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Coassembly and high ORR performance of monodisperse Pt nanocrystals with a mesopore-rich nitrogen-doped graphene aerogel

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Abstract

Solving the problems of the decrease of exposed active surfaces of Pt nanoparticles due to aggregation and their non-uniform dispersion is key to yielding high catalytic activity. In this work, monodisperse Pt nanocrystals (PtNCs) with a small size (2.8 nm in average diameter) and large exposed active surfaces are obtained by designing, inducing and dispersing the PtNCs on a 3D mesopore-rich nitrogen-doped graphene aerogel (NGA) through a facile one-step coassembly. Such a coassembly of PtNCs with NGA (PtNCs@NGA) has a large specific surface area (1750 m2 gāˆ’1), rich mesopores (the ratio of mesopores of 2ā€“5 nm to all mesopores is 78%), and a high N content (3.93 at%). The unique structure of PtNCs@NGA not only ensures the exposure of the active PtNCs to O2 and decreases the diffusion time of O2 inside the pore channels, but also increases the adsorption and diffusion of O2 in PtNCs@NGA, consequently increasing the oxygen reduction reaction (ORR) speed and yielding better electrocatalytic activity than those of so far reported metal catalysts on carbon materials. The simple and low-cost preparation of the PtNCs@NGA catalyst renders it the most promising among electrocatalysts for application in fuel cells.

Graphical abstract: Coassembly and high ORR performance of monodisperse Pt nanocrystals with a mesopore-rich nitrogen-doped graphene aerogel

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Publication details

The article was received on 16 May 2017, accepted on 24 Jul 2017 and first published on 25 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA04255H
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Coassembly and high ORR performance of monodisperse Pt nanocrystals with a mesopore-rich nitrogen-doped graphene aerogel

    B. Xie, Y. Zhang and R. Zhang, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA04255H

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