Ag–Au bimetallic nanostructures: co-reduction synthesis and their component-dependent performance for enzyme-free H2O2 sensing

2013 ◽  
Vol 1 (24) ◽  
pp. 7111 ◽  
Author(s):  
Wenzheng Li ◽  
Long Kuai ◽  
Qing Qin ◽  
Baoyou Geng
Keyword(s):  
Bimetallic Nanostructures ◽  
H2o2 Sensing ◽  
Co Reduction

Seed-Mediated Co-reduction: A Versatile Route to Architecturally Controlled Bimetallic Nanostructures

ACS Nano ◽  
2012 ◽  
Vol 6 (3) ◽  
pp. 2617-2628 ◽  
Author(s):  
Christopher J. DeSantis ◽  
Aaron C. Sue ◽  
Matthew M. Bower ◽  
Sara E. Skrabalak
Keyword(s):  
Seed Mediated ◽  
Bimetallic Nanostructures ◽  
Co Reduction

High-Entropy Alloys as Catalysts for the CO2 and CO Reduction Reactions

2019 ◽  
Author(s):  
Jack Pedersen ◽  
Thomas Batchelor ◽  
Alexander Bagger ◽  
Jan Rossmeisl
Keyword(s):  
Density Functional ◽  
Rational Design ◽  
Hydrogen Adsorption ◽  
Co Adsorption ◽  
Reduction Reaction ◽  
Supervised Machine Learning ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Co Reduction ◽  
Disordered Alloy

Using the high-entropy alloys (HEAs) CoCuGaNiZn and AgAuCuPdPt as starting points we provide a framework for tuning the composition of disordered multi-metallic alloys to control the selectivity and activity of the reduction of carbon dioxide (CO2) to highly reduced compounds. By combining density functional theory (DFT) with supervised machine learning we predicted the CO and hydrogen (H) adsorption energies of all surface sites on the (111) surface of the two HEAs. This allowed an optimization for the HEA compositions with increased likelihood for sites with weak hydrogen adsorption{to suppress the formation of molecular hydrogen (H2) and with strong CO adsorption to favor the reduction of CO. This led to the discovery of several disordered alloy catalyst candidates for which selectivity towards highly reduced carbon compounds is expected, as well as insights into the rational design of disordered alloy catalysts for the CO2 and CO reduction reaction.

Polyacrylic Acid Modified Cerium Oxide Nanoparticles: Synthesis and Characterization as a Peroxidase Mimic for Non-Enzymatic H2O2 Sensor

2020 ◽  
Vol 16 (5) ◽  
pp. 816-828
Author(s):  
Gurdeep Rattu ◽  
Nishtha Khansili ◽  
Prayaga M. Krishna
Keyword(s):  
Hydrogen Peroxide ◽  
Cerium Oxide ◽  
Polyacrylic Acid ◽  
Spectroscopic Analysis ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Peroxidase Mimic ◽  
Ft Ir ◽  
H2o2 Sensing ◽  
Fluorescence Spectrometer

Background: Cerium oxide nanoparticles (nanoceria) are efficient free-radical scavengers due to their dual valence state and thus exhibit optical and catalytic properties. Therefore, the main purpose of this work was to understand the peroxidase mimic activity of polymer-stabilized nanoceria for enzyme-less H2O2 sensing by fluorescence spectrometer. Objective: This research revealed the development of fluorescence hydrogen peroxide nanosensor based on the peroxidase-like activity of polyacrylic acid stabilized nanoceria (PAA-CeO2 Nps). Methods: PAA-CeO2 Nps were synthesized by simple cross-linking reaction at a low temperature and characterized by XRD, SEM, Zeta potential, TGA, FT-IR and UV-VIS spectroscopic analysis. H2O2 sensing was performed by a fluorescence spectrometer. Results:: The synthesized polymer nanocomposite was characterized by XRD, SEM, TGA, FT-IR and UV-VIS spectroscopic analysis. The XRD diffraction patterns confirmed the polycrystalline nature and SEM micrograph showed nanoparticles having hexagonal symmetry and crystallite size of 32 nm. The broad peak of Ce–O bond appeared at 508 cm-1. UV-VIS measurements revealed a welldefined absorbance peak around 315 nm and an optical band-gap of 3.17 eV. As synthesized PAACeO2 Nps effectively catalysed the decomposition of hydrogen peroxide (H2O2) into hydroxyl radicals. Then terephthalic acid was oxidized by hydroxyl radical to form a highly fluorescent product. Under optimized conditions, the linear range for determination of hydrogen peroxide was 0.01 - 0.2 mM with a limit of detection (LOD) of 1.2 μM. Conclusion: The proposed method is ideally suited for the sensing of H2O2 at a low cost and this detection system enabled the sensing of analytes (sugars), which can enzymatically generate hydrogen peroxide.

Superior co-catalysis by bimetallic nanostructure for TiO2 photocatalysis

2020 ◽  
Vol 01 ◽  
Author(s):  
Bonamali Pal ◽  
Anila Monga ◽  
Aadil Bathla
Keyword(s):  
Visible Light ◽  
Catalytic Performance ◽  
Transition Metal Catalysts ◽  
Core Shell ◽  
Structural Morphology ◽  
Tio2 Photocatalysis ◽  
Co Catalysts ◽  
Bimetallic Nanocomposites ◽  
Bimetallic Nanostructure ◽  
Bimetallic Nanostructures

Background:: Bimetallic nanocomposites have currently gained significant importance for enhanced catalytic applications relative to monometallic analogues. The synergistic interactions modified electronic and optical properties in the bimetallic (M1@M2) structural morphology e.g., core-shell /alloy nanostructures resulted in a better co-catalytic performance for TiO2 photocatalysis. Objective:: Hence, this article discusses the preparation, characterization, and co-catalytic activity of different bimetallic nanostructures namely, Cu@Zn, Pd@Au, Au@Ag, and Ag@Cu, etc. Method:: These bimetallic co-catalysts deposited on TiO2 possess the ability to absorb visible light due to surface plasmonic absorption and are also expected to display the new properties due to synergy between two distinct metals. As a result, they reveal the highest level of activity than the monometal deposited TiO2. Result:: Their optical absorption, emission, charge carrier dynamics, and surface structural morphology are explained for the improved photocatalytic activity of M1@M2 loaded TiO2 for the hydrogenation of certain organic compounds e.g., quinoline, crotonaldehyde, and 1,3-dinitrobenzene, etc. under UV/ visible light irradiation. Conclusion:: It revealed that the use of bimetallic core@shell co-catalyst for hydrogenation of important industrial organics by M1@M2-TiO2 nanocomposite demonstrates beneficial reactivity in many instances relative to conventional transition metal catalysts.

scholarly journals Improved SERS Performance and Catalytic Activity of Dendritic Au/Ag Bimetallic Nanostructures Based on Ag Dendrites

2020 ◽  
Vol 15 (1) ◽  
Author(s):  
Zi-Qiang Cheng ◽  
Zhi-Wen Li ◽  
Rui Yao ◽  
Kuang-Wei Xiong ◽  
Guang-Ling Cheng ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Bimetallic Nanostructures

Underlying Mechanisms of Hot Carrier-Driven Reactivity on Bimetallic Nanostructures

2021 ◽  
Vol 125 (4) ◽  
pp. 2492-2501 ◽  
Author(s):  
Zhandong Li ◽  
Joel Rigor ◽  
Nicolas Large ◽  
Patrick Z. El-Khoury ◽  
Dmitry Kurouski
Keyword(s):  
Hot Carrier ◽  
Bimetallic Nanostructures ◽  
Underlying Mechanisms

A water-soluble BODIPY derivative as a highly selective “Turn-On” fluorescent sensor for H2O2 sensing in vivo

2014 ◽  
Vol 56 ◽  
pp. 58-63 ◽  
Author(s):  
Jian Xu ◽  
Qian Li ◽  
Ying Yue ◽  
Yong Guo ◽  
Shijun Shao
Keyword(s):  
Fluorescent Sensor ◽  
Water Soluble ◽  
Turn On ◽  
H2o2 Sensing

Model studies of metal catalyzed CO reduction

1980 ◽  
Vol 52 (3) ◽  
pp. 625-633 ◽  
Author(s):  
C. P. Casey ◽  
S. M. Neumann ◽  
M. A. Andrews ◽  
D. R. McAlister
Keyword(s):  
Model Studies ◽  
Metal Catalyzed ◽  
Co Reduction

Bimetallic Nanostructures as Active Raman Markers: Gold-Nanoparticle Assembly on 1D and 2D Silver Nanostructure Surfaces

Small ◽  
2009 ◽  
Vol 5 (21) ◽  
pp. 2460-2466 ◽  
Author(s):  
Ray Gunawidjaja ◽  
Eugenia Kharlampieva ◽  
Ikjun Choi ◽  
Vladimir V. Tsukruk
Keyword(s):  
Gold Nanoparticle ◽  
Nanoparticle Assembly ◽  
Silver Nanostructure ◽  
Bimetallic Nanostructures
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