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

Abstract

Porphyrin-based metal-organic framework thin films for electrochemical nitrite detection, Electrochemistry Communications (2015), AbstractUniform zirconium-based porphyrin metal-organic framework 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 20-800 μM, 95 μA/mM-cm 2 , and 2.1 μM, respectively.

New application for the BiVO4 photoanode: A photoelectroanalytical sensor for nitrite

“…Based on this information, the detection limit obtained by the BiVO 4 /FTO photoelectrochemical sensor is low enough for determination of nitrite ions in drinking water, proving that this electrochemical device is suitable to be used in environmental analysis. The LOD value achieved by BiVO 4 /FTO photoelectrochemical sensor was lower than results obtained by the use of direct electrochemical sensor for nitrite published recently using carbon paste electrode decorated with silver particles (3.0 μmol L -1 ) [30], and zirconium-based porphyrin metal-organic framework (2.1 μmol L -1 ) [38]. A LOD of 0.4 μmol L -1 was observed in bare glassy carbon electrode using chronoamperometry but LOD increased to 300 μmol L -1 employing cyclic voltammetry [37].…”

Theoretical Investigation of Charge Transfer in Metal Organic Frameworks for Electrochemical Device Applications

“…40 Similarly, structural dynamics may also influence the charge transfer process. charge transfer integral t 2 (θ)/t 2 (0°)= χ 4 (θ)/χ 4 (0°) (blue) 0° corresponds to the 54.9° equilibrium geometry in the gas phase.…”

“…polymorphs NU-901 and NU-1000, exhibit high porosity, chemical stability and conductivity, simultaneously, making these suitable for electrochemical device applications. 8,18,[38][39][40] Depending on the application, additional material requirements besides charge transport include energy transport, [41][42][43] optical response [44][45][46] and catalytic activity. 13 The catalytic activity of MOFs has been studied for a variety of reactions, including oxidation, hydrogenation and condensation reactions.…”

Inkjet-printed porphyrinic metal–organic framework thin films for electrocatalysis

“…Among various MOFs, porphyrinic MOFs, which are constructed from porphyrinic or metalloporphyrinic linkers, have been widely reported [36][37][38] . Due to the redox activity of their porphyrinic or metalloporphyrinic units, porphyrinic MOFs have been proposed as an attractive candidate for various electrochemical applications including CO 2 reduction, 22, 39 reduction of carbon tetrachloride, 30 and electrochemical nitrite sensor 40 in a few recent studies. Among those applications, detection of nitrite by MOF shows great promise in improving the accuracy.…”

“…Porphyrin MOFs provide ultrahigh surface areas with vast electrocatalytic sites for nitrite oxidation reaction, and can be to further improve the sensitivity and detection limits for nitrite sensing. 40 In a recent study, the nanocrystals of a water-stable zirconium-based porphyrinic MOF, MOF-525, have been successfully synthesized and found to be well dispersible. 41 Thus, the suspensions of MOF-525 may be a terrific choice as the inks for fabricating electrochemically addressable MOF thin films via inkjet printing technology for nitrite sensing.…”