Mediatorless sugar/oxygen enzymatic fuel cells based on gold nanoparticle-modified electrodes

Research output: Contribution to journalArticle

Abstract

We report on the fabrication and characterisation of a gold-nanoparticle (AuNP)-based mediatorless sugar/oxygen biofuel cell (BFC) operating in neutral sugar-containing buffers and human physiological fluids, such as blood and plasma. First, Corynascus thermophilus cellobiose dehydrogenase (CtCDH) and Myrotheciumverrucaria bilirubin oxidase (MvBOx), used as anodic and cathodic bioelements, respectively, were immobilised on gold electrodes modified with 20 nm AuNPs. Detailed characterisation and optimisation of a new CDH/AuNP-based bioanode were performed and the following fundamental parameters were obtained: (i) the redox potential of the haem-containing centre of the enzyme was measured to be 75 mV vs. NHE, (ii) the surface coverage of CtCDH was found to be 0.65 pmol cm(-2) corresponding to a sub-monolayer coverage of the thiol-modified AuNPs by the enzyme, (iii) a turnover number for CtCDH immobilised on thiol-modified AuNPs was calculated to be ca. 0.5 s(-1), and (iv) the maximal current densities as high as 40 mu A cm(-2) were registered in sugar-containing neutral buffers. Second, both biomodified electrodes, namely the CtCDH/AuNP-based bioanode and the MvBOx/AuNP-based biocathode, were combined into a functional BFC and the designed biodevices were carefully investigated. The following characteristics of the mediator-, separator- and membrane-less, miniature BFC were obtained: in phosphate buffer; an open-circuit voltage of 0.68 V, a maximum power density of 15 mu W cm(-2) at a cell voltage of 0.52 V and in human blood; an open-circuit voltage of 0.65 V. a maximum power density of 3 mu W cm(-2) at a cell voltage of 0.45 V, respectively. The estimated half-lives of the biodevices were found to be >12, <8, and <2h in a sugar-containing buffer, human plasma, and blood, respectively. The basic characteristics of mediatorless sugar/oxygen BFCs were significantly improved compared with previously designed biodevices, because of the usage of three-dimensional AuNP-modified electrodes. (C) 2011 Elsevier B.V. All rights reserved.

Details

Authors
  • Xiaoju Wang
  • Magnus Falk
  • Roberto Ortiz
  • Hirotoshi Matsumura
  • Johan Bobacka
  • Roland Ludwig
  • Mikael Bergelin
  • Lo Gorton
  • Sergey Shleev
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Biological Sciences

Keywords

  • Enzymatic fuel cells, Direct electron transfer, Gold nanoparticles, Cellobiose dehydrogenase, Bilirubin oxidase
Original languageEnglish
Pages (from-to)219-225
JournalBiosensors & Bioelectronics
Volume31
Issue number1
Publication statusPublished - 2012
Publication categoryResearch
Peer-reviewedYes

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