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Mechanistic understanding of monovalent cation transport in eumelanin pigments

Abstract

Recent research advances in charge conducting materials enable to transform the naturally-occurring materials into a crucial component in many technologies including renewable energy storages or bioelectronics. Among various candidates, eumelanins are the promising charge storage materials by exhibiting hybrid electronic ionic conductivity in a hydrated environment. Chemical and electrochemical properties of eumelanins are relatively well studied, however structure-property relationship is still elusive up to date. Here, we report the mesoscale structure of eumelanins and its impact on the charge transport. X-ray scattering suggests that eumelanin pigments exhibit the semi-crystalline structure with ordered d-spacings. These unique mesoscale structures further influence the charge transport mechanism with the cations of various sizes. Understanding the structures with consequent electrochemical properties suggest that eumelanins may be further tuned to be served as high performance naturally-occurring charge storage material.

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Publication details

The article was received on 17 Jun 2019, accepted on 12 Aug 2019 and first published on 15 Aug 2019


Article type: Communication
DOI: 10.1039/C9TB01211G
J. Mater. Chem. B, 2019, Accepted Manuscript

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    Mechanistic understanding of monovalent cation transport in eumelanin pigments

    Z. Tian, W. Hwang and Y. J. Kim, J. Mater. Chem. B, 2019, Accepted Manuscript , DOI: 10.1039/C9TB01211G

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