Christensen, Hans Erik Mølager

Wu, Ranran

Xiao, Yong

Zhang, Jingdong

Zhao, Feng

Zheng, Zhiyong

The interaction between metal and bacteria is a universal and important biogeochemical processin environment. As a dissimilatory metal reduction bacterium, the electrochemically activebacteriium Shewanella oneidensis MR-1 can transfer intracellular electrons to minerals. This ability is attributed to the redox proteins localized on the outer-membrane, for example, the MtrC, MtrB, MtrA and CymA2. Here we investigate its electrochemical properties towards redoxinorganic redox compounds. It shows strong electrocatalysis toward electrochemical oxidation of K4[Fe(CN)6]. As a redox molecule, K4[Fe(CN)6] gives a pair of redox peaks on voltammetry on bare glassy carbon electrode (GCE), symmetric with ideal peak-peak separation of about 60 mV, indicating ofa reversible one-electron transfer process(blue curve, Figure 1). Surprisingly, the presence of S. oneidensis MR-1 on GCE results an asymmetric redox peak, with almost disappearance of the cathodic peak and strengthen of the anodic peak, which is a typical catalysis feature of electrochemical oxidation. Further experiments show that S. oneidensis MR-1 does not give such electrocatalysis toredox compounds such as Ru[(NH3)6]Cl3and Resorufin. Selectivity andelectrocatalysis mechanisms of S. oneidensis MR-1 are under investigation. The ability of S. oneidensis MR-1 to catalyze redoxaction of inorganic metal complex compounds will provide an insight on metal cycles in nature

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Electrochemical Catalysis of Inorganic Complex K<sub>4</sub>[Fe(CN)<sub>6</sub>] by Shewanellaoneidensis MR-1

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Electrochemical Catalysis of Inorganic Complex K<sub>4</sub>[Fe(CN)<sub>6</sub>] by Shewanellaoneidensis MR-1

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