Rational Design of the 1,4-Diaminobenzene-Functionalized Benzoquinone Cross-Linked Polymer Electrode Material for a High-Performance Flexible Supercapacitor Device
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引用次数: 0
Abstract
Redox-active polymers have been investigated for fabricating flexible and wearable electrochemical energy storage (EES) devices. However, the core issues restricting the preparation of conjugated redox polymers in practical supercapacitor (SC) devices are its solubility in electrolyte solvents, poor ion mobility, inferior rate capability, and difficulty in processing. Our main motivation in the present work was to prepare a cross-linked polymer as an alternative to a linear polymer, which is soluble and mechanically unstable, and study its EES properties. Here, we report a molecular-engineered new donor–acceptor–donor cross-linked polymer BAPh-BQ-AC based on 1,4-diaminobenzene (DAPh) and benzoquinone (BQ) that exhibits several accessible redox-active sites for fast faradaic reversible processes. First, the as-fabricated BAPh-BQ-AC/graphite foil (GF) electrode in the three-electrode SC device was investigated. Based on the results of the three-electrode SC, we used BAPh-BQ-AC/(GF) for further charge storage testing in a two-electrode symmetric SC device. BAPh-BQ-AC/(GF) showed impressive pseudocapacitive behavior in both types of SC devices in an aqueous 1 M H2SO4 electrolyte solution. Further, a flexible symmetric supercapacitor (FSSC) device was fabricated using the BAPh-BQ-AC/graphite foil (GF) electrode in a poly(vinyl alcohol) (PVA)/H2SO4 gel electrolyte. The FSSC cell is mechanically robust at 0 and 180° bending angles. The as-fabricated FSSC devices demonstrate a specific capacitance (Csp) of 102.39 and 99.59 mF cm–2 at 0 and 180° bending angles, respectively, at 0.5 mA cm–2 current density. At 2 mA cm–2, the FSSC cells exhibit a satisfactory Csp retention of 75.74% (0°) and 70.98% (180°) of their initial values after 5000 galvanostatic charging–discharging cycles, indicating superb mechanical flexibility. Moreover, at 0.5 mA cm–2, it exhibits an energy density of 17.90 μW h cm–2 at 1.76 mW cm–2 power density. The remarkable electrochemical and mechanical characteristics indicate that this novel BAPh-BQ-AC/(GF) electrode-based FSSC cell configuration is expected to contribute for the design and preparation of promising flexible and wearable electronics.
氧化还原活性聚合物已被研究用于制造柔性和可穿戴电化学储能(EES)装置。然而,限制共轭氧化还原聚合物在实际超级电容器(SC)器件中制备的核心问题是其在电解质溶剂中的溶解度、离子迁移率差、速率能力差以及加工困难。我们在本工作中的主要动机是制备一种交联聚合物作为线性聚合物的替代品,这种聚合物是可溶的,机械不稳定的,并研究其EES性质。在这里,我们报道了一种基于1,4-二氨基苯(DAPh)和苯醌(BQ)的分子工程新型给体-受体-给体交联聚合物BAPh-BQ-AC,该聚合物具有几个可接近的氧化还原活性位点,可用于快速的法拉第可逆过程。首先,研究了三电极SC器件中制备的bph - bq - ac /石墨箔(GF)电极。在此基础上,我们利用bph - bq - ac /(GF)在双电极对称SC器件中进行了进一步的电荷存储测试。bph - bq - ac /(GF)在1 M H2SO4水溶液中表现出令人印象深刻的赝电容行为。在聚乙烯醇(PVA)/H2SO4凝胶电解质中,利用bph - bq - ac /石墨箔(GF)电极制备了柔性对称超级电容器(FSSC)器件。FSSC单元在0°和180°弯曲角度下具有机械坚固性。制备的FSSC器件在0.5 mA cm-2电流密度下,在0°和180°弯曲角下的比电容(Csp)分别为102.39和99.59 mF cm-2。在2 mA cm-2条件下,经过5000次恒流充放电循环后,FSSC电池的Csp保留率分别为初始值的75.74%(0°)和70.98%(180°),显示出优异的机械灵活性。在0.5 mA cm-2时,其能量密度为17.90 μW h cm-2,功率密度为1.76 mW cm-2。卓越的电化学和力学特性表明,这种新颖的基于bph - bq - ac /(GF)电极的FSSC电池结构有望为有前途的柔性和可穿戴电子产品的设计和制备做出贡献。
期刊介绍:
ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.