Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 13, Issue 20, Pages 9725-9735Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0cp01728k
Keywords
-
Funding
- Chinese Academy of Science, National Natural Science Foundation of China (NSFC) [20773116]
- ministry of science and technology of China [2010CB923302]
- Grants-in-Aid for Scientific Research [22108501] Funding Source: KAKEN
Ask authors/readers for more resources
Methanol (MeOH) oxidation reaction (MOR) at Pt electrodes under potentiostatic conditions has been investigated by electrochemical in situ FTIR spectroscopy (FTIRS) in attenuated-total-reflection configuration under controlled flow conditions in 0.1 M HClO4 with 2 M MeOH, where the mass transport effects are largely eliminated using a flow cell. Our results reveal that (i) at constant potentials, the methanol dehydrogenation rate decreases while the COad oxidation rate increases with the accumulation of COad until the maximum COad coverage (ca. 0.5 ML i. e., the steady state) is reached; (ii) at fixed COad coverage, the rates for MeOH decomposition to COad and COad oxidation increases with potential from 0.3 to 0.7 V (vs. RHE), with Tafel slopes for MeOH dehydrogenation of ca. 440 +/- 30 mV/dec, which is independent of COad coverage; (iii) the current efficiency of the CO pathway in MOR at 0.6 and 0.7 V is below 20% and it decreases toward higher potentials. The mechanisms as well as the potential induced change in the kinetics of different pathways involved in MOR are briefly discussed.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available