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In Situ Integration of Ultrathin PtCu Nanowires with Reduced Graphene Oxide Nanosheets for Efficient Electrocatalytic Oxygen Reduction.
Chemistry : a European Journal 2017 November 28
Ultrathin Pt-based nanowires are considered as promising electrocatalysts owing to their high atomic utilization efficiency and structural robustness. Moreover, integration of Pt-based nanowires with graphene oxide (GO) could further increase the electrocatalytic performance, yet remains challenging to date. Herein, for the first time we demonstrate the in situ synthesis of ultrathin PtCu nanowires grown over reduced GO (PtCu-NWs/rGO) by a one-pot hydrothermal approach with the aid of amine-terminated poly(N-isopropyl acrylamide) (PNIPAM-NH2 ). The judicious selection of PNIPAM-NH2 facilitates the in situ nucleation and anisotropic growth of nanowires on the rGO surface and oriented attachment mechanism accounts for the formation of PtCu ultrathin nanowires. Owing to the synergy between PtCu NWs and rGO support, the PtCu-NWs/rGO outperforms the rGO supported PtCu nanoparticles (PtCu-NPs/rGO), PtCu-NWs, and commercial Pt/C toward the oxygen reduction reaction (ORR) with higher activity and better stability, making it a promising cathodic electrocatalyst for both fuel cells and metal-air cells. Moreover, the present synthetic strategy could inspire the future design of other metal alloy nanowires/carbon hybrid catalysts.
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