The Experts below are selected from a list of 10227 Experts worldwide ranked by ideXlab platform
Arkady A. Karyakin - One of the best experts on this subject based on the ideXlab platform.
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catalytically synthesized Prussian Blue nanoparticles defeating natural enzyme peroxidase
2018Co-Authors: Maria A Komkova, Elena E Karyakina, Arkady A. KaryakinAbstract:We synthesized Prussian Blue (PB) nanoparticles through catalytic reaction involving hydrogen peroxide (H2O2) activation. The resulting nanoparticles display the size-dependent catalytic rate constants in H2O2 reduction, which are significantly improved compared to natural enzyme peroxidase: for PB nanoparticles 200 nm in diameter, the turnover number is 300 times higher; for 570 nm diameter nanoparticles, it is 4 orders of magnitude higher. Comparing to the known peroxidase-like nanozymes, the advantages of the reported PB nanoparticles are their true enzymatic properties: (1) enzymatic specificity (an absence of oxidase-like activity) and (2) an ability to operate in physiological solutions. The ultrahigh activity and enzymatic specificity of the catalytically synthesized PB nanoparticles together with high stability and low cost, obviously peculiar to noble metal free inorganic materials, would allow the substitution of natural and recombinant peroxidases in biotechnology and analytical sciences.
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transition metal hexacyanoferrates in electrocatalysis of h2o2 reduction an exclusive property of Prussian Blue
2014Co-Authors: Natalya A Sitnikova, Elena E Karyakina, Maria A Komkova, Irina V Khomyakova, Arkady A. KaryakinAbstract:The ability of Prussian Blue, ferric hexacyanoferrate (FeHCF), to sensitively and selectively detect hydrogen peroxide by its reduction in the presence of oxygen is of high importance for analytical chemistry. Success with Prussian Blue (PB) provided an appearance of contradictory reports concerning electrocatalysis of the other transition metal hexacyanoferrates (HCFs) in H2O2 reduction. Investigating thermodynamics of the catalyzed reactions as well as electrochemical properties of the hexacyanoferrates, we are able to conclude that the noniron hexacyanoferrates themselves are completely electrocatalytically inactive, except for a minor electrocatalysis in the opposite reaction, hydrogen peroxide oxidation, registered for NiHCF. Concerning the most important reaction, H2O2 reduction, the observed electrocatalytic activity (by the way, 100 times decreased compared to PB) is due to the presence of FeHCF (Prussian Blue) as defects in the structure of noniron hexacyanoferrates. This finding, considering oth...
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Prussian Blue based nanoelectrode arrays for h2o2 detection
2004Co-Authors: Arkady A. Karyakin, Elena E Karyakina, Elena A Puganova, I A Budashov, I N Kurochkin, V A Levchenko, Vladimir N Matveyenko, Sergey D VarfolomeyevAbstract:We propose to form nanoelectrode arrays by deposition of the electrocatalyst through lyotropic liquid crystalline templates onto inert electrode support. Whereas Prussian Blue is known to be a superior electrocatalyst in hydrogen peroxide reduction, carbon materials used as electrode support demonstrate only a minor activity. We report on the possibility for nanostructuring of Prussian Blue by its electrochemical deposition through lyotropic liquid crystalline templates, which is noticed from atomic force microscopy images of the resulting surfaces. The resulting Prussian Blue based nanoelectrode arrays in flow injection analysis mode demonstrate a sub-part-per-billion detection limit (1 × 10-8 M) and a linear calibration range starting exactly from the detection limit and extending over 6 orders of magnitude of H2O2 concentrations (1 × 10-8 to 1 × 10-2 M), which are the most advantageous analytical performances in hydrogen peroxide electroanalysis.
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Prussian Blue and its analogues: Electrochemistry and analytical applications
2001Co-Authors: Arkady A. KaryakinAbstract:This article reviews fundamental aspects of deposition, structure and electrochemistry of Prussian Blue and its analogues. Special attention is given to the metal hexacyanoferrates with potential analytical applications. Prussian Blue and its analogues as advanced sensing materials for nonelectroactive ions are discussed. In contrast to common ‘smart materials’, the sensitivity and selectivity of metal hexacyanoferrates to such ions is provided by thermodynamic background. Prussian Blue itself is recognized as the most advantageous low-potential transducer for hydrogen peroxide over all known systems. Both high sensitivity (ca. 1 A M−1 cm−2) and selectivity in relation to oxygen reduction are more than three orders of magnitude higher, than for platinum electrodes. Biosensors based on different transducing principles containing enzymes oxidases are compared, and the devices operated due to hydrogen peroxide detection with the Prussian Blue based transducer are shown to be the most advantageous ones. The future prospects of chemical and biological sensors based on metal hexacyanoferrates are outlined.
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amperometric biosensor for glutamate using Prussian Blue based artificial peroxidase as a transducer for hydrogen peroxide
2000Co-Authors: Arkady A. Karyakin, Elena E Karyakina, Lo GortonAbstract:The specially deposited Prussian Blue denoted as “artificial peroxidase” was used as a transducer for hydrogen peroxide. The electrocatalyst was stable, highly active, and selective to hydrogen peroxide reduction in the presence of oxygen, which allowed sensing of H2O2 around 0.0 V (Ag/AgCl). Glutamate oxidase was immobilized on the surface of the Prussian Blue-modified electrode in a Nafion layer using a nonaqueous enzymology approach. The calibration range for glutamate in flow injection system was 1 × 10-7−1 × 10-4 M. The lowest concentration of glutamate detected (1 × 10-7 M) and the highest sensitivity in the linear range of 0.21 A M-1 cm-2 were achieved. The influence of reductants was practically avoided using the low potential of an indicator electrode (0.0 V Ag/AgCl). The attractive performance characteristics of the glutamate biosensor illustrate the advantages of Prussian Blue-based “artificial peroxidase” as transducer for hydrogen peroxide detection.
Elena E Karyakina - One of the best experts on this subject based on the ideXlab platform.
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catalytically synthesized Prussian Blue nanoparticles defeating natural enzyme peroxidase
2018Co-Authors: Maria A Komkova, Elena E Karyakina, Arkady A. KaryakinAbstract:We synthesized Prussian Blue (PB) nanoparticles through catalytic reaction involving hydrogen peroxide (H2O2) activation. The resulting nanoparticles display the size-dependent catalytic rate constants in H2O2 reduction, which are significantly improved compared to natural enzyme peroxidase: for PB nanoparticles 200 nm in diameter, the turnover number is 300 times higher; for 570 nm diameter nanoparticles, it is 4 orders of magnitude higher. Comparing to the known peroxidase-like nanozymes, the advantages of the reported PB nanoparticles are their true enzymatic properties: (1) enzymatic specificity (an absence of oxidase-like activity) and (2) an ability to operate in physiological solutions. The ultrahigh activity and enzymatic specificity of the catalytically synthesized PB nanoparticles together with high stability and low cost, obviously peculiar to noble metal free inorganic materials, would allow the substitution of natural and recombinant peroxidases in biotechnology and analytical sciences.
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transition metal hexacyanoferrates in electrocatalysis of h2o2 reduction an exclusive property of Prussian Blue
2014Co-Authors: Natalya A Sitnikova, Elena E Karyakina, Maria A Komkova, Irina V Khomyakova, Arkady A. KaryakinAbstract:The ability of Prussian Blue, ferric hexacyanoferrate (FeHCF), to sensitively and selectively detect hydrogen peroxide by its reduction in the presence of oxygen is of high importance for analytical chemistry. Success with Prussian Blue (PB) provided an appearance of contradictory reports concerning electrocatalysis of the other transition metal hexacyanoferrates (HCFs) in H2O2 reduction. Investigating thermodynamics of the catalyzed reactions as well as electrochemical properties of the hexacyanoferrates, we are able to conclude that the noniron hexacyanoferrates themselves are completely electrocatalytically inactive, except for a minor electrocatalysis in the opposite reaction, hydrogen peroxide oxidation, registered for NiHCF. Concerning the most important reaction, H2O2 reduction, the observed electrocatalytic activity (by the way, 100 times decreased compared to PB) is due to the presence of FeHCF (Prussian Blue) as defects in the structure of noniron hexacyanoferrates. This finding, considering oth...
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Prussian Blue based nanoelectrode arrays for h2o2 detection
2004Co-Authors: Arkady A. Karyakin, Elena E Karyakina, Elena A Puganova, I A Budashov, I N Kurochkin, V A Levchenko, Vladimir N Matveyenko, Sergey D VarfolomeyevAbstract:We propose to form nanoelectrode arrays by deposition of the electrocatalyst through lyotropic liquid crystalline templates onto inert electrode support. Whereas Prussian Blue is known to be a superior electrocatalyst in hydrogen peroxide reduction, carbon materials used as electrode support demonstrate only a minor activity. We report on the possibility for nanostructuring of Prussian Blue by its electrochemical deposition through lyotropic liquid crystalline templates, which is noticed from atomic force microscopy images of the resulting surfaces. The resulting Prussian Blue based nanoelectrode arrays in flow injection analysis mode demonstrate a sub-part-per-billion detection limit (1 × 10-8 M) and a linear calibration range starting exactly from the detection limit and extending over 6 orders of magnitude of H2O2 concentrations (1 × 10-8 to 1 × 10-2 M), which are the most advantageous analytical performances in hydrogen peroxide electroanalysis.
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amperometric biosensor for glutamate using Prussian Blue based artificial peroxidase as a transducer for hydrogen peroxide
2000Co-Authors: Arkady A. Karyakin, Elena E Karyakina, Lo GortonAbstract:The specially deposited Prussian Blue denoted as “artificial peroxidase” was used as a transducer for hydrogen peroxide. The electrocatalyst was stable, highly active, and selective to hydrogen peroxide reduction in the presence of oxygen, which allowed sensing of H2O2 around 0.0 V (Ag/AgCl). Glutamate oxidase was immobilized on the surface of the Prussian Blue-modified electrode in a Nafion layer using a nonaqueous enzymology approach. The calibration range for glutamate in flow injection system was 1 × 10-7−1 × 10-4 M. The lowest concentration of glutamate detected (1 × 10-7 M) and the highest sensitivity in the linear range of 0.21 A M-1 cm-2 were achieved. The influence of reductants was practically avoided using the low potential of an indicator electrode (0.0 V Ag/AgCl). The attractive performance characteristics of the glutamate biosensor illustrate the advantages of Prussian Blue-based “artificial peroxidase” as transducer for hydrogen peroxide detection.
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the electrocatalytic activity of Prussian Blue in hydrogen peroxide reduction studied using a wall jet electrode with continuous flow
1998Co-Authors: Arkady A. Karyakin, Elena E KaryakinaAbstract:Abstract The kinetics of hydrogen peroxide reduction on electrodes modified with specially deposited Prussian Blue were investigated using a wall-jet cell with continuous flow. For this aim a new semi-empirical model for the diffusion limited current distribution holding for narrow wall-jet electrodes was described. In spite of the non-uniform accessibility of the wall-jet electrode surface in terms of mass transport the evaluated equation for the total current density ( j ) allowed the separation of the diffusion and kinetic terms of the current through investigating the dependence of j on the volume flow rate ( V ) in (1/ j vs V − 3/4 ) plots. The theoretical conclusions presented were confirmed by kinetic investigations of the electrocatalytic reduction of H 2 O 2 at glassy carbon wall-jet electrodes modified with Prussian Blue. The bimolecular rate constant for the reduction of H 2 O 2 on the specially deposited Prussian Blue was found to be k cat =3×10 3 M −1 s −1 . Due to the characteristics of the high catalytic activity and selectivity, which were comparable with biocatalysis using peroxidase, the Prussian Blue based electrocatalyst is denoted as ‘artificial peroxidase’.
Sheng Dai - One of the best experts on this subject based on the ideXlab platform.
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mesoporous Prussian Blue analogues template free synthesis and sodium ion battery applications
2014Co-Authors: Yanfeng Yue, Bingkun Guo, Andrew J Binder, Zhiyong Zhang, Zhenan Qiao, Chengcheng Tian, Sheng DaiAbstract:Mesoporous Prussian Blue Ni analogues as high-performance electrode materials in Na-ion batteries are prepared through a template-free, environmentally friendly, and low-cost method.
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mesoporous Prussian Blue analogues template free synthesis and sodium ion battery applications
2014Co-Authors: Yanfeng Yue, Bingkun Guo, Sheng Dai, Andrew J Binder, Zhiyong Zhang, Zhenan Qiao, Chengcheng TianAbstract:The synthesis of mesoporous Prussian Blue analogues through a template-free methodology and the application of these mesoporous materials as high-performance cathode materials in sodium-ion batteries is presented. Crystalline mesostructures were produced through a synergistically coupled nanocrystal formation and aggregation mechanism. As cathodes for sodium-ion batteries, the Prussian Blue analogues all show a reversible capacity of 65 mA h g−1 at low current rate and show excellent cycle stability. The reported method stands as an environmentally friendly and low-cost alternative to hard or soft templating for the fabrication of mesoporous materials.
Mohamed Zakaria - One of the best experts on this subject based on the ideXlab platform.
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recent advances in Prussian Blue and Prussian Blue analogues synthesis and thermal treatments
2017Co-Authors: Mohamed Zakaria, Toyohiro ChikyowAbstract:Abstract Coordination polymers (CPs) have gained a great deal of attention over the years because of their beneficial uses in catalysis, drug-delivery, and energy storage and separation. Recent research efforts have been devoted to architecting CPs that satisfy the needs of applications that have recently been developed. Herein, we announce a survey of the latest developments in the synthesis of Prussian Blue (PB) and Prussian Blue analogues (PBAs) cyano-bridged CPs. The recent synthetic concepts and the modest control over the shape and size of particles are demonstrated to the present. Various ways have been taken to construct nanostructured inorganic materials from PB and PBAs. We surveyed one such example: the thermal decomposition of these materials in different environments. The regulated thermal treatment of their nanostructures as precursors, in air or inert atmosphere, yields nanoporous metal oxides and carbides or alloys, respectively. The resulting metal frameworks participate as metal sources, and the organic components, which can be removed by a simple process of calcination, produce pores. The original morphologies are almost retained, even after the thermal treatments. This strategy has proved to be a promising solid-state chemistry for the fabrication of nanoporous metal oxides and carbides or alloys with the similar morphology.
Siew Hwa Chan - One of the best experts on this subject based on the ideXlab platform.
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a membraneless hydrogen peroxide fuel cell using Prussian Blue as cathode material
2012Co-Authors: Seyed Ali Mousavi Shaegh, Namtrung Nguyen, Seyyed Mohsen Mousavi Ehteshami, Siew Hwa ChanAbstract:This communication describes the exploitation of Prussian Blue, ferric ferrocyanide (Fe4III[FeII(CN)6]3), for the cathode side in a single-chamber membraneless fuel cell running on hydrogen peroxide (H2O2) as both fuel and oxidant. An open-circuit voltage (OCV) of 0.6 V has been obtained, which could be the highest OCV with H2O2 ever reported. The maximum power density was 1.55 mW cm−2 which showed a stable long-term operation in acidic media.
