Electrochromic graphene molecules

ACS Nano
Zhiqiang JiMilan Sykora

Abstract

Polyclic aromatic hydrocarbons also called Graphene Molecules (GMs), with chemical composition C132H36(COOH)2 were synthesized in situ on the surface of transparent nanocrystalline indium tin oxide (nc-ITO) electrodes and 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 a 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 E1,ox(0) = 0.77 ± 0.01 V and E2,ox(0) = 1.24 ± 0.02 V vs NHE for the first and second oxidation and E1,red(0) = -1.50 ± 0.04 V for the first reduction. The charge transfer processes are found to be nonideal. The nonideality factors associated with the oxidation and reduction processes are attributed to 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 electrochr...Continue Reading

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Citations

Feb 23, 2017·ACS Nano·Grant J StecNaomi J Halas
Feb 16, 2019·The Journal of Physical Chemistry Letters·Zhiqiang JiMilan Sykora
Nov 20, 2019·ACS Applied Materials & Interfaces·Hiroto Ogata, Soichiro Yoshimoto
Dec 18, 2019·The Journal of Physical Chemistry Letters·Varun SinghKsenija D Glusac

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