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    Role of the Anion on the Transport and Structure of Organic Mixed Conductors

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    20181121_AFM_submission.pdf
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    Description:
    Accepted Manuscript
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    Type
    Article
    Authors
    Cendra, Camila
    Giovannitti , Alexander
    Savva, Achilleas
    Venkatraman, Vishak
    McCulloch, Iain cc
    Salleo, Alberto
    Inal, Sahika cc
    Rivnay, Jonathan
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Bioscience Program
    Chemical Science Program
    KAUST Solar Center (KSC)
    Physical Science and Engineering (PSE) Division
    Date
    2018-12-19
    Online Publication Date
    2018-12-19
    Print Publication Date
    2019-02
    Permanent link to this record
    http://hdl.handle.net/10754/631224
    
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    Abstract
    Organic mixed conductors are increasingly employed in electrochemical devices operating in aqueous solutions that leverage simultaneous transport of ions and electrons. Indeed, their mode of operation relies on changing their doping (oxidation) state by the migration of ions to compensate for electronic charges. Nevertheless, the structural and morphological changes that organic mixed conductors experience when ions and water penetrate the material are not fully understood. Through a combination of electrochemical, gravimetric, and structural characterization, the effects of water and anions with a hydrophilic conjugated polymer are elucidated. Using a series of sodium-ion aqueous salts of varying anion size, hydration shells, and acidity, the links between the nature of the anion and the transport and structural properties of the polymer are systematically studied. Upon doping, ions intercalate in the crystallites, permanently modifying the lattice spacings, and residual water swells the film. The polymer, however, maintains electrochemical reversibility. The performance of electrochemical transistors reveals that doping with larger, less hydrated, anions increases their transconductance but decreases switching speed. This study highlights the complexity of electrolyte-mixed conductor interactions and advances materials design, emphasizing the coupled role of polymer and electrolyte (solvent and ion) in device performance.
    Citation
    Cendra C, Giovannitti A, Savva A, Venkatraman V, McCulloch I, et al. (2018) Role of the Anion on the Transport and Structure of Organic Mixed Conductors. Advanced Functional Materials 29: 1807034. Available: http://dx.doi.org/10.1002/adfm.201807034.
    Sponsors
    The authors acknowledge support from the National Science Foundation including Grant No. NSF DMR-1751308 (J.R.), Grant No. NSF DMR-1507826 (A.S.), and Grant No. NSF DMR-1808401 (C.C.). C.C. also gratefully acknowledges support from the “la Caixa” Foundation. Portions of this research were carried out at the Stanford Synchrotron Radiation Lightsource, a national user facility operated by Stanford University on behalf of the U.S. Department of Energy, Office of Basic Energy Sciences. A.G. and I.M. acknowledge funding from Engineering and Physical Sciences Research Council Project EP/G037515/1 and EP/N509486/1. This work utilized the Northwestern University Micro/Nano Fabrication Facility (NUFAB), which is partially supported by the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (Grant No. NSF ECCS-1542205), the Materials Research Science and Engineering Center (Grant No. NSF DMR-1720139), the State of Illinois, and Northwestern University.
    Publisher
    Wiley
    Journal
    Advanced Functional Materials
    DOI
    10.1002/adfm.201807034
    Additional Links
    https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.201807034
    ae974a485f413a2113503eed53cd6c53
    10.1002/adfm.201807034
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Bioscience Program; Physical Science and Engineering (PSE) Division; Chemical Science Program; KAUST Solar Center (KSC)

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