Shirvani Majid, Hosseiny Davarani Saied Saeed
Department of Chemistry, Shahid Beheshti University, G. C., 1983963113, Evin, Tehran, Iran.
Dalton Trans. 2022 Sep 13;51(35):13405-13418. doi: 10.1039/d2dt02058k.
Design and fabrication of impressive and novel electrode materials for energy storage devices, especially supercapacitors, are of great importance. Herein, bimetallic CoSe/FeSe hollow nanocuboid nanostructures derived from Co/Fe-Prussian Blue analogues (denoted as CoSe/FeSe HNCs) are successfully designed and fabricated as a remarkable positive electrode material for high-performance supercapacitors. The bimetallic CoSe/FeSe HNC nanostructures can have increased active sites and short electron-ion diffusion pathways. Bimetallic CoSe/FeSe HNCs@NiF as a positive electrode showed efficient supercapacitive properties with a great specific capacity of 332.75 mA h g (1197.90 C g) at 1 A g, retaining 80.61% of its initial capacity at 20 A g, considerable longevity (91.47% of its initial capacity after 10 000 cycles) and an excellent coulombic efficiency of 98.49%. Also, the designed and fabricated CoSe/FeSe HNCs@NiF||AC@NiF hybrid supercapacitor device using bimetallic CoSe/FeSe HNCs@NiF (positive electrode) and activated carbon@NiF (AC, negative electrode) exhibited an efficient energy density of 63.62 W h kg and a superior durability of 91.14% after 10 000 cycles.
设计和制造用于储能设备，特别是超级电容器的令人印象深刻的新型电极材料具有重要意义。在此，成功设计并制造了源自钴/铁普鲁士蓝类似物的双金属CoSe/FeSe中空纳米立方结构（表示为CoSe/FeSe HNCs），作为高性能超级电容器的卓越正极材料。双金属CoSe/FeSe HNC纳米结构可增加活性位点并缩短电子-离子扩散路径。双金属CoSe/FeSe HNCs@NiF作为正极，在1 A g时表现出高效的超级电容性能，比容量高达332.75 mA h g（1197.90 C g），在20 A g时仍保留其初始容量的80.61%，具有相当长的寿命（10000次循环后为其初始容量的91.47%）和98.49%的优异库仑效率。此外，使用双金属CoSe/FeSe HNCs@NiF（正极）和活性炭@NiF（AC，负极）设计并制造的CoSe/FeSe HNCs@NiF||AC@NiF混合超级电容器装置，在10000次循环后表现出63.62 W h kg的高效能量密度和91.14%的卓越耐久性。
