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Title: High-Yield Synthesis of Sub-10 nm Pt Nanotetrahedra with Bare < 111 > Facets for Efficient Electrocatalytic Applications
Authors: Rana, Moumita
Chhetri, Manjeet
Loukya, B.
Patil, Pramod K.
Datta, Ranjan
Gautam, Ujjal K.
Keywords: Nanoscience & Nanotechnology
Materials Science
metal nanocrystals
oxygen reduction reaction
fuel cell
methanol oxidation
Oxygen Reduction Reaction
Shape-Controlled Synthesis
High-Index Facets
Platinum Nanocrystals
Heterogeneous Catalysts
Assisted Synthesis
Issue Date: 2015
Publisher: American Chemical Society
Citation: ACS Applied Materials & Interfaces
Rana, M.; Chhetri, M.; Loukya, B.; Patil, P. K.; Datta, R.; Gautam, U. K., High-Yield Synthesis of Sub-10 nm Pt Nanotetrahedra with Bare < 111 > Facets for Efficient Electrocatalytic Applications. ACS Applied Materials & Interfaces 2015, 7 (8), 4998-5005.
Abstract: Unlike other shapes, the design of tetrahedral Pt nanocrystals (Pt-NTd), which have the largest number of Pt(111) surface atoms and highest catalytic activities toward the electron transfer reactions, has widely been considered a synthetic challenge due to their thermodynamic instability. Here, we show that, by inducing their nucleation on functionalized carbon, Pt NTds can be obtained with tunable sizes and high yields. The carbon support anchors the nanocrystals early and prevents their oriented attachment leading to nanowire formation. Therein, an in situ generated amine is crucial for stabilization of Pt-NTds, which can later be removed to expose the Pt(111) facets for higher catalytic efficiency. The bare nanocrystals exhibit much improved stability and electrocatalytic activity characteristic of Pt(111) toward oxygen reduction reaction (ORR) and methanol and formic acid oxidation reactions. For example, similar to 90% of their activity was retained after 5000 potential cycles, while the ORR onset potential was recorded to be very high, 1.01 V vs reversible hydrogen electrode (RHE).
Description: Restricted access
ISSN: 1944-8244
Appears in Collections:Research Articles (Ranjan Datta)

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