Iridium-platinum alloy nanoparticles: Composition-dependent electrocatalytic activity for formic acid oxidation
文献类型：期刊论文
| 作者 | Chen W ; Chen SW |
| 刊名 | journal of materials chemistry
 |
| 出版日期 | 2011 |
| 卷号 | 21期号:25页码:9169-9178 |
| 关键词 | METHANOL FUEL-CELLS IMIDAZOLIUM IONIC LIQUIDS RUTHENIUM NANOPARTICLES BIMETALLIC SURFACES METAL NANOPARTICLES OXYGEN REDUCTION IR NANOPARTICLES ANODE CATALYST THIN-FILM ELECTROOXIDATION |
| ISSN号 | 0959-9428 |
| 通讯作者 | chen w |
| 中文摘要 | ir(x)pt(100) (x) alloy nanoparticles with varied compositions (x = 100, 75, 67, 50, 34, and 0) were synthesized by a thermolytic process at varied ratios of the ircl(3) and ptcl(2) precursors. high-resolution transmission electron microscopic (hrtem) measurements showed that the nanoparticles all exhibited well-defined crystalline structures with the average core diameters around 2 nm; and the elemental compositions were determined by x-ray photoelectron spectroscopic (xps) measurements. the electrocatalytic activities of the ir(x)pt(100-x) nanoparticles toward formic acid oxidation were then examined by electrochemical measurements, including cyclic voltammetry (cv), chronoamperometry, and electrochemical impedance spectroscopy (eis). in the cv studies, it was found that both the current density of formic acid oxidation and the tolerance to co poisoning were strongly dependent on the composition of the iridium-platinum alloy nanoparticles, with the best performance found with the ir(50)pt(50) nanoparticles. due to heavy co poisoning, pt nanoparticles exhibited the lowest catalytic performance among the series of nanoparticles (excluding ir nanoparticles). the ir(50)pt(50) nanoparticles also showed the maximum current density and stability in chronoamperometric measurements. consistent results were obtained in electrochemical impedance spectroscopic studies of the electron transfer kinetics involved. notably, of all the nanoparticle electrocatalysts, an inductive component, i.e. negative impedance, was observed in the potential windows where co was removed by electro-oxidation; and the charge transfer resistance was found to be the lowest with the ir(50)pt(50) nanoparticles. based on the current density and peak potential of formic acid oxidation, the ratio of the anodic peak current density to the cathodic peak current density measured in cv studies, the stability manifested in chronoamperometric measurements and the tolerance to co poisoning displayed in eis measurements, the electrocatalytic performance of the irpt alloy nanoparticles was found to decrease in the order of ir(50)pt(50) > ir(67)pt(33) > ir(75)pt(25) > ir(34)pt(66) > pt. that is, among the series of irpt alloy nanoparticles, the sample with the ir/pt atomic ratio of 1 : 1 showed the highest electrocatalytic activity towards formic acid oxidation, which might be ascribed to the bifunctional reaction mechanism of bimetallic alloy electrocatalysts. |
| 收录类别 | SCI收录期刊论文 |
| 语种 | 英语 |
| WOS记录号 | WOS:000291611600034 |
| 公开日期 | 2012-06-11 |
| 源URL | [http://ir.ciac.jl.cn/handle/322003/44975]  |
| 专题 | 长春应用化学研究所_长春应用化学研究所知识产出_期刊论文 |
| 推荐引用方式 GB/T 7714 | Chen W,Chen SW. Iridium-platinum alloy nanoparticles: Composition-dependent electrocatalytic activity for formic acid oxidation[J]. journal of materials chemistry,2011,21(25):9169-9178. |
| APA | Chen W,&Chen SW.(2011).Iridium-platinum alloy nanoparticles: Composition-dependent electrocatalytic activity for formic acid oxidation.journal of materials chemistry,21(25),9169-9178. |
| MLA | Chen W,et al."Iridium-platinum alloy nanoparticles: Composition-dependent electrocatalytic activity for formic acid oxidation".journal of materials chemistry 21.25(2011):9169-9178. |
入库方式： OAI收割
来源：长春应用化学研究所
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