Electrocatalytic Performance of Nickel Hydroxide-Decorated Microporous Nanozeolite Beta-Modified Carbon Paste Electrode for Formaldehyde Oxidation

Abstract

In this paper, aluminosilicate nanozeolite beta has been prepared and completely described using X-ray diffraction (XRD), nitrogen sorption isotherm, Fourier transform infrared (FT-IR), transmission electron micrograph (TEM) and eld emission scanning electronic microscopy (FESEM) techniques. TEM image of synthesized nanozeolite demonstrates semispherical particles with a uniform morphology and dimensions under 50 nm. The BET surface area, total pore volume and pore diameter of it were attained to be 321 m 2 g − 1 , 0.053 cm 3 g − 1 and 1.22 nm, respectively. The modi ed carbon paste electrode by aluminosilicate nanozeolite beta and nickel hydroxide (Ni(OH) 2 -Beta/CPE) was applied for formaldehyde (HCHO) electro-catalytic oxidation in the alkaline media. The obtained results specify that Ni(OH) 2 -Beta/CPE demonstrates worthy electro-catalytic activity for oxidation of HCHO due to mesoporous construction and the great surface area of nanozeolite beta. The electron-transfer coe cient, catalytic rate constant and diffusion coe cient are found to be 0.69, 2.08×10 6 cm 3 mol − 1 s − 1 and 4.4×10 − 7 cm 2 s − 1 , respectively. The Ni(OH) 2 -Beta/CPE exhibited good reproducibility and stability and it has low price, low background current, simplicity of surface renewal. This modi ed electrode has better poisoning tolerance capability than bare CPE for HCHO electro-catalytic oxidation and is a higher device for the long term accomplishment.

A new method for the preparation of MgAl layered double hydroxide-copper metal–organic frameworks structures: application to electrocatalytic oxidation of formaldehyde

“…From the Eq. ( 9 ) and assuming one electron transfer in rate-determining step, n α = 1, a charge transfer coefficient (α) of the FA oxidation was calculated as 0.61 82 :

Figure 9 Cyclic voltammograms of the Cu-(PTA) MOFs/MgAl-LDH/CPE in 0.1 M NaOH containing 66 mM of FA at different scan rate (10–250 mV s -1 ). Inset ( a ): Plot of anodic peak currents with square root of scan rate, υ. Inset ( b ) the plot of E p vs. Log υ. Inset ( c ) the Tafel plot for FA oxidation at the same electrode from the CV at a scan rate of 5 mV s -1 .

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“…On the other hand, the catalytic rate constant (k cat ), for the electrooxidation reaction of FA at Cu-(PTA) MOFs/MgAl-LDH was obtained according to the Galus method and Eq. ( 10 ) 75 , 82 , 83 : where I cat and I L are the currents at the modified electrode in the presence and absence of FA, respectively, and γ = kC o t [C o is the bulk concentration of FA (mol cm -3 )], k cat catalytic rate constant (cm 3 mol -1 s -1 ) and t is the time elapsed (s). Based on the plot of the slopes of the straight lines against the FA concentration (inset b of Fig.…”

Fabrication and Characterization of an Electrochemical Platform for Formaldehyde Oxidation, Based on Glassy Carbon Modified with Multi-Walled Carbon Nanotubes and Electrochemically Generated Palladium Nanoparticles

“…The increase in the anodic current observed from a potential of approximately +0.6 V corresponds to the oxidation of PdNPs. The electrooxidation process of Pd is intricate and can manifest through diverse pathways [14,15]. Principally, this process involves the passivation of Pd, leading to the formation of Pd(II) oxide (PdO).…”

“…Various electrochemical platforms, employing metals such as platinum, rhodium, nickel, and palladium as key components, have been utilized for the study of formaldehyde electrooxidation and detection [1,[8][9][10][11][12][13][14][15][16][17][18][19][20]. Pd is particularly intriguing due to its distinctive physicochemical properties, especially its electrochemical attributes, ascribed to weak intermetallic bonds within the crystal lattice [21].…”