| AVS 54th International Symposium | |
| Renewable Energy Science & Technology Topical Conference | Wednesday Sessions |
| Session EN+SS+TF-WeM |
| Session: | Catalysis for Hydrogen Storage and the Hydrogen Economy |
| Presenter: | H. Ogasawara, Stanford Synchrotron Radiation Laboratory |
| Authors: | H. Ogasawara, Stanford Synchrotron Radiation Laboratory L.-Å Näslund, Stanford Synchrotron Radiation Laboratory J.B. MacNaughton, Stanford Synchrotron Radiation Laboratory T. Anniyev, Stanford Synchrotron Radiation Laboratory A. Nilsson, Stanford Synchrotron Radiation Laboratory |
| Correspondent: | Click to Email |
A management of appropriate humidity level is necessary for the fuel cell to operate. The oxygen reduction reaction (ORR) occurs at the triple phase boundary where gas, electrolyte containing water and catalytic metal particle contact forms humid and dry region on the surface of the catalyst. Using XPS and XAS, we have demonstrated active site poisoning by water, where the activation of oxygen to the adsorbed atomic phase occurs rapidly in the dry region, but not in the humid region. On the contrary, there is a promoter effect of water on the reduction of adsorbed atomic oxygen in the formation of a water-hydroxyl surface complex.