AC-impedance spectroscopy of anodic reactions with adsorbed intermediates: electro-oxidations of 2-propanol and methanol on carbon-supported Pt catalyst

Otomo, Junichiro; Li, Xiaoen; Kobayashi, Takeshi; Wen, Ching–ju; Nagamoto, Hidetoshi; Takahashi, Hiroshi

doi:10.1016/j.jelechem.2004.07.002

Cited by 40 publications

(37 citation statements)

References 34 publications

(69 reference statements)

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“…The behavior observed for Pt electrode is in agreement with literature data [42][43][44]. Surprisingly, the Pt/Ir/Pt nanostructured electrodes, did not exhibit the inductive arc.…”

Section: Resultssupporting

confidence: 91%

CO and methanol electrooxidation on Pt/Ir/Pt multilayers electrodes

Freitas

Antunes

Pereira

2009

Electrochimica Acta

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“…The behavior observed for Pt electrode is in agreement with literature data [42][43][44]. Surprisingly, the Pt/Ir/Pt nanostructured electrodes, did not exhibit the inductive arc.…”

Section: Resultssupporting

confidence: 91%

CO and methanol electrooxidation on Pt/Ir/Pt multilayers electrodes

Freitas

Antunes

Pereira

2009

Electrochimica Acta

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“…The diameter of the first semi circular arc of X-Pt/C is about 50% smaller than that of 20 wt% Pt/C, which indicates an ohmic process, as reported by Jens T. Mueller [16]. It may relate to electrical conduction via an electrical double layer between the X-Pt/C catalyst particle and aqueous electrolyte (as previously reported [17]), or to the decrease in contact resistance between Pt and carbon. However, the diameter of the secondary circular arc for X-Pt/C is larger than that for 20 wt% Pt/C.…”

Section: Resultssupporting

confidence: 67%

Preparation of Low Loading Pt/C Catalyst by Carbon Xerogel Method for Ethanol Electrooxidation

Zhang

Wang

et al. 2007

Catal Lett

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Low platium loading Pt/C catalyst was prepared by direct Pt-embedded carbon xerogel method. The Pt content of the as-prepared Pt/C is about 4.32 wt% and has a typical polycrystalline phase. Textural and structural characteristics of the catalysts were characterized by XRD, EDS and BET. Pt-embedded in carbon xerogel increases the specific surface area and pore volume of the X-Pt/C during carbon gelation and the carbonization process. Electrochemical characteristics of the catalysts for ethanol electrooxidation were measured. The results indicated that the as-prepared 4.32 wt% Pt/C has higher mass current density in ethanol electrooxidation as compared to the 20 wt% Pt/C. This may be due to the high roughness of the Pt surface that is formed during the carbon gelation and carbonization process.

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“…4,18,19 The methanol oxidation showed different Nyquist plot patterns with various potentials at 25°C as shown in figure 3. The different Nyquist patterns imply that the mechanism of the electrooxidation reaction differ at various potentials.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

“…An emerging technology of DAFC uses liquid alcohols without an external fuel processing unit such as methanol, ethanol and propanol which made them more versatile in many portable products. [1][2][3][4][5] DAFCs generate power through the direct oxidation of alcohol in conjunction with the reduction of oxygen (in air). The major challenges faced in DAFC are (i) methanol crossover which can only be overcome by developing new membranes; (ii) slow electrochemical kinetics at electrode/electrolyte interfaces which can only be overcome by developing new electrocatalysts for both anode and cathode.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence studies on the electro-oxidation of aliphatic alcohols with modified platinum electrodes

2009

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Temperature dependence on the electro-oxidation of methanol, ethanol and 1-propanol in 0⋅5 M H 2 SO 4 were investigated with Pt and PtRu electrodes. Tafel slope and apparent activation energy were evaluated from the cyclic voltammetric data in the low potential region (0⋅3-0⋅5 V vs SHE). The CV results provided Tafel slopes for alcohols in the range of 200-400 mV dec -1 which indicated a difference in the rate determining step. The decrease in Tafel slope was only observed in the case of methanol for the Ru-modified Pt electrode. This indicates that Ru improves the rate of determining step for methanol while hindering it for the other alcohols. The electrochemical impedance spectroscopy was also used to evaluate the electro-oxidation mechanism of alcohols on these electrodes. The simulated EIS results provided two important parameters: charge transfer resistance (R ct ) and inductance (L). The R -1 ct and L -1 represent the rate of alcohol electro-oxidation and rate of desorption of intermediate species, respectively. These values increased with the increasing of temperature. The results from two techniques were well agreed that the electro-oxidation of methanol was improved by raising the temperature and ruthenium modification.

show abstract

AC-impedance spectroscopy of anodic reactions with adsorbed intermediates: electro-oxidations of 2-propanol and methanol on carbon-supported Pt catalyst

Cited by 40 publications

References 34 publications

CO and methanol electrooxidation on Pt/Ir/Pt multilayers electrodes

CO and methanol electrooxidation on Pt/Ir/Pt multilayers electrodes

Preparation of Low Loading Pt/C Catalyst by Carbon Xerogel Method for Ethanol Electrooxidation

Temperature dependence studies on the electro-oxidation of aliphatic alcohols with modified platinum electrodes

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