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Orientation-Controlled Electrocatalytic Efficiency of an Adsorbed Oxygen-Tolerant Hydrogenase
Zitatschlüssel Heidary2015
Autor Heidary, N. and Utesch, T. and Zerball, M. and Horch, M. and Millo, D. and Fritsch, J. and Lenz, O. and von Klitzing, R. and Hildebrandt, P. and Fischer, A. and Mroginski, M. A. and Zebger, I.
Seiten e0143101
Jahr 2015
DOI 10.1371/journal.pone.0143101
Journal Plos One
Jahrgang 10
Nummer 11
Verlag Public Library Science
Zusammenfassung Protein immobilization on electrodes is a key concept in exploiting enzymatic processes for bioelectronic devices. For optimum performance, an in-depth understanding of the enzyme-surface interactions is required. Here, we introduce an integral approach of experimental and theoretical methods that provides detailed insights into the adsorption of an oxygen-tolerant [NiFe] hydrogenase on a biocompatible gold electrode. Using atomic force microscopy, ellipsometry, surface-enhanced IR spectroscopy, and protein film voltammetry, we explore enzyme coverage, integrity, and activity, thereby probing both structure and catalytic H-2 conversion of the enzyme. Electrocatalytic efficiencies can be correlated with the mode of protein adsorption on the electrode as estimated theoretically by molecular dynamics simulations. Our results reveal that pre-activation at low potentials results in increased current densities, which can be rationalized in terms of a potential-induced re-orientation of the immobilized enzyme.
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