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Issue 41, 2017
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Enhanced electrocatalytic performance of Pt nanoparticles on triazine-functionalized graphene nanoplatelets for both oxygen and iodine reduction reactions

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Abstract

Platinum (Pt) nanoparticles were stably anchored on triazine-functionalized graphene nanoplatelets (TfGnPs), which were prepared by a two-step reaction starting from carboxylic acid- (CGnPs), acyl chloride- (AcGnPs) and amide-functionalized graphene nanoplatelets (AfGnPs). The resulting Pt nanoparticles on TfGnPs (Pt/TfGnPs) exhibited outstanding electrocatalytic activity with significantly enhanced stability compared with commercial Pt-based catalysts for the oxygen reduction reaction (ORR) in fuel cells (FCs) and the iodine reduction reaction (IRR) in dye-sensitized solar cells (DSSCs). For the ORR in FCs, the onset and half-wave potentials of Pt/TfGnPs under acidic conditions displayed greater positive shifts to 0.58 and 0.53 V, respectively, than those of the commercial Pt/C catalyst (0.57 and 0.52 V). For the IRR in DSSCs, Pt/TfGnPs displayed a reduced charge transfer resistance (Rct) of 0.13 Ω cm2 at the CE/electrolyte interface. This value was much lower than the Pt CE of 0.52 Ω cm2. More importantly, Pt/TfGnPs exhibited profoundly improved electrochemical stability in both the ORR and IRR compared to the Pt-based catalysts. The combination of extraordinarily high electrocatalytic activity with stability could be attributed to the high specific surface area (963.0 m2 g−1) and the triazine units of the TfGnPs, respectively, which provided more active sites and stably anchored the Pt nanoparticles.

Graphical abstract: Enhanced electrocatalytic performance of Pt nanoparticles on triazine-functionalized graphene nanoplatelets for both oxygen and iodine reduction reactions

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Supplementary files

Article information


Submitted
05 Aug 2017
Accepted
22 Sep 2017
First published
22 Sep 2017

J. Mater. Chem. A, 2017,5, 21936-21946
Article type
Paper

Enhanced electrocatalytic performance of Pt nanoparticles on triazine-functionalized graphene nanoplatelets for both oxygen and iodine reduction reactions

I. Jeon, D. H. Kweon, S. Kim, S. Shin, Y. K. Im, S. Yu, M. J. Ju and J. Baek, J. Mater. Chem. A, 2017, 5, 21936
DOI: 10.1039/C7TA06912J

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