Effect of Mo incorporation on the electrocatalytic performance of Ti–Mo mixed oxide–carbon composite supported Pt electrocatalysts

Vass, Ádám; Borbáth, Irina; Pászti, Zoltán; Bakos, I.; Sajó, István E.; Németh, Péter; Tompos, András

doi:10.1007/s11144-017-1155-5

Cited by 16 publications

(52 citation statements)

References 44 publications

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“…As it was described in our earlier works [40,41] [55]) and as a broad band with leading peak at 230.0 eV (Mo 4+ , [56,57]), respectively. In this work, the Mo 3d core level spectrum from Mo 4+ species was modelled by a complex line shape consisting of a combination of a narrower and a broad spinorbit splitted doublet representing differently screened final states, with the most intense contribution between 229-230 eV [56,57].…”

Section: Resultssupporting

confidence: 65%

“…The powder was dried at 80°C overnight. Detailed description of the synthesis procedure can be found in our previous studies [40,41]. The obtained powder has been submitted to high-temperature treatment (600°C, 8h, Ar flow).…”

Section: Preparation Of Ti 06 Mo 04 O 2 -C Support Materials and Ptmentioning

confidence: 99%

“…The support material was loaded with 20 wt.% Pt via the previously used modified NaBH 4 -assisted ethylene-glycol reduction-precipitation method [40,41]. The materials were washed with water by centrifugation and dried at 80°C overnight.…”

Section: Preparation Of Ti 06 Mo 04 O 2 -C Support Materials and Ptmentioning

confidence: 99%

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Novel Pt Electrocatalysts: Multifunctional Composite Supports for Enhanced Corrosion Resistance and Improved CO Tolerance

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The electrochemical peculiarities of novel 20 wt.% Pt electrocatalysts supported on Ti 0.6 Mo 0.4 O 2 -C composite materials in low-potential CO oxidation reaction (LPCOR) were investigated. The oxidation of CO on the Mo-containing Pt-based catalyst commences at exceptionally low potential values (ca. 100 mV). The results suggest that only CO adsorbed on specific Pt sites, where Pt and Mo atoms are in atomic closeness, can be oxidised below 400 mV potential. When the weakly bounded CO is oxidized, some hydrogen adsorption can take place on the released surface, although this amount is much smaller than in the case of a CO-free Pt surface. The Pt/Ti 0.6 Mo 0.4 O 2 -C catalyst loses its activity in LPCOR when Mo becomes oxidized (above ca. 400 mV). Accordingly, presence of Mo species in lower oxidation state than 6+ is supposed to have crucial role in CO oxidation. Nevertheless, rereduction of oxidized Mo species formed above 400 mV is strongly hindered when adsorbed CO species are still present. Note that CO ads species can be completely removed only above 550 mV. Oxidized Mo species can be re-reduced and the activity in the LPCOR can be restored if the platinum surface is CO-free. Clear correlation between the so-called "pre-

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Section: Resultssupporting

confidence: 65%

Section: Preparation Of Ti 06 Mo 04 O 2 -C Support Materials and Ptmentioning

confidence: 99%

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Novel Pt Electrocatalysts: Multifunctional Composite Supports for Enhanced Corrosion Resistance and Improved CO Tolerance

et al. 2018

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“…To overcome this problem, a composite support was proposed, in which the oxophilic metal co-catalyst is incorporated into a TiO 2 matrix which provides long term stability, while the good electrical conductivity and high surface area of the system is ensured by an active carbon backbone. The preparation and the thorough characterization of Pt electrocatalysts deposited onto Ti 0.7 M 0.3 O 2 -C (M= W, Mo) composites was presented in our recent studies [52][53][54].…”

Section: Molybdenum Oxides Include Five Magnéli Phases With Compositimentioning

confidence: 99%

Design and Investigation of Molybdenum Modified Platinum Surfaces for Modeling of CO Tolerant Electrocatalysts

et al. 2018

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Mo overlayers were prepared on smooth polycrystalline platinum and platinized platinum electrode surfaces by in situ electrochemical deposition of molybdenum oxide at potential below 500 mV for modeling Mo-Pt electrocatalysts. Correlations were found between the applied potential and the amount of deposited Mo, which never exceeded a monolayer, thus Pt-Mo bonds stabilize the deposited Mo oxide. Electrochemical measurements suggested that Mo deposited from a Mo(VI) solution was reduced to the 4+ oxidation state. In line with the ex situ XPS findings a certain part (20-25%) of the initial Mo layer remained irreversibly adsorbed on the Pt/Pt electrode even after oxidation into the 6+ state at high potentials; this fractional monolayer cannot be dissolved even by prolonged cyclic polarization up to 1000 mV. It has been demonstrated that the irreversibly bound Mo partial monolayer is enough to change significantly the CO poisoning properties of the Pt surface. On this Mo:Pt (1:4) surface CO oxidation is initiated at extremely low potentials (ca. 100 mV). Moreover, only Pt modified by Mo(IV) species is active in low-potential CO oxidation reaction as after oxidizing the irreversibly adsorbed Mo to the 6+ state, CO oxidation is no longer observable. Nevertheless, the catalyst can be reactivated by reduction of molybdenum into the 4+ oxidation state. However, this reduction requires clean, CO-free Pt surface. If Pt is largely covered by CO, reduction of Mo(VI) into Mo(IV) does not occur and thus the low potential CO oxidation remains hindered.

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“…Not only that, doping also provides a feasible approach to further tuning the electronic structure of TiO 2 , which usually gives rise to new states of TiO 2 material. Doping elements involve metals and non‐metals: Mo‐doping can further improve the intrinsic CO tolerance of TiO 2 , and thus the complex could be served as a better support for loading Pt . Li et al .…”

Section: Ti Si‐based Supportsmentioning

confidence: 99%

Synergistic Supports Beyond Carbon Black for Polymer Electrolyte Fuel Cell Anodes

Huang

Babu

et al. 2018

ChemCatChem

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Polymer electrolyte fuel cells (PEFCs) are among the most advanced energy technologies with low operating temperatures, high energy densities, ease of transportation and storage. However, the deficiencies such as low activity and high cost of the electrocatalysts at anodes greatly hinder their commercialization. The commonly used carbon black supports lack the capacity of regulation over the supported noble metals towards efficient electro‐catalytic oxidation of fuels. In this Mini‐Review, the prerequisite factors in advanced supports are outlined, ranging from self‐supported precious metal alloys as well as non‐noble metal materials, while simultaneously revealing the superiorities of some advanced supports beyond carbon black in terms of electronic conductivity, synergy with surface precious metals, chemical and electrochemical stability, and other possible interactions. The effects arisen from microscopic morphology, nano‐structure, and composition on the electrocatalytic activity/stability are also discussed. Finally, several of the most promising supports are highlighted, and the research trends of synergistic supports in future PEFCs are predicted.

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Effect of Mo incorporation on the electrocatalytic performance of Ti–Mo mixed oxide–carbon composite supported Pt electrocatalysts

Abstract: Electronic supplementary material:The online version of this article (doi: 10.1007/s11144-017-1155-5) contains supplementary material, which is available to authorized users. Effect of Mo incorporation

Cited by 16 publications

References 44 publications

Novel Pt Electrocatalysts: Multifunctional Composite Supports for Enhanced Corrosion Resistance and Improved CO Tolerance

Novel Pt Electrocatalysts: Multifunctional Composite Supports for Enhanced Corrosion Resistance and Improved CO Tolerance

Design and Investigation of Molybdenum Modified Platinum Surfaces for Modeling of CO Tolerant Electrocatalysts

Synergistic Supports Beyond Carbon Black for Polymer Electrolyte Fuel Cell Anodes

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