Using chemically modified supports is a strategy to differentiate metal deposition, catalyst morphology and properties and, ultimately, the electrochemical activity towards the multiparametric and structure-sensitive Oxygen Reduction Reaction (ORR). Functionalized carbon nanotubes with pyridine groups, oxpyMWCNT, is a support that allows fine spatial dispersion of nanoparticles. This work reports the development of Pt supported on oxpyMWCNT with different metal loadings using the polyol method in alkaline reaction media. The effect of the pH value of the reaction solution and the reduction time on the deposition, the morphological and surface characteristics of the formed electrocatalysts was thoroughly investigated. The electrochemical performance of the aforementioned electrocatalysts towards ORR was evaluated. By using the aforementioned support, small particle size and fine and homogeneous dispersion were achieved that allowed the correlation between the properties and the electrocatalytic activity. Thus, there is a discussion about how mass and specific activity towards ORR are simultaneously affected by metal-support interactions, interparticle distance (particle proximity) and nanoparticle size.

使用化学改性载体是区分金属沉积、催化剂形态和性质以及最终对多参数和结构敏感的氧还原反应 (ORR) 的电化学活性的一种策略。具有吡啶基团的功能化碳纳米管 oxpyMWCNT 是一种支持纳米粒子的精细空间分散体。这项工作报告了在碱性反应介质中使用多元醇方法开发负载在具有不同金属负载量的 oxpyMWCNT 上的 Pt。深入研究了反应溶液的 pH 值和还原时间对沉积、形成的电催化剂的形态和表面特性的影响。评估了上述电催化剂对 ORR 的电化学性能。通过使用上述载体，实现了小粒径和精细均匀的分散，这使得性能与电催化活性之间存在相关性。因此，存在关于 ORR 的质量和比活性如何同时受到金属-载体相互作用、粒子间距离（粒子接近度）和纳米粒子大小的讨论。