Metal–organic framework composites as electrocatalysts for electrochemical sensing applications

Kempahanumakkagari, Sureshkumar; Vellingiri, Kowsalya; Deep, Akash; Kwon, Eilhann E.; Bolan, Nanthi; Kim, Ki‐Hyun

doi:10.1016/j.ccr.2017.11.028

Cited by 305 publications

(101 citation statements)

References 162 publications

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“…Also, as the pristine MOF presented in the composite is expected to act as the active material for electroanalysis, the chemical stability of the selected MOF in the composite during the electrochemical processes still needs to be considered. Several examples of composites composed of stable MOFs and conductive materials have been designed for electroanalytical purposes . For example, as a follow‐up study of the work depicted in Figure , nanocomposites consisting of the same Zr‐MOF, MOF‐525, and graphene nanoribbons were prepared for electroanalysis ; a significantly improved electrocatalytic activity toward nitrite was observed with the nanocomposites.…”

Section: Charge Transport In Mofsmentioning

confidence: 99%

Metal−Organic Frameworks toward Electrochemical Sensors: Challenges and Opportunities

2020

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Owing to their fascinating characteristics, metal−organic frameworks (MOFs) have attracted great attention and been utilized in a range of applications. The use of MOFs in electrochemical sensors has become an emerging subfield since 2013. However, the poor chemical stability in aqueous solutions and low electrical conductivity of most MOFs become two main concerns that hinder the use of pristine MOFs in electroanalytical systems. In this short review, we aim to focus on these issues and provide perspectives regarding the opportunities and possible strategies in future studies to overcome these challenges in order to design the MOF‐based electrochemical sensors.

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Section: Charge Transport In Mofsmentioning

confidence: 99%

Metal−Organic Frameworks toward Electrochemical Sensors: Challenges and Opportunities

2020

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“…Despite this, these simplified methods are ideal, as a minimum of hazardous residues are produced. Large-scale production of MOFs is required due to the wide number of fields in which they are employed, for instance, in photocatalysis [20], electrochemistry [21], as adsorbents [22], and in gas separation [23]. However, the key issue in view of their actual application is the stability of the MOF-based catalysts, in particular when liquid phase media are involved [24].…”

Section: Introductionmentioning

confidence: 99%

Direct Hydroxylation of Phenol to Dihydroxybenzenes by H2O2 and Fe-based Metal-Organic Framework Catalyst at Room Temperature

et al. 2020

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A semi-crystalline iron-based metal-organic framework (MOF), in particular Fe-BTC, that contained 20 wt.% Fe, was sustainably synthesized at room temperature and extensively characterized. Fe-BTC nanopowders could be used as an efficient heterogeneous catalyst for the synthesis of dihydroxybenzenes (DHBZ), from phenol with hydrogen peroxide (H2O2), as oxidant under organic solvent-free conditions. The influence of the reaction temperature, H2O2 concentration and catalyst dose were studied in the hydroxylation performance of phenol and MOF stability. Fe-BTC was active and stable (with negligible Fe leaching) at room conditions. By using intermittent dosing of H2O2, the catalytic performance resulted in a high DHBZ selectivity (65%) and yield (35%), higher than those obtained for other Fe-based MOFs that typically require reaction temperatures above 70 °C. The long-term experiments in a fixed-bed flow reactor demonstrated good Fe-BTC durability at the above conditions.

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“…[23,24] The use of many MOFs was extensively explored regarding its possible applications in water-based separations and chromatography, [25][26][27][28] provided that selected materials fulfill the crucial requisite of stability toward hydrolysis. [31][32][33][34][35][36][37] Based on the signal transduction possible for many configurations, sensors reported can be described as optical, [38,39] electrochemical, [40][41][42] mechanical, [43] photoelectrochemical, [44][45][46][47] or combined-miscellaneous. [30] The advantageous features of different MOFs have been rapidly applied in the development of sensors.…”

Section: Introductionmentioning

confidence: 99%

MOF@PEDOT Composite Films for Impedimetric Pesticide Sensors

et al. 2020

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Due to its deleterious effects on health, development of new methods for detection and removal of pesticide residues in primary and derived agricultural products is a research topic of great importance. Among them, imazalil (IMZ) is a widely used post‐harvest fungicide with good performances in general, and is particularly applied to prevent green mold in citrus fruits. In this work, a composite film for the impedimetric sensing of IMZ built from metal‐organic framework nanocrystallites homogeneously distributed on a conductive poly(3,4‐ethylene dioxythiophene) (PEDOT) layer is presented. The as‐synthetized thin films are produced via spin‐coating over poly(ethylene terephtalate (PET) substrate following a straightforward, cost‐effective, single‐step procedure. By means of impedance spectroscopy, electric transport properties of the films are studied, and high sensitivity towards IMZ concentration in the range of 15 ppb to 1 ppm is demonstrated (featuring 1.6 and 4.2 ppb limit of detection, when using signal modulus and phase, respectively). The sensing platform hereby presented could be used for the construction of portable, miniaturized, and ultrasensitive devices, suitable for pesticide detection in food, wastewater effluents, or the assessment of drinking‐water quality.

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Metal–organic framework composites as electrocatalysts for electrochemical sensing applications

Cited by 305 publications

References 162 publications

Metal−Organic Frameworks toward Electrochemical Sensors: Challenges and Opportunities

Metal−Organic Frameworks toward Electrochemical Sensors: Challenges and Opportunities

Direct Hydroxylation of Phenol to Dihydroxybenzenes by H2O2 and Fe-based Metal-Organic Framework Catalyst at Room Temperature

MOF@PEDOT Composite Films for Impedimetric Pesticide Sensors

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