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Shape transformation of gold nanoparticles in aqueous CTAB/CTAC solution to generate high-index facets for electrocatalysis and SERS activity

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ChemPhysMater 2023年第2期2卷 97-113页

作者： Yahui Song Mengmeng Zhang Hetong Fang Haibing Xia State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China Academy of Advanced Interdisciplinary Studies Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China

Gold nanoparticles(Au NPs)have demonstrated great potential in chemical and biological sensing,catalysis,biomedicine,X-ray computed tomography,and other applications,owing to their unique properties.Au NPs with high-index facets have attracted more attention in the past decade owing to their superior electrocatalytic activity in fuel cells and enhanced performance in surface-enhanced Raman spectroscopy(SERS)applications.This review presents an overview of our achievements in the direct synthesis of Au NPs with controlled shapes in water using cationic surfactants.By deliberately adjusting the nature of the surfactant stabilizers,preformed Au NPs with simple shapes can be readily transformed into Au NPs with complicated shapes with controlled high-index facets by simple seeded growth.The high-index facets of the as-prepared Au NPs can be consistently correlated with their superior performance in the electrooxidation of methanol and ethanol and their enhanced SERS activity.

关键词： Gold Nanoparticles high-index Electrocatalysis SERS

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highly active zigzag-like Pt-Zn alloy nanowires with high-index facets for alcohol electrooxidation

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Nano Research 2019年第5期12卷 1173-1179页

作者： Yanchao Xu Xiaoqiang Cui Shuting Wei Qinghua Zhang Lin Gu Fanqi Meng Jinchang Fan Weitao Zheng State Key Laboratory of Automotive Simulation and Control School of Materials Science and EngineeringKey Laboratory of Automobile Materials of MOE and Jilin UniversityChangchun 130012China Laboratory of Advanced Materials and Electron Microscopy Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China

The development of highly efficient Pt-based alloy nanocatalysts is important but remains challenging for fuel cells commercialization.Here,a new class of zigzag-like platinum-zinc (Pt-Zn) alloy nanowires (NWs) with rough surface and controllable composition is reported.The merits of anisotropic one-dimensional nanostructure,stable high-index facets and coordinatively unsaturated Pt sites endow the composition-optimal Pt94Zn6 NWs with a mass activity of 7.2 and 6.2 times higher than that of commercial Pt black catalysts toward methanol/ethanol oxidation,respectively.Alloying-induced d-band electron modulation and lattice strain effects weaken the adsorption strength of poisoning species,which originally enhances the catalytic activity of Pt-Zn NWs.This study provides a new perspective of Pt-Zn electrocatalysts with intrinsic mechanism for enhanced catalytic performance.

关键词： Pt-Zn nanowires zigzag-like high-index facets d-band center strain effects alcohol oxidation

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Exposed facet-controlled N2 electroreduction on distinct Pt3Fe nanostructures of nanocubes, nanorods and nanowires

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National Science Review 2021年第1期8卷 117-126页

作者： Wu Tong Bolong Huang Pengtang Wang Qi Shao Xiaoqing Huang College of Chemistry Chemical Engineering and Materials Science Soochow University Department of Applied Biology and Chemical Technology Hong Kong Polytechnic University

Understanding the correlation between exposed surfaces and performances of controlled nanocatalysts can aid effective strategies to enhance electrocatalysis, but this is as yet unexplored for the nitrogen reduction reaction (NRR). Here, we first report controlled synthesis of well-defined PtFe nanocrystals with tunable morphologies (nanocube, nanorod and nanowire) as ideal model electrocatalysts for investigating the NRR on different exposed facets. The detailed electrocatalytic studies reveal that the PtFe nanocrystals exhibit shape-dependent NRR electrocatalysis. The optimized PtFe nanowires bounded with high-index facets exhibit excellent selectivity (no N2H4 is detected), high activity with NHyield of 18.3μg hmgcat(0.52μg hcmECSA; ECSA:electrochemical active surface area) and Faraday efficiency of 7.3%at-0.05 V versus reversible hydrogen electrode, outperforming the{200}facet-enclosed PtFe nanocubes and{111}facet-enclosed PtFe nanorods. They also show good stability with negligible activity change after five cycles. Density functional theory calculations reveal that, with high-indexed facet engineering, the Fe-3d band is an efficient d-d coupling correlation center for boosting the Pt 5d-electronic exchange and transfer activities towards the NRR.

关键词： Pt_3Fe nanowire high-index facet-controlled N2 reduction

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