An iridium-decorated metal–organic framework for electrocatalytic oxidation of nitrite

Electrochemistry Communications

卷:122

Chung-Wei Kung¹  Tzu-En Chang²  Cheng-Hsun Chuang² 

[1] Corresponding author at: Department of Chemical Engineering, National Cheng Kung University, 1 University Road, Tainan City 70101, Taiwan.;

[2] Department of Chemical Engineering, National Cheng Kung University, Tainan City 70101, Taiwan;

关键词: Amperometric detection;    Electrocatalysis;    Electrochemical sensor;    Redox hopping;    Zirconium-based MOF;   

DOI  :  

来源: DOAJ

【 摘 要 】

Spatially dispersed redox-active iridium sites are immobilized throughout the porous framework of a zirconium-based metal–organic framework (MOF), UiO-66, to enable charge hopping in the MOF. The resulting iridium sites within UiO-66 not only permit redox hopping-based electron transport within the MOF in aqueous electrolytes, but also exhibit electrocatalytic activity for the oxidation of nitrite. The pH of the electrolyte for this electrocatalysis is optimized, and the electrocatalytic mechanism occurring on the Ir-decorated UiO-66 thin films is investigated. The material is further applied for amperometric nitrite sensing in aqueous solutions. Owing to its high porosity, the Ir-decorated UiO-66 achieves a good sensitivity (168.8 μA/mM-cm2) for detecting nitrite with a low limit of detection (0.41 μM).

【 授权许可】

Unknown