Effect of Co in the efficiency of the methanol electrooxidation reaction on carbon supported Pt

Hernández-Fernández, P.; Nogueras, Manuel; Ocón, P.; Fierro, J.L.G.; Wang, H.; Abruña, Héctor D.; Rojas, Sergio

doi:10.1016/j.jpowsour.2010.06.009

Cited by 41 publications

(27 citation statements)

References 46 publications

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“…Platinum group metals and alloys are the most effective electrocatalysts for the methanol oxidation in acid media, but they have two important disadvantages besides the high cost of metals: kinetic constraints and catalyst poisoning by CO [10,11]. Nevertheless in an alkaline electrolyte, the kinetics would significantly improve as compared with the acid counterpart.…”

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confidence: 99%

Electrocatalytic oxidation of methanol on CoNi electrodeposited materials

Tarrús

Nogueras

Vallés

et al. 2014

International Journal of Hydrogen Energy

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Cobalt-nickel bimetallic materials electrodeposited on Si/Ti/Ni substrates were evaluated for the oxidation of methanol in alkaline media. CoNi samples were prepared potentiostatically selecting the adequate conditions to achieve the desired Co/Ni ratio. All samples were characterized by X-ray fluorescence and cyclic voltammetry to determine their composition and electrochemical behavior. The electrocatalytical performance of prepared samples was evaluated also by cyclic voltammetry using methanol solutions in alkaline media. Material composition, methanol and NaOH concentration, and temperature were the variables studied.The results indicate that excessive amount of cobalt inhibits the methanol oxidation reaction.In the same way, significant enhancement of the oxidation current is observed increasing the NaOH concentration up to 0.5 M, but from this value the electrocatalytic performance of these materials decreases. With regard to the increase of MeOH concentration or temperature, both variables are related to an improvement of the electrocatalytic performance. Finally, the effect of platinum skin on the CoNi deposits was evaluated, concluding that it favours MeOH oxidation but does not protect from the damage exerted by excessive NaOH concentration over the substrate surface.

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confidence: 99%

Electrocatalytic oxidation of methanol on CoNi electrodeposited materials

Tarrús

Nogueras

Vallés

et al. 2014

International Journal of Hydrogen Energy

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“…As seen in Fig. 3, TS 7-11 , TS [11][12][13][14] , and TS 14-5 are located to lie much above branch I, and so branches II and III are not expected to be competitive with branch I.…”

Section: Resultsmentioning

confidence: 97%

“…The use of bimetallic catalysts is indicated to be one of the solutions to reduce CO poisoning and improve the catalyst performance [9][10][11]. Many Ptbased bimetallic catalysts, such as PtRu [2][3][4], PtAu [5][6][7], PtCo [12], PtMo [13], and PtSn [14,15], have been found to have higher activity for the methanol dehydrogenation reaction with improved resistance to CO poisoning than pure Pt catalysts, and have been applied successfully to prototypes of commercial DMFCs. In particular, PtAu bimetallic nanoparticles, which have attracted much attention over the past twenty years [16,17], have been proposed as excellent electrocatalysts for methanol electrooxidation [5,[18][19][20][21][22][23] because Au is more stable than nonnoble metals under the DMFCs operating conditions and relatively less expensive than other noble metal materials.…”

Section: Introductionmentioning

confidence: 99%

A comparative theoretical study for the methanol dehydrogenation to CO over Pt3 and PtAu2 clusters

2011

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The density functional theory (DFT) calculations are carried out to study the mechanism details and the ensemble effect of methanol dehydrogenation over Pt(3) and PtAu(2) clusters, which present the smallest models of pure Pt clusters and bimetallic PtAu clusters. The energy diagrams are drawn out along both the initial O-H and C-H bond scission pathways via the four sequential dehydrogenation processes, respectively, i.e., CH(3)OH → CH(2)OH → CH(2)O → CHO → CO and CH(3)OH → CH(3)O → CH(2)O → CHO → CO, respectively. It is revealed that the reaction kinetics over PtAu(2) is significantly different from that over Pt(3). For the Pt(3)-mediated reaction, the C-H bond scission pathway, where an ensemble composed of two Pt atoms is required to complete methanol dehydrogenation, is energetically more favorable than the O-H bond scission pathway, and the maximum barrier along this pathway is calculated to be 12.99 kcal mol(-1). In contrast, PtAu(2) cluster facilitates the reaction starting from the O-H bond scission, where the Pt atom acts as the active center throughout each elementary step of methanol dehydrogenation, and the initial O-H bond scission with a barrier of 21.42 kcal mol(-1) is the bottom-neck step of methanol decomposition. Importantly, it is shown that the complete dehydrogenation product of methanol, CO, can more easily dissociate from PtAu(2) cluster than from Pt(3) cluster. The calculated results over the model clusters provide assistance to some extent for understanding the improved catalytic activity of bimetal PtAu catalysts toward methanol oxidation in comparison with pure Pt catalysts.

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“…Theoretical studies have found that many metals have catalytic properties for methanol oxidation, which has attracted great interest, such as Sn, Cu, Ni, Mo, etc. In recent years, many researchers have been working on the application of platinum‐based bimetallic alloy catalysts in DMFCs, such as Pt–Pd, Pt–Ag, Pt–Ru, Pt–Fe, Pt–Sn, Pt–Au, Pt–Co, Pt–Ni and Pt–Mo . The results show that these alloy catalysts have good effect on the decomposition and oxidation of methanol, while reducing the cost of raw materials and improving the tolerance towards CO poisoning .…”

Section: Introductionmentioning

confidence: 99%

Methanol dissociation and oxidation on single Fe atom supported on graphitic carbon nitride

Feng

Yang

et al. 2019

Applied Organom Chemis

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Considering environmental protection and sustainable development, fuel cells have always been an ideal choice for clean energy. For the performance of fuel cells, the anode catalysts are a key consideration. In the work reported, we designed a new type of anode catalyst, in which graphitic carbon nitride was used as the substrate and transition metal iron as the supported atom. The calculation results were characterized by adsorption energy, reaction energy barrier, potential energy surface and charge analysis. Based on density functional theory, the gradual decomposition of methanol molecules on the catalyst is realized; the decomposition products are oxidized to reduce the formation of CO, and the efficiency of anode catalysis is improved, which provides a new idea for the design of anode materials for methanol fuel cells.

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Effect of Co in the efficiency of the methanol electrooxidation reaction on carbon supported Pt

Cited by 41 publications

References 46 publications

Electrocatalytic oxidation of methanol on CoNi electrodeposited materials

Electrocatalytic oxidation of methanol on CoNi electrodeposited materials

A comparative theoretical study for the methanol dehydrogenation to CO over Pt3 and PtAu2 clusters

Methanol dissociation and oxidation on single Fe atom supported on graphitic carbon nitride

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