The mechanism of electrochemical reduction of hydrogen peroxide on silver nanoparticles

Cai, Xiaosheng; Tanner, Eden E. L.; Lin, Chin E.; Ngamchuea, Kamonwad; Foord, John S.; Compton, Richard G.

doi:10.1039/c7cp07492a

Cited by 42 publications

(32 citation statements)

References 41 publications

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“…[80] To clarify the mechanism of electrochemical reduction and oxidation of H 2 O 2 , the catalytic performance was explored using methods including cyclic voltammetry, rotating disk electrode experiments, surface-enhanced Raman spectroscopy, theoretical calculations (DFT, ab initio, etc), et al [81,82] Though there might be other uncovered approach, [83] recent reaction mechanism based on metal catalysts confirms the OH ads intermediate with experimental and theoretical evidence. [84][85][86] The reduction and oxidation mechanisms of H 2 O 2 on metal catalyst in acid and base could be briefly described as Equations (5)- (7) and (8)-(10), respectively, with OH ads formation as an important step. [87,88] Recent theoretical calculations reveal the presence of OH* intermediates on carbon interface, [89,90] which provides good reference for further catalysts researches of efficient and inexpensive catalysts.…”

Section: Electrochemical Detection Of Hydrogen Peroxidementioning

confidence: 99%

Free‐Standing 3D Electrodes for Electrochemical Detection of Hydrogen Peroxide

et al. 2019

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Electrochemical detection of hydrogen peroxide has achieved rapid development, due to the wide presence in industrial production, everyday life, bioprocess and green energy chemistry, etc. Many three‐dimensional structures have emerged as state‐of‐the‐art electrocatalysts due to their fascinating structures and electrochemical properties. This review summarizes free‐standing three‐dimensional electrocatalysts based on metal, metal oxide, carbon & silicon, and unconventional materials for detection of hydrogen peroxide with low limit of detection, wide range and fast response. The work also highlights their applications in near neutral conditions, especially their ability for single cell detection and mapping in biological environment. Further exploration into these materials together with devices design will facilitate the development of next‐generation detection technologies toward in situ and real‐time detection and contribute to wearable/portable smart detection electronics.

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Section: Electrochemical Detection Of Hydrogen Peroxidementioning

confidence: 99%

Free‐Standing 3D Electrodes for Electrochemical Detection of Hydrogen Peroxide

et al. 2019

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“…Anodic stripping voltammetry in 0.1 M NaClO 4 solution in absence of AgNPs confirmed the presence of particles on the CNE surface ( Figure S4, SI). In contrast, we found that for citrate-capped AgNPs, a common model system in literature [19] rather elastic impacts are monitored on bifunctional CNEs. It is possible to immobilize single AgNPs on CNEs and they are adhering sufficiently stable to allow detailed further characterization.…”

Section: Resultsmentioning

confidence: 60%

Oxygen Reduction Activity and Reversible Deactivation of Single Silver Nanoparticles during Particle Adsorption Events

et al. 2018

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The activity towards the oxygen reduction reaction (ORR) of single silver nanoparticles (AgNP) was quantified by using AgNP impacts on dual-bore carbon nanoelectrodes in highly alkaline media. We found suitable conditions for the particles to adhere sufficiently stably for detailed electrochemical characterization of a single particle. The special electrode design opens the possibility to dose gaseous oxygen to the nanoparticle under study. Deactivation of the catalytic activity of the AgNP upon excessive exposure to oxygen as well as the recovery of catalytic activity under reducing conditions is presumably attributed to hydrogen evolution at the applied low potentials. The proposed approach allows mechanistic parameters for the ORR to be extracted at a single AgNP in highly alkaline media in the absence of any binder materials and under exclusion of averaging ensemble effects.

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“…S3, the peak of H 2 O 2 decomposition recorded at E = − 1.34 V for an electrode modified with biochar is significantly higher compared to the response of the unmodified electrode indicating the potential of biochar to serve as a successful catalyst for the decomposition of the target molecule (H 2 O 2 ). As a single reduction peak is observed, one can conclude that the reaction mechanism obeys the reported 2e − , 2H + reduction pathway according to the following equations (Cai et al 2018):…”

Section: Electrochemical Measurementsmentioning

confidence: 54%

Biochars and their magnetic derivatives as enzyme-like catalysts mimicking peroxidases

Šafařı́k

Procházková

Baldíková

et al. 2020

Biochar

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Various materials have been extensively investigated to mimic the structures and functions of natural enzymes. We describe the discovery of a new catalytic property in the group of biochar-based carbonaceous materials, which are usually produced during biowaste thermal processing under specific conditions. The tested biochars exhibited peroxidase-like catalytic activity. Biomaterial feedstock, pyrolysis temperature, size of resulting biochar particles or biochar modification (e.g., magnetic particles deposition) influenced the peroxidase-like activity. Catalytic activity was measured with the chromogenic organic substrates N,N-diethyl-p-phenylenediamine (DPD) or 3,3′,5,5′-tetramethylbenzidine (TMB), in the presence of hydrogen peroxide. Magnetic biochar composite was studied as a complementary material, in which the presence of iron oxide particles enhances catalytic activity and enables smart magnetic separation of catalyst even from complex mixtures. The activity of the selected biochar had an optimum at pH 4 and temperature 32 °C; biochar catalyst can be reused ten times without the loss of activity. Using DPD as a substrate, K m values for native wood chip biochar and its magnetic derivative were 220 ± 5 μmol L −1 and 690 ± 80 μmol L −1 , respectively, while V max values were 10.1 ± 0.3 μmol L −1 min −1 and 16.1 ± 0.4 μmol L −1 min −1 , respectively. Biochar catalytic activity enabled the decolorization of crystal violet both in the model solution and the fish pond water containing suspended solids and dissolved organic matter. The observed biochar enzyme mimetic activity can thus find interesting applications in environmental technology for the degradation of selected xenobiotics. In general, this property predestines the low-cost biochar to be a perspective supplement or even substitution of common peroxidases in practical applications.

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The mechanism of electrochemical reduction of hydrogen peroxide on silver nanoparticles

Cited by 42 publications

References 41 publications

Free‐Standing 3D Electrodes for Electrochemical Detection of Hydrogen Peroxide

Free‐Standing 3D Electrodes for Electrochemical Detection of Hydrogen Peroxide

Oxygen Reduction Activity and Reversible Deactivation of Single Silver Nanoparticles during Particle Adsorption Events

Biochars and their magnetic derivatives as enzyme-like catalysts mimicking peroxidases

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