3 years ago

Tuning High-Temperature Wetting Behavior of Metal toward Ultrafine Nanoparticles

Yubing Zhou, Liangbing Hu, Jeffrey W. Gilman, Hua Xie, Yonggang Yao, Qianfan Zhang, Feng Jiang, Yanchen Fan, Shaomao Xu, Chunpeng Yang, Bharath Natarajan
The interaction between the metal nanoparticles and their substrate plays a critical role in determining the particle morphology, distribution, and properties. Here we present the pronounced impact of a thin oxide coating to the dispersion of metal nanoparticles on a carbon matrix. We employ Al2O3-supported Pt nanoparticles in comparison with direct synthesis of Pt nanoparticles on bare carbon surfaces. Pt nanoparticles with an average size of ≈2 nm and a size distribution ranging between 0.5 nm and 4.0 nm are synthesized on the Al2O3 coated carbon nanofiber, significantly improved compared to those directly synthesized on bare carbon surface. First principles modeling verifies the stronger adsorption of Pt clusters on Al2O3 than on carbon, which attributes the formation of ultrafine Pt nanoparticles. Our strategy paves the way towards the rational design of nanoparticles with enhanced dispersion and controlled particle size, which are promising in energy storage and electrocatalysis.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201712202

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