Cherusseri Jayesh, Thomas Susmi Anna, Pandey A K, Zaed M A, Farhana N K, Saidur R
Research Centre for Nanomaterials and Energy Technology (RCNMET), School of Engineering and Technology, Sunway University, No. 5, Jalan Universiti, Bandar Sunway, 47500, Darul Ehsan, Selangor, Malaysia.
School of Engineering and Technology, Sunway University, No. 5, Jalan Universiti, Bandar Sunway, 47500, Darul Ehsan, Selangor, Malaysia.
Sci Rep. 2024 Nov 4;14(1):26550. doi: 10.1038/s41598-024-77278-w.
Electrochemical energy storage devices with high specific capacity are of utmost important for the next-generation electronic devices. Supercapatteries (SCs) are highly demanded energy storage devices nowadays as these bridge the low energy supercapacitors and low power batteries. Herein, we report a rapid synthesis of cobalt manganese phosphate (COMAP) by microwave-assisted hydrothermal method and facile fabrication of SCs using electrodes comprising of COMAP as positrode material. The effect of precursor concentration on the microstructure and surface morphology of the COMAP samples are examined initially. Further, the electrochemical performance of COMAP electrodes is studied systematically in 3 M KOH (aqueous) electrolyte. COMAP exhibits excellent charge storage capabilities where type of charge storage mechanism is found to be battery-type based on the calculation obtained from Dunn's method. The SC electrode fabricated with COMAP synthesized using cobalt: manganese precursor ratio as 80:20 exhibits a highest specific capacity of 191.4 C/g at a scan rate of 1 mV/s. An asymmetric SC (ASC) cell fabricated with COMAP as positrode and activated carbon (AC) as negatrode exhibits a specific capacity of 165.5 C/g at a current density of 1.8 A/g. The COMAP//AC ASC cell exhibits an energy density of 34.1 Wh/kg at a corresponding power density of 1875 W/kg at a current density of 1.8 A/g.
具有高比容量的电化学储能器件对于下一代电子设备至关重要。超级电容器（SCs）是当今急需的储能器件，因为它们弥补了低能量超级电容器和低功率电池之间的差距。在此，我们报告了通过微波辅助水热法快速合成磷酸钴锰（COMAP），以及使用由COMAP作为正极材料的电极简便制备超级电容器。首先研究了前驱体浓度对COMAP样品微观结构和表面形貌的影响。此外，在3M KOH（水性）电解质中系统地研究了COMAP电极的电化学性能。基于从邓恩方法获得的计算结果，COMAP表现出优异的电荷存储能力，其中电荷存储机制类型被发现为电池型。使用钴：锰前驱体比例为80：20合成的COMAP制备的超级电容器电极在扫描速率为1mV/s时表现出最高比容量191.4C/g。以COMAP作为正极和活性炭（AC）作为负极制备的不对称超级电容器（ASC）电池在电流密度为1.8A/g时表现出比容量165.5C/g。COMAP//AC ASC电池在电流密度为1.8A/g时，在相应功率密度为1875W/kg时表现出能量密度34.1Wh/kg。
