Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 48, Pages 41608-41617Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b11774
Keywords
Pt nanocrystals; shape; citrate-coated; formic acid electrooxidation; octahedral; green synthesis
Funding
- MINECO [CTQ2016-76221-P, CTQ2016-76231-C2-2-R]
- VITC (Vicerrectorado de Investigacion y Transferencia de Conocimiento) of the University of Alicante [UATALENTO16-02]
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The development of green and scalable syntheses for the preparation of size-and shape-controlled metal nanocrystals is of high interest in many areas, including catalysis, electrocatalysis, nanomedicine, and electronics. In this work, a new synthetic approach based on the synergistic action of physical parameters and reagents produces size tunable octahedral Pt nanocrystals, without the use of catalyst-poisoning reagents and/or difficult-to-remove coatings. The, synthesis requires sodium citrate, ascorbic acid, and fine control of the reduction rate in aqueous environment. Pt octahedral nanocrystals with particle size as low as 7 nm and highly developed {111} facets have been achieved, as demonstrated by transmission electron microscopy, X-ray diffraction, and electrochemical methods. The absence of sticky molecules together with the high quality of the surface makes these nanocrystals ideal candidates in electrocatalysis. Notably, 7 nm bismuth-decorated octahedral nanocrystals exhibit superior performance for the electrooxidation of formic acid in terms of both specific and mass activities.
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