Nanoparticle Size Effects on Methanol Electrochemical Oxidation on Carbon Supported Platinum Catalysts

Bergamaski, Kleber; Pinheiro, Alexei Lorenzetti Novaes; Teixeira‐Neto, Érico; Nart, Francisco Carlos

doi:10.1021/jp063337h

Cited by 146 publications

(132 citation statements)

References 28 publications

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“…Nanoparticle size effects on methanol electrochemical oxidation on Pt/C catalysts was studied using differential electrochemical mass spectrometry under both potentiodynamic and potentiostatic conditions (165). While the particle size effect in this reaction is usually regarded as a reflection of different Pt-CO and Pt-OH bond strengths for different particle sizes, the authors (165) focused mainly on the mechanism of methanol dehydrogenation on platinum which is crucial for the optimization of the methanol electrooxidation efficiency by favouring the CO 2 formation pathway.…”

Section: Methanol and Formic Acid Oxidationmentioning

confidence: 99%

Recent Advances in the Liquid‐Phase Synthesis of Metal Nanostructures with Controlled Shape and Size for Catalysis

2009

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Section: Methanol and Formic Acid Oxidationmentioning

confidence: 99%

Recent Advances in the Liquid‐Phase Synthesis of Metal Nanostructures with Controlled Shape and Size for Catalysis

2009

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“…催化剂比表面积受催化剂粒度控制, 催化剂尺寸越小, 其比表面积越大, 有关粒度对其催化剂性能的影响已有相关研究 [106,107] . Frelink 等 Bergamaski 等 [111] 采用微分电化学质谱技术研究了不同粒径的粒子催化活性的不同, 从定量的角度更为直观地揭示了粒径对催化活性的影响.…”

Section: 催化剂的粒度unclassified

“…Frelink 等 Bergamaski 等 [111] 采用微分电化学质谱技术研究了不同粒径的粒子催化活性的不同, 从定量的角度更为直观地揭示了粒径对催化活性的影响. 研究发现, 粒径在 3～10 nm 之间的催化剂催化性能最佳, 粒径过小, Pt 表面连续的活性位点浓度下降, 而粒径过大, 甲醛的解吸效应加重.…”

Section: 催化剂的粒度unclassified

“…以 P 掺杂的 MCNTs 作为 Pt 的催化剂载体, 不仅能够降低催化剂粒子的粒径, 提高催化剂利用率, 还可以改变 Pt 的电子云密度, 减弱反应中间体的不可逆吸附, 从而使得 Pt/P-MCNTs 复合催化剂对甲醇氧化具有更高的催化活性和稳定性 [69] . (110)＞Pt (100)＞Pt (111). 甲醇的氧化主要包括两种途径: (1)甲醇直接被氧化为 CO 2 而没有经过中间体过程; (2)间接氧化, CO 作为主要中间体 [75] .…”

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Research Progress on Pt-Based Anode Catalysts in the Direct Methanol Fuel Cell

Wang¹,

Shi²,

Xia³

et al. 2013

Acta Chim. Sinica

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In the past decades, fuel cells have emerged as an ideal device for energy storage and conversion owing to their high-energy conversion efficiency and low pollutant emission. Among various fuel cells, direct methanol fuel cells (DMFCs) appear to be one of the most promising systems because of their low operating temperatures, high energy density and easy transportation. However, it is known that the widespread commercial application of these cells is hindered by the high cost due to the exclusive use of platinum and platinum alloy catalysts. Thus, it is of great scientific and practical importance to exploit relatively inexpensive and highly active electrocatalysts for methanol oxidation. Although the utilization of non-noble catalysts may bring cost reduction to a certain degree, the excessively low performance is far below the commercial standard. Additionally, the formation and accumulation of intermediate species, such as CO ad and CHO ad , which strongly adsorbed on the Pt surface, can substantially limit the efficience of the catalyst. Two main mechanisms are widely accepted to explain this improved tolerance to CO. As to the bifunctional mechanism model, a second metal can provide oxygenated species at lower potentials for oxidative removal of adsorbed CO. According to the intrinsic or ligand mechanism, the integrated metal modifies the electronic structure of Pt atoms, lowering the adsorption energy of CO ads and facilitating the oxidation of CO ads at a lower potential. Therefore, it seems that the modification or optimization based on monometallic Pt catalyst may be more practical. To our best understanding, the macroscopic structure of the catalyst plays a significant role in determining its intrinsic electronic construction. Hence, it is reasonable to improve the performance of the catalyst through monitoring its macroscopic properties to change the microscopic structure. In this paper, recent research progresses on the various approaches for the performance elevation of the anode catalyst have been summarized, mainly focusing on the composition, the morphology and the granularity. Especially the modification mechanisms have also been discussed. Keywords direct methanol fuel cell; Pt based catalyst; synergistic effect; electronic effect; spillover effect

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“…[5][6][7] The size effects of nanoparticles have also been reported, indicating that the surface morphologies are important in elctrocatalytic oxidations of compounds such as carbon monoxide, methanol, and formic acid. [8][9][10][11] Hence, systematic studies are required to produce suitable surface morphologies, such as micro-or nano-structures, and obtain an understanding of their correlated effects on catalytic electrode reactions.…”

Section: Introductionmentioning

confidence: 99%

Monitoring of the Transfer of Tetrachloroaurate(III) Ions by Thin-layer Electrochemistry and Electrochemical Deposition of Metallic Gold over a Graphite Electrode

Song¹,

Shin²,

Kang

2008

Bulletin of the Korean Chemical Society

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This study demonstrates the electrochemical conversion of the synthetic procedure of monolayer-protected clusters using a thin toluene layer over an edge plane pyrolytic graphite electrode. A thin toluene layer with a thickness of 0.31 mm was coated over the electrode and an immiscible liquid/liquid water/toluene interface was introduced. The transfer of the tetrachloroaurate (AuCl 4 − ) ions into the toluene layer interposed between the aqueous solution and the electrode surface was electrochemically monitored. The AuCl 4 − ions initially could not move through into the toluene layer, showing no reduction wave, but, in the presence of the phase transfer reagent, tetraoctylammonium bromide (TOABr), a cathodic wave at 0.23 V vs. Ag/AgCl was observed, indicating the reduction of the transferred AuCl 4 − ions in the toluene layer. In the presence of dodecanethiol together with TOABr, a self-assembled monolayer was formed over the electro-deposited metallic gold surface. The FE-SEM image of the surface indicates the formation of a highly porous metallic gold surface, rather than individual nanoparticles, over the EPG electrode.

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Nanoparticle Size Effects on Methanol Electrochemical Oxidation on Carbon Supported Platinum Catalysts

Cited by 146 publications

References 28 publications

Recent Advances in the Liquid‐Phase Synthesis of Metal Nanostructures with Controlled Shape and Size for Catalysis

Recent Advances in the Liquid‐Phase Synthesis of Metal Nanostructures with Controlled Shape and Size for Catalysis

Research Progress on Pt-Based Anode Catalysts in the Direct Methanol Fuel Cell

Monitoring of the Transfer of Tetrachloroaurate(III) Ions by Thin-layer Electrochemistry and Electrochemical Deposition of Metallic Gold over a Graphite Electrode

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