Porphyrin-sensitized nanoparticulate TiO 2 as the photoanode of a hybrid photoelectrochemical biofuel cell

Alicia Brune, Goojin Jeong, Paul A. Liddell, Tadashi Sotomura, Thomas Moore, Ana Moore, Devens Gust

Research output: Contribution to journalArticle

79 Scopus citations

Abstract

Porphyrin-sensitized nanoparticulate TiO 2 on conducting glass has been investigated as a photoanode material for a new cell that converts light energy into electricity. The cell is a hybrid of a dye-sensitized nanoparticulate semiconductor photoelectrochemical solar cell, and a biofuel cell that oxidizes glucose. Porphyrin molecules excited by light inject electrons into the photoanode, from where they enter the external circuit. The resulting porphyrin radical cations are reduced by NADH in aqueous buffer, ultimately regenerating the photoanode and producing NAD +. Glucose dehydrogenase oxidizes glucose, and in the process recycles NAD + back to NADH. The photoanode is coupled with a suitable cathode to make a functioning cell (Hg/Hg 2SO 4 was employed for evaluation purposes). The cell produces 1.1V at open circuit and has a fill factor of 0.61. These values are both significantly higher than those for a previously reported cell of a similar type based on an SnO 2 electrode.

Original languageEnglish (US)
Pages (from-to)8366-8371
Number of pages6
JournalLangmuir
Volume20
Issue number19
DOIs
StatePublished - Sep 14 2004

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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