Electrocatalysis in direct methanol fuel cells: in-situ probing of PtRu anode catalyst surfaces

Dinh, Huyen N.; Ren, Xiaoming; Garzón, Fernando H.; Zelenay, Piotr; Gottesfeld, S.

doi:10.1016/s0022-0728(00)00271-0

Cited by 295 publications

(201 citation statements)

References 18 publications

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“…The maximal mixing energy of 40 kJ, applicable with the ultrasonic probe, results in the highest BET and A cat surface area values of 86.5 ± 0.3 and 96.5 ± 3m 2 g -1 , respectively. The values are found to be in good agreement with BET data reported in the literature for PtRu/C catalysts [14].…”

Section: Influence Of Ink Mixing For the Anode Constructionsupporting

confidence: 89%

“…5MH 2 SO 4 at room temperature. A cat was obtained using the charge of CO ads (Q COads ) and a conversion factor of 420 lCc m -2 [11][12][13][14], For DMFC performance measurements, a 1 M methanol solution was pumped at 2 mL min -1 through the anode side and the cathode side was exposed to dry air at a flow rate of 200 sccm. Fresh methanol solutions were used to collect the individual DMFC performance curves.…”

Section: Electrochemical Measurements In Solutionmentioning

confidence: 99%

“…A cat [13][14][15], double layer capacitance (C dl ) and proton resistance (R p ) values of the MEAs were obtained in the single cell utilizing the cathode as counter and dynamic hydrogen reference electrode (DHE) [16]. All potentials are referenced vs. the DHE in this work, unless otherwise stated.…”

Section: Mea Characterization In the Dmfcmentioning

confidence: 99%

“…All potentials are referenced vs. the DHE in this work, unless otherwise stated. A cat values were also obtained from CO ads stripping experiments [13][14][15] carried out in the fuel cell assembly. The electrochemical stripping of the CO ads was preceded by CO adsorption at 0.1 V for 20 min.…”

Section: Mea Characterization In the Dmfcmentioning

confidence: 99%

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DMFC electrode preparation, performance and proton conductivity measurements

et al. 2008

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A method that involves stenciling electrodes using dry powders for fuel cells is described and compared to anodes and cathodes prepared by the traditional spraying method using catalyst inks. Methods to determine the proton conductivity of the DMFC anode layer are also discussed. The stenciling method allows for the preparation of highly reproducible membrane electrode assemblies (MEAs) utilizing little waste material. MEAs can be prepared in a controlled manner using the stenciling technique. The resulting morphology of the as-prepared electrodes is observed to be dependent on the preparation method, while the thickness of the once hot-pressed catalyst layers appears to be independent of the preparation method. Stenciled anodes of the same catalyst loading were found to show a lower proton resistance (R p ) than sprayed anodes. However, the lower R p value was not sufficient to result in a measurable increase in the performance of a direct methanol fuel cell (DMFC); as in fact, the average steady-state DMFC performance was found to be the same using sprayed or stenciled electrodes. The DMFC performance was found to be strongly dependent on the Nafion content and large increases in the Nafion content were needed to increase the DMFC performance measurably. Even though thick electrodes were prepared in this work, the R p values of the stenciled anodes were found to be comparable to results reported in the literature for much thinner electrodes made using high metal catalyst loadings on carbon. This observation is most probably due to the higher Nafion content used in this work.

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Section: Influence Of Ink Mixing For the Anode Constructionsupporting

confidence: 89%

Section: Electrochemical Measurements In Solutionmentioning

confidence: 99%

Section: Mea Characterization In the Dmfcmentioning

confidence: 99%

Section: Mea Characterization In the Dmfcmentioning

confidence: 99%

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DMFC electrode preparation, performance and proton conductivity measurements

et al. 2008

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“…Carbon supported platinum-ruthenium alloys (PtRu/C) are one of the most promising anode catalysts for direct methanol fuel cells (DMFCs) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. The promotion effect has been mainly discussed based on the so-called "bi-functional effect" [19][20][21] or "ligand effect" [22] or a mixture of both.…”

Section: Introductionmentioning

confidence: 99%

Co-catalytic effect of nanostructured ruthenium oxide towards electro-oxidation of methanol and carbon monoxide

Sugimoto

Saida

Takasu

2006

Electrochemistry Communications

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Carbon supported platinum (Pt/C) modified with nanostructured ruthenium oxide was prepared and the activity towards the electro-oxidation of methanol and pre-adsorbed carbon monoxide was studied. Electrochemical studies at 60°C in 0.5 M H 2 SO 4 indicated that the addition of crystalline ruthenic acid nanosheets (HROns) as a co-catalyst to Pt/C promotes both methanol and carbon monoxide electro-oxidation. The increase in the activity of HROns modified Pt/C compared to Pt/C is suggested to be a result of the bi-functional characteristic of the surface of the oxide nanosheets.

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DMFCs: From Fundamental Aspects to Technology Development

Aricò¹,

Srinivasan

Antonucci³

2001

Fuel Cells

1,457

884

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This review paper describes recent developments in both the fundamental and technological aspects of direct methanol fuel cells (DMFCs). Most previous studies in this field have dealt with fundamental aspects, whereas in recent years, the technology of these devices has become the object of significant interest. This is mainly due to the fact that a probable application of DMFCs in portable power sources and in hybrid electrical vehicles has only recently been envisaged. The section on fundamentals is particularly focused on the electrocatalysis of the methanol oxidation reaction and oxygen electroreduction. In this regard, particular relevance is given to the interpretation of the promoting effect on Pt of additional elements and some aspects of the electrocatalysis of oxygen reduction in the presence of methanol crossover have been treated. The technology section deals with the development of both components and devices. Particular emphasis is given to the development of high surface area electrocatalysts and alternative electrolyte membranes to Nafion, also the fabrication methodologies for the M&E assembly have been discussed. The last part of the paper describes the recent efforts in developing DMFC stacks for both portable and electro‐traction applications. The current status of the technology in this field is presented and some important technical and economical challenges are been discussed.

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Electrocatalysis in direct methanol fuel cells: in-situ probing of PtRu anode catalyst surfaces

Cited by 295 publications

References 18 publications

DMFC electrode preparation, performance and proton conductivity measurements

DMFC electrode preparation, performance and proton conductivity measurements

Co-catalytic effect of nanostructured ruthenium oxide towards electro-oxidation of methanol and carbon monoxide

DMFCs: From Fundamental Aspects to Technology Development

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