Glucose electrooxidation on carbon supported NiAu electrocatalysts - Archive ouverte HAL
Article Dans Une Revue Electrochimica Acta Année : 2025

Glucose electrooxidation on carbon supported NiAu electrocatalysts

Résumé

NiAu/C nanomaterials are synthesised using a wet chemistry method with targeted Au atomic ratios of 10%, 20% and 30%. Physicochemical characterisations indicate that the materials have mean compositions close to the nominal ones but ca. 20 at% Au richer in average than expected (Au ratios of 13.6 at%, 23.1 at% and 35.9 at%, respectively). The NiAu/C materials are composed of Au-rich spherical-like Janus particles of several tenths nm and of a phase of very small Ni-rich nanoparticles and Ni(OH2) clusters. The electrochemical measurements in a 0.1 M NaOH/0.1 M glucose electrolyte indicate that the NiAu20/C catalyst is the most active for the glucose oxidation reaction, leading to a mass activity at +0.6 V vs RHE >1.5 times higher than that with a pure Au/C catalyst, although the Au content is almost 5 times lower. The chronoamperometry measurements for 900 s at +0.6 V vs RHE confirm the activity gain with the NiAu20/C catalyst. The electrolysis measurement at a cell voltage of + 0.6 V for 6 h shows that the NiAu20/C catalyst is selective towards the production of gluconic acid, with a faradaic efficiency higher than 100%, indicating the occurrence of a 1-electron reaction with anodic hydrogen coproduction. At +0.8 V, the faradaic efficiency is lower than 100%, indicating the formation of other products than gluconic acid, but at a very low extent (not detectable by HPLC) guarantying a very high selectivity towards gluconic acid.

Domaines

Matériaux Autre
Fichier principal
Vignette du fichier
Glucose electrooxidation on carbon supported NiAu electrocatalysts.pdf (6.35 Mo) Télécharger le fichier
Origine Publication financée par une institution
Licence

Dates et versions

hal-04814313 , version 1 (02-12-2024)

Licence

Identifiants

Citer

Weliton Silva Fonseca, Thibault C Rafaïdeen, Hamza Kahri, Têko W. Napporn, Christophe Coutanceau. Glucose electrooxidation on carbon supported NiAu electrocatalysts. Electrochimica Acta, 2025, 510, pp.145367. ⟨10.1016/j.electacta.2024.145367⟩. ⟨hal-04814313⟩
0 Consultations
0 Téléchargements

Altmetric

Partager

More