Monolithic Au Nanoscale Films with Tunable Nanoporosity Prepared via Dynamic Soft Templating for Electrocatalytic Oxidation of Methanol

Shiba, Shoichi; Hirabayashi, Shoei; Niwa, Osamu; Kato, Dai; Kunitake, Masashi; Matsuguchi, Masanobu

doi:10.1021/acsanm.0c01316

Cited by 11 publications

(23 citation statements)

References 61 publications

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“…The aqueous phase of BME acted as a medium for gold electrodeposition and the intertwined structure came from the aqueous and oil phases of BME compartmentalized by surfactant and cosurfactant. The resultant film nanostructure has been controlled by adjusting the initial BME composition and by varying kinetic parameters such as deposition potential and time [53].…”

Section: Electrodepositionmentioning

confidence: 99%

Electrodeposition of Nanoporous Gold Thin Films

Sondhi¹,

Stine²

2021

Nanofibers - Synthesis, Properties and Applications

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Nanoporous gold (NPG) films have attracted increasing interest over the last ten years due to their unique properties of high surface area, high selectivity, and electrochemical activity along with enhanced electrical conductivity, and chemical stability. A variety of fabrication techniques to synthesize NPG thin films have been explored so far including dealloying, templating, sputtering, self-assembling, and electrodeposition. In this review, the progress in the synthetic techniques over the last ten years to prepare porous gold films has been discussed with emphasis given on the technique of electrodeposition. Such films have wide-ranging applications in the fields of drug delivery, energy storage, heterogeneous catalysis, and optical sensing.

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Section: Electrodepositionmentioning

confidence: 99%

Electrodeposition of Nanoporous Gold Thin Films

Sondhi¹,

Stine²

2021

Nanofibers - Synthesis, Properties and Applications

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“…BME solution with a water/oil ratio of 53/47 (equally mixed BME) was prepared according to our previous report. (16) Briefly, 0.40 g of SDS, 5.00 mL of 1 M HCl aqueous solution containing 50 mM HAuCl 4 , and 510 μL of 2m2b were mixed in a glass tube. Then, the mixture solution was ultrasonicated for 15 min to fully dissolve the SDS.…”

Section: Preparation Of Bme Solutionsmentioning

confidence: 99%

“…In our previous report, we optimized the electrodeposition potential in terms of the nanostructure and concluded that excessive negative potential (−0.30 V vs Ag/AgCl) is required to form the NPGF on the sputtered Au film electrode. (16) However, the electrochemical behavior of a microelectrode is generally different from that of a macroelectrode owing to the difference in the shape of the diffusion layer. To investigate the electrodeposition potential of AuCl 4…”

Section: Investigation Of the Electrodeposition Kinetics In Equally Mixed Bmementioning

confidence: 99%

“…Recently, we have developed a new synthesis methodology for a monolithic nanoporous gold film (NPGF) by using a bicontinuous microemulsion (BME) as a dynamic soft template. (16) The BME forms three-dimensional intertwined networks of aqueous and oil channels on the order of less than 100 nm, which are separated by a surfactant and a cosurfactant. Tetrachloroauric ions (AuCl 4 − ), which are distributed in the aqueous phase in the BME, are electrodeposited on the sputtered gold film, providing a variety of nanostructure-controlled monolithic NPGFs.…”

Section: Introductionmentioning

confidence: 99%

“…The observed electrodeposition potential was the same as that previously reported. (16) However, the microelectrode exhibited electrochemical behavior below +0.68 V that was different from that of the macroelectrode. In the case of the macroelectrode, a reduction peak current was observed and the reduction current after the peak potential was almost constant.…”

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Arsenic Detection with Porous Gold Microelectrode Prepared via Dynamic Soft Templating

Shiba¹,

Matsuguchi²

2021

Sensors and Materials

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A porous gold microelectrode (μAuE) was fabricated by dynamic soft templating and used for the square-wave anodic stripping analysis of As(III). The porous μAuE was fabricated by the electrodeposition of AuCl 4 − dissolved in a bicontinuous microemulsion (BME), which has an intertwined three-dimensional network composed of aqueous and oil phases compartmentalized by a surfactant and a cosurfuctant, and acts as a dynamic soft template. A 41.5-fold increase in electrochemically active surface area (ECSA) was confirmed after electrodeposition, while the microelectrode characteristics were still observed. Cyclic voltammetry revealed that the porous μAuE has abundant Au{100} and/or kink/step sites compared with bare μAuE. The overpotential for As(III) reduction decreased by 0.1 V at the porous μAuE, which may be due to exposed Au facets. A limit of detection (LOD) of less than 5 ppb and a wider linear range from 5 to 1000 ppb were confirmed when using the porous μAuE, which were due to the increased ECSA. In addition, the sensitivity at the porous μAuE was calculated to be 44.0 μA cm −2 geo ppb −1 , 14.4 times higher than that at the bare μAuE.

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Structure–Activity Relationships in Oxygen Electrocatalysis

Han,

Sun,

Chen

et al. 2024

Advanced Materials

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Oxygen electrocatalysis, as the pivotal circle of many green energy technologies, sets off a worldwide research boom in full swing, while its large kinetic obstacles require remarkable catalysts to break through. Here, based on summarizing reaction mechanisms and in situ characterizations, the structure–activity relationships of oxygen electrocatalysts are emphatically overviewed, including the influence of geometric morphology and chemical structures on the electrocatalytic performances. Subsequently, experimental/theoretical research is combined with device applications to comprehensively summarize the cutting‐edge oxygen electrocatalysts according to various material categories. Finally, future challenges are forecasted from the perspective of catalyst development and device applications, favoring researchers to promote the industrialization of oxygen electrocatalysis at an early date.

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Monolithic Au Nanoscale Films with Tunable Nanoporosity Prepared via Dynamic Soft Templating for Electrocatalytic Oxidation of Methanol

Cited by 11 publications

References 61 publications

Electrodeposition of Nanoporous Gold Thin Films

Electrodeposition of Nanoporous Gold Thin Films

Arsenic Detection with Porous Gold Microelectrode Prepared via Dynamic Soft Templating

Structure–Activity Relationships in Oxygen Electrocatalysis

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