期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 1, 期 1, 页码 398-401出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz900310c
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- Israel Ministry of Infrastructures
- Kreitman foundation of Ben-Gurion University of the Negev, Beer-Sheva, Israel
The interaction of electropolymerized Co(III)TAPP (polyCoTAPP) films with adsorbed resorcinol on glassy carbon (GC) and with surface quinone functionalities on aerogel carbon (AEC) were studied using reflection UV-visible spectroscopy and X-ray photoelectron spectroscopy. A red shift of the Soret band and the appearance of new Q bands appearing after adsorption of resorcinol on a GC/polyCoTAPP film was interpreted as being due to change of the metalloporphyrin electronic structure. The photoelectron depth profiles for an AEC/polyCoTAPP film showed that the cobalt ion is mostly in the Co(III) state at the outer layers of the film, while the amount of cobalt ion in the formal +2 state gradually increases in the inner film layers. This seems to indicate the formation of charge-transfer complexes between the metalloporphyrin and reduced quinone functionalities on the AEC surface. Understanding the nature of metalloporphyrin/porous carbon structures is an important step toward the design of reliable and low-cost non-noble-metal oxygen reduction catalytic electrodes and their application in fuel cells and batteries.
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