Oxygen reduction on carbon supported Pt and PtRu catalysts in alkaline solutions

Jiang, Luhua; Hsu, Andrew T.; Chu, Deryn; Chen, Rongrong

doi:10.1016/j.jelechem.2009.01.029

Cited by 68 publications

(48 citation statements)

References 45 publications

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“…The obtained values are in good agreement with −118 mVdec −1 (−2.3× 2RT/F), which corresponds to the mechanism that involves one-electron discharge-determining step. This result is in agreement with literature data for PtRu electrodes [33].…”

Section: Electrochemical Behavior Of Modified Zeolites In 01 M Naoh supporting

confidence: 94%

The electrochemical behavior of PtRu- and Pt-modified zeolite X in alkaline solution

Mojović

Mudrinić

Banković

et al. 2013

J Solid State Electrochem

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Zeolite NaX was modified by Pt and Pt/Ru nanodispersed metallic clusters. The procedure of impregnation with acetylacetonate salt/acetone solution was applied. Scanning electron microscope analysis confirmed partial zeolite framework destruction. According to energy dispersive X-ray analysis, Pt/Ru ratio in sample was about 1. Electrochemical behavior of PtRu-and Pt-modified zeolites was investigated in alkaline solutions, 5 mM NaOH+1 M Na 2 SO 4 and 0.1 M NaOH. The shape of cyclic voltammograms of 13XPtRu electrode, recorded in slightly alkaline solution, was greatly affected by the presence of hydrogen that remained in the sample after synthetic procedure. Oxygen reduction reaction (ORR) was investigated in an O 2 -saturated aqueous 0.1-M NaOH solution. The obtained Tafel slopes indicated ORR mechanism that involves one-electron discharge-determining step. According to Koutecky-Levich slope, the oxygen reduction reaction followed 4e − mechanism on both 13XPtRu and 13XPt electrode. The onset of ORR on 13XPtRu electrode was shifted toward more positive potentials in comparison to 13XPt electrode.

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Section: Electrochemical Behavior Of Modified Zeolites In 01 M Naoh supporting

confidence: 94%

The electrochemical behavior of PtRu- and Pt-modified zeolite X in alkaline solution

Mojović

Mudrinić

Banković

et al. 2013

J Solid State Electrochem

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“…However, in acidic medium for PEMFCs, CN x nanotubes exhibit a moderate catalytic activity with a two-electron pathway due to the impaired electrokinetics of the ORR, compared to the case in alkaline solution. [1,23] In this case, the advantages of the CN x nanotubes mainly rest with the convenient immobilization and modification of Pt-based species. As presented in this study, binary Pt-Co/CN x electrocatalysts could be facilely constructed and show much better performance than the commercial Pt/C and monometallic Pt/CN x catalysts, which suggests their important potential for the ORR of PEMFCs.…”

mentioning

confidence: 99%

Facile Construction of Pt–Co/CN_x Nanotube Electrocatalysts and Their Application to the Oxygen Reduction Reaction

Jiang¹,

Ma²,

Jian³

et al. 2009

Advanced Materials

203

104

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“…and 60 mV/dec. 45,46 The 60 mV/dec. indicates the rate-limiting step for the ORR and the 120 mV/dec.…”

Section: 38mentioning

confidence: 99%

Various Carbon Chain Containing Linkages Grafted Graphene with Silver Nanoparticles Electrocatalysts for Oxygen Reduction Reaction

Lee

Ahmed

Jeon

2014

J. Electrochem. Soc.

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In this study, we have synthesized an efficient catalyst by various carbon chain containing linkers grafted graphene with silver nanoparticles (AgNPs)-decorated GO-S-(CH 2 ) x -SH (where x = 2, 3, 4 and denoted as GO-C x -Ag) for oxygen reduction reaction (ORR). The structural and morphological properties have investigated via several instrumental methods. Among those catalysts, the GO-C 2 -Ag has showed an excellent electrocatalytic performance by cyclic voltammetry (CV) and hydrodynamic techniques for ORR in alkaline media. Hydrodynamic voltammetry reveals that the GO-C 2 -Ag modified electrode has catalyzed effectively at higher potential. The overall electrocatalytic results showed that the GO-C 2 -Ag has better activity toward ORR and demonstrated nearly four electron transfer pathway into H 2 O due to much grafting of linker molecule and smaller size of AgNPs. The value of transferred electron number (n) and other kinetic parameters have demonstrated that the GO-C 2 -Ag is highly facilitated than that of GO-Ag and other GO-C x -Ag to electrocatalytic oxygen reduction. Graphene, which is discovered by Geim's group in UK in 2004, is composed of a single sheet of conjugated sp 2 carbon atoms packed into a honeycomb crystal structure.1 It is an attractive material due to its unique physical and chemical properties such as its outstanding thickness, tensile strength (130 Gpa), thermal conductivity (5,300 W/mK), allowable current density (108 A/cm 2 ), and mobility (200,000 cm 2 /Vs). 2-5 However, the oxidized graphene (GO) surface is highly functionalized with oxygenated groups, such as ketones, epoxides, hydroxyls and carboxylates, 6 which make them targets for covalent modification. Graphene has been recognized and used as an important material in various technologies in chemistry such as, displays, rechargeable batteries, solar cells, automobiles, fuel cells (FCs). 7 In recent years, due to global warming, energy issues are in the spotlight. Thus, many studies have been conducted on carbon nanomaterials supported metal nanoparticles (NPs) for both anodic and cathodic reactions in FCs including oxygen reduction reaction (ORR).ORR is important for energy conversion systems in FCs 7,8 and metal air batteries. 9 It is well-known that a platinum (Pt)-based catalyst in an acidic solution has the highest chemical stability among electrochemically active catalysts. However, Pt-based catalysts are too expensive to make FCs commercially viable. Under acidic conditions, due to the high dissociation energy (494 kJ/mol) of oxygen molecules, electrochemical oxygen reduction requires a high overpotential, and the reaction rate is slow.10 Moreover, Pt has suffered several problems such as, poor drivability and toxic effects of methanol crossover/carbon monoxide in direct methanol fuel cells (DMFCs).In the last few years, because of these shortcomings of Pt-based electrocatalysts, studies have been conducted to develop alternative non Pt catalysts. Typical alternative metallic catalysts are included with several metals such ...

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Oxygen reduction on carbon supported Pt and PtRu catalysts in alkaline solutions

Cited by 68 publications

References 45 publications

The electrochemical behavior of PtRu- and Pt-modified zeolite X in alkaline solution

The electrochemical behavior of PtRu- and Pt-modified zeolite X in alkaline solution

Facile Construction of Pt–Co/CN_x Nanotube Electrocatalysts and Their Application to the Oxygen Reduction Reaction

Various Carbon Chain Containing Linkages Grafted Graphene with Silver Nanoparticles Electrocatalysts for Oxygen Reduction Reaction

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Oxygen reduction on carbon supported Pt and PtRu catalysts in alkaline solutions

Cited by 68 publications

References 45 publications

The electrochemical behavior of PtRu- and Pt-modified zeolite X in alkaline solution

The electrochemical behavior of PtRu- and Pt-modified zeolite X in alkaline solution

Facile Construction of Pt–Co/CNx Nanotube Electrocatalysts and Their Application to the Oxygen Reduction Reaction

Various Carbon Chain Containing Linkages Grafted Graphene with Silver Nanoparticles Electrocatalysts for Oxygen Reduction Reaction

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Facile Construction of Pt–Co/CN_x Nanotube Electrocatalysts and Their Application to the Oxygen Reduction Reaction