Solar-powered electrochemical oxidation of organic compounds coupled with the cathodic production of molecular hydrogen

Hyunwoong Park, Chad D. Vecitis, Michael R. Hoffmann

Research output: Contribution to journalArticlepeer-review

87 Scopus citations

Abstract

A Bi-doped TiO2 anode, which is prepared from a mixed metal oxide coating deposited on Ti metal, is shown to be efficient for conventional water splitting. In this hybrid photovoltaic-electrochemical system, a photovoltaic (PV) cell is used to convert solar light to electricity, which is then used to oxidize a series of phenolic compounds at the semiconductor anode to carbon dioxide with the simultaneous production of molecular hydrogen from water/proton reduction at the stainless steel cathode. Degradation of phenol in the presence of a background NaCl electrolyte produces chlorinated phenols as reaction intermediates, which are subsequently oxidized completely to carbon dioxide and low-molecular weight carboxylic acids. The anodic current efficiency for the complete oxidation of phenolic compounds ranges from 3% to 17%, while the cathodic current efficiency and the energy efficiency for hydrogen gas generation range from 68% to 95% and 30% to 70%, respectively.

Original languageEnglish
Pages (from-to)7616-7626
Number of pages11
JournalJournal of Physical Chemistry A
Volume112
Issue number33
DOIs
StatePublished - 21 Aug 2008

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