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Extending the limits of Pt/C catalysts with passivation-gas-incorporated atomic layer deposition
Nature Catalysis ( IF 37.8 ) Pub Date : 2018-07-30 , DOI: 10.1038/s41929-018-0118-1
Shicheng Xu , Yongmin Kim , Joonsuk Park , Drew Higgins , Shih-Jia Shen , Peter Schindler , Dickson Thian , J. Provine , Jan Torgersen , Tanja Graf , Thomas D. Schladt , Marat Orazov , Bernard Haochih Liu , Thomas F. Jaramillo , Fritz B. Prinz

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.



中文翻译:

钝化气体结合原子层沉积扩展了Pt / C催化剂的极限

前体-底物和前体-沉积物相互作用强烈地影响了在表面沉积过程中控制贵金属纳米颗粒的形貌。沉积物可通过多种手段来改善,包括调整基材的表面能以改善前体的可湿性,或通过改变沉积物本身的表面能。在这里,我们表明一氧化碳可以在原子层沉积过程中用作钝化气体,以改变已经沉积的Pt纳米颗粒的表面能,以帮助直接沉积到碳催化剂载体上。钝化过程促进二维生长,从而导致Pt纳米粒子的厚度受到抑制,并且Pt的表面体积比提高了40%以上。

更新日期:2018-07-31
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