Hossain S K Safdar, Dey Baban, Ali Syed Sadiq, Choudhury Arup
Department of Chemical Engineering, College of Engineering, King Faisal University, P.O. Box 380, Al-Ahsa 31982, Saudi Arabia.
Department of Chemical Engineering, Birla Institute of Technology, Ranchi 835215, India.
Nanomaterials (Basel). 2023 Feb 6;13(4):642. doi: 10.3390/nano13040642.
In this study, poly(-aminophenol) (PmAP) has been investigated as a multi-functional conductive supercapacitor binder to replace the conventional non-conductive binder, namely, poly(vinylene difluoride) (PVDF). The kye benefits of using PmAP are that it is easily soluble in common organic solvent and has good film-forming properties, and also its chemical functionalities can be involved in pseudocapacitive reactions to boost the capacitance performance of the electrode. A new ternary nanocomposite film based on vanadium pentoxide (VO), amino-functionalized graphene (amino-FG) and PmAP was fabricated via hydrothermal growth of VO nanoparticles on graphene surfaces and then blending with PmAP/DMSO and solution casting. The electrochemical performances of VO/amino-FG/PmAP nanocomposite were evaluated in two different electrolytes, such as KCl and LiSO, and compared with those of VO/amino-FG nanocomposite with PVDF binder. The cyclic voltametric (CV) results of the VO/amino-FG/PmAP nanocomposite exhibited strong pseudocapacitive responses from the VO and PmAP phases, while the faradaic redox reactions on the VO/amino-FG/PVDF electrode were suppressed by the inferior conductivity of the PVDF. The VO/amino-FG/PmAP electrode delivered a 5-fold greater specific capacitance than the VO/amino-FG/PVDF electrode. Solid-state asymmetric supercapacitors (ASCs) were assembled with VO/amino-FG/PmAP film as a positive electrode, and their electrochemical properties were examined in both KCl and LiSO electrolytes. Although the KCl electrolyte-based ASC has greater specific capacitance, the LiSO electrolyte-based ASC delivers a higher energy density of 51.6 Wh/kg and superior cycling stability.
在本研究中，聚（对氨基酚）（PmAP）已被研究作为一种多功能导电超级电容器粘合剂，以取代传统的非导电粘合剂，即聚（偏二氟乙烯）（PVDF）。使用PmAP的主要优点是它易溶于常见有机溶剂且具有良好的成膜性能，并且其化学官能团可参与赝电容反应以提高电极的电容性能。通过在石墨烯表面水热生长五氧化二钒（VO）纳米颗粒，然后与PmAP/二甲基亚砜混合并溶液浇铸，制备了一种基于五氧化二钒（VO）、氨基功能化石墨烯（氨基-FG）和PmAP的新型三元纳米复合薄膜。在两种不同的电解质（如KCl和LiSO）中评估了VO/氨基-FG/PmAP纳米复合材料的电化学性能，并与具有PVDF粘合剂的VO/氨基-FG纳米复合材料的电化学性能进行了比较。VO/氨基-FG/PmAP纳米复合材料的循环伏安（CV）结果显示出VO和PmAP相的强赝电容响应，而PVDF的低导电性抑制了VO/氨基-FG/PVDF电极上的法拉第氧化还原反应。VO/氨基-FG/PmAP电极的比电容比VO/氨基-FG/PVDF电极高5倍。以VO/氨基-FG/PmAP薄膜为正极组装了固态非对称超级电容器（ASC），并在KCl和LiSO电解质中研究了它们的电化学性能。尽管基于KCl电解质的ASC具有更大的比电容，但基于LiSO电解质的ASC提供了51.6 Wh/kg的更高能量密度和优异的循环稳定性。
