PtRu/C electrocatalysts prepared using electron beam irradiation

Silva, Dionísio Furtunato da; Neto, Almir Oliveira; Pino, Eddy S.; Brandalise, Michele; Linardi, Marcelo; Spinacé, Estevam V.

doi:10.1590/s1516-14392007000400008

Cited by 14 publications

(3 citation statements)

References 22 publications

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“…The mechanism of this radiochemical method has been described previously. [11,12,23] The typical preparation procedure for the EBIRM and the used materials are given as follows. Hexachloroplatinic acid hexahydrate (H 2 PtCl 6 ¢6H 2 O, Wako Pure Chemical Industries, Japan) and ruthenium trichloride hydrate (RuCl 3 ¢nH 2 O, n D 1À3, Wako Pure Chemical Industries) were used as the Pt and Ru precursors, respectively.…”

Section: Synthesis Of Ptru/cmentioning

confidence: 99%

“…[11,12] A belt conveyor system using a cart has been adopted for the irradiation, wherein the irradiation time is less than 10 s. Therefore, this method is suitable for the mass production of nanoparticle catalysts. Previously, we reported the synthesis of monometallic nanoparticles on support materials, such as Au/Fe 3 O 4 [12] and Pt/TiO 2 , [13] using an EBIRM.…”

Section: Introductionmentioning

confidence: 99%

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Mass production of highly loaded and highly dispersed PtRu/C catalysts for methanol oxidation using an electron-beam irradiation reduction method

Ohkubo

Kageyama

Seino

et al. 2015

Journal of Experimental Nanoscience

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An electron-beam irradiation reduction method (EBIRM) is a technique to reduce metal ions in an aqueous solution via irradiation with a high-energy electron beam. In this study, an EBIRM is improved to develop a technique for the mass production of highly loaded and highly dispersed PtRu/C catalysts for use as direct methanol fuel cell anodes. An increase in the Pt and Ru input concentrations increased the loading weight from 9 to 37 wt%; however, the dispersibility of the PtRu nanoparticles on the carbon particles decreased. To improve the low dispersibility, sodium phosphinate was added to the precursor solution and the input amount of carbon particles was decreased. These changes resulted in not only highly loaded but also highly dispersed PtRu/C catalysts. The catalytic activity of the highly loaded and highly dispersed PtRu/C catalysts for methanol oxidation was at least 1.6 times higher than that of the lowly loaded and lowly dispersed PtRu/C catalysts in all voltage range. More than 6000 mg of highly loaded and highly dispersed PtRu/C catalysts were relatively easily obtained, and the average particle size of the PtRu nanoparticles was 1.8 nm. These results demonstrated that the improved EBIRM is effective for the mass production of carbon-supported, highly loaded, and highly dispersed metal nanoparticles.

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Section: Synthesis Of Ptru/cmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mass production of highly loaded and highly dispersed PtRu/C catalysts for methanol oxidation using an electron-beam irradiation reduction method

Ohkubo

Kageyama

Seino

et al. 2015

Journal of Experimental Nanoscience

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“…Chang et al [142] Silva et al [150] prepararam os eletrocatalisadores PtRu/C para oxidação eletroquímica de metanol. Os eletrocatalisadores PtRu/C foram sintetizados em meio de reação de água/etilenoglicol, utilizando feixe de elétrons para irradiação, que permite uma alta dose (kGy) dentro de alguns minutos.…”

Section: Método De Deposição Espontâneaunclassified

Estudo da oxidação eletroquímica do ácido fórmico utilizando eletrocatalisadores Pd/C-Sb2O5.SnO2, PdAu/C-Sb2O5.SnO2, PdIr/C-Sb2O5.SnO2 e PdAulr/C-Sb2O5.SnO2 preparados via redução por borohidreto de sódio

Nandenha¹

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Effect of organic stabilizers on Pt–Cu nanoparticle structure in liquid-phase syntheses: control of crystal growth and copper reoxidation

et al. 2016

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The effect of organic stabilizers on the structure of supported Pt-Cu nanoparticles was investigated for liquid-phase reduction methods. The crystallite size and copper content of Pt-Cu alloy nanoparticles decreased as the number of carboxylate groups in an employed stabilizer molecule increased (acetate [ succinate [ citrate). The steric and inductive effects of carboxylate groups suppress the reduction and crystal growth of platinum to increase the chance for copper to make alloy with platinum, but at the same time they destabilize metallic copper resulting in a segregation of copper as oxides. In a radiolytic synthesis method, the size and Cu content in Pt-Cu nanoparticles were similarly reduced in the presence of citrate, but the copresent reduction enhancer also had a strong influence. The final particle structure was controlled by the kinetics of reduction of metal precursors and the thermodynamics of metal-stabilizer complexes.

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PtRu/C electrocatalysts prepared using electron beam irradiation

Cited by 14 publications

References 22 publications

Mass production of highly loaded and highly dispersed PtRu/C catalysts for methanol oxidation using an electron-beam irradiation reduction method

Mass production of highly loaded and highly dispersed PtRu/C catalysts for methanol oxidation using an electron-beam irradiation reduction method

Estudo da oxidação eletroquímica do ácido fórmico utilizando eletrocatalisadores Pd/C-Sb2O5.SnO2, PdAu/C-Sb2O5.SnO2, PdIr/C-Sb2O5.SnO2 e PdAulr/C-Sb2O5.SnO2 preparados via redução por borohidreto de sódio

Effect of organic stabilizers on Pt–Cu nanoparticle structure in liquid-phase syntheses: control of crystal growth and copper reoxidation

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