Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 25, Pages 16026-16034Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b03520
Keywords
graphene; commercial sponge; 3D hierarchical structure; Pt-based electrocatalyst; fuel cells
Funding
- National Natural Science Foundation of China [21273058]
- China postdoctoral science foundation [2012M520731, 2014T70350]
- Heilongjiang postdoctoral foundation [LBH-212089]
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Three-dimensional hierarchical nitrogen-doped graphene (3D-NG) frameworks were successfully fabricated through a feasible solution dip-coating method with commercially available sponges as the initial backbone. A spongy template can help hinder the graphene plates restacking in the period of the annealing process. The Pt/3D-NG catalyst was synthesized employing a polyol reduction process. The resultant Pt/3D-NG exhibits 2.3 times higher activity for methanol electro-oxidation along with the improvement in stability as compared with Pt/G owing to their favorable features including large specific surface area, high pore volume, high N doping level, and the homogeneous dispersion of Pt nanoparticles. Besides, Pt/3D-NG also presents high oxygen reduction reaction (ORR) performance in acid media when compared with Pt/3D-G and Pt/G. This work raises a valid solution for the fabrication of 3D functional freestanding graphene-based composites for a variety of applications in fuel cell catalysis, energy storage, and conversion.
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