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Platinum particles deposited on synthetic boron-doped diamond surfaces: application to methanol oxidation

机译:铂粒子沉积在掺硼的人造金刚石表面上:在甲醇氧化中的应用

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摘要

Two methods have been used for the deposition of Pt particles on synthetic boron-doped diamond (BDD) surfaces: chemical deposition and electrodeposition under potentiostatic conditions. However, electrodeposition leads much higher platinum dispersion than chemical deposition. The mechanism of nucleation and growing of the electrodeposited platinum was investigated by means of chronoamperometric studies in acid medium. The electrodeposition on diamond surfaces shows a mechanism ofprogressive nucleation as deduced from the chronoamperometric studies in acid medium. The stability of the deposited platinum isvery low and the platinum particle are dissolved/detached by cycling. The modified BDD electrodes by deposition of platinum havebeen tested for the oxidation of methanol, showing that multi-step deposition results in higher values of surface and mass activitiesfor methanol oxidation than one-step deposition process.
机译:两种方法已用于在合成硼掺杂金刚石(BDD)表面上沉积Pt颗粒:在恒电条件下进行化学沉积和电沉积。但是,电沉积导致的铂分散度比化学沉积高得多。通过计时电流法在酸性介质中研究了电沉积铂的成核和生长机理。根据在酸性介质中的计时电流法研究推导,金刚石表面上的电沉积显示出渐进形核的机理。沉积的铂的稳定性非常低,并且铂颗粒通过循环而溶解/脱离。通过铂沉积改性的BDD电极已进行了甲醇氧化的测试,表明多步沉积比单步沉积过程具有更高的甲醇氧化表面和质量活度值。

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