TY - JOUR
T1 - Electrochemical behaviors of dimethyl ether on platinum single crystal electrodes. Part II
T2 - Pt(1 0 0)
AU - Lu, Leilei
AU - Yin, Geping
AU - Tong, Yujin
AU - Zhang, Yi
AU - Gao, Yunzhi
AU - Osawa, Masatoshi
AU - Ye, Shen
N1 - Funding Information:
This research is supported by a Grant-in-Aid for Scientific Research (B) 19350099 and Exploratory Research 21655074 from MEXT and PRESTO, Japan Science and Technology Agency (JST), and the Natural Science Foundation of China (No. 20476020).
PY - 2010/4/1
Y1 - 2010/4/1
N2 - The electrochemical behaviors of dimethyl ether (CH3-O-CH3, DME), which is a promising fuel for the fuel cell, on Pt(1 0 0) electrode in 0.5 M H2SO4 solution have been investigated in detail by electrochemical and in situ infrared (IR) measurements. As the potential is swept from 0.05 V (vs. RHE) to positive direction at 50 mV s-1, the dehydrogenation peak of DME is observed around 0.33 V to generate a reaction intermediate and is further converted to carbon monoxide (CO) in more positive potential region. The main peak for DME bulk oxidation locates around 0.80 and 0.72 V in the positive- and negative-going potential sweep, respectively. The positions of these peaks strongly depend on the scan rate. The in situ IR observations show that (CH3OCH2-)ad is an intermediate for the first dehydrogenation step of DME on Pt(1 0 0) surface and can serve as a precursor of the subsequent intermediate of adsorbed CO (COad). Cyclic voltammograms of Pt high index single crystal planes Pt(hkl) show that the direct oxidation of DME is suppressed by decreasing the (1 0 0) terrace width. Based on these results, a possible reaction mechanism for DME electro-oxidation on the platinum single crystal electrode surface is proposed.
AB - The electrochemical behaviors of dimethyl ether (CH3-O-CH3, DME), which is a promising fuel for the fuel cell, on Pt(1 0 0) electrode in 0.5 M H2SO4 solution have been investigated in detail by electrochemical and in situ infrared (IR) measurements. As the potential is swept from 0.05 V (vs. RHE) to positive direction at 50 mV s-1, the dehydrogenation peak of DME is observed around 0.33 V to generate a reaction intermediate and is further converted to carbon monoxide (CO) in more positive potential region. The main peak for DME bulk oxidation locates around 0.80 and 0.72 V in the positive- and negative-going potential sweep, respectively. The positions of these peaks strongly depend on the scan rate. The in situ IR observations show that (CH3OCH2-)ad is an intermediate for the first dehydrogenation step of DME on Pt(1 0 0) surface and can serve as a precursor of the subsequent intermediate of adsorbed CO (COad). Cyclic voltammograms of Pt high index single crystal planes Pt(hkl) show that the direct oxidation of DME is suppressed by decreasing the (1 0 0) terrace width. Based on these results, a possible reaction mechanism for DME electro-oxidation on the platinum single crystal electrode surface is proposed.
KW - Dimethyl ether (DME)
KW - Electro-oxidation
KW - Electrocatalysis
KW - Fuel cell
KW - Platinum single crystal
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U2 - 10.1016/j.jelechem.2010.02.009
DO - 10.1016/j.jelechem.2010.02.009
M3 - Article
AN - SCOPUS:77949489502
VL - 642
SP - 82
EP - 91
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
SN - 1572-6657
IS - 1
ER -