Methanol-tolerant oxygen reduction catalysts based on transition metal sulfides and their application to the study of methanol permeation

Reeve, Robert W.; Christensen, Paul; Dickinson, Amanda; Hamnett, A.; Scott, Keith

doi:10.1016/s0013-4686(00)00556-9

Cited by 140 publications

(61 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Most Pt-based cathodes are catalytically active for methanol oxidation under cell operating conditions since methanol oxidation commences at much more negative potential than O 2 reduction. This leads to a mixed cathode potential [26].…”

Section: Effects Of Methanol On O 2 Reductionmentioning

confidence: 99%

Electrochemical Reduction of Oxygen on Carbon Supported Pt and Pt/Ru Fuel Cell Electrodes in Alkaline Solutions

Scott²,

Reeve

2003

Fuel Cells

View full text Add to dashboard Cite

A study of O2 reduction in 1 M NaOH solution at gas diffusion electrodes made from carbon supported Pt and Pt/Ru catalysts is reported. Two Tafel regions were observed for both the Pt and Pt/Ru electrodes. Although the same mechanism was suggested for oxygen reduction on both Pt and Pt/Ru catalysts, the O2 reduction activity was lower on Ru. Electrochemical Impedance Spectroscopy (EIS) analysis was carried out at different potentials and showed the significant contribution of diffusion on the reaction process and kinetics. The effect of methanol on O2 reduction was investigated in solutions containing various concentrations of methanol. The electrode performance deteriorated with increasing methanol concentration because of a mixed cathode potential. The methanol tolerance, i. e., the methanol concentration which polarises the O2 reduction reaction for O2 reduction, at the Pt/C electrode with a Pt loading of 1.2 mg cm–2 is 0.2 M methanol in 1 M NaOH.

show abstract

Section: Effects Of Methanol On O 2 Reductionmentioning

confidence: 99%

Electrochemical Reduction of Oxygen on Carbon Supported Pt and Pt/Ru Fuel Cell Electrodes in Alkaline Solutions

Scott²,

Reeve

2003

Fuel Cells

View full text Add to dashboard Cite

show abstract

“…Therefore, it is very important to develop methanol-tolerant oxygen reduction catalysts. 24 In addition, the particle size effect also has a large impact on the activity of electrocatalyst. The metal nanoparticles with $4 nm size in the commercial 40 wt% Pt/C electrocatalyst can provide higher specific activity.…”

mentioning

confidence: 99%

Preparation of highly active Pt/C cathode electrocatalysts for DMFCs by an improved aqueous impregnation method

Zhou

Wang

Zhou

et al. 2003

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

An improved aqueous impregnation method was used to prepare 40 wt% Pt/C electrocatalysts. TEM analysis of the samples showed that the Pt particles impregnated for a short time have a very narrow size distribution in the range of 1-4 nm with an average size of 2.6 nm. UV-vis spectroscopy measurements verified that the redox reaction between PtCl 6 2À and formaldehyde took place with a slow rate at ambient temperature via a two-step reaction path, where PtCl 4 2À serves as an intermediate. The use of the short-time-impregnated 40 wt% Pt/C as cathode electrocatalysts in direct methanol fuel cells yields better performance than that of commercial 40 wt% Pt/C electrocatalyst. Experimental evidence provides clues for the fundamental understanding of elementary steps of the redox reactions, which helps in guiding the design and preparation of highly dispersed Pt catalyst for fuel cells.

show abstract

“…Figure 6 shows performance curves of DMFC's [17] at different operating conditions. Calculated values agree well with the practical performance curves.…”

Section: The Assumption and Deductionmentioning

confidence: 99%

The General Rule of Power Converted from Chemical Energy to Electrical Energy

2004

View full text Add to dashboard Cite

Electrochemical power sources are widely used to convert chemical energy to electrical energy. Here we report an equation to describe the electrical power characteristics i.e., potential vs. the current performance curves, namely polarization curves of electrochemical power sources. From this basic equation, we describe the performance curve of general electrochemical power sources with three power source parameters: E0: equilibrium potential; R: internal resistance; and K: power conversion coefficient. The calculated values from this equation agree with the performance curves of power sources such as different type of fuel cells and batteries. The concept of the power convert coefficient is a new criterion to evaluate and compare the characteristics and capacity of different electrochemical power sources.

show abstract

Methanol-tolerant oxygen reduction catalysts based on transition metal sulfides and their application to the study of methanol permeation

Cited by 140 publications

References 20 publications

Electrochemical Reduction of Oxygen on Carbon Supported Pt and Pt/Ru Fuel Cell Electrodes in Alkaline Solutions

Electrochemical Reduction of Oxygen on Carbon Supported Pt and Pt/Ru Fuel Cell Electrodes in Alkaline Solutions

Preparation of highly active Pt/C cathode electrocatalysts for DMFCs by an improved aqueous impregnation method

The General Rule of Power Converted from Chemical Energy to Electrical Energy

Contact Info

Product

Resources

About