越来越多的关注。在本研究中，通过一种简单、低成本、易于扩展且可重复的溶剂热法合成了非常小的FeSe颗粒。使用循环伏安法（CV）、恒电流充/放电（GCD）测量和电化学阻抗谱（EIS）对FeSe颗粒进行了表征，结果显示其电化学性能得到增强：在0.5 A/g时电容高达280 F/g，在0.5 A/g时能量密度相当高，为39 Wh/kg，相应的功率密度为306 W/kg，具有极高的循环稳定性（在1 A/g下30,000次循环后电容保持率为92%），以及相当低的等效串联电阻（R），约为2Ω。
