A facile electrochemical approach to fabricate a nanoporous gold film electrode and its electrocatalytic activity towards dissolved oxygen reduction

Sukeri, Anandhakumar; Hernández-Saravia, Lucas Patricio; Bertotti, Mauro

doi:10.1039/c5cp05220c

Cited by 84 publications

(76 citation statements)

References 52 publications

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“…Further, in order to confirm the structural changes on the electrode surface, a morphological analysis (FE‐SEM) of the bare Au‐μE and the electrochemically fabricated NPG‐μE was performed (Figure ). A smooth surface with slight scratches can be seen for the bare Au‐μE (A‐B), whereas continuous interconnected three‐dimensional nanoporous structures can be noticed in the FE‐SEM images of the NPG‐μE (C‐D) at different magnifications, in agreement with our previous report . This high surface area and porous nanostructured gold surface was utilized for arsenic detection via stripping voltammetry.…”

Section: Resultssupporting

confidence: 89%

Nanoporous Gold Microelectrode: A Novel Sensing Platform for Highly Sensitive and Selective Determination of Arsenic (III) using Anodic Stripping Voltammetry

et al. 2017

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A home‐made gold microelectrode (Au‐μE) was fabricated and its surface was modified with nanoporous gold structures via a facile electrochemical approach (anodization followed by electrochemical reduction method). The fabricated nanoporous Au microelectrode (NPG‐μE) was used as a sensor probe for the determination of As(III) in 1.0 mol L−1 HCl solution using square wave anodic stripping voltammetry (SWASV) technique. Field emission scanning electron microscopy (FE‐SEM) and cyclic voltammetry were used to characterize the surface morphology and assess the electrochemical surface area and the roughness factor of the NPG‐μE. SWASVs recorded with the NPG‐μE in As(III) solutions indicated linear behaviour in the concentration ranges of 10–200 μg L−1 and 2–30 μg L−1, with regression coefficients of 0.996 and 0.999 at a deposition time of 120 s, respectively. The limit of detection (LOD) was found to be 0.62 μg L−1 with high sensitivity of 29.75 μA (μg L−1)−1 cm−2. Repeatability and reproducibility were also examined and values were determined as 3.2 % and 9.0 %. Negligible interference from major interfering copper ion was noticed, revealing the excellent anti‐interference property of the proposed sensing platform. The developed NPG‐μE was successfully used for As(III) determination in tap water samples.

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Section: Resultssupporting

confidence: 89%

Nanoporous Gold Microelectrode: A Novel Sensing Platform for Highly Sensitive and Selective Determination of Arsenic (III) using Anodic Stripping Voltammetry

et al. 2017

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“…A smooth surface with slight scratches are observed for the bare Au electrode, whereas an extremely rough surface with porous nanostructures with an average pore size of 32 nm along with large defective sites and/or edges was noticed for the NPGF electrode. 40 Typically, such kind of pore structure has large surface area and roughness factor and can be more beneficial for electron transfer processes, leading to enhanced electrocatalytic activity for many electrochemical reactions. Besides, recently we witnessed the absence of oxide formation on the fabricated NPGF surface through energy dispersive X-ray analysis (EDX), 41 which confirms the outstanding purity of the NPGF compared to the material prepared by dealloying or template based methods.…”

Section: Resultsmentioning

confidence: 99%

“…Also, in order to further confirm the porous nature of the Au film, the electrochemical surface area (ECSA) was calculated using the Au oxide reduction peak by a charge-integration method. 40 Values were found to be 0. 34 42 have recently shown the relationship between the Au oxide peaks and the low-index crystal planes of the polycrystalline gold by using cyclic voltammetry in acid medium.…”

Section: Electrochemical Characterization Of the Npgf Electrodementioning

confidence: 96%

“…40 Briefly, the potential of a gold electrode was cycled from 0.0 to 2.0 V at the scan rate of 0.02 V s -1 in a 0.5 mol L -1 H 2 SO 4 solution and the electrode potential was held at 2.0 V for 60 min after the forward scan, where a gold oxide film (orange-yellowish color) was formed on the electrode surface. Afterwards, the generated oxide film was reduced in the reverse scan to form a nanoporous gold film (black color).…”

Section: Fabrication Of the Npgf Electrodementioning

confidence: 99%

“…40 In this work, the attempt has been made to evaluate the electrocatalytic activity of the NPGF electrode towards HER in acid medium and excitingly we observed a platinum-like performance at very low overpotential along with excellent durability.…”

Section: Introductionmentioning

confidence: 99%

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Nanoporous Gold Surface: An Efficient Platform for Hydrogen Evolution Reaction at Very Low Overpotential

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2017

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Complementary Cost‐Effective Electrochemical Platforms for Point‐Of‐Use Biosensing

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et al. 2024

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The COVID‐19 pandemic has illustrated the urgent need for rapid and affordable point‐of‐use diagnostics. Electrochemical biosensors are useful for such applications because they enable quantitative readout and show drastically improved sensitivity compared to prevalent lateral flow technologies. However, to‐date, the poor quality of commercially‐available, mass‐produced electrodes has prohibited the scaled production and commercialization of such biosensors beyond glucose sensing. Low‐cost gold leaf electrodes have previously been developed that can be fabricated with no specialized equipment at the point‐of‐use. These electrodes are more effective for biosensing than prevalent commercially‐available systems. Yet, their manual fabrication can be tedious and is not scalable in its current form. Here, performance of mass‐produced gold electrodes generated using roll‐to‐roll manufacturing is evaluated, offering the potential to scale production. Upon comparison of these electrodes with the gold leaf, it is found that these electrodes are high quality, equivalent to the gold leaf electrodes, and support biosensing applications through the detection of both DNase I and BtsI‐v2 activity with comparable performance. These results demonstrate the role of complementary technologies to achieve point‐of‐use sensing by enabling flexibility between mass‐produced manufacture and on‐site production.

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A facile electrochemical approach to fabricate a nanoporous gold film electrode and its electrocatalytic activity towards dissolved oxygen reduction

Cited by 84 publications

References 52 publications

Nanoporous Gold Microelectrode: A Novel Sensing Platform for Highly Sensitive and Selective Determination of Arsenic (III) using Anodic Stripping Voltammetry

Nanoporous Gold Microelectrode: A Novel Sensing Platform for Highly Sensitive and Selective Determination of Arsenic (III) using Anodic Stripping Voltammetry

Nanoporous Gold Surface: An Efficient Platform for Hydrogen Evolution Reaction at Very Low Overpotential

Complementary Cost‐Effective Electrochemical Platforms for Point‐Of‐Use Biosensing

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