Green route synthesis of nanoporous copper oxide for efficient supercapacitor and capacitive deionization performances

Abstract

We demonstrate a simple template-free green method to prepare copper oxide (CuO) nanoporous material using copper acetate as a single precursor with Piper nigrum (Indian black pepper) dried fruit extract as a reducing medium under microwave irradiation. The surface properties and morphology of the obtained CuO material were assessed using powder X-ray diffractometer, X-ray photoelectron spectrometer, field-emission scanning electron microscope with elemental mapping analysis, focused ion beam high-resolution transmission electron microscope, and N 2 adsorption-isotherm techniques. The characterization results reveal that the prepared CuO is a single monoclinic crystalline phase, and nanoporous in morphology with a specific surface area of 81.23 m 2 g −1 and containing pore sizes between 3-8 nm. Nanoporous CuO showed excellent electrochemical energy storage performance with the specific capacitance of 238 Fg −1 at 5 mVs −1 when compared with commercially available CuO (75 Fg −1). Also, nanoporous CuO showed efficient desalting performance in the capacitive deionization system. This eco-friendly synthesis derived nanoporous CuO can be applied as high-performance supercapacitor material for high-energy storage devices and desalination processes.

Construction of a Cu-Based Metal–Organic Framework by Employing a Mixed-Ligand Strategy and Its Facile Conversion into Nanofibrous CuO for Electrochemical Energy Storage Applications

“…The notable supercapacitor performance of nanostructured CuO compared to Cu-MOF is ascribed to the fascinating features of CuO; the enhanced surface area ensures a uniform nanofiber-like morphology, which provides a short ion-diffusion pathway and the presence of enormous active sites for faradaic charge transfer at the electrode surface. Also, Cu-MOF-derived CuO reveals a remarkable supercapacitance performance compared to other CuO materials, ,,, which may be due to the myriad properties of MOFs and the capability of preserving their pristine characteristic after thermal/chemical conversion that provide the high surface area and specific morphology. The present work provides a feasible strategy that can be extended to obtain various other high-performing energy storage materials.…”

“…The supercapacitance performance of nanostructured CuO is compared with other related reports based on various parameters, which indicates the remarkable performance of Cu-MOF-derived CuO, demonstrating a higher specific capacitance with good long-term stability (Table S5). ,,− Hence, the MOF-derived nanostructured CuO can be an encouraging material for electrochemical energy storage because it delivers notable specific capacitance and reveals long-term cyclic stability without utilizing any costly binders/conducting additives.…”

Enhanced performance of methanol oxidation reaction via green synthesis of platinum electro‐catalyst from sugar cane bagasse

“…The EIS semicircle or arc diameter correlates with the resistance of the charge transfer. The barrier through which the electron has to travel to the adsorbed species across the electrode surface or from the adsorbed species to the electrode surface is described as R ct induced by Faradaic reaction 65 . As shown in Figure 12D, the Nyquist plot comprise of a small semicircles or arcs at the high frequency corresponding to the combination of charge transfer resistance, R ct and the double layer capacitance between the interface of the electrode and the electrolyte, whereas a straight line with a phase angle near 45° in the low frequency is related to capacitive behaviour of electrode 66 .…”

Biogenic Synthesis of High-Performance α-MoO3 Nanoparticles from Tryptophan Derivatives for Antimicrobial Agents and Electrode Materials of Supercapacitors

“…To minimize environmental pollution, plant-based green synthesis is being increasingly used for preparing metal oxide nanoparticles (NPs) for multifunctional applications [1][2][3]. Many physical and chemical methods are currently available for the synthesis of metal-oxide NPs.…”