Electrodeposited platinum on de-alloyed nanoporous gold with enhanced electro-catalytic performance

Xue, Yang; Scaglione, Federico; Rizzi, Paola; Battezzati, Livio; Denis, Pierre; Fecht, Hans‐Jörg

doi:10.1016/j.apsusc.2019.01.099

Cited by 21 publications

(11 citation statements)

References 47 publications

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“…In the case of an amorphous precursor, ligaments are made up of many nanocrystals [ 12 ] originated by the germination during the transition from amorphous to crystalline structure [ 13 , 14 ]: When lesser noble atoms of the amorphous alloy are dissolved in the electrolyte, more noble atoms are freed by lateral coordination and move as ad-atoms by surface diffusion forming clusters that grow in dimension with the proceeding of the process until they impinge together forming ligaments. As a result, ligaments obtained from the dealloying of an amorphous precursor are multigrained, with more active sites at the grain boundaries and defects, making them more favorable in electrocatalysis applications [ 15 , 16 , 17 ] and surface-enhanced Raman spectroscopy (SERS) [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Breaking Down SERS Detection Limit: Engineering of a Nanoporous Platform for High Sensing and Technology

2022

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In this study, nanoporous gold (NPG) was synthesized by free corrosion dealloying of an amorphous precursor, Au20Cu48Ag7Pd5Si20 (at. %), in a mixture of nitric and hydrofluoric acid, starting from amorphous melt-spun ribbons. NPG revealed a 3D nanoporous structure composed of pores and multigrain ligaments of an average size of 60 nm. NPG was further anodized in oxalic acid at 8 V vs. Ag/AgCl reference electrode to obtain a bimodal morphology composed of ligaments disrupted in finer features. Both NPG and anodized samples (A-NPG) were found to be mechanically stable to bending and active for surface-enhanced Raman scattering (SERS). SERS activity of samples was investigated using 4,4′-bipyridine as a probe molecule. A detection limit of 10−16 M was found for both samples, but in A-NPG, the signal was strongly enhanced. The extremely high enhancement obtained for A-NPG is attributed both to the small size of ligaments and crystals of which they are made, as well as to the nanometric features resulting from anodization treatment. Such a microstructure showed homogenous SERS response in terms of average enhancement all across the surface, as demonstrated by mapping measurements. Furthermore, NPG and A-NPG were tested as electrodes for electrocatalytic applications, showing good properties. The engineering steps from the amorphous precursor to A-NPG led us to obtain a high-sensing platform, with extremely low detection limit and intrinsic properties, that might significantly contribute to the cutting-edge technology of the future.

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Section: Introductionmentioning

confidence: 99%

Breaking Down SERS Detection Limit: Engineering of a Nanoporous Platform for High Sensing and Technology

2022

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“…The preparation of materials that have both a high surface area and a precise and controlled morphology is of vital importance in many applications, in particular in sensors and in the field of catalysis in general [ 1 , 2 , 3 ]. The dynamic hydrogen bubble template (DHBT) method is quite attractive and has been proven to be excellent in that regard; it generates clean and porous structures in an efficient and rapid way in the absence of inorganic and organic templates [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

Rapid Fabrication of Fe and Pd Thin Films as SERS-Active Substrates via Dynamic Hydrogen Bubble Template Method

Raj¹,

Scaglione²,

Rizzi³

2022

Nanomaterials

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Fe and Pd thin film samples have been fabricated in a rapid fashion utilizing the versatile technique of dynamic hydrogen bubble template (DHBT) method via potentiostatic electrodeposition over a copper substrate. The morphology of the samples is dendritic, with the composition being directly proportional to the deposition time. All the samples have been tested as SERS substrates for the detection of Rhodamine 6G (R6G) dye. The samples perform very well, with the best performance shown by the Pd samples. The lowest detectable R6G concentration was found to be 10−6 M (479 μgL−1) by one of the Pd samples with the deposition time of 180 s. The highest enhancement of signals noticed in this sample can be attributed to its morphology, which is more nanostructured compared to other samples, which is extremely conducive to the phenomenon of localized surface plasmon resonance (LSPR). Overall, these samples are cheaper, easy to prepare with a rapid fabrication method, and show appreciable SERS performance.

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“…Nanostructured metals and metal oxides possess enhanced surface area and augmented chemical and physical properties [ 35 , 36 ]. The main and easy route to obtain a nanostructured material starting from an alloy is the chemical or electrochemical etching conducted by means of aqueous media.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured Molybdenum Oxides from Aluminium-Based Intermetallic Compound: Synthesis and Application in Hydrogen Evolution Reaction

et al. 2021

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Characterized by a large surface area to volume ratio, nanostructured metal oxides possess unique chemical and physical properties with applications in electronics, catalysis, sensors, etc. In this study, Mo3Al8, an intermetallic compound, has been used as a precursor to obtain nanostructured molybdenum oxides. It was prepared into ribbons by arc-melting and melt-spinning techniques. Single and double-step free corrosion of the as-quenched material have been studied in 1 M KOH, 1 M HF and 1.25 M FeCl3 at room temperature. In both cases, nanostructured molybdenum oxides were obtained on a surface layer a few microns thick. Two of the as-prepared samples were tested for their electrocatalytic capability for hydrogen evolution reaction (HER) in 0.5 M H2SO4 giving low onset potential (−50 mV, −45 mV), small Tafel slopes (92 mV dec−1, 9 mV dec−1) and high exchange current densities (0.08 mA cm−2, 0.35 mA cm−2 respectively). The proposed nanostructured molybdenum oxides are cost-effective and sustainable due to the cheap and abundant starting material used and the simple synthetic route, paving the way for their possible application as HER electrocatalysts.

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Electrodeposited platinum on de-alloyed nanoporous gold with enhanced electro-catalytic performance

Cited by 21 publications

References 47 publications

Breaking Down SERS Detection Limit: Engineering of a Nanoporous Platform for High Sensing and Technology

Breaking Down SERS Detection Limit: Engineering of a Nanoporous Platform for High Sensing and Technology

Rapid Fabrication of Fe and Pd Thin Films as SERS-Active Substrates via Dynamic Hydrogen Bubble Template Method

Nanostructured Molybdenum Oxides from Aluminium-Based Intermetallic Compound: Synthesis and Application in Hydrogen Evolution Reaction

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