Electrocatalytic oxidation of K4[Fe(CN)6] by metal-reducing bacteriumShewanella oneidensis MR-1

Zhiyong Zheng, Yong Xiao, Ranran Wu, Hans Erik Mølager Christensen, Feng Zhao, Jingdong Zhang

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The microbial metabolic activities between metals and bacteria play a vital role on biogeochemical cycling of metal compounds. One of these activities is extracellular electron transfer (EET), in which some microbes exchange electrons with external redox minerals, electrodes, or even other microorganisms. The bacteria can either take electrons or give electrons. Shewanella oneidensis MR-1 (MR-1) is electrochemical active, it can transfer electrons from cell to extracellular electron acceptors including Fe(III) (hydro)oxides. In this study, we report that MR-1 electrocatalyze the oxidation of an inorganic redox compound K4[Fe(CN)6]. A pair of symmetric peak in the cyclic voltammetry (CV) of K4[Fe(CN)6] were found on bare glassy carbon electrode (GCE). Surprisingly, when the GCE is coated MR-1, the anodic peak almost sustained at the same level; while the cathodic peak apparently shrunk. We attribute this phenomenon to the electrocatalytic oxidation by MR-1. The discovery of the ability to oxidize [Fe(CN)6]4- by MR-1 broadens our horizon of the role that dissimilatory metal reduction bacteria play in the environment.
Original languageEnglish
Title of host publicationBook of Abstracts Sustain 2017
Number of pages1
Publication date2017
Article numberC-14
Publication statusPublished - 2017
EventSustain 2017 - Technical University of Denmark, Kgs. Lyngby, Denmark
Duration: 6 Dec 20176 Dec 2017


ConferenceSustain 2017
LocationTechnical University of Denmark
CityKgs. Lyngby


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