Pt/C/MnO2 hybrid electrocatalysts for degradation mitigation in polymer electrolyte fuel cells

Trogadas, Panagiotis; Ramani, Vijay

doi:10.1016/j.jpowsour.2007.08.088

Cited by 59 publications

(55 citation statements)

References 20 publications

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“…Specifically an RDE prepared with pure MnxO1+x, was subjected to ADT by cycling it 5000 times in the same conditions used for the Pt/C-MnxO1+x (50 mV·s −1 between 0.4 and 0.8 V vs. Ag/AgCl, in a 0.5 M H2SO4 solution). Results from CV degradation ( Figure 8C) show very little degradation, sign that MnxO1+x is a stable support in acid environment, as reported in the literature as well [29,40,48,49]. Moreover, this RDE was analyzed directly by SEM coupled with EDX detector before and after ADT.…”

Section: Electro-chemical Characterizationsupporting

confidence: 72%

“…This re-arrangement is not a stable condition, but a reversible process. In fact, as observed for Pt/C-MnxO1+x during CO stripping analysis (Figure 6), Pt nanoparticles agglomeration can evolve to more disperse Pt nanoparticles or different Pt nano-shape islands depending on the stress cycling adopted for accelerated degradation procedure [47,48]. To better check stability of the Pt/C-MnxO1+x and in particular of the MnxO1+x support, the extra MnxO1+x sample used for μRS analysis (Figure 4) was used to assess its stability in acid conditions.…”

Section: Electro-chemical Characterizationmentioning

confidence: 89%

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The Use of C-MnO2 as Hybrid Precursor Support for a Pt/C-MnxO1+x Catalyst with Enhanced Activity for the Methanol Oxidation Reaction (MOR)

et al. 2015

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Platinum (Pt) nanoparticles are deposited on a hybrid support (C-MnO2) according to a polyol method. The home-made catalyst, resulted as Pt/C-MnxO1+x, is compared with two different commercial platinum based materials (Pt/C and PtRu/C). The synthesized catalyst is characterized by means of FESEM, XRD, ICP-MS, XPS and μRS analyses. MnO2 is synthesized and deposited over a commercial grade of carbon (Vulcan XC72) by facile reduction of potassium permanganate in acidic solution. Pt nanoparticles are synthesized on the hybrid support by a polyol thermal assisted method (microwave irradiation), followed by an annealing at 600 °C. The obtained catalyst displays a support constituted by a mixture of manganese oxides (Mn2O3 and Mn3O4) with a Pt loading of 19 wt. %. The electro-catalytic activity towards MOR is assessed by RDE in acid conditions (0.5 M H2SO4), evaluating the ability to oxidize methanol in 1 M concentration. The synthesized Pt/C-MnxO1+x catalyst shows good activity as well as good stability compared to the commercial Pt/C based catalyst.

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Section: Electro-chemical Characterizationsupporting

confidence: 72%

Section: Electro-chemical Characterizationmentioning

confidence: 89%

The Use of C-MnO2 as Hybrid Precursor Support for a Pt/C-MnxO1+x Catalyst with Enhanced Activity for the Methanol Oxidation Reaction (MOR)

et al. 2015

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“…However, carbon oxidation during fuel-cell operation leads to significant degradation because of aggregation and dissolution of Pt particles. [3] Metal oxides (e.g., SnO 2 , [4] WO x , [5] CeO 2 , [6] MnO 2 , [7] and TiO 2 [8] ) that have high stability under fuel-cell operating conditions are beneficial for improving the catalytic performance of catalysts. This is because of strong metal-support interactions (SMSIs) between the metals and the metal oxides, which can promote absorption of oxygen or fuels onto the catalyst surface.…”

Section: Introductionmentioning

confidence: 99%

Supported Noble Metals on Hydrogen‐Treated TiO₂ Nanotube Arrays as Highly Ordered Electrodes for Fuel Cells

Zhang

et al. 2013

ChemSusChem

103

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Hydrogen‐treated TiO2 nanotube (H–TNT) arrays serve as highly ordered nanostructured electrode supports, which are able to significantly improve the electrochemical performance and durability of fuel cells. The electrical conductivity of H–TNTs increases by approximately one order of magnitude in comparison to air‐treated TNTs. The increase in the number of oxygen vacancies and hydroxyl groups on the H–TNTs help to anchor a greater number of Pt atoms during Pt electrodeposition. The H–TNTs are pretreated by using a successive ion adsorption and reaction (SIAR) method that enhances the loading and dispersion of Pt catalysts when electrodeposited. In the SIAR method a Pd activator can be used to provide uniform nucleation sites for Pt and leads to increased Pt loading on the H‐TNTs. Furthermore, fabricated Pt nanoparticles with a diameter of 3.4 nm are located uniformly around the pretreated H–TNT support. The as‐prepared and highly ordered electrodes exhibit excellent stability during accelerated durability tests, particularly for the H–TNT‐loaded Pt catalysts that have been annealed in ultrahigh purity H2 for a second time. There is minimal decrease in the electrochemical surface area of the as‐prepared electrode after 1000 cycles compared to a 68 % decrease for the commercial JM 20 % Pt/C electrode after 800 cycles. X‐ray photoelectron spectroscopy shows that after the H–TNT‐loaded Pt catalysts are annealed in H2 for the second time, the strong metal–support interaction between the H–TNTs and the Pt catalysts enhances the electrochemical stability of the electrodes. Fuel‐cell testing shows that the power density reaches a maximum of 500 mW cm−2 when this highly ordered electrode is used as the anode. When used as the cathode in a fuel cell with extra‐low Pt loading, the new electrode generates a specific power density of 2.68 kW gPt−1. It is indicated that H–TNT arrays, which have highly ordered nanostructures, could be used as ordered electrode supports.

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“…Gustavsson et al [29] and Trogadas and Ramani [30] also showed that the combination of Pt with metal oxides can increase the catalytic activity towards the oxygen reduction. Gustavsson et al [29] used a TiO 2 layer between platinum and Nafion.…”

Section: Optimized Amounts Of Perovskites and Ptmentioning

confidence: 98%

“…The better performance of this arrangement was attributed to a better dispersion of Pt on TiO 2 compared to Nafion and in addition, substantial proton conduction through the thin TiO 2 layer. Trogadas and Ramani [30] demonstrated that a Pt/C/MnO 2 hybrid catalyst leads to 50% less production of hydrogen peroxide compared to Pt/C.…”

Section: Optimized Amounts Of Perovskites and Ptmentioning

confidence: 99%

Combined platinum/perovskite catalyst for an efficient nanostructured air electrode

Thiele

2010

Materials Chemistry and Physics

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This work shows the stepwise improvement of air electrodes by the right combination of catalysts. In all electrodes carbon nanotubes serve as carbon support. The electrodes are produced by ultrasonic mixing of the carbon nanotubes and the catalysts. Their catalytic activity towards oxygen reduction in alkaline solution is evaluated by polarisation curves and electrochemical impedance spectroscopy. In a first step La 1−x Sr x MnO 3 perovskites are investigated, as well as La 0.65 Sr 0.35 MnO 3 and La 0.6 Sr 0.4 CoO 3 are compared. It is found that La 0.65 Sr 0.35 MnO 3 and La 0.6 Sr 0.4 CoO 3 have a positive impact on different parts of the current-potential curve. In a second step the influence of small amounts of platinum as an additional catalyst besides the perovskite is analyzed with the result that platinum lowers significantly the activation polarisation. Finally, the optimum composition of the electrode is found by using the synergetic effect of platinum, La 0.65 Sr 0.35 MnO 3 and La 0.6 Sr 0.4 CoO 3 .

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Pt/C/MnO2 hybrid electrocatalysts for degradation mitigation in polymer electrolyte fuel cells

Cited by 59 publications

References 20 publications

The Use of C-MnO2 as Hybrid Precursor Support for a Pt/C-MnxO1+x Catalyst with Enhanced Activity for the Methanol Oxidation Reaction (MOR)

The Use of C-MnO2 as Hybrid Precursor Support for a Pt/C-MnxO1+x Catalyst with Enhanced Activity for the Methanol Oxidation Reaction (MOR)

Supported Noble Metals on Hydrogen‐Treated TiO₂ Nanotube Arrays as Highly Ordered Electrodes for Fuel Cells

Combined platinum/perovskite catalyst for an efficient nanostructured air electrode

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Pt/C/MnO2 hybrid electrocatalysts for degradation mitigation in polymer electrolyte fuel cells

Cited by 59 publications

References 20 publications

The Use of C-MnO2 as Hybrid Precursor Support for a Pt/C-MnxO1+x Catalyst with Enhanced Activity for the Methanol Oxidation Reaction (MOR)

The Use of C-MnO2 as Hybrid Precursor Support for a Pt/C-MnxO1+x Catalyst with Enhanced Activity for the Methanol Oxidation Reaction (MOR)

Supported Noble Metals on Hydrogen‐Treated TiO2 Nanotube Arrays as Highly Ordered Electrodes for Fuel Cells

Combined platinum/perovskite catalyst for an efficient nanostructured air electrode

Contact Info

Product

Resources

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Supported Noble Metals on Hydrogen‐Treated TiO₂ Nanotube Arrays as Highly Ordered Electrodes for Fuel Cells