Photochemical splitting of carbon dioxide

INOR 567

Clifford P. Kubiak, Department of Chemistry & Biochemistry, University of California - San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0358 and Aaron Sathrum, asathrum@ucsd.edu, Department of Chemistry & Biochemistry, University of California San Diego, 9500 Gilman Drive, MC 0358, La Jolla, CA 92093.
Photochemical “splitting” of carbon dioxide to carbon monoxide and oxygen both produces a fuel from solar energy and recycles atmospheric CO2. We will describe our studies of the photoelectrochemical reduction of CO2 using semiconducting p-GaP or p-GaAsP and trinuclear nickel cluster electrocatalysts. Cyclic voltammetry is used to probe the photovoltage, photocurrent and electrocatalytic efficiency. Interfacial kinetics are elucidated with model redox species such as methyl viologen and [Ru(bpy)3]2+, thereby establishing peak power, fill factor, and quantum efficiency. Carbon dioxide reduction is monitored using a gas chromatograph. Our efforts to prepare even more efficient two-electron CO2 reduction electrocatalysts will be described. Surface modification of p-GaP semiconductor electrodes is being pursued via covalent bonding with the trinuclear nickel catalysts to increase the overall carbon dioxide conversion efficiency.
 

Catalysis Relevant to Energy and Sustainability
8:30 AM-12:15 PM, Tuesday, March 27, 2007 McCormick Place East -- Room E270, Level 2, Oral

Division of Inorganic Chemistry

The 233rd ACS National Meeting, Chicago, IL, March 25-29, 2007