Latsuzbaia R, Negro E, Koper G J M
Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL Delft (Netherlands).
ChemSusChem. 2015 Jun 8;8(11):1926-34. doi: 10.1002/cssc.201500019. Epub 2015 May 8.
The dissolution of noble-metal catalysts under mild and carbon-preserving conditions offers the possibility of in situ regeneration of the catalyst nanoparticles in fuel cells or other applications. Here, we report on the complete dissolution of the fuel cell catalyst, platinum nanoparticles, under very mild conditions at room temperature in 0.1 M HClO4 and 0.1 M HCl by electrochemical potential cycling between 0.5-1.1 V at a scan rate of 50 mV s(-1) . Dissolution rates as high as 22.5 μg cm(-2) per cycle were achieved, which ensured a relatively short dissolution timescale of 3-5 h for a Pt loading of 0.35 mg cm(-2) on carbon. The influence of chloride ions and oxygen in the electrolyte on the dissolution was investigated, and a dissolution mechanism is proposed on the basis of the experimental observations and available literature results. During the dissolution process, the corrosion of the carbon support was minimal, as observed by X-ray photoelectron spectroscopy (XPS).
在温和且保碳的条件下使贵金属催化剂溶解，为燃料电池或其他应用中催化剂纳米颗粒的原位再生提供了可能。在此，我们报告了在室温下于0.1 M高氯酸和0.1 M盐酸中，通过在0.5 - 1.1 V之间以50 mV s⁻¹的扫描速率进行电化学电位循环，燃料电池催化剂铂纳米颗粒在非常温和的条件下完全溶解的情况。实现了高达每循环22.5 μg cm⁻²的溶解速率，这确保了对于在碳上负载量为0.35 mg cm⁻²的铂，溶解时间尺度相对较短，为3 - 5小时。研究了电解质中氯离子和氧气对溶解的影响，并基于实验观察结果和现有文献结果提出了一种溶解机制。在溶解过程中，通过X射线光电子能谱（XPS）观察到碳载体的腐蚀极小。
