Platinum–rhodium nanoparticles modified with cesium salt of phosphotungstic acid, CsPTA, have been tested for electro-oxidation of 2-propanol in acidic medium. The resulting Pt-based nanoparticle-containing materials have been carried out using X-ray diffraction (XRD), microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and different electrochemical techniques combining with differential electrochemical mass spectrometry (DEMS). The experimental results such as cyclic voltammetry and chronoamperometry exhibit that films on carbon electrodes composed of CsPTA-modified PtRh/Vulcan nanoparticles improve the catalytic activity, in terms of potential and current densities recorded during electro-oxidation of 2-propanol, relative to the CsPTA-free PtRh/Vulcan nanoparticles. Particularly, the boost in the catalytic current densities is observed at low potential value (below 0.25 V vs. RHE). The differential electrochemical mass spectrometry measurements were utilized to recognize the reaction intermediates as well as products created during the electro-oxidation of 2-propanol. The results indicate that contributions from a straightforward oxidation of 2-propanol to CO₂ are small in comparison to acetone yield.

Graphical Abstract

经磷钨酸铯盐CsPTA修饰的铂铑铑纳米粒子已在酸性介质中进行了2-丙醇的电氧化测试。已经使用X射线衍射（XRD），显微镜（TEM），X射线光电子能谱（XPS）和不同的电化学技术结合差示电化学质谱法（DEMS）来进行所得的含Pt基纳米颗粒的材料。循环伏安法和计时电流法等实验结果表明，相对于CsPTA，由CsPTA修饰的PtRh / Vulcan纳米颗粒组成的碳电极上的膜在2-丙醇电氧化过程中记录的电势和电流密度方面提高了催化活性。无PtRh / Vulcan纳米颗粒。尤其，在低电位值下（低于0.25 V vs. RHE）观察到催化电流密度的提高。差示电化学质谱法测量用于识别反应中间体以及在2-丙醇的电氧化过程中产生的产物。结果表明，2-丙醇直接氧化为CO的贡献与丙酮的收率相比，图₂的收率小。

图形概要