The role of the WO3 nanostructures in the oxygen reduction reaction and PEM fuel cell performance on WO3–Pt/C electrocatalysts

Hernández-Pichardo, M.L.; González-Huerta, Rosa de Guadalupe; Ángel, P. Del; Tufiño-Velázquez, M.; Lartundo, L.

doi:10.1016/j.ijhydene.2015.06.165

Cited by 42 publications

(19 citation statements)

References 23 publications

(29 reference statements)

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“…Due to their enhanced CO tolerance Pt/WO x electrocatalysts have been considered as potential candidates for the PEMFC anode [22,23]. The incorporation of WO 3 into the Pt/C system also resulted in increasing ORR activity [24]. Furthermore, on account of the so called "spillover effect" tungsten oxides improve the catalytic activity in the hydrogen oxidation reaction (HOR) as well [25,26].…”

Section: Introductionmentioning

confidence: 99%

Preparation of CO-tolerant anode electrocatalysts for polymer electrolyte membrane fuel cells

Gubán

Tompos

Bakos

et al. 2017

International Journal of Hydrogen Energy

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The preparation and the thorough characterization of 40 wt% Pt electrocatalysts supported on Ti (1-x) M x O 2-C (M= W, Mo; x= 0.3-0.4) composite materials with enhanced stability and efficiency is presented. W-containing composite supported catalyst with different structural characteristics were compared in order to explore the influence of the nature of the W species on the electrocatalytic performance. The assessment of the electrochemical properties of the novel catalysts revealed a correlation between the degree of W incorporation, the hydrogen spillover effect and the stability against initial leaching which influences the activity and CO tolerance of the catalysts. A preparation route for Ti 0.7 Mo 0.3 O 2-C composite with high extent of Mo incorporation was developed. No significant difference was observed in the activity, stability and CO tolerance of the W-or Mo-containing composite supported Pt catalysts with almost complete incorporation of the oxophilic dopant. Better performance of the Pt/Ti 0.7 M 0.3 O 2-C (M= W, Mo) electrocatalysts in a single cell test device using hydrogen containing 100 ppm CO compared to the reference Pt/C and PtRu/C (Quintech) catalysts was also demonstrated.

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Section: Introductionmentioning

confidence: 99%

Preparation of CO-tolerant anode electrocatalysts for polymer electrolyte membrane fuel cells

Gubán

Tompos

Bakos

et al. 2017

International Journal of Hydrogen Energy

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“…Deconvolution of the W 4f peak also shows two separate regions, viz, 4f 7/2 and 4f 5/2 , due to the spin−orbital coupling (Figure 4b). 46 As a further support to the strong Pt−W interaction, the BEs of W 4f in Pt/WO 3 -400 are found to be shifted to the higher side, compared to that in the unsupported nanorods, implying a shifting of electron density to the Pt atoms. Moreover, the core spectrum of W 4f in the unsupported WO 3 shows a decrease in the binding energy with the increase of the annealing temperature (Figure 4b).…”

Section: Resultsmentioning

confidence: 83%

“…This shift in the binding energies of Pt toward slight lower values indicates a transfer of electron density, at some level, from W to Pt, thereby establishing a strong metal–support interaction leading to the modification of the electronic structure . The increase in the electron density on Pt is expected to enhance its ability to catalyze the reduction of oxygen. ,, Hence, altogether, the detailed XPS analysis has provided insightful information and confirmation on the establishment of strong metal–support interaction in the Pt/WO 3 system, which factors a significant role both in modulating the electrochemical activity of the system toward ORR and also in enhancing the stability of the dispersed state of the Pt nanoparticles on the substrate.…”

Section: Resultsmentioning

confidence: 92%

“…The deconvoluted Pt 4f spectra, given in Figure d, show two distinct peaks corresponding to the 4f 5/2 and 4f 3/2 states originated as a result of the spin–orbital coupling. Note that the 4f peaks in the case of Pt/WO 3 -400 have been shifted to low binding energies (4f 5/2 at 74.4 eV and 4f 3/2 at 71.0 eV), compared to the Pt peaks in Pt nanoparticles supported over carbon (4f 5/2 at 74.6 eV and 4f 3/2 at 71.4 eV) . This shift in the binding energies of Pt toward slight lower values indicates a transfer of electron density, at some level, from W to Pt, thereby establishing a strong metal–support interaction leading to the modification of the electronic structure .…”

Section: Resultsmentioning

confidence: 93%

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WO₃ Nanorods Bearing Interconnected Pt Nanoparticle Units as an Activity-Modulated and Corrosion-Resistant Carbon-Free System for Polymer Electrolyte Membrane Fuel Cells

Kumar

Bhange

Soni

et al. 2020

ACS Appl. Energy Mater.

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Commercial platinum-supported carbon (Pt/C) catalyst is the most widely used oxygen reduction reaction (ORR) electrocatalyst in polymer electrolyte membrane fuel cells (PEMFCs). However, carbon oxidation in Pt/C during the operation of PEMFCs poses serious issues, particularly in meeting long-term durability of the cells. Although carbon-free Pt-based catalysts are considered to be the best alternatives, the single-cell performances reported for many such systems are found to be inferior to that of the carbon-based systems. As a practical way to realize a carbon-free electrocatalyst, we have developed a system by dispersing an interconnected Pt nanoparticle network on the nanorods of tungsten oxide (WO3). Uniform dispersion of the WO3 nanorods by fine and more or less interconnected Pt nanoparticles (20 wt %) is a key feature of the electrocatalyst. This has helped the system to achieve an intrinsic ORR characteristics which is very similar to that of Pt/C, as reflected from the comparative analysis of the onset potential, half-wave potential, limiting current density, and the number of electrons transferred in the ORR process. Pt/WO3 also shows better stability under start–stop accelerated potential cycling after 10 000 cycles, compared to Pt/C. The relative decrement in the electrochemically active surface area (ECSA) for Pt/WO3 nanorods was negligible, compared to the ∼26% decrement registered by Pt/C under the identical testing conditions. Finally, a system-level validation in a single-cell model of PEMFC by fabricating a membrane electrode assembly (MEA) with Pt/WO3 as both the anode and cathode catalyst delivered comparable output power density as that of a similar system fabricated by using Pt/C. ECSA comparison in MEA shows the potential use of Pt/WO3-400 as the catalyst for the fuel cells, since it is exhibiting an ECSA value that is 3.4 greater than that of Pt/C at a Pt loading of 0.5 mg cm–2.

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“…Inorganic metal oxides such as TiO 2 [15,[43][44][45][46][47], WO 3 [48][49][50], CeO 2 [29,30,51], Al 2 O 3 [52] SnO 2 [53] and MoO 3 [54] are very stable under the harsh fuel cell environment. These ceramic materials are not good conductors of electricity; hence, they can be only utilized as secondary support materials; they cannot be used on their own as nanocatalyst supports.…”

Section: Inorganic Support Materialsmentioning

confidence: 99%

Platinum-Based Carbon Nanodots Nanocatalysts for Direct Alcohol Fuel Cells

Gwebu¹,

Nomngongo²,

Maxakato³

2019

Nanocatalysts

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Platinum and its alloys are regarded as best nanocatalysts for the electro-oxidation of alcohol fuels especially in acidic conditions. The performance of nanocatalysts for alcohol fuel cells depends greatly on the support material. A good support material should have high surface area to obtain high metal dispersion. It should also bond and interact with the nanocatalysts to improve the activity of the overall electrode. Most importantly, the support material should offer great resistance to corrosion under the harsh fuel cell conditions. In this chapter, the use of carbon nanodots as support materials for Pt-Sn and Pt-TiO 2 nanoparticles is discussed. The electrochemical activity of Pt/CNDs, Pt-Sn/CNDs and Pt/CNDs-TiO 2 nanocatalysts was studied using cyclic voltammetry (CV) in acidic and alkaline conditions. Chronoamperometry (CA) was used to investigate the long-term stability of the nanocatalysts under the fuel cell environment. Electrochemical results demonstrated that binary Pt nanocatalysts are more active compared to monocatalysts. It was also observed that carbon nanodots are better support materials than carbon black. Blending carbon nanodots with titanium dioxide (a ceramic material) improves the corrosion resistance of the nanocatalyst. Cyclic voltammetry results also proved that alcohol electro-oxidation is enhanced in alkaline conditions.

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The role of the WO3 nanostructures in the oxygen reduction reaction and PEM fuel cell performance on WO3–Pt/C electrocatalysts

Cited by 42 publications

References 23 publications

Preparation of CO-tolerant anode electrocatalysts for polymer electrolyte membrane fuel cells

Preparation of CO-tolerant anode electrocatalysts for polymer electrolyte membrane fuel cells

WO₃ Nanorods Bearing Interconnected Pt Nanoparticle Units as an Activity-Modulated and Corrosion-Resistant Carbon-Free System for Polymer Electrolyte Membrane Fuel Cells

Platinum-Based Carbon Nanodots Nanocatalysts for Direct Alcohol Fuel Cells

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The role of the WO3 nanostructures in the oxygen reduction reaction and PEM fuel cell performance on WO3–Pt/C electrocatalysts

Cited by 42 publications

References 23 publications

Preparation of CO-tolerant anode electrocatalysts for polymer electrolyte membrane fuel cells

Preparation of CO-tolerant anode electrocatalysts for polymer electrolyte membrane fuel cells

WO3 Nanorods Bearing Interconnected Pt Nanoparticle Units as an Activity-Modulated and Corrosion-Resistant Carbon-Free System for Polymer Electrolyte Membrane Fuel Cells

Platinum-Based Carbon Nanodots Nanocatalysts for Direct Alcohol Fuel Cells

Contact Info

Product

Resources

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WO₃ Nanorods Bearing Interconnected Pt Nanoparticle Units as an Activity-Modulated and Corrosion-Resistant Carbon-Free System for Polymer Electrolyte Membrane Fuel Cells