SINGLE ATOM CATALYSTS FOR SOLAR FUEL PRODUCTION
Priscilla Torres, Andrew Peterson.
Brown University, Providence, RI.
Past studies have shown successful carbon dioxide (CO2) reduction and hydrogen evolution reactions (HER) with various bulk metal foils. Our research explored possible cost-effective and efficient catalysts to reduce CO2 or evolve H2 in the form of novel single-atom catalysts consisting of individual metal atoms supported on a reduced graphene oxide (rGO) substrate. We have performed galvanostatic experiments to measure the quantitative products formed by gas chromatography (GC) and infrared spectroscopy (IR) analysis. Additionally, rotating disk analysis was used as a support system to measure current activity. Three metal samples, molybdenum, copper, and silver, were annealed onto rGO at 2 distinct temperatures. Silver annealed at a lower temperature was shown to be more effective in CO2 and H2 production at lower potentials compared to the other metal samples at the same current density. A small, yet significant, amount of CH4 and C2H4 was found in certain copper samples as well.