Electrochromic Graphene Molecules

Ji, Zhiqiang; Doorn, Stephen K.; Sykora, Milan

doi:10.1021/acsnano.5b00093

Title: Electrochromic Graphene Molecules

Journal Article · Fri Mar 13 00:00:00 EDT 2015 · ACS Nano

DOI:https://doi.org/10.1021/acsnano.5b00093· OSTI ID:1239116

Ji, Zhiqiang ^[1]; Doorn, Stephen K. ^[1]; Sykora, Milan ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Polyclic aromatic hydrocarbons, also called Graphene Molecules (GMs), with chemical composition C₁₃₂H₃₆(COOH)₂ were synthesized in-situ on the surface of transparent nanocrystaline indium tin oxide (nc-ITO) electrodes. Their electronic structure was studied electrochemically and spectro-electrochemically. Variations in the potential applied onto the nc-ITO/GM electrodes induce only small changes in the observed current but they produce dramatic changes in the absorption of the GMs, which are associated with their oxidation and reduction. Analysis of the absorption changes using modified Nernst equation is used to determine standard potentials associated with the individual charge transfer processes. For the GMs prepared here these were found to be E_1,ox ⁰ = 0.77± 0.01 V and E_2,ox⁰ = 1.24 ± 0.02 V vs. NHE for the first and second oxidation and E_1,red ⁰ = -1.50 ± 0.04 V for the first reduction. The charge transfer processes are found to be non-ideal. The non-ideality factors associated with the oxidation and reduction processes suggest presence of strong interactions between the GM redox centers. Under the conditions of potential cycling GMs show rapid (seconds) color change with high contrast and stability. An electrochromic application is demonstrated wherein the GMs are used as the optically active component.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1239116

Report Number(s):: LA-UR-14-27792

Journal Information:: ACS Nano, Vol. 9, Issue 4; ISSN 1936-0851

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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