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AuPt Bipyramid Nanoframes as Multifunctional Platforms for In Situ Monitoring of the Reduction of Nitrobenzene and Enhanced Electrocatalytic Methanol Oxidation
Author(s) -
Fang Caihong,
Zhao Guili,
Zhang Zijun,
Ding Qian,
Yu Nan,
Cui Zhiqing,
Bi Ting
Publication year - 2019
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201900403
Subject(s) - catalysis , nitrobenzene , alloy , methanol , materials science , bipyramid , nanostructure , nanoclusters , nanotechnology , metal , nanoparticle , chemical engineering , chemistry , metallurgy , organic chemistry , molecule , engineering
Multifunctional metal nanostructures with a hollow feature, especially for nanoframes, are highly attractive owing to their high surface‐to‐volume ratios. However, pre‐grown metal nanocrystals are always involved during the preparation procedure, and a synthetic strategy without the use of a pre‐grown template is still a challenge. In this article, a template‐free strategy is reported for the preparation of novel AuPt alloy nanoframes through simply mixing HAuCl 4 and H 2 PtCl 6 under mild conditions. The alloy nanostructures show a bipyramid‐frame hollow architecture with the existence of only the ten ridges and absence of their side faces. This is the first report of bipyramid‐like nanoframes and a template‐free method under mild conditions. This configuration merges the plasmonic features of Au and highly active catalytic sites of Pt in a single nanostructure, making it an ideal multifunctional platform for catalyzing and monitoring the catalytic reaction in real time. The superior catalytic activity is demonstrated by using the reduction of nitrobenzene to the corresponding aminobenzene as a model reaction. More importantly, the AuPt nanoframes can track the reduction process on the basis of the SERS signals of the reactants, intermediates, and products, which helps to reveal the reaction mechanism. In addition, the AuPt nanoframes show much higher electrocatalytic properties toward the methanol oxidation reaction than commercial Pt/C electrocatalysts.