Analytische Chemie-Elektroanalytik & Sensorik, Ruhr-University Bochum, D-44780 Bochum, Germany.
Anal Chem. 2010 Mar 1;82(5):1890-6. doi: 10.1021/ac902620g.
Pt-Ag nanoparticles were prepared on a glassy carbon (GC) surface by pulsed electrodeposition and tested using cyclic voltammetry and scanning electrochemical microscopy (SECM) with respect to their possible use as catalyst material for oxygen reduction in 400 mM HCl solution. For comparison, a Pt catalyst was investigated under similar conditions. The redox competition mode of scanning electrochemical microscopy (RC-SECM) was adapted to the specific conditions caused by the presence of Cl(-) ions and used to visualize the local catalytic activity of the Pt-Ag deposits. Similarly prepared Pt deposits were shown to dissolve underneath the SECM tip. Pt-Ag composites showed improved long-term stability toward oxygen reduction as compared with Pt even under multiple switching off to open-circuit potential in 400 mM HCl.
Pt-Ag 纳米颗粒通过脉冲电沉积在玻璃碳 (GC) 表面上制备，并通过循环伏安法和扫描电化学显微镜 (SECM) 进行测试，以评估其在 400mM HCl 溶液中作为氧还原催化剂材料的可能性。为了进行比较，在类似条件下研究了 Pt 催化剂。扫描电化学显微镜的氧化还原竞争模式 (RC-SECM) 适用于由 Cl(-) 离子存在引起的特定条件，并用于可视化 Pt-Ag 沉积物的局部催化活性。同样制备的 Pt 沉积物在 SECM 尖端下显示出溶解。与 Pt 相比，即使在 400mM HCl 中多次切换到开路电位，Pt-Ag 复合材料在氧还原方面也显示出更好的长期稳定性。
