Characterizing Electron Flow through Catechol‐Graphene Composite Hydrogels
Characterizing Electron Flow through Catechol‐Graphene Composite Hydrogels
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DOI：
10.1002/admi.202202021
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发表时间：
2022-10
影响因子：
5.4
通讯作者：
Eunkyoung Kim;R. Argenziano;Zhiling Zhao;Chen‐yu Chen;Margaret Shen;W. Bentley;A. Napolitano;
中科院分区：
文献类型：
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作者：
Eunkyoung Kim;R. Argenziano;Zhiling Zhao;Chen‐yu Chen;Margaret Shen;W. Bentley;A. Napolitano;
对于需要生物相容性、安全性和/或可持续性的新兴应用，需要允许电子在水性介质中受控流动的电子材料。在这里，复合水凝胶膜组成的石墨烯和邻苯二酚的电制造，这种复合材料提供协同性能的报告。石墨烯具有类似金属的导电性，并通过双电层机制实现电荷存储。儿茶酚赋予氧化还原活性，并通过氧化还原机制实现电荷存储。重要的是，儿茶酚有两种功能群：导电儿茶酚（可能与石墨烯密切接触）允许直接电子转移;非导电儿茶酚（可能与石墨烯物理分离）需要可扩散的介质来实现电子转移。使用各种光谱电化学测量，证明了复合材料的电荷存储容量与邻苯二酚基团可以进行氧化还原状态切换的程度成比例地增加。为了说明这项工作的广泛相关性，讨论了氧化还原状态转换如何与能量材料的电荷储存和分子电子材料的记忆有关。作者认为这项工作是重要的，因为它表明：导电和氧化还原活性成分使电荷存储和电子转移的机制明显不同;这些成分协同作用;介体提供了扩展电子材料能力的独特机会。
Electronic materials that allow the controlled flow of electrons in aqueous media are required for emerging applications that require biocompatibility, safety, and/or sustainability. Here, a composite hydrogel film composed of graphene and catechol is electrofabricated, and that this composite offers synergistic properties is reported. Graphene confers metal‐like conductivity and enables charge‐storage through an electrical double layer mechanism. Catechol confers redox‐activity and enables charge‐storage through a redox mechanism. Importantly, there are two functional populations of catechols: conducting‐catechols (presumably in intimate contact with graphene) allow direct electron‐transfer; and non‐conducting‐catechols (presumably physically separated from graphene) require diffusible mediators to enable electron‐transfer. Using a variety of spectroelectrochemical measurements, that the capacity of the composite for charge‐storage increases in proportion to the extent by which the catechol‐groups can undergo redox‐state switching is demonstrated. To illustrate the broad relevance of this work, how the redox‐state switching can be related to both the charge storage of energy materials and the memory of molecular electronic materials is discussed. The authors believe this work is significant because it demonstrates that: conducting and redox‐active components enable distinctly different mechanisms for charge‐storage and electron‐transfer; these components act synergistically; and mediators provide unique opportunities to extend the capabilities of electronic materials.