Facile synthesis of 3D flower-like Pt nanostructures on polypyrrole nanowire matrix for enhanced methanol oxidation

Mazzotta, Elisabetta; Caroli, Antonio; Pennetta, Antonio; Benedetto, Giuseppe E. De; Primiceri, Elisabetta; Monteduro, Anna Grazia; Maruccio, Giuseppe; Malitesta, Cosimino

doi:10.1039/c7ra13269g

Cited by 12 publications

(5 citation statements)

References 36 publications

(77 reference statements)

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“…Creating micro-nano-roughness on the electrode surface and depositing nano-materials on the WE are some of the common strategies to enhance the ECSA of the WE. 18,19 Hsu et al roughened the Si substrate by etching silicon nanowires, which were then coated with gold for enzymatic glucose sensing. 20 Using this approach, the ECSA was 6.12 times higher as compared to planar gold electrodes.…”

Section: Introductionmentioning

confidence: 99%

A natural fibre based sustainable and high-performance platform for electrochemical sensors

Gokhale,

Rao Vusa,

Panda

2024

RSC Sustain.

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Section: Introductionmentioning

confidence: 99%

A natural fibre based sustainable and high-performance platform for electrochemical sensors

Gokhale,

Rao Vusa,

Panda

2024

RSC Sustain.

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“…3 Besides possessing high tolerance to CO and activity towards O-H and C-H bond cleavage, electrocatalysts designed for oxidizing alcohols with two or more carbon atoms (C2+) must also be able to efficiently cleave C-C bonds, which is necessary for complete conversion to CO2. 4 To address the CO poisoning issue, researchers have explored different catalyst geometries, 5,6 co-operative catalyst schemes, 7,8 and alternative support materials 9 that are capable of decreasing the CO bond strength of active sites, and ease its removal at lower potentials. Some progress has also been made in the development of electrocatalysts for the oxidation of C2+ alcohols like ethanol, 10,11 mainly through the use of Rh-based alloys that can facilitate C-C bond scission.…”

Section: Introductionmentioning

confidence: 99%

Trends in C1-C4 Alcohol Oxidation Activity Enhancement for Tunable Silicon Oxide Encapsulated Platinum Electrocatalysts

Beatty,

Herring,

Llewellyn

et al. 2024

Preprint

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Electrooxidation of carbon monoxide (CO) and small oxygenate molecules is of great interest for direct alcohol fuel cell (DAFC) and electroorganic synthesis. Herein, we demonstrate that carbon-modified silicon oxide (SiOxCy) overlayers with nanoscopic thickness can greatly enhance the activity of Pt electrodes towards the oxidation of CO and five different oxygenate molecules. Trends in activity are reported with respect to the composition and structure of the SiOxCy overlayers, revealing that low-density, carbon-rich overlayers enhance peak current densities towards the oxidation of formic acid, methanol, ethanol, 1-propanol, and 1-butanol by 370%, 290%, 190%, 130%, and 30%, respectively, compared to bare Pt controls. Unlike conventional alloy electrocatalysts, the alcohol oxidation activity of SiOxCy|Pt electrodes did not strongly correlate with their ability to oxidize CO intermediates, suggesting that that C-H bond scission and/or oxidation of aldehyde or carboxylic acid intermediates, rather than CO intermediates, are the rate limiting steps during the oxidation of C1 and C2 alcohols. For larger alcohols like propanol and butanol, oxidation activity on encapsulated electrodes diminishes relative to bare Pt, which is attributed to mass transport limitations introduced by the overlayer. Overall, the structure-property-performance relationships uncovered in this study provide new insights into how overlayers can alter reaction mechanisms and can be used to guide design of encapsulated catalysts for alcohol oxidation and electroorganic synthesis reactions.

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“…When used in electrocatalytic field, the performances of Pt nanozymes are strongly influenced by three main parameters, namely size/shape, coating, and surface properties [ 18 – 26 ]. While sizes in the range of few nanometers are necessary to mimic natural enzyme specificity and improve performance [ 27 – 30 ], shapes regulate the surface structure, i.e., the arrangement of the atoms at the surface [ 31 ] which has been demonstrated to strongly determine the surface properties of nanosized Pt in several applications including glucose oxidation [ 32 , 33 ]. As for the coating layer effect on Pt-based nanocatalysts, it has been reported that the surface coating can deteriorate the enzymatic properties of nanomaterials, posing a focus on nanoparticle synthetic protocols and subsequent modification [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Nanozymes based on octahedral platinum nanocrystals with {111} surface facets: glucose oxidase mimicking activity in electrochemical sensors

Mazzotta,

Di Giulio,

Mastronardi

et al. 2023

Microchim Acta

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The ability of shape-controlled octahedral Pt nanoparticles to act as nanozyme mimicking glucose oxidase enzyme is reported. Extended {111} particle surface facets coupled with a size comparable to natural enzymes and easy-to-remove citrate coating give high affinity for glucose, comparable to the enzyme as proven by the steady-state kinetics of glucose electrooxidation. The easy and thorough removal of the citrate coating, demonstrated by X-ray photoelectron spectroscopy analysis, allows a highly stable deposition of the nanozymes on the electrode. The glucose electrochemical detection (at −0.2 V vs SCE) shows a linear response between 0.36 and 17 mM with a limit of detection of 110 μM. A good reproducibility has been achieved, with an average relative standard deviation (RSD) value of 9.1% (n = 3). Similarly, a low intra-sensor variability has been observed, with a RSD of 6.6% (n = 3). Moreover, the sensor shows a long-term stability with reproducible performances for at least 2 months (RSD: 7.8%). Tests in saliva samples show the applicability of Pt nanozymes to commercial systems for non-invasive monitoring of hyperglycemia in saliva, with recoveries ranging from 92 to 98%. Graphical Abstract

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Facile synthesis of 3D flower-like Pt nanostructures on polypyrrole nanowire matrix for enhanced methanol oxidation

Abstract: Platinum nanoflowers on polymer nanowires exhibit catalytic properties ascribed to the effect of high surface area flower-like structures and polymer 3D structure.

Cited by 12 publications

References 36 publications

A natural fibre based sustainable and high-performance platform for electrochemical sensors

A natural fibre based sustainable and high-performance platform for electrochemical sensors

Trends in C1-C4 Alcohol Oxidation Activity Enhancement for Tunable Silicon Oxide Encapsulated Platinum Electrocatalysts

Nanozymes based on octahedral platinum nanocrystals with {111} surface facets: glucose oxidase mimicking activity in electrochemical sensors

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