Characterizing Electron Flow through Catechol-Graphene Composite Hydrogels

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dc.contributor.authorKim, Eunkyoung
dc.contributor.authorArgenziano, Rita
dc.contributor.authorZhao, Zhiling
dc.contributor.authorChen, Chen-yu
dc.contributor.authorShen, Margaret
dc.contributor.authorBentley, William E.
dc.contributor.authorNapolitano, Alessandra
dc.contributor.authorPayne, Gregory F.
dc.date.accessioned2023-10-03T13:22:10Z
dc.date.available2023-10-03T13:22:10Z
dc.date.issued2022-10-20
dc.description.abstractElectronic 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.
dc.description.urihttps://doi.org/10.1002/admi.202202021
dc.identifierhttps://doi.org/10.13016/dspace/xfsv-jtfx
dc.identifier.citationKim, E., Argenziano, R., Zhao, Z., Chen, C., Shen, M., Bentley, W. E., Napolitano, A., Payne, G. F., Characterizing Electron Flow through Catechol-Graphene Composite Hydrogels. Adv. Mater. Interfaces 2022, 9, 2202021.
dc.identifier.urihttp://hdl.handle.net/1903/30637
dc.language.isoen_US
dc.publisherWiley
dc.relation.isAvailableAtA. James Clark School of Engineeringen_us
dc.relation.isAvailableAtFischell Department of Bioengineeringen_us
dc.relation.isAvailableAtDigital Repository at the University of Marylanden_us
dc.relation.isAvailableAtUniversity of Maryland (College Park, MD)en_us
dc.subjectcatechols
dc.subjectcharge storage
dc.subjectchitosan
dc.subjectelectrofabrication
dc.subjectgraphene
dc.subjectmolecular memory
dc.subjectredox
dc.titleCharacterizing Electron Flow through Catechol-Graphene Composite Hydrogels
dc.typeArticle
local.equitableAccessSubmissionNo

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