Extending the limits of Pt/C catalysts with passivation-gas-incorporated atomic layer deposition
Xu, Shicheng; Kim, Yongmin; Park, Joonsuk; Higgins, Drew; Shen, Shih-Jia; Thian, Dickson; Provine, John; Torgersen, Jan; Graf, Tanja; Schladt, Thomas; Orazov, Marat; Liu, Bernard Haochih; Prinz, Fritz
Abstract
Controlling the morphology of noble metal nanoparticles during surface depositions is strongly influenced by precursor–substrate and precursor–deposit interactions. Depositions can be improved through a variety of means, including tailoring the surface energy of a substrate to improve precursor wettability, or by modifying the surface energy of the deposits themselves. Here, we show that carbon monoxide can be used as a passivation gas during atomic layer deposition to modify the surface energy of already deposited Pt nanoparticles to assist direct deposition onto a carbon catalyst support. The passivation process promotes two-dimensional growth leading to Pt nanoparticles with suppressed thicknesses and a more than 40% improvement in Pt surface-to-volume ratio. This approach to synthesizing nanoparticulate Pt/C catalysts achieved high Pt mass activities for the oxygen reduction reaction, along with excellent stability likely facilitated by strong catalyst–support interactions afforded by this synthetic technique.