Fabrication of CuO/Cu/TiO2 nanotube arrays modified electrode for detection of formaldehyde

In Situ Reduction of a CuO/ZnO/CeO2/ZrO2 Catalyst Washcoat Supported on Al2O3 Foam Ceramic by Glycerol for Methanol Steam Reforming in a Microreactor

“…Figure compares the X-ray photoelectron spectroscopy (XPS) spectra of synthesized catalysts. The peaks of the Cu 2p orbit of GC0.25 and GC0.5, as shown in Figure a, were divided into peaks for Cu 0/+ (931.8 and 951.6 eV) and Cu 2+ (932.9 and 952.8 eV), while the satellite peaks were ascribed to Cu 2+ . The absence of satellite peaks for Cu 2+ in GC1 and GC2 demonstrated that the Cu species was in zero valence.…”

“…The peaks of the Cu 2p orbit of GC0.25 and GC0.5, as shown in Figure 6a, were divided into peaks for Cu 0/+ (931.8 and 951.6 eV) and Cu 2+ (932.9 and 952.8 eV), while the satellite peaks were ascribed to Cu 2+ . 32 The absence of satellite peaks for Cu 2+ in GC1 and GC2 demonstrated that the Cu species was in zero valence. Therefore, the concentration of Cu 0/+ and Cu 2+ of the synthesized catalyst could be calculated, and the results are shown in Table 2.…”

Interfacial engineering by creating Cu-based ternary heterostructures on C3N4 tubes towards enhanced photocatalytic oxidative coupling of benzylamines

“…36 Another pair of peaks at 934.2 eV and 954.6 eV are attributed to metallic Cu 0 or Cu 2+ . 37 According to XRD characterization, there are characteristic peaks of Cu and no characteristic peaks of Cu 2+ are found. Therefore, these two peaks are Cu, while the peak of Cu + belongs to Cu 2 O in the catalyst.…”

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.…”