Preparation of Pt‐MoO<sub><i>x</i></sub>/CNT Electrode and Its Electrocatalytic Property for Ethanol Electrooxidation

Wang, Mingyong; Li, Jinhua; Cui, Kunzai

doi:10.1002/cjoc.200690168

Cited by 9 publications

(3 citation statements)

References 30 publications

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“…These high values suggest that the use of CNTs can significantly reduce the amount of expensive metal catalysts. Even higher currents and thus activities have been reported for the systems Pt/MoO x −CNT, Pt/TiO 2 −CNT, , and Pt/RuO 2 ·H 2 O−CNT …”

Section: Properties and Potential Applications Of Cnt−inorganic Hybridsmentioning

confidence: 95%

Carbon Nanotube−Inorganic Hybrids

2010

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Section: Properties and Potential Applications Of Cnt−inorganic Hybridsmentioning

confidence: 95%

Carbon Nanotube−Inorganic Hybrids

2010

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“…2,[9][10][11] Several strategies have been employed to enhance the electrocatalytic activity and the poison tolerance of Pt-based catalysts, such as through alloying with Ru, Os, Rh, and Sn or by adding a nonstoichiometric oxide ͑tungsten and ruthenium oxides͒ to tune the Pt surface electronic structure. [12][13][14][15] Combinatorial studies also indicate that ternary and quaternary alloy compositions, such as Pt-Ru-Sn, 16 Pt-Mo-Co, [17][18][19] 7,8,20 In our study, we focus on half-cell performance studies of the more established binary catalytic electrodes containing Pt and Ru in a concentrated CH 3 OH/H 2 SO 4 electrolyte solution. Previously, different approaches, such as impregnation, colloidal methods, and microemulsion, have been used to fabricate Pt-Ru electrodes of a limited number of compositions for methanol oxidation.…”

mentioning

confidence: 99%

“…2,[9][10][11] Several strategies have been employed to enhance the electrocatalytic activity and the poison tolerance of Pt-based catalysts, such as through alloying with Ru, Os, Rh, and Sn or by adding a nonstoichiometric oxide ͑tungsten and ruthenium oxides͒ to tune the Pt surface electronic structure. [12][13][14][15] Combinatorial studies also indicate that ternary and quaternary alloy compositions, such as Pt-Ru-Sn, 16 Pt-Mo-Co, [17][18][19] Pt 0.33 Ru 0.33 W 0.33 , Pt 0.44 Ru 0.41 Os 0.1 Ir 0.05 , and Pt 0.25 Ru 0.25 Ni 0.25 Zr 0.25 , possess a superior activity or stability over pure Pt as methanol oxidation catalysts. 7,8,20 In our study, we focus on half-cell performance studies of the more established binary catalytic electrodes containing Pt and Ru in a concentrated CH 3 OH/H 2 SO 4 electrolyte solution.…”

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confidence: 99%

Sputtered Pt–Ru Alloys as Catalysts for Highly Concentrated Methanol Oxidation

Jiang¹,

Gür

Prinz

et al. 2010

J. Electrochem. Soc.

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For possible catalytic anodes in direct methanol fuel cells ͑DMFCs͒ employing a 1:1 stoichiometric methanol-water reforming mixture, we have studied sputtered Pt-Ru catalysts over a wide composition range. The surface morphology of the catalyst films, determined from scanning electron microscopy studies, is rough and nanoporous and is dependent on the composition. The structure of the films has been verified as polycrystalline by X-ray diffraction analysis, which further shows that the cosputtered films are highly alloyed. The electrochemical behavior of the sputtered films has been evaluated for methanol oxidation using cyclic voltammetry and chronoamperometry in the H 2 SO 4 /CH 3 OH electrolyte at room temperature. The results indicate that Pt 0.53 Ru 0.47 is the optimal alloy composition for highly concentrated 16.6 M CH 3 OH, which corresponds to the stoichiometric fuel that will be used in next-generation DMFCs designed to mitigate methanol crossover. Long-time chronoamperometry measurements show that sputtered Pt-Ru catalysts maintain a stable performance after the initial decay.Much attention has been paid to direct methanol fuel cells ͑DMFCs͒ because they offer a highly efficient and environmentalfriendly technology for energy conversion. 1,2 Methanol has a relatively low theoretical oxidation potential ͑E o = 0.03 V͒ comparable to that of hydrogen ͑E o = 0.00 V͒ and a higher volumetric energy density ͑16 MJ L −1 ͒ even when compared to liquid hydrogen ͑9 MJ L −1 ͒. Hence, it is an attractive fuel for portable power applications. Moreover, methanol offers improved logistics over hydrogen because it is naturally a liquid at room temperature and at atmospheric pressure, and its use in DMFCs does not require preprocessing modules such as external reformers.The study presented in this paper was undertaken in the context of exploring the possibility of replacing Nafion-based hydrated polymer membranes typically employed in DMFCs with a dense ceramic-based proton-conducting membrane impervious to methanol ͑or water͒ to eliminate the persistent problem of methanol crossover. Due to the large deficiency in the proton conductivity of ceramic membranes compared to hydrated polymers, the ceramic membranes need to be fabricated very thinly and have to be pinholefree to achieve comparable transport rates while physically blocking methanol crossover. Indeed, using the atomic layer deposition method, ongoing work in our laboratory has successfully demonstrated the fabrication of high quality yttria-doped barium zirconate ͑BYZ͒ proton-conducting films that are nominally 100 nm thick. [3][4][5] At this thickness and at the nominal operating temperature of 60°C for Nafion-based DMFCs, the ohmic contribution to cell impedance from proton conduction in the ceramic membrane is expected to be comparable, albeit lower by factors of 5-10, than the 100-150 mm thick Nafion-based membranes commonly employed in DMFCs. Although such ceramic-based DMFCs are expected to operate at temperatures higher than 100°C, a similar comparison w...

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