Bioinspired flavin analogues as organic electrode materials for supercapacitor applications†

IF 3.2 Q2 CHEMISTRY, PHYSICAL
Energy advances Pub Date : 2024-06-05 DOI:10.1039/D4YA00001C
Dipayan Mondal, Ishita Naskar, Melepurath Deepa and Ashutosh Kumar Mishra
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Abstract

With the increasing interest in incorporating redox-active organic molecules as potential materials in energy storage systems, we envisaged a chemical design of a naturally occurring redox-active flavin moiety. Herein, we report the fabrication and characterization of asymmetric supercapacitors (ASCs) based on modified flavins as cathode materials. Notably, subtle chemical modification with the incorporation of a carboxylic functionality around the flavin core (cFl) was found to impart superior ion-storage properties compared to a simple flavin derivative (Fl). As determined, the specific capacitance (SC) for cFl and Fl as individual electrodes was found to be 170 and 62 F g−1, respectively, whereas in a two electrode ASC with activated carbon serving as the anode, the SC was found to be 107 and 29 F g−1, respectively, at a current density of 1.25 A g−1. With better cycling stability (retaining 87% of its initial SC in the case of cFl) and significantly higher energy density (38 W h kg−1 for cFl) as compared to most of the known organic material-based electrodes, the modified flavin derivatives serve as better organic electrode alternatives for practical energy storage applications.

Abstract Image

生物启发黄素类似物作为超级电容器应用的有机电极材料
随着人们对将氧化还原活性有机分子作为储能系统潜在材料的兴趣日益浓厚,我们设想了一种围绕天然氧化还原活性黄素分子的化学设计。在此,我们报告了基于改性黄素阴极材料的不对称超级电容器(ASCs)的制造和表征。值得注意的是,与简单的黄素衍生物(Fl)相比,通过在黄素核心(cFl)周围加入羧基官能团进行微妙的化学修饰,可赋予其卓越的离子存储特性。经测定,作为单独电极的 cFl 和 Fl 的比电容(SC)分别为 170 和 62 F g-1;而在以活性炭为阳极的双电极 ASCs 中,电流密度为 1.25 A g-1 时,比电容(SC)分别为 107 和 29 F g-1。与大多数已知的基于有机材料的电极相比,改性黄素衍生物具有更好的循环稳定性(cFl 可保持 94% 的初始 SC)和更高的能量密度(cFl 可保持 38 Wh kg-1),是实际储能应用中更好的有机电极替代品。
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CiteScore
1.80
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