Porphyrin-based metal–organic framework thin films for electrochemical nitrite detection

• Published in: Electrochemistry communications 2015-09, Vol.58 (C), p.51-56
• Main Authors: Kung, Chung-Wei, Chang, Ting-Hsiang, Chou, Li-Yao, Hupp, Joseph T., Farha, Omar K., Ho, Kuo-Chuan
• Format: Article
• Language: English
• Subjects: Electroactive metal–organic frameworks; Electrocatalysis; Electrochemical sensor; Solvothermal growth; Zirconium node
• ISSN: 1388-2481; 1873-1902
• DOI: 10.1016/j.elecom.2015.06.003

Uniform zirconium-based porphyrin metal–organic framework (MOF-525) thin films are grown on conducting glass substrates by using a solvothermal approach. The obtained MOF-525 thin film is electrochemically addressable in aqueous solution and shows electrocatalytic activity for nitrite oxidation. The mechanism for the electrocatalytic oxidation of nitrite at the MOF-525 thin film is investigated by cyclic voltammetry. The redox mechanism of the MOF-525 thin film in the KCl aqueous solution is studied by amperometry. The MOF-525 thin film is deployed as an amperometric nitrite sensor. The linear range, sensitivity, and limit of detection are 20–800μM, 95μA/mM-cm2, and 2.1μM, respectively. [Display omitted] •Zirconium-based porphyrin MOF thin films are grown on conducting substrates.•The MOF-525 thin film shows electrocatalytic activity for nitrite oxidation.•Redox and electrocatalytic mechanisms of the MOF thin film are investigated.•The amperometric nitrite sensor using MOF-525 thin film is successfully developed.