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    Gas diffusion electrodes modified with binary doped polyaniline for enhanced CO2 conversion during microbial electrosynthesis

    Year: 2021

    Journal: Electrochim. Acta, Volume 372, MAR 10

    Authors: Fontmorin, Jean-Marie; Izadi, Paniz; Li, Da; Lim, Swee Su; Farooq, Shehna; Bilal, Sal Salma; Cheng, Shaoan; Yu, Eileen Hao

    Organizations: EPSRC LifesCO2R project [EP/N009746/1]; EPSRC NECEM [EP/R021503/1]; NBIC [002POC19034]; NERC MeteoRR [NE/L014246/1]; SAgE DTA PhD studentship by Newcastle University; Open Fund Project for State Key Laboratory of Clean Energy Utilization with Zhejiang University [ZJUCEU2019004]; BBSRC [BB/R012415/1] Funding Source: UKRI; EPSRC [EP/R021503/1, EP/N009746/1] Funding Source: UKRI

    Keywords: Bioelectrochemical systems; Microbial electrosynthesis; Carbon dioxide; Gas diffusion electrode; Polyaniline

    Microbial electrosynthesis (MES) is a promising technology to convert CO2 into value-added chemicals. Enhancing the interactions between biofilms and electrodes is the key of bioelectrochemical systems (BES). In this work, we studied the conversion of CO2 by MES in reactors equipped with novel gas diffusion electrodes (GDEs) modified with a polyaniline (PANI) polymer binary doped with H2SO4 and ammonium lauryl sulfate. The enhanced conductive and hydrophilic properties of the polymer increased the biocompatibility of the PANI-modified GDEs compared to the non-modified carbon GDEs. This increased biocompatibility resulted in faster start-up and higher bioproduction of volatile fatty acids (VFAs) such as acetate and butyrate. Up to 4400 ppm acetate was produced in PANI-modified reactors after 24 days of operation, compared to 408 ppm in reactors equipped with non-modified GDEs. A maximum acetate concentration of 7500 ppm (production rate of 554.8 +/- 267.5 ppm day(-1)) was reached in reactors equipped with PANI-GDEs. After 60 days, apart from acetate, 245 ppm butyrate was produced in reactors equipped with the electrodes modified with PANI, while less than 60 ppm was produced with non-modified GDEs. SEM analysis revealed the development of biofilms on both modified and non-modified electrodes, but the images also suggest differences in compositions. (C) 2021 The Authors. Published by Elsevier Ltd.
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