Impact electrochemistry reveals that graphene nanoplatelets catalyse the oxidation of dopamine<i>via</i>adsorption

Chen, Lifu; Tanner, Eden E. L.; Lin, Chin E.; Compton, Richard G.

doi:10.1039/c7sc03672h

Cited by 31 publications

(25 citation statements)

References 38 publications

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“…Single NP collision electrochemistry has attracted increasing interest over the past decades, motivated by the unique electrochemical behaviors of single NPs during their stochastic collision processes at an ultramicroelectrode (UME) surface, unveiling the intrinsic properties masked in ensemble‐averaged measurements . 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 .…”

Section: Figuresupporting

confidence: 89%

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

Hafez

2019

Angew Chem Int Ed

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Gold nanoparticles (AuNPs) have been demonstrated to serve as effective nanomaterial‐based enzyme mimetics (nanozymes) for a number of enzymatic reactions under mild conditions. The intrinsic glucose oxidase and peroxidase activities of single AuNPs and Ag–Au nanohybrids, respectively, were investigated by single NP collision electrochemical measurements. A significantly high turnover number of nanozymes was obtained from individual catalytic events compared with the results from the classical, ensemble‐averaged 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 a carbon ultramicroelectrode. This work introduces a new method for the precise characterization of the intrinsic catalytic activities of nanozymes, giving further insights to the design of high‐efficiency nanomaterial catalysts.

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Section: Figuresupporting

confidence: 89%

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

Hafez

2019

Angew Chem Int Ed

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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. [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.…”

mentioning

confidence: 99%

“…Single NP collision electrochemistry has attracted increasing interest over the past decades,m otivated by the unique electrochemical behaviors of single NPs during their stochastic collision processes at an ultramicroelectrode (UME) surface,u nveiling the intrinsic properties masked in ensemble-averaged measurements. [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.…”

mentioning

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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“…The partial oxidation of dopamine suggested that the continuous electron transfer was blocked by the previous oxidative products, revealing the fact that the electrons were transferred on the surface of GNPs rather than passing through them (Figure d). The conclusion provided the support information for the better understanding of the oxidation of dopamine catalyzed by GNPs …”

Section: Development Of Nanoimpact Methodsmentioning

confidence: 70%

Section: Development Of Nanoimpact Methodsmentioning

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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Impact electrochemistry reveals that graphene nanoplatelets catalyse the oxidation of dopamineviaadsorption

Abstract: Single entity measurements (‘nano-impacts’) reveal that adsorption of dopamine and its oxidised product on the graphene is the key factor causing the observed catalysis.

Cited by 31 publications

References 38 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

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

Single Particle Electrochemistry of Collision

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