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Selective electrocatalysis of biofuel molecular oxidation by palladium nanoparticles generated on Shewanella oneidensis MR-1

Abstract

Production of molecular scale palladium (Pd) nanoparticles (NPs) is important due to their catalytic function in electrochemical oxidation of a number of core fuel molecules in fuel cells. Biogenetic methods offer an economic and environmentally friendly synthesis route. In this work, the electrochemically active bacterium Shewanella oneidensis MR-1 is employed as a reducing agent to generate PdNPs as well as a support for immobilization of the PdNPs. The synthesis was carried out at 28 °C and pH 7.0, and completed within one hour. The PdNPs are monodisperse (6.2 nm) and located on the bacterial membrane surface. Mapping by conductive atomic force microscopy shows that the presence of these PdNPs promotes electron transfer and enhances the electric conductivity of the cells. Compared to electrodeposited PdNPs, PdNPs generated by S. oneidensis MR-1 catalyzes electrochemically the oxidation of formate with 200 mV less over potential. Notably they show unique selective activity toward electrochemical oxidation of formate, whereas no electrochemical catalysis was found for oxidation of ethanol, methanol, acetate, and formate. This work demonstrates a sustainable and low-cost method for producing efficient PdNPs catalysts with high catalytic selectivity.

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Publication details

The article was received on 07 Feb 2018, accepted on 13 Apr 2018 and first published on 16 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA01318G
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Selective electrocatalysis of biofuel molecular oxidation by palladium nanoparticles generated on Shewanella oneidensis MR-1

    R. Wu, X. Tian, Y. Xiao, J. Ulstrup, H. E. M. Christensen, F. Zhao and J. Zhang, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA01318G

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