Platinum particles deposited on synthetic boron-doped diamond surfaces.: Application to methanol oxidation
Platinum particles deposited on synthetic boron-doped diamond surfaces.: Application to methanol oxidation
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DOI：
10.1016/s0013-4686(03)00526-7
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发表时间：
2003-11-15
影响因子：
6.6
通讯作者：
Vázquez, JL
中科院分区：
文献类型：
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作者：
Montilla, F;Morallón, E;Vázquez, JL
在合成掺硼金刚石（BDD）表面沉积Pt粒子有两种方法：化学沉积和恒电位条件下的电沉积。然而，与化学沉积相比，电沉积导致铂的分散性更高。采用时间电流法研究了电沉积铂在酸性介质中成核和生长的机理。在酸性介质中，电沉积在金刚石表面表现出渐进成核的机制。沉积的铂的稳定性很低，铂颗粒通过循环溶解/分离。通过沉积铂修饰的BDD电极对甲醇的氧化进行了测试，结果表明，与一步沉积相比，多步骤沉积的甲醇氧化表面活性和质量活性值更高。(C) 2003 Elsevier Ltd.版权所有。
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 of progressive nucleation as deduced from the chronoamperometric studies in acid medium. The stability of the deposited platinum is very low and the platinum particle are dissolved/detached by cycling. The modified BDD electrodes by deposition of platinum have been tested for the oxidation of methanol, showing that multi-step deposition results in higher values of surface and mass activities for methanol oxidation than one-step deposition process. (C) 2003 Elsevier Ltd. All rights reserved.