Electrodeposition of gold on oxidized and reduced graphite surfaces and its influence on glucose oxidation

Escalona-Villalpando, Ricardo A.; Gurrola, M.P.; Trejo, G.; Guerra‒Balcázar, Minerva; Ledesma‐García, J.; Arriaga, L.G.

doi:10.1016/j.jelechem.2018.03.037

Cited by 41 publications

(20 citation statements)

References 60 publications

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“…The emerging material to load nanoparticles is frequently used to pretend nanoparticles aggregation, but the usage of various material complicate the fabrication process . Direct electrodeposition of gold nanoparticles could overcome complicated preparation and usage of emerging materials . For example, Chiang et al prepared electrodeposited gold nanoparticles surface by studying three different methods of gold surface preparation .…”

Section: Introductionsupporting

confidence: 89%

Nanostructured Gold Microelectrodes for Non‐enzymatic Glucose Sensor

et al. 2019

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A novel, highly stable, selective, and sensitive non‐enzymatic glucose sensor was developed by simple and effective modification procedure. The modification of gold microelectrodes by electrochemically deposited gold nanoparticles resulted in increase of surface area up to 37 %. The nanostructured surfaces of the gold microelectrodes obtained by different modifications were studied by confocal microscopy, atomic force microscopy, and scanning electron microscopy. The gold nanoclusters exhibit great electrocatalytic properties toward glucose with a wide linear range from 0.5 to 50 mM, with a limit of detection 218 μM, and sensitivity of 185.2 mA mM−1cm−2. Moreover, the modified microelectrodes display good reproducibility, stability, and selectivity in the presence of poisoning compounds. Due to the small dimensions of gold microelectrodes and a very small volume of the sample, the microelectrodes make a contribution to miniaturisation of the system.

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Section: Introductionsupporting

confidence: 89%

Nanostructured Gold Microelectrodes for Non‐enzymatic Glucose Sensor

et al. 2019

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“…Typical two well-distinguished anodic peaks A1 and A2 for glucose oxidation at the bare Au electrode disappear transforming into one broadly spread peak. This suggests that the oxidation processes of glucose and gluconolactone occur consecutively or very quickly [42]. The location of the overall anodic peak A for both catalysts is shifted into a more negative potential region.…”

Section: Resultsmentioning

confidence: 86%

“…-0.1 V and another one at more positive potential values at ca. 0.4 V, are attributed to the oxidation of adsorbed glucose to gluconolactone [31,40,41] and to further oxidation of gluconolactone to gluconate [28,39,40,42], respectively. The third poorly expressed peak A3 is related to the formation of a gold oxide layer, which leads to the decrease of AuOH and, therefore, current density falls down.…”

Section: Resultsmentioning

confidence: 99%

“…It has been noted that the rate of the electro-oxidation of glucose on Au is higher in an alkaline environment than that in an acidic or neutral one and occurs at more negative potentials as compared to the other metals [37,38,46]. Therefore, the mechanism of glucose electrooxidation has been intensively studied in detail at different solution pH values, concentrations and by using different techniques [23,28,31,39,[40][41][42]. However, up till now the studies do not agree unambiguously neither on the peak nor wave assignments in CV curves for glucose oxidation at Au.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of glucose electro-oxidation on Co and CoB alloy coatings modified with Au nanoparticles

Upskuvienė¹,

Sukackienė²,

Balčiūnaitė³

et al. 2019

chemija

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The electrochemical oxidation of glucose was investigated on the Co and CoB alloy coatings, which were deposited on the copper substrate (Cu) and subsequently modified with a small amount of Au nanocrystallites. The catalysts were prepared via a simple electroless Co deposition method followed by a spontaneous Au galvanic displacement from the Au(III)-containing solution. The activity of Co and CoB alloy coatings modified with Au crystallites towards the oxidation of glucose was examined by the cyclic voltammetry method.It has been determined that the Co and CoB alloy coatings, which were modified with a small amount of Au crystallites, exhibit a significantly higher activity for the oxidation of glucose as compared to that of bare Au, Co and CoB alloy catalysts. The process of glucose oxidation is significantly shifted to a more negative potential domain at the both Co/Cu and CoB/Cu catalysts modified by Au nanocrystallites, indicating the higher activity of those catalysts as compared to that of the unmodified Co/Cu and CoB/Cu catalysts and the bare Au electrode. It was found that ca. 22 and even 67 times higher glucose oxidation current density values have been obtained at the AuCo/Cu and AuCoB/Cu catalysts, respectively, as compared to those for the unmodified CoB/ Cu and Co/Cu.

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“…By surface modification with chemical treatment using Fe3O4 nanoparticles, the surface area of pre-treated graphite waste increase up to 35.52 m 2 /g [4]. Modification of the graphite surface is one of the wellknown strategies to increase its surface area to improve the mechanical properties and to enable modification of the functional groups on its surface [8].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of graphite/magnetite composite as low cost potential adsorbent from graphite waste

et al. 2018

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The comparative properties of pre-treated graphite waste and composite with magnetite nanoparticles were studied. The present work describes the thermal-mechanical method for pre-treated graphite electrode waste and chemical modification on the pre-treated graphite waste with magnetite nanoparticles (Fe3O4). The raw material is graphite electrode waste. The variables of temperature and time that affected the properties of pre-treated graphite waste was also observed. Pre-treated of graphite electrode waste was prepared via thermal process at temperatures of 60, 75, 90°C and various times of 30, 60 and 90 minutes, followed by mechanical crushing of the resultant graphite waste to 75 μm particle size. The synthetic material (graphite waste/Fe3O4 composite) was prepared with hydrochloric acid (0.1 M) for activation of the pre-treated graphite waste, followed by chemical modification with pre-treated graphite waste to Fe3O4 mass ratio 1: 1 (w/w). The experimental results showed that the pre-treated graphite waste are non-porous. Effect of magnetite nanoparticles (Fe3O4) revealed that the surface area of graphite waste/Fe3O4 composite increased from 8.44 m2/g to 64.58 m2/g. The EDX composition of Fe increased from 0.08 to 38.68 wt%, indicated that the modification of Fe3O4 nanoparticles onto graphite waste was carried out successfully. This data is useful for the preliminary treatment process of graphite electrode waste for further applications that require adsorbent preparation and modification.

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Electrodeposition of gold on oxidized and reduced graphite surfaces and its influence on glucose oxidation

Cited by 41 publications

References 60 publications

Nanostructured Gold Microelectrodes for Non‐enzymatic Glucose Sensor

Nanostructured Gold Microelectrodes for Non‐enzymatic Glucose Sensor

Investigation of glucose electro-oxidation on Co and CoB alloy coatings modified with Au nanoparticles

Synthesis and characterization of graphite/magnetite composite as low cost potential adsorbent from graphite waste

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