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Formaldehyde Electro‐catalytic Oxidation onto Carbon Paste Electrode Modified by MIL‐101(Cr) Nanoparticles
Author(s) -
Gheytani S.,
HassaninejadDarzi S. K.,
Taherimehr M.
Publication year - 2020
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201800161
Subject(s) - materials science , catalysis , specific surface area , nanoparticle , carbon paste electrode , adsorption , formaldehyde , analytical chemistry (journal) , bet theory , scanning electron microscope , electrode , particle size , electrochemistry , chemical engineering , nuclear chemistry , cyclic voltammetry , nanotechnology , chemistry , composite material , organic chemistry , engineering
In this paper, MIL‐101(Cr) metal‐organic framework (MOF) has been rapidly synthesized via microwave heating and fully characterized using powder X‐ray diffraction (PXRD), field emission scanning electronic microscopy (FESEM), Fourier transform infrared (FT‐IR) and nitrogen adsorption/desorption isotherm. FESEM image of MIL‐101(Cr) MOF displays spherical particles with a uniform morphology and particle size under 100 nm. The BET surface area and average pore diameter of synthesized MIL‐101(Cr) MOF were obtained to be 7.266 × 10 2 m 2 g −1 and 3.28 nm, respectively. Nickel hydroxide dispersed onto MIL‐101(Cr) nanoparticles modified carbon paste electrode (Ni(OH) 2 ‐MIL/CPE) was employed for electro‐catalytic oxidation of formaldehyde (CH 2 O) in the alkaline medium. The mean value of electron‐transfer coefficient, charge‐transfer rate constant and surface coverage of the Ni(OH) 2 ‐MIL/CPE are found to be 0.517, 0.0058 s −1 and 7.88 × 10 −8 mol cm −2 , respectively. Also, the mean value of catalytic rate constant and diffusion coefficient of CH 2 O in the modified electrode surface are calculated to be 2.37 × 10 2 cm 3 mol −1 s −1 and 1.288 × 10 −6 cm 2 s −1 , respectively. The results indicate that Ni(OH) 2 ‐MIL/CPE displays good electrocatalytic activity to the CH 2 O oxidation owing to porous structure and the large surface area of MIL‐101(Cr) MOF.