A novel nanoporous palladium catalyst for formaldehyde electro-oxidation in alkaline media

Abstract

In this work palladium nanoparticles (nanoPd) were successfully fabricated using a hydrothermal method from the solution of PdCl 2 + EDTA + HCHO. SEM image of the nanoPd exhibits a novel three-dimensional porous texture, presenting high stability and significantly large real surface area. Electrocatalytic activity of the nanoPd towards formaldehyde oxidation in alkaline media was evaluated by cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS). Electrooxidation of formaldehyde on the nanoPd electrode takes place at a low onset potential of ca. -0.85 V (vs SCE) and large anodic current densities. Chronoamperometric data of the nanoPd electrode shows high and stable anodic currents for formaldehyde oxidation. It was also observed that the steady-state current density shows a well linear increment with formaldehyde concentration in the range of 0 to 20 mM formaldehyde. EIS investigation at different formaldehyde concentrations presents very low values of charge transfer resistances for formaldehyde oxidation on the nanoPd. Results show that prepared nanoPd electrode is a highly efficient catalyst for formaldehyde oxidation in alkaline media.

Universal Electrode Interface for Electrocatalytic Oxidation of Liquid Fuels

“…The peak potentials for the oxidation of formaldehyde (Figure d) are at −0.24 V in the forward scan and at −0.34 V in the reverse scan. The oxidation current in the forward scan is due to the oxidation of formaldehyde into formic acid, which is further oxidized into carbon di/mono-oxide, contributing to the oxidation current in the reverse scan. − The ratio of ( I p,f / I p,r ) formaldehyde and Q formaldehyde were estimated to be 0.93 and 18.4 μC, respectively. Control experiments show that no oxidation of those four liquid fuels was realized on either a bare glassy carbon electrode or the CNTs coated electrode.…”

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

“…Literature review exhibits that important attention has been engrossed in the electro-oxidation of HCHO for many years [4,[7][8][9][10][11]. Various components have been used for the HCHO electro-oxidation containing Pd electrode [12], Pt nanoparticles/GCE [13], Pt electrode [14], Pt-MnO 2 [15], Cu electrode [6], Cu-Pd [3], Cu/Pd/MWCNTs/CPE [16], Pt-Pd/CNT [17], Au nanoparticles [18], rGO/ZnO composite [19], nickel phosphate/GCE [5], Ni-Pd/GCE [20], nickel phosphate/carbon composite [21], Ni thin lm on SiO 2 /Au [22], Ni(OH) 2 -Pt/Al 2 O 3 [23], Ni(OH) 2 -MIL/CPE [24] and zeolite-modi ed electrodes containing Ni(OH) 2 [25][26][27][28][29][30].…”

Tunable formaldehyde sensing properties of palladium cluster decorated graphene

“…10,11 These materials have caught great scientic and technological interests. [12][13][14][15] Recently, the graphene sheets functionalized with metal nanoparticles had shown to increase the selectivity, sensitivity, limit of detection, response, or an unio of these performances. [16][17][18][19] Gutés et al 16 exploited an simple and easy-to-implement method of electroless deposition of Au nanoparticles to fabricate Au-decorated graphene sensor for H 2 S detecting in relatively fast response.…”

“…It had demonstrated that palladium nanoparticles could be the very effective oxidation catalysts and electrochemical sensors for formaldehyde. 12,13,[20][21][22][23] The formaldehyde detecting properties of single-walled carbon nanotube hybridized with Pd were investigated by density-functional theory calculations. 22 These researches indicated that metal nanoparticles decorated graphene shows a great potential for applying to the gas sensing and catalysis.…”