Electrocatalytic Oxidation of Formaldehyde on Copper Oxide Nano‐crystalline Modified Glassy Carbon Electrode

Abstract

This research found a cheap and efficient catalyst for electrooxidation of formaldehyde (HCHO). A CuO nano-crystalline modified glassy carbon electrode (GCE) was fabricated and had an excellent electrocatalytic activity towards the oxidation of HCHO. Both the effect of potential scan rate and the effect of HCHO concentration on the electrocatalytic oxidation performance of the electrode were investigated. The amperometric current response of the electrode was proportional to HCHO concentration in the range of 1.0 µmol•L -1 -10.0 mmol•L -1 with a detection limit (s/n＝3) of 0.25 µmol•L -1 . The electrode was stable, showing the CuO nano-crystlline is promising for applications in fuel cells and electrochemical sensors.

Green Synthesized Cobalt Nano Particles for using as a Good Candidate for Sensing Organic Compounds

“…In the cases where ã>1.5, erf (ã 1/2 ) is almost equal to unity and the above equation can be reduced to [25]: (2) From the slope of the I C /I L versus t 1/2 plot, presented in Fig. 6 (left), the mean value of k for the concentration range of 0.1 to 0.5 M of AA was obtained as 1.…”

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

“…Ni-CoVSB-5/CPE a 1.80 10 5 -- [3] Ni/IL/CPE b 1.58 10 6 -- [13] Ni(OH) 2 /POT(TX-100)/CNTPE c 1.1 10 5 -- [15] Ni/P(NMA)/MCPE d 8.96 10 4 -- [16] Ni/ANA/CPE e 7.56 10 4 -- [17] Ni-P/CPE f 1.7 10 4 20-11,500 5.8 [18] Ni(OH) 2 -X/CPE g 6.1 10 4 -- [19] Pd NW/GCE h -2-1,000 0.5 [65] Pd-CPE -33-3,300 17 [66] Ag-Pd/Ch-IL/GCE k -60-20,000 22 [67] Pt-Pd/Nafion/GCE -10-1,000 3 [68] CuO/GCE 2.5 10 7 1-10,000 0.25 [69] Ni/P(1,5-DAN)/MCPE l 2 10 6 -- [70] Ni-HTN/CPE m 2.65 10 4 -- [71] Ni(OH) 2 -NaA/CPE n 8. HCHO concentration is depicted in Figure 12b that consisted of two linear segments in the concentration ranges of 0.006 to 0.072mM and 0.072 to 0.231mM, respectively.…”

Portable Flow Injection Amperometric Sensor Consisting of Pd Nanochains, Graphene Nanoflakes, and WS2 Nanosheets for Formaldehyde Detection

“…The nonenzymatic oxidation of FA at electrodes has been achieved by the use of metal nanocatalysts, which enable a simple electrode modification and provide good precision, fast response, and high stability. ,, Over the past decade, noble metal nanoparticles have been widely applied as electrocatalytic materials in electrochemical sensors and other electrochemical fields. These materials have included various pristine metals and composite materials comprising nickel, , copper − gold (Au), , platinum (Pt), , and palladium (Pd). − Among these noble metal nanoparticles, using Pd and/or Pd alloys-based electrodes in electrochemical FA sensing provides more advantages than the other mentioned materials. Some noble metal nanoparticles, such as nanostructured nickel or copper-based electrodes, are less expensive than Pd and/or its alloys.…”

“…However, Pd-based electrochemical sensors have more advantages than the other materials because they have higher electrocatalytic activity, are more stable, and can tolerate carbon monoxide (CO), which is a coproduct of the oxidation of FA. , Importantly, Pd-based electrodes can enable the electrocatalytic oxidation of FA at a low potential (<0.15 V). ,− Because most oxidizing agents found in food oxidize at relatively higher potentials, an electrochemical sensor with a low applied potential will be more selective toward FA. In contrast, electrodes modified with less expensive materials such as nickel, , and copper − must operate at >0.4 V to enable the electrocatalytic oxidation of FA. Interference from other oxidizing agents is usually an issue at this potential.…”