Publications

As a non‐toxic species, Zn fulfills a multitude of biological roles, but its promoting effect on electrocatalysis has been rarely explored. Herein, the theoretic predications and experimental investigations that nonelectroactive Zn behaves as an effective promoter for CoP‐catalyzed hydrogen evolution reaction (HER) in both acidic and alkaline media is reported. Density function theory calculations reveal that Zn doing leads to more thermal‐neutral hydrogen adsorption free energy and thus enhanced HER activity for CoP catalyst. Electrochemical tests show that a Zn 0.08 Co 0.92 P nanowall array on titanium mesh (Zn 0.08 Co 0.92 P/TM) needs overpotentials of only 39 and 67 mV to drive a geometrical catalytic current of 10 mA cm ‐2 in 0.5 m H 2 SO 4 and 1.0 m KOH, respectively. This Zn 0.08 Co 0.92 P/TM is also superior in activity over CoP/TM for urea oxidation reaction (UOR), driving 115 mA cm ‐2 at 0.6 V in 1.0 m KOH with 0.5 m urea. The high HER and UOR activity of this bifunctional electrode enables a Zn 0.08 Co 0.92 P/TM‐based two‐electrode electrolyzer for energy‐saving hydrogen production, offering 10 mA cm ‐2 at a low voltage of 1.38 V with strong long‐term electrochemical stability.

Environmentally friendly electrochemical hydrogen production needs the development of earth-abundant catalyst materials for the hydrogen evolution reaction with high activity and durability at neutral pH. In this work, the self-templating construction of a hollow amorphous CoMoS₄ nanotube array on carbon cloth (CoMoS₄ NTA/CC) is reported, using hydrothermal treatment of a Co(OH)F nanowire array on CC in (NH₄ )₂ MoS₄ solution. When used as a 3D electrode for hydrogen evolution electrocatalysis, the resulting CoMoS₄ NTA/CC demonstrates superior catalytic activity and strong long-term electrochemical durability in 1.0 M phosphate buffer solution (pH=7). It shows small onset overpotential of 21 mV and requires low overpotentials of 104 and 179 mV to drive geometrical current densities of 10 and 50 mA cm^-2 , respectively. Density functional theory calculations suggest that CoMoS₄ has a more favorable hydrogen adsorption free energy than Co(OH)F.

Synthesis of Y(III) phosphate-functionalized polyaniline nanocomposite ([email protected](III)PO4) was achieved through sol–gel method. The synthesized [email protected](III)PO4 was characterized by various techniques including Fourier-transform infrared spectroscopy (FTIR), Field emission scanning electron microscopy (FE-SEM), Energy dispersive X-ray spectroscopy (EDX), X-ray diffraction spectroscopy (XRD), X-ray photoelectron spectroscopy (XPS), Thermogravimetric analysis (TGA)-Differential thermal analysis (TGA-DTA) and direct current (DC) electrical conductivity. Efficient employment for the nanocomposite as modifier glassy carbon electrode was characterized by electrochemical impedance spectroscopy (EIS) and cyclicvoltametry (CV). The modified electrode showed a powerful enhancing effect and great stability in electrochemical sensing of the heavy metal ion Pb(II), giving an anodic peak current with a formal potential of - 0.195 V in acetic solution. The electrochemical parameters of the proposed sensor such as exchange current density (ⅉ0), active surface area of [email protected](III)PO4 modified GCE (A), surface coverage (Γ) of Pb (II) on the surface of [email protected](III)PO4, transfer coefficient (α) and number of electrons (n) involved in the electro-reduction, were found to be 92.21 μA cm-2, 0.27 cm2, 3.24×10-7 mol cm-2, 0.26 and 1.6 ≈ 2, respectively. Two voltametric techniques namely CV and linear sweep voltammetry (LSV) studies exhibited that the anodic peak current was linearly dependent on the concentration of Pb(II) with a broad dynamic range of 2.85–199.92 μM and 2.85–62.85 μM, respectively. However, the LSV method showed the highest sensitivity (5.58 μA μM-1 Cm-2) and the lowest detection limit (0.04 μM).

The synthesis of a series of 2,3-diaryl-7-methyl-4,5,6,7-tetrahydroindazole and 3,3a,4,5,6,7-hexahydroindazole derivatives substituted with various biologically-active function groups with anticipated chemotherapeutic activity is described. 4-(7-methyl-3-aryl-3,3a,4,5,6,7-hexahydro-indazol-2-yl)benzenesulfonamides 2a-c, which were employed as key intermediates in this study, were synthesized by cyclocondensation of 6-arylidene-2-methylcyclohexanones 1a-c with 4-hydrazinobenzenesulfonamide hydrochloride. A detailed discussion of the reactions utilized in the preparation of the intermediate and target compounds is reported, and the structures of the newly synthesized compounds were substantiated with IR, (1)H and (13)C NMR spectral data and elementary microanalyses. Twenty of the newly synthesized compounds were selected by National Cancer Institute (NCI), Maryland, USA, to be evaluated for their antitumor activity and the results revealed that six compounds 3c, 4d,e, 5a,d and 8c exhibited broad spectrum of antitumor activity against most of the tested tumor cell lines. In addition, the in vitro antibacterial and antifungal activities of a number of the target compounds were also tested using the Agar-diffusion method. Some of these compounds have shown significant antibacterial and mild to moderate antifungal activities.

It is of great importance to design and develop highly active and selective electrocatalysts for the CO₂ reduction reaction (CO₂RR). In this communication, we report an iodide-derived nanostructured silver catalyst (ID-Ag) as an excellent CO₂RR catalyst that is able to electrochemically reduce CO₂ to CO with approximately 94.5% selectivity at the potential of -0.7 V in CO₂-saturated 0.5 M KHCO₃. This suggests that the highly electrochemical active surface area and adsorbed I^- anions onto the surfaces of the electrode contribute to the enhanced activity and selectivity of the nanostructured Ag electrocatalyst toward CO₂ reduction.

In this research, a newly developed structure consisting of a shell made of (Graphene oxide-Paraphenylenediamine)/Polypyrrole (Go-PPD)-PPy was successfully synthesized on a binary poly(aniline-co-o-pyrrole)/NiFe 2 O 4 core-shell nanocomposite, known as P(Ani-co-Py)/NiF NCs. The synthesis process involved a two-step approach, starting with the in-situ oxidative polymerization of the copolymer P(Ani-co-Py) on NiF nanoparticles (NPs). This was followed by a subsequent in-situ oxidative polymerization of (Go-PPD)-PPy on the P(Ani-co-Py)/NiF core-shell NCs, resulting in the formation of PPy-(Go-PPD)/P(Ani-co-Py)/NiF NCs with a core-shell-shell structure. In this method, the developed sensor designed specifically for Tl 3+ demonstrated high effectiveness and reliability in detecting Tl 3+ ions within a phosphate buffer medium. During the fabrication process of the sensor probe, the stability of the synthesized PPy-(Go-PPD)/P(Ani-co-Py)/NiF NCs on a glassy carbon electrode (GCE) was enhanced significantly by incorporating nafion, a 5% suspension in ethanol. A calibration curve was established by drawing the current toward the concentration of Tl 3+ , showing a linear relationship. By looking at the maximum linear portion of the calibration curve, a linear dynamic range of 0.1 nM to 0.01 mM was determined. Sensor sensitivity has been calculated as 1.06 µAµM −1 cm −2 , by setting the slope of the calibration curve and GCE (the surface area of the glassy carbon electrode), which was measured as 0.0316 cm 2 . The lower limit of detection (LOD) was determined to be 92.09±4.60 pM based on a signal-to-noise ratio of 3. Limit of quantification (LOQ) is calculated as 279.06 pM from 10*(LOD)/3.3. Finally, the proposed Tl 3+ ion sensor's performance was validated by analyzing real environmental samples, and satisfactory results were obtained.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.