A novel, effective and low cost catalyst for formaldehyde electrooxidation based on nickel ions dispersed onto chitosan-modified carbon paste electrode for fuel cell

Application of Synthesized NaA Nanozeolite as a Novel Supported Electrode for the Formaldehyde Electro‐catalytic Oxidation

“…A pair of well-shaped redox peaks with a peak to peak potential separation (ΔE p ) of 165 mV is detected at the scan rate of 0.01 V s -1 . The a can be calculated by measuring the variation of the peak potential (E p ) with respect to the t and k s can be determined for electron transfer between electrode and the surface layer by measuring the E p [3,13,14,47,48]. At ΔE p > 200/n mV according to a theory defined by Laviron, we can be calculated the electron-transfer coefficient (a), apparent charge-transfer rate constant (k s ) and scan rate (t).…”

“…A linear section is observed on plot of log j pa vs. log t for the oxidation of HCHO with slope of 0.3366 (see Figure 9d) which is close to the theoretically expected value of 0.5 for a purely diffusion-controlled current. A polynomial decrease in plot, defines an EC process and emphasize, that an irreversible follow-up chemical step is included in overall process [14,56]. To further realize the mechanism of process, a plot of scan rate normalized current intensity (j pa /t 1/2 ) vs. t is plotted (Figure 9e).…”

Formaldehyde Electro‐catalytic Oxidation onto Carbon Paste Electrode Modified by MIL‐101(Cr) Nanoparticles

“…The electro‐oxidation of CH 2 O is connected with technological improvement of direct methanol fuel cells (DMFCs). Also, the literature survey shows that significant interest has been focused in the electrochemical oxidation of formaldehyde since many years . Some materials have been applied for the electro‐oxidation of CH 2 O including Pt electrode , Pt‐MnO 2 , Pt nanoparticles/GCE , Cu electrode , Pd electrode , Cu‐Pd thin film , Cu/Pd modified carbon nanotube paste electrode , Pt–Pd/CNT , nickel hydroxide‐promoted Pt/Al 2 O 3 , Au nanoparticles and zeolite‐modified electrodes containing nickel hydroxide , , .…”

“…Some materials have been applied for the electro‐oxidation of CH 2 O including Pt electrode , Pt‐MnO 2 , Pt nanoparticles/GCE , Cu electrode , Pd electrode , Cu‐Pd thin film , Cu/Pd modified carbon nanotube paste electrode , Pt–Pd/CNT , nickel hydroxide‐promoted Pt/Al 2 O 3 , Au nanoparticles and zeolite‐modified electrodes containing nickel hydroxide , , . Nevertheless, some of these electrodes were found to suffer the problems of poor selectivity and low sensitivity produced by surface poisoning from the adsorbed intermediates . It is important to improve a novel electrode which has high sensitivity and stability for the electro‐oxidation of CH 2 O.…”

Binding Ni(II) ions to chitosan and its N-heterocyclic derivatives: Density functional theory investigation

“…A majority of studies on complexation mechanism were focused on coordination of Cu(II), but some experimental and theoretical studies were performed for other metal ions [10,12,17,20]. Coordination of Ni 2+ ions by chitosan have not yet been extensively investigated, although functional chitosan-based materials containing nickel are currently of high interest in numerous applied fields, e.g., catalysis [23], protein separation [24], and selective sorption [25].…”