Search

Owing to the higher global energy needs through cleaner sources the present study manifests a modified and ecofriendly method for the fabrication of CuO–Sb2O3-based electrode for electrochemical experiments. The aqueous solution derived from the Amaranthus viridis L. plant, belonging to the Amaranthaceae family, was employed as a reducing agent in order to impact the structure of CuO–Sb2O3 nanocomposites. The improved material exhibited a regular crystal size of 40.04 nm that is in excellent accordance with the findings obtained from scanning electron microscopy (SEM). Fourier-transform infrared spectroscopy, FE-SEM, and energy-dispersive spectroscopy were utilized in order to examine and assess the synthesized nanocomposite. Based on the Tauc plot, the optical bandgap energy was found to be 2.7 eV. The bioorganic framework-derived CuO–Sb2O3 electrode was then evaluated for energy generation and storage applications, with cyclic voltammetry revealing a capacitance of 344.4 F/g at 2 mV/s. Hydrogen evolution reaction and oxygen evolution reactions demonstrated the electrocatalytic potential of CuO–Sb2O3 as a water splitting electrocatalyst, with the highest efficiency of the electrode up to 18 h for HER. [ABSTRACT FROM AUTHOR]

Designing efficient electrocatalytic systems through facile synthesis remains a formidable task. To address this issue, this paper presents the design of a combination material comprising two transition metal oxides (copper oxide and manganese oxide (CuO/MnO2)), synthesized using a conventional microwave technique to efficiently engage as an active oxygen evolution reaction (OER) catalyst. The structural and morphological properties of the composite were confirmed by the aid of X-ray diffraction (XRD) studies, field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), and energy-dispersive spectrometry (EDS). FESEM clearly indicated well-aligned interlacing of CuO with MnO2. The OER performance was carried out in 1 M KOH. The assembled CuO/MnO2 delivered a benchmark current density (j = 10 mA cm−2) at a minimal overpotential (η = 294 mV), while pristine CuO required a high η (316 mV). Additionally, the CuO/MnO2 electrocatalyst exhibited stability for more than 15 h. These enhanced electrochemical performances were attributed to the large volume and expanded diameter of the pores, which offer ample surface area for catalytic reactions to boost OER. Furthermore, the rate kinetics of the OER are favored in composite due to low Tafel slope (77 mV/dec) compared to CuO (80 mV/dec). [ABSTRACT FROM AUTHOR]

Potentially superior to rare earth metal-containing electrocatalysts for the oxygen evolution reaction electrolysis, transition metal chalcogenides have yet to reach a catalytic activity that would allow them to be extensively adopted. In light of this, it is crucial to develop coherent designs for transition metal-based electrocatalysts on conducting polymer support to achieve high-efficiency OER. Herein, we present an easy solvothermal synthesis and exceptional catalytic performance of CoSe@gCN as an OER electrocatalyst in basic media. The synthesized materials were observed by various analysis. The phase composition confirmed by the X-rays diffraction (XRD) technique and further morphological analysis indicates the morphology of CoSe@gCN, which are considered responsible for revealing a great number of active spots and enhanced electrochemically active surface area. On the other hand, superior OER crusade and stability of the CoSe@gCN electrode with (overpotential of 174 mV, Tafel slope of 57 mV dec−1) in 1.0 M basic KOH are caused by the NF's excellent conductivity and highly porous framework, and a higher value of specific surface area. It also maintained high stability for almost 20 h, showing the higher OER activity in industrial application. As a result, our findings interpret that the transition metal chalcogenides with certain morphology can enhance electrocatalytic efficiency with graphitic carbon nitride, which demonstrates its potential for stable and sustainable energy production. [ABSTRACT FROM AUTHOR]

• Construction of Co 2 C-covered NiTe (Co 2 C-NiTe) nanosheets like electrocatalyst. • Co 2 C-NiTe delivers 10/-10 mAcm−2 at low overpotentials of 279/227 mV for OER/HER. • Long-term stability > 90 h for OER and HER in 1 M KOH. • Synergistic effects arise with abundant interfacial areas and active sites by Co 2 C covering NiTe. • The constructed bifunctional Co 2 C-NiTe electrocatalyst is efficient for practical water electrolysis. To tackle global carbon conditions, renewable energy-powered electrochemical water splitting is a promising energy conversion device that can enhance the sustainable hydrogen output of the next generation. Regarding large-scale water splitting, novel non-noble metal-based heterostructures focus on constructing highly efficient electrocatalysts with unique interfaces toward hydrogen and oxygen evolution reactions. In this work, to facilitate the limited number of defects in the pure Co 2 C and NiTe electrocatalysts, we report that NiTe nanoflakes are coupled with a dispersed nanosheet network of the Co 2 C to develop a Co 2 C-NiTe composite by interface engineering strategy using a hydrothermal approach. XRD, IV, BET, TEM, XPS, and EDX mapping technologies investigated the 3D structure of as-grown Co 2 C-NiTe/SS. Electrochemical test results revealed that our best-performing electrocatalyst delivers a 10 mAcm−2 with low overpotentials of 279 mV and 227 mV for oxidation and reduction reactions, respectively. Remarkably, this catalyst achieves good stability, reaching up to 90 h in one mol alkaline medium. We showed that this excellent activity of Co 2 C-NiTe is primarily due to the abundant interfacial area and stable anchoring sites, which improve the adsorption–desorption energy for hydroxide/oxyhydroxide species and thereby provide a fast electron transfer rate for OER/HER. In addition, a synergistic effect of Co 2 C with NiTe presents high electrical conductivity over counterpart electrocatalysts. [ABSTRACT FROM AUTHOR]