Nanocollision electrochemistry is employed to evaluate the ORR's activity of one single Pt nanoparticle, the effect of the size and ligand is investigated. The size-normalized activity of the Pt nanoparticle of 4 nm is two times higher than that of 25 nm, confirming that the intrinsic activity does depend on the size of the nanoparticles. It is further found that the adsorbed ligand does yield effect on electrocatalysis, and the adsorption strength follows the order of PVP > CTAB > citrate. This work is of significance to understand the nature of the ORR's electrocatalysis at the level of an individual entity, which makes the structure-activity correlation in a more reliable way.

纳米碰撞电化学用于评估单个Pt纳米粒子的ORR活性，研究了尺寸和配体的影响。4 nm的Pt纳米颗粒的尺寸归一化活性是25 nm的尺寸归一化活性的两倍，这证实了固有活性确实取决于纳米颗粒的尺寸。进一步发现吸附的配体确实对电催化产生影响，吸附强度遵循PVP> CTAB>柠檬酸盐的顺序。这项工作对于了解单个实体水平上ORR的电催化性质具有重要意义，这使结构活性之间的关联更可靠。