Palladium-polypyrrole composites as prospective catalysts for formaldehyde electrooxidation in alkaline solutions

Electrochemical operational principles and analytical performance of Pd-based amperometric nanobiosensors

“…23 The increase of the anodic current in the range of 0.4-0.7 V corresponded to oxygen adsorption (Pd x O y formation). 29 At the same time, the presence of enzymes (evaluated as a co-factor, i.e. flavin adenine dinucleotide, FAD) in the structure of the one-step designed Pd-NPs-based nanobiosensors and the efficiency of the performed co-deposition procedure was confirmed by LDI-MS, Fig.…”

“…H 2 O 2 is an electroactive species which can be reduced or oxidized on the electrode surface depending on the used polar-ization mode. 29 The electrochemical response of the one-step nanobiosensors was recorded in CV mode on the one-channel biologic Potentiostat PalmSens4 (PalmSens, Utrecht, The Netherlands). The CV curves were obtained by placing a 150 µL droplet of pure phosphate buffer or targeted bioanalyte over all three electrodes.…”

“…To verify the impact of palladium oxides 29 on the electrochemical read-out supplied by Pd-NPs, CV studies were conducted for the Pd-NPs-modified GCE under an Ar-atmosphere in the absence of O 2 and in the presence of oxygen at different anodic limits, Fig. S6.…”

“…This means that the presence of molecular oxygen and extension of the anodic polarization limit facilitate palladium oxide formation resulting in the increase of oxygen electroreduction during the backward scan. 29 It is important to mention that the cathodic peak is increased in the presence of dissolved oxygen due to the ORR.…”

Flow Injection Amperometric Measurement of Formalin in Seafood

“…The concentration of NaOH was an important factor affecting the electrocatalytic behavior of formalin at the PdPs-CMs/GCE since it caused the formation of the active intermediate of methylene glycol and the Pd–O that catalyzed formalin oxidation. 43 The effect of NaOH concentration on the sensitivity of response was studied at 0.005, 0.01, 0.05, 0.10, and 0.50 mol L –1 . The current response demonstrated the highest sensitivity at 0.05 mol L –1 ( Figure 5 C).…”