Instituto Universitario de Electroquímica, Universidad de Alicante, E-03690, San Vicente del Raspeig, Alicante, Spain; email:
Annu Rev Anal Chem (Palo Alto Calif). 2020 Jun 12;13(1):201-222. doi: 10.1146/annurev-anchem-061318-115541. Epub 2020 Apr 3.
The electrochemical behavior of platinum single crystal surfaces can be taken as a model response for the interpretation of the activity of heterogeneous electrodes. The cyclic voltammogram of a given platinum electrode can be considered a fingerprint characteristic of the distribution of sites on its surface. We start this review by providing some simple mathematical descriptions of the voltammetric response in the presence of adsorption processes. We then describe the voltammogram of platinum basal planes, followed by the response of stepped surfaces. The voltammogram of polycrystalline materials can be understood as a composition of the response of the different basal contributions. Further resolution in the discrimination of different surface sites can be achieved with the aid of surface modification using adatoms such as bismuth or germanium. The application of these ideas is exemplified with the consideration of real catalysts composed of platinum nanoparticles with preferential shapes.
铂单晶表面的电化学行为可用作解释非均相电极活性的模型响应。给定铂电极的循环伏安图可以被认为是其表面上位点分布的指纹特征。我们通过提供一些在吸附过程存在下的伏安响应的简单数学描述开始本综述。然后我们描述了铂基面的伏安图，接着是阶梯表面的响应。多晶材料的伏安图可以理解为不同基面贡献的响应的组合。通过使用例如铋或锗等 adatoms 进行表面修饰，可以进一步提高对不同表面位点的区分分辨率。通过考虑具有优先形状的铂纳米颗粒组成的实际催化剂，这些想法的应用得到了例证。
