Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 113, Issue 43, Pages 18946-18952Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp907367k
Keywords
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Funding
- Office of Basic Energy Sciences of the Department of Energy
- Notre Dame Radiation Laboratory [NDRL 4820]
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A polymer membrane electrode assembly (MEA) consisting of a TiO2 photoanode, a Pt cathode, and a proton exchange membrane (PEM) was constructed to generate hydrogen continuously under UV excitation with no applied bias. The acidified methanol is oxidized at the UV-irradiated TiO2 photocatalyst, and H+ ions are driven to the Pt cathode surface through the Nafion membrane. Photocurrent generation of 0.34 mA/cm(2) under UV irradiation (lambda > 300 nm) shows effective operation of the fuel cell in reverse for solar hydrogen production. A polarization curve of the photoelectrolysis cell exhibits an open circuit voltage of 0.5 V and a maximum power of 45 mu W/cm(2). The reduction of H+ at a Pt cathode under no applied bias was confirmed from the evolution of H-2 gas with a rate of 69 mu L h(-1) cm(-2).
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