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Immobilization of FeFe-hydrogenase on black TiO2 nanotubes as biocathodes for the hydrogen evolution reaction

Abstract

Hydrogenases are attractive biocatalysts for utilization in electrochemical devices as potential replacement for Pt in hydrogen evolving electrodes. In this work, we investigate the immobilization of ferredoxin tagged FeFe-hydrogenase (Fd-HydA1) on black TiO2 nanotubes (bTNTs), with uniform nanotube opening diameters of 140 nm. By utilizing an immunogold labelling method, we show that the enzymes attach on the top surface of the bTNTs film rather than on the inner nanotube walls, reflecting the difficulty to insert enzymes into high aspect-ratio nanomaterials for O2-shielding. Nevertheless, cyclic voltammetry demonstrates direct electron transfer between Fd-HydA1 and bTNTs for the hydrogen evolution reaction (HER) in neutral media. This work provides new insight towards design of new nanostructured electrodes for enzyme immobilization.
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Category

Academic article

Language

English

Author(s)

  • Xin Liu
  • Sanne Risbakk
  • Patricia Almeida Carvalho
  • Mingyi Yang
  • Paul Hoff Backe
  • Magnar Bjørås
  • Truls Norby
  • Athanasios Chatzitakis

Affiliation

  • SINTEF Industry / Sustainable Energy Technology
  • University of Oslo
  • Oslo University Hospital

Year

2022

Published in

Electrochemistry communications

ISSN

1388-2481

Volume

135

View this publication at Norwegian Research Information Repository