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首页> 外文期刊>Journal of Electroanalytical Chemistry: An International Journal Devoted to All Aspects of Electrode Kinetics, Interfacial Structure, Properties of Electrolytes, Colloid and Biological Electrochemistry >An organometallic deposition of ruthenium adatoms on platinum that self poisons at a specific surface composition. A direct methanol fuel cell using a platinum-ruthenium adatom anode catalyst
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An organometallic deposition of ruthenium adatoms on platinum that self poisons at a specific surface composition. A direct methanol fuel cell using a platinum-ruthenium adatom anode catalyst

机译：钌原子在铂上的有机金属沉积，在特定的表面成分下会自毒。使用铂钌吸附原子阳极催化剂的直接甲醇燃料电池

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摘要

The organometallic precursor Ru_4(μ-H)_4(CO)_(12) (1) reacts with dihydrogen (60 atm, room temperature hexane as solvents, 3 h) over either blacked Pt gauze or Pt black powder to deposit Ru adatoms (Ru_(ad)) and CO on the Pt surface. The deposition is self-poisoned by adsorbed CO, stopping when a specific coverage of Pt by CO is reached. The results from the electrooxidation of the adsorbed CO, from base voltammograms recorded in aqueous sulfuric acid, from exhaustive anodic stripping of Ru_(ad), and from the potentiodynamic and potentiostatic electrooxidation of MeOH, all show that the deposition self-poisons after ca. 0.05 surface equivalents (moles Ru_(ad) vs. moles Pt surface) of Ru_(ad) are deposited on blacked Pt gauze. The deposition over Pt black powder self-poisons after depositing ca. 0.10 surface equivalents of Ru_(ad). A direct CH_3OH fuel cell using the resulting black Pt-Ru_(ad) powder was constructed by hot-pressing the catalyst into a Nafion membrane. Contrary to expectations, the Pt-Ru_(ad) catalyst did not lose significant amounts of surface Ru during either hot pressing the membrane electrode assembly, nor during operation of the fuel cell at 90 ℃.
机译：有机金属前体Ru_4（μ-H）_4（CO）_（12）（1）在涂黑的Pt纱布或Pt黑色粉末上与二氢（60 atm，室温己烷为溶剂，3 h）反应以沉积Ru原子（铂表面上的Ru_（ad））和CO。沉积物被吸附的CO自毒化，在CO达到Pt的特定覆盖率时停止沉积。吸附的CO的电氧化，硫酸水溶液中记录的基础伏安图，Ru_（ad）的彻底阳极汽提以及MeOH的电势和恒电位电氧化的结果均表明，约20分钟后，沉积物自毒。将Ru_（ad）的0.05当量表面（摩尔Ru_（ad）相对于摩尔Pt表面）沉积在涂黑的Pt纱网上。沉积约20毫米后，Pt黑色粉末上的沉积会自毒。 Ru_（ad）的表面等效值为0.10。通过将催化剂热压到Nafion膜中，使用所得黑色Pt-Ru_（ad）粉末构建直接CH_3OH燃料电池。与预期相反，Pt-Ru_（ad）催化剂在热压膜电极组件期间或在90℃的燃料电池运行期间都没有损失大量的表面Ru。

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