Fabrication of nanoporous gold-islands via hydrogen bubble template: An efficient electrocatalyst for oxygen reduction and hydrogen evolution reactions

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

doi:10.1016/j.ijhydene.2019.04.186

Cited by 31 publications

(18 citation statements)

References 53 publications

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“…Gold nanoparticles were electrogenerated on screen-printed electrodes by applying a constant potential of − 4.0 V in an electrochemical cell containing 20 mL 5.0 mmol L −1 hydrogen tetrachloroaurate (III) solution with 0.5 mol L −1 sulfuric acid under vigorous stirring for 9 s (or 30 s or 90 s) (Fig. 1b) [30].…”

Section: Electrodeposition Of Goldmentioning

confidence: 99%

Electrochemical immunosensors using electrodeposited gold nanostructures for detecting the S proteins from SARS-CoV and SARS-CoV-2

et al. 2022

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This paper reports the development of a low-cost (< US$ 0.03 per device) immunosensor based on gold-modified screenprinted carbon electrodes (SPCEs). As a proof of concept, the immunosensor was tested for a fast and sensitive determination of S proteins from both SARS-CoV and SARS-CoV-2, by a single disposable device. Gold nanoparticles were electrochemically deposited via direct reduction of gold ions on the electrode using amperometry. Capture antibodies from spike (S) protein were covalently immobilized on carboxylic groups of self-assembled monolayers (SAM) of mercaptoacetic acid (MAA) attached to the gold nanoparticles. Label-free detection of S proteins from both SARS-CoV and SARS-CoV-2 was performed with electrochemical impedance spectroscopy (EIS). The immunosensor fabricated with 9 s gold deposition had a high performance in terms of selectivity, sensitivity, and low limit of detection (LOD) (3.16 pmol L −1 ), thus permitting the direct determination of the target proteins in spiked saliva samples. The complete analysis can be carried out within 35 min using a simple one-step assay protocol with small sample volumes (10 µL). With such features, the immunoplatform presented here can be deployed for mass testing in point-of-care settings.

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Section: Electrodeposition Of Goldmentioning

confidence: 99%

Electrochemical immunosensors using electrodeposited gold nanostructures for detecting the S proteins from SARS-CoV and SARS-CoV-2

et al. 2022

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“…Nanoporous gold (NPG) has emerged as an interesting electrode material due to its huge surface area and metallic nature that offers high electrical conductivity. [1] The use of this material was explored for critical reactions in fuel cell technology, such as oxygen reduction, [2] hydrogen evolution [3] and carbon monoxide oxidation. [4] Moreover, NPG exhibits good performance for alcohol electrooxidation, [5,6] especially in alkaline media.…”

Section: Introductionmentioning

confidence: 99%

Restructuring of Nanoporous Gold Surfaces During Electrochemical Cycling in Acidic and Alkaline Media

2020

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The electrochemical behavior of nanoporous gold (NPG) obtained by dealloying a AgAu alloy has been investigated by means of cyclic voltammetry (CV) in 0.1 M H2SO4 and 0.1 M KOH solutions supplemented by X‐ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) in order to understand different effects of the electrochemical treatment on the development of the surface structure of NPG. In order to reduce the IR drop caused by the high surface area of the bicontinuous network of pores and ligaments in NPG, NPG was transformed to a powder, from which a small portion was filled into a cavity microelectrode (CME). Additionally, this avoided sample‐to‐sample variation from the dealloying process because many fillings could be made from one NPG monolith. The cycling in 0.1 M H2SO4 led to restructuring of the surface to a more faceted one, only after the residual silver on the surface had been removed in the initial scan. The same cycling program in 0.1 M KOH did not cause restructuring. However, a transfer of the sample to 0.1 M H2SO4 could start the process. The ligament size did not change during restructuring. Additionally, it was found that residual Ag in NPG stabilizes the highly curved surfaces of the ligaments containing a high density of surface defects. The dissolution of the residual Ag in acid electrolytes lifts the blockage towards surface restructuring. These findings form a basis for understanding the electrochemical behavior of NPG and to devise appropriate treatments, for instance for their use in electrocatalysis.

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“…reported an NPG film electrode for ORR, but its main application was for sensing dissolved oxygen (DO) concentration, not meant for fuel cell electro‐catalysis [50] . The same group reported NPG islands deposited on glassy carbon electrode and its enhanced ORR activity, but this study was more focused on presenting a new preparation method of an electrode by hydrogen bubble templates [51] …”

Section: Application To Fuel Cellsmentioning

confidence: 99%

Nanoporous Gold for Energy Applications

Kim

2021

The Chemical Record

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Research activities using nanoporous gold (NPG) were reviewed in the field of energy applications in three categories: fuel cells, supercapacitors, and batteries. First, applications to fuel cells are reviewed with the subsections of proof‐of‐concept studies, studies on fuel oxidations at anode, and studies on oxygen reduction reactions at cathode. Second, applications to supercapacitors are reviewed from research activities on active materials/NPG composites to demonstrations of all‐solid‐state flexible supercapacitors using NPG electrodes. Third, research activities using NPG for battery applications are reviewed, mainly about fundamental studies on Li‐air and Na‐air batteries and some model studies on improving Li ion battery anodes. Although NPG based studies are the main subject of this review, some of meaningful studies using nanoporous metals are also discussed where relevant. Finally, summary and future outlook are given based on the survey on the research activities.

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Fabrication of nanoporous gold-islands via hydrogen bubble template: An efficient electrocatalyst for oxygen reduction and hydrogen evolution reactions

Cited by 31 publications

References 53 publications

Electrochemical immunosensors using electrodeposited gold nanostructures for detecting the S proteins from SARS-CoV and SARS-CoV-2

Electrochemical immunosensors using electrodeposited gold nanostructures for detecting the S proteins from SARS-CoV and SARS-CoV-2

Restructuring of Nanoporous Gold Surfaces During Electrochemical Cycling in Acidic and Alkaline Media

Nanoporous Gold for Energy Applications

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