Platinum nanoparticles involved on nitrogen and sulfur-doped nanomaterial as fuel cell electrode

A fuel cell is an electrochemical cell that converts a source fuel into an electrical current. It generates electricity inside a cell through reactions between a fuel and an oxidant, triggered in the presence of an electrolyte. Fuel cells have been attracting more and more attention in recent decades due to high-energy demands, fossil fuel depletions, and environmental pollution throughout world. In this study, a facile and cost-effective catalysts have been developed on platinum nanoparticles (PtNPs) supported on nitrogen and sulfur-doped nanomaterial (PtNPs-NS). The successful synthesis of nanomaterials and the prepared glassy carbon electrode (GCE) surfaces were confirmed by transmission electron microscope (TEM), X-ray photo electron spectroscopy, cyclic voltammetry and electrochemical impedance spectroscopy. According to TEM images, the average particle sizes of PtNPs were found to be approximately 20–25 nm. The effective surface areas of NS/GCE and PtNPs-NS/GCE were calculated to be 105 and 518 cm2/mg, respectively. The PtNPs-NS/GCE also exhibited a higher peak current for methanol oxidation than those of comparable GCE and NS/GCE, providing evidence for its higher electro-catalytic activity. © 2016, Springer Science+Business Media New York

Validated electrochemical immunosensor for ultra-sensitive procalcitonin detection: Carbon electrode modified with gold nanoparticles functionalized sulfur doped MXene as sensor platform and carboxylated graphitic carbon nitride as signal amplification

Septicemia, also known as sepsis, refers to a systemic inflammatory response syndrome and becomes the dominant reason of mortality for seriously diseases. Procalcitonin (PCT), the peptide precursor of the hormones, is a key biomarker of septicemia in the diagnosis and detection of bacterial inflammation. In this study, an ultra-sensitive sandwich type electrochemical immunosensor for PCT detection was constructed. Firstly, delaminated sulfur-doped MXene (d-S-Ti3C2TX MXene) modified glassy carbon electrode (GCE) including gold nanoparticles (AuNPs) was utilized as immunosensor platform to increase the amount of PCT antibody1 (Ab1). After that, carboxylated graphitic carbon nitride (c-g-C3N4) was used to label PCT Ab2 as signal amplification. The structure of electrochemical immunosensor was highlighted by x-ray diffraction (XRD) method, scanning electron microscope (SEM), transmission electron microscopy (TEM), x-ray photoelectron spectroscopy (XPS), fourier transform infrared spectroscopy (FTIR), electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). Herein, c-g-C3N4 not only has excellent catalytic activity toward H2O2 for signal amplification, but also can be directly utilized as redox probe. The analytical results have revealed that 0.01 - 1.0 pg mL-1 and 2.0 fg mL-1 were found as linearity range and limit of detection (LOD). Furthermore, the validated electrochemical immunosensor was examined in terms of stability, repeatability, reproducibility and reusability. Finally, the immunosensor was applied to plasma samples having high recovery. © 2020 Elsevier B.V

Electrochemical detection of atrazine in wastewater samples by copper oxide (CuO) nanoparticles ionic liquid modified electrode

In the present report, a new voltammetric sensor based on copper oxide nanoparticles involved in 2-(3-acetoxy-4-methoxybenzylidenamino)-thiophenol (AMT) ionic liquid (CuO NPs/ILs) was developed for atrazine (ATR) analysis. Firstly, the CuO NPs/ILs modified surface was investigated by using transmission electron microscopy (TEM), X-ray diffraction (XRD), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and energy dispersive X-ray analysis (EDX). The linearity range and the detection limit (LOD) of the prepared sensor were calculated as 1.0 × 10− 11–2.0 × 10− 9 and 2.0 × 10− 12 M, respectively. Voltammetric sensor was also applied to wastewater samples with high recovery. © 2017 Elsevier B.V

Platinum nanoparticles supported on nitrogen and sulfur-doped reduced graphene oxide nanomaterial as highly active electrocatalysts for methanol oxidation

A fuel cell is an electrochemical cell that converts a source fuel into an electrical current. It generates electricity inside a cell through reactions between a fuel and an oxidant, triggered in the presence of an electrolyte. Fuel cells have been attracting more and more attention in recent decades due to high-energy demands, fossil fuel depletions and environmental pollution throughout world. In this study, a facile and cost-effective catalysts have been developed on platinum nanoparticles (PtNPs) supported on nitrogen and sulfur-doped reduced graphene oxide (NSrGO). The successful synthesis of nanomaterials and the prepared glassy carbon electrode (GCE) surfaces were confirmed by transmission electron microscope (TEM), X-ray photo electron spectroscopy (XPS), scanning electron microscope (SEM) and electrochemical impedance spectroscopy (EIS). According to TEM images, the average particle sizes of PtNPs were found to be approximately 15–20 nm. The effective surface areas (ESA) of NSrGO/GCE and PtNPs/NSrGO/GCE were calculated to be 148 and 469 cm2/mg, respectively. The PtNPs/NSrGO/GCE also exhibited a higher peak current for methanol oxidation than those of comparable GCE and NSrGO/GCE, providing evidence for its higher electro-catalytic activity. © 2016, Springer Science+Business Media New York

A highly selective and sensitive voltammetric sensor with molecularly imprinted polymer based silver@gold nanoparticles/ionic liquid modified glassy carbon electrode for determination of ceftizoxime

Ceftizoxime (CFX) is used to reduce the infection caused by both gram-negative and gram-positive bacteria. In this report, silver@gold nanoparticles (Ag@AuNPs) involved in 5-(5-bromo-2-hydroxybenzylidenamino)-2-mercaptobenzimidazole (ILs) was firstly synthesized. After that, CFX imprinted glassy carbon electrode (GCE) was prepared. The formation of the surfaces was characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), electrochemical impedance spectroscopy (EIS) and x-ray photoelectron spectroscopy (XPS). CFX imprinted electrochemical surface was formed in the presence of 100.0 mM phenol containing 25.0 mM CFX as template. The linearity range and the detection limit (LOD) of the developed nanosensor were calculated as 1.0 × 10− 9 - 1.0 × 10− 11 M and 2.0 × 10− 12 M, respectively. © 2017 Elsevier B.V

Structural, Spectroscopic, Electronic and Molecular Docking Studies on (11R,12 S)-16-Aminotetracyclo[6.6.2.0(2,7).0(9,14)]hexadeca-2(7),3,5,9(14),10,12-hexaen-15-ol

Alanazi, Mohammed/0000-0002-0483-8113; Gokce, Halil/0000-0003-2258-859X; , Nuri/0000-0001-8742-0160; Al-agamy, Mohamed/0000-0001-9868-0355WOS: 000456717300009Molecular structure analysis, vibrational and electronic spectroscopic studies and thermochemical features of (11R,12 S)-16-aminotetracyclo[6.6.2.0(2,7).0(9,14)]hexadeca-2(7),3,5,9(14),10,12-hexaen-15-ol were investigated via both theoretical and experimental techniques. Experimental investigations were made by using FT-IR, Raman, H-1 and C-13 NMR and UV-Vis. spectroscopies. To support experimental evidences, molecular electronic structure computations were obtained with the DFT/B3LYP method at the 6-311G++(3d,3p) basis set. 2D and 3D Hirshfeld surfaces studies were performed to understand non-bonding intermolecular interactions in solid phase crystal packing of the compound. MEP surface analysis was performed to investigate nucleophilic and electrophilic reactive sites of the compound. The highest occupied molecular orbitals (HOMOs) and lowest unoccupied molecular orbitals (LUMO) analyses were theoretically used for determination of electronic transitions corresponding to UV-Vis. electronic absorption wavelengths. Enzyme-ligand interactions between the compound with BACE1 (Beta-Secretase1) inhibitor were determined via molecular docking study.Deanship of Scientific Research at King Saud UniversityDeanship of Scientific Research at King Saud University [RGP-163]The authors extend their appreciation to the Deanship of Scientific Research at King Saud University for funding the work through the research group project No. RGP-163