“Painted CNT”@Au nanoparticles: a nanohybrid electrocatalyst of direct methanol oxidation

Bensghaïer, Asma; Bhullar, Viplove; Kaur, Navdeep; Lo, Momath; Bdiri, Myriam; Mahajan, Aman; Chehimi, Mohamed M.

doi:10.1007/s42247-021-00207-4

Cited by 5 publications

(2 citation statements)

References 65 publications

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“…Figure 5 displays Au4f doublet with Au4f 7/2 peak centered at 84 eV, characteristic of gold in the metallic state. [ 58 ] The ratio of the peaks Au4f 7/2 and Au4f 5/2 is 4:3 which testifies that there are no other gold oxidation states.…”

Section: Resultsmentioning

confidence: 91%

Tuning arylation of gold nanoparticles for the electrocatalyzed oxidation of ethanol

Aghajani

Santoni

Mirzaei

et al. 2022

Applied Organom Chemis

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Alcohol oxidation is important for food industry and pharmaceuticals to name but a few. In this regard, precious metals such as gold operate in various shapes and sizes as effective catalysts for the oxidation of alcohols. In this work, 20-nm-sized gold nanoparticles (NPs) were synthesized and modified with either 4-carboxybenzenediazonium tetrafluoroborate (AB) (single-salt catalyst) or a mixture of the latter with 3,5-dimethylbenzenediazonium tetrafluoroborate (AB-DMB, double-salt catalyst). The relative concentrations of the diazonium salts were tuned in order to maintain the electrocatalytic property of the arylated gold NPs in the electro-oxidation of ethanol. The physicochemical properties (size, aryl layer thickness, and composition) and electrocatalytic performances of the capped gold NPs (in single-and double-salt catalyst systems) were investigated by means of TEM, XPS, UV-visible, TGA/DTA, and electrochemistry. The aryl capping layer thickness is below 1 nm when the total salt concentration was 5 Â 10 À5 M, without any significant loss of current compared with pure gold NPs. For 1 μl of pristine or arylated Au NPs, coated on 0.07 cm 2 glassy carbon electrode disk, we achieved a low oxidation potential of 200 mV and high current ethanol oxidation peak intensity leveling off at $80 μA for the single diazonium arylation. It is demonstrated that dilution of the carboxylic acid-functionalized diazonium is more important than mixing this compound with 3,5-dimethylbenzenediazonium salt at equal total concentration. The dual arylation strategy induced lower ethanol oxidation intensity likely due to hydrophic effect imparted by the 3,5-dimethylphenyl groups, thus hindering access of ethanol to the nanocatalyst surface. This work demonstrates that arylated gold NPs are unique nanocatalysts for ethanol oxidation reaction, with remarkable performances. This electrocatalytic performance of the NPs was maintained through the use of finely tuned aryl capping layer.The strategy opens avenues for other arylated electrocatalysts and uses thereof.

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Section: Resultsmentioning

confidence: 91%

Tuning arylation of gold nanoparticles for the electrocatalyzed oxidation of ethanol

Aghajani

Santoni

Mirzaei

et al. 2022

Applied Organom Chemis

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“…Diazonium salts can be used to improve the deposition of metal nanoparticles (NPs) with catalytic properties. In most cases, gold and silver NPs are used [ 8 , 13 , 32 , 33 , 34 , 35 ], yet there are no limits in the use of other metals, such as copper [ 12 , 36 ], rhodium [ 36 ], palladium [ 35 ], and ruthenium [ 12 ]. Diazonium salts are used for the modification of catalyst carriers for several reasons.…”

Section: Different Approaches To Catalyst Production Via Diazonium Sa...mentioning

confidence: 99%

Catalyst Design through Grafting of Diazonium Salts—A Critical Review on Catalyst Stability

Smołka,

Krukiewicz

2023

IJMS

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In the pursuit of designing a reusable catalyst with enhanced catalytic activity, recent studies indicate that electrochemical grafting of diazonium salts is an efficient method of forming heterogeneous catalysts. The aim of this review is to assess the industrial applicability of diazonium-based catalysts with particular emphasis on their mechanical, chemical, and thermal stability. To this end, different approaches to catalyst production via diazonium salt chemistry have been compared, including the immobilization of catalysts by a chemical reaction with a diazonium moiety, the direct use of diazonium salts and nanoparticles as catalysts, the use of diazonium layers to modulate wettability of a carrier, as well as the possibility of transforming the catalyst into the corresponding diazonium salt. After providing descriptions of the most suitable carriers, the most common deactivation routes of catalysts have been discussed. Although diazonium-based catalysts are expected to exhibit good stability owing to the covalent bond created between a catalyst and a post-diazonium layer, this review indicates the paucity of studies that experimentally verify this hypothesis. Therefore, use of diazonium salts appears a promising approach in catalysts formation if more research efforts can focus on assessing their stability and long-term catalytic performance.

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On the Use of Diazonium Salts in the Design of Catalytic Hybrid Materials and Coatings

Mousli

Snoussi

Chehimi

et al. 2022

Aryl Diazonium Salts and Related Compounds

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“Painted CNT”@Au nanoparticles: a nanohybrid electrocatalyst of direct methanol oxidation

Cited by 5 publications

References 65 publications

Tuning arylation of gold nanoparticles for the electrocatalyzed oxidation of ethanol

Tuning arylation of gold nanoparticles for the electrocatalyzed oxidation of ethanol

Catalyst Design through Grafting of Diazonium Salts—A Critical Review on Catalyst Stability

On the Use of Diazonium Salts in the Design of Catalytic Hybrid Materials and Coatings

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