Silver nanospheres (AgNS) with SPR band ∼417 nm was synthesized by Green synthesis, using a pre‐hydrolysed liquor (PHL) of Nilgiri wood without any pretreatment. The synthesis was carried out at room temperature and was complete within three hours. The reduction and stabilization of silver is brought about by hemicelluloses present in the pre‐hydrolysed liquor. Electrochemical oxidation of nitrite on glassy carbon electrode (GCE) modified with the AgNS in 0.1 M phosphate buffer solution (PBS) of pH 7.0 was found to occur at 0.86 V with respect to Ag/AgCl. Electrochemical sensing experiments with AgNS/GCE showed a linear range of detection between 0.1 to 8 μM, with detection limit of 0.031 μM and a sensitivity of 580 μA mM−1cm−2.
Polyaniline film was prepared by using the repeated potential cycling technique in an acidic solution at the surface of glassy carbon electrode. Then transition metal ions of Ni and Cu were incorporated to the polymer by immersion of the modified electrode. A comparative study of the electrocatalytic oxidation of methanol is made in NaOH, on Ni and Cu on polyaniline film covered glassy carbon electrode (Ni-PANI-GC, Cu-PANI-GC) at 25˚C. Catalytic activity for the oxidation of methanol was studied by using cyclic voltammetry.
The preparation of advanced nanomaterials with unique functions from the bio-renewable (natural resources) materials is considered as one of the environmentally friendly and cost effective approaches. In this report, we demonstrate on the synthesis of carbon nanospheres with tunable diameters (30-40 nm) and controlled morphology with a pore size ∼2.0 nm from biorenewable carbon rich Areca nut and their applications in the electrochemical sensing of nitrite. The obtained carbon nanospehres exhibit good linear range (0.2 to 400 μM) for electrocatalytic oxidation of nitrite, are able to detect low levels of nitrite with high sensitivity (28.91 mA/ μM/cm 2 ) and are found to have better sensing capability than other porous carbon based electrocatalysts. This excellent electrocatalytic performance of carbon nanospheres toward oxidation of nitrite may be arising from synergistic effect between its high porosity, surface area and the catalytic effect of the carbon surface due to the presence of surface functional groups. The carbon nanosphere based sensor is also succesfully used for the real time sensing of nitrite from sea and lake water.
a b s t r a c tElectrocatalytic activity of the Pt microparticles dispersed into polyindole (PIn) films obtained by electropolymerization on carbon paste electrodes (CPE) towards methanol oxidation in perchloric acid medium has been demonstrated and investigated using cyclic voltammetry, potentiodynamic polarization, chronoamperometry and impedance spectroscopic techniques. The results show that PIn films obtained on these electrodes serve as good host matrices for the dispersion of Pt microparticles and exhibit good catalytic activity towards the electrooxidation of methanol compared to bulk Pt and CPE modified with Pt. The morphology and composition of the modified and unmodified films were obtained using SEM and EDX techniques. The effect of scan rate, amount of Pt and concentration of methanol, on the activity of the electrode has been tested. The effect of alloying Pt with different amounts of Ni was studied and it was found that when the metals are deposited from a solution containing the metal salts in 1:1 ratio the activity towards methanol oxidation was significantly enhanced.
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