Quantifying the Electrocatalytic Turnover of Vitamin B<sub>12</sub>‐Mediated Dehalogenation on Single Soft Nanoparticles

Cheng, Wei; Compton, Richard G.

doi:10.1002/anie.201510394

Cited by 41 publications

(34 citation statements)

References 65 publications

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“…[32][33][34][35][36][37] Stochastic collision electrochemical measurements have been widely applied in many applications ranging from electrocatalytic amplification and direct electrochemical stripping of individual metal NPs to soft particles and blocking detection of biologically relevant samples. [38,39] Recently,Comptonsgroup assessed the electrocatalytic activity of single NPs by stochastic collision measurements. [40,41] This gave important and complementary insights into the conventional analysis usually performed on the ensemble measurements,o pening up anew possibility of testing the performance of nanomaterials in more realistic conditions when NPs are dispersed in the environment.…”

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confidence: 99%

Unveiling the Intrinsic Catalytic Activities of Single‐Gold‐Nanoparticle‐Based Enzyme Mimetics

Hafez

et al. 2019

Angewandte Chemie

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Gold nanoparticles (AuNPs) have been demonstrated to serve as effective nanomaterial-based enzyme mimetics (nanozymes) for an umber of enzymatic reactions under mild conditions.T he intrinsic glucose oxidase and peroxidase activities of single AuNPs and Ag-Au nanohybrids, respectively,w ere investigated by single NP collision electrochemical measurements.Asignificantly high turnover number of nanozymes was obtained from individual catalytic events compared with the results from the classical, ensembleaveraged measurements.The unusual enhancement of catalytic activity of single nanozymes is believed to originate from the high accessible surface area of monodispersed NPs and the high activities of carbon-supported NPs during single-particle collision at acarbon ultramicroelectrode.This work introduces an ew method for the precise characterization of the intrinsic catalytic activities of nanozymes,g iving further insights to the design of high-efficiency nanomaterial catalysts.

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confidence: 99%

Unveiling the Intrinsic Catalytic Activities of Single‐Gold‐Nanoparticle‐Based Enzyme Mimetics

Hafez

et al. 2019

Angewandte Chemie

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“…Simultaneous optical and electrochemical recordings provided comprehensive capability to correlate the physical movement of nanoparticles (from optical signal) and the electron transfer activity (from electrochemical signal). [16][17][18][19][20][21] Based on the different mechanisms, SNC studies can be classified into three typical categories: diffusion blockade, [22,23] electrocatalytic amplification, [24,25] and direct electrochemical oxidation. These results demonstrated that the electrical contact between nanoparticle and electrode, which could be rather stochastic due to thermal motion and micro-convection, played critical roles in regulating the multi-peak behavior of single silver nanoparticles.…”

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confidence: 99%

“…[10][11][12] This method has received widespread attention once proposed because it is simple, speedy, cost-effective and because it can detect the electrochemical response of a large number of individual NPs. [16][17][18][19][20][21] Based on the different mechanisms, SNC studies can be classified into three typical categories: diffusion blockade, [22,23] electrocatalytic amplification, [24,25] and direct electrochemical oxidation. In collision experiments, the frequency of collision, the magnitude and shape of the current response can provide rich information about NPs, including size distribution, concentration, and diffusion coefficient.…”

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confidence: 99%

Dynamic Nanoparticle‐Substrate Contacts Regulate Multi‐Peak Behavior of Single Silver Nanoparticle Collisions

2018

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Single nanoparticle collision (SNC) technology has attracted increasing attention to explore single nanoparticle electrochemistry. By improving the temporal resolution of electrochemical recording, several recent studies have uncovered the intermittent electron transfer processes during the SNC of single silver nanoparticles. The electrode current curve displayed multiple current peaks that were completely separated, instead of a single peak. In the present work, we employed surface plasmon resonance microscopy to monitor the collision and oxidation processes of single silver nanoparticles. Simultaneous optical and electrochemical recordings provided comprehensive capability to correlate the physical movement of nanoparticles (from optical signal) and the electron transfer activity (from electrochemical signal). While previous studies hypothesized the physical detachment of nanoparticles from the electrode due to electrostatic repulsion or Brownian motion, the optical imaging revealed that nanoparticles often remained in physical touch with the electrode even though no electron transfer was occurring. These results demonstrated that the electrical contact between nanoparticle and electrode, which could be rather stochastic due to thermal motion and micro-convection, played critical roles in regulating the multi-peak behavior of single silver nanoparticles.In the past several decades, nanoparticles (NPs) have found a wide range of applications in many different areas, including electrocatalysis, electrochemical sensing and fuel cells, because of their unique structure-dependent properties. [1][2][3] The electrochemical properties of NPs are dependent strongly on their size, shape and surface states. [4][5][6] Because of the inherent heterogeneity of NPs in terms of both structure and activity, single NP electrochemistry has been emerging rapidly due to its capability for resolving the electrochemical activity at single NP level and for offering another opportunity to establish the structure-activity relationship in a bottom-up manner. [7][8][9] In order to achieve this goal, a new strategy has emerged rapidly in the field of nanoelectrochemistry, namely single nanoparticle collision (SNC). [10][11][12] This method has received widespread attention once proposed because it is simple, speedy, cost-effective and because it can detect the electrochemical response of a large number of individual NPs. The key factor in identifying a single collision event was the use of an ultramicroelectrode (UME) as the working electrode, which not only decreased the collision frequency, but also greatly reduced the background noise. In collision experiments, the frequency of collision, the magnitude and shape of the current response can provide rich information about NPs, including size distribution, concentration, and diffusion coefficient. [13][14][15] Many groups have conducted intensive explorations in this field and achieved a series of remarkable research results. [16][17][18][19][20][21] Based on the different mechanisms, SNC ...

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“…The mechanism was revealed that the Co III in VB 12 was reduced into Co II and Co I through one or two electron transfer followed by the four‐electron reduction of oxygen . They also found that the binding of trichloroethylene with Co I in VB 12 was chemically reversible …”

Section: Development Of Nanoimpact Methodsmentioning

confidence: 99%

“…[32] They also found that the binding of trichloroethylene with Co I in VB 12 was chemically reversible. [33]…”

Section: C) Current Transients Of Particles Collision Onmentioning

confidence: 99%

Single Particle Electrochemistry of Collision

Zou

Hou

et al. 2019

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A novel electrochemistry method using stochastic collision of particles at microelectrode to study their performance in single‐particle scale has obtained remarkable development in recent years. This convenient and swift analytical method, which can be called “nanoimpact,” is focused on the electrochemical process of the single particle rather than in complex ensemble systems. Many researchers have applied this nanoimpact method to investigate various kinds of materials in many research fields, including sensing, electrochemical catalysis, and energy storage. However, the ways how they utilize the method are quite different and the key points can be classified into four sorts: sensing particles at ultralow concentration, theory optimization, kinetics of mediated catalytic reaction, and redox electrochemistry of the particles. This review gives a brief overview of the development of the nanoimpact method from the four aspects in a new perspective.

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Quantifying the Electrocatalytic Turnover of Vitamin B₁₂‐Mediated Dehalogenation on Single Soft Nanoparticles

Cited by 41 publications

References 65 publications

Unveiling the Intrinsic Catalytic Activities of Single‐Gold‐Nanoparticle‐Based Enzyme Mimetics

Unveiling the Intrinsic Catalytic Activities of Single‐Gold‐Nanoparticle‐Based Enzyme Mimetics

Dynamic Nanoparticle‐Substrate Contacts Regulate Multi‐Peak Behavior of Single Silver Nanoparticle Collisions

Single Particle Electrochemistry of Collision

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Quantifying the Electrocatalytic Turnover of Vitamin B12‐Mediated Dehalogenation on Single Soft Nanoparticles

Cited by 41 publications

References 65 publications

Unveiling the Intrinsic Catalytic Activities of Single‐Gold‐Nanoparticle‐Based Enzyme Mimetics

Unveiling the Intrinsic Catalytic Activities of Single‐Gold‐Nanoparticle‐Based Enzyme Mimetics

Dynamic Nanoparticle‐Substrate Contacts Regulate Multi‐Peak Behavior of Single Silver Nanoparticle Collisions

Single Particle Electrochemistry of Collision

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Quantifying the Electrocatalytic Turnover of Vitamin B₁₂‐Mediated Dehalogenation on Single Soft Nanoparticles