Bi-functional green-synthesis of Co3O4 NPs for photocatalytic and electrochemical applications. Issue 21 (1st November 2022)

• Record Type: Journal Article
• Authors: Khalid, N.R.; Gull, Areeg; Ali, Faisal; Tahir, M.B.; Iqbal, T.; Rafique, M.; Assiri, Mohammad A.; Imran, Muhammad; Alzaid, Meshal
• Is Part Of: Ceramics international. Volume 48:Issue 21(2022)
• Page Start: 32009
• Page End: 32021
• Publication Date: 2022-11-01
• Subjects: Green-synthesis -- Nanoparticles -- Photocatalytic -- Degradation -- Methylene blue (MB) -- Electrochemical; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.07.138
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Wastewater of industries, which is polluted with different dyes is becoming a severe issue, which should be tackled on priority bases such as to provide an eco-friendly environment. In addition to this, in search of an efficient green synthesized capacitive electrode material, we have synthesized cobalt oxide (Co3 O4 ) nano-materials by employing green chili and sunflower seeds extracts. The as synthesized samples are labeled as Co-P, Co-GC and Co-SF. The successful fabrication of these samples was tested by X-ray diffraction (XRD), scanning electron microscope (SEM), Xray photoelectron spectroscope (XPS). These tests have explored successful fabrication of Co3 O4 -based samples comprised on nanoparticles (NPs) in the range of 35–45 nm. Optical properties were studied by UV–vis spectroscope and Co-SF sample has exhibited lowest energy band gap i.e 2.41 eV. Photoluminescence (PL) analysis has explored that Co3 O4 NPs prepared by sunflower extracts have offered lowest recombination rate. Among of Co-P, Co-GC and Co-SF photocatalysts, Co-SF has shown excellent photodegradation activity, which is 90% against a water pollutant name as methylene blue (MB) under UV–Vis light. This sample also has shown a good catalytic stability i.e 80.7%. Moreover, for electrochemical performance analysis, cyclic voltammetry (CV), galvanostatic charge discharge (GCD) and electrochemical impedance spectroscopic (EIS) tests were also performed. Among of Co-P, Co-GC and Co-SF samples, Co-SF sample has offered 1080.32 F/g specific capacitance and 86.70% capacitance retention at higher scan rate i.e 10 A/g. Additionally, this optimized sample has also maintained 83.51% capacitance even after 5000 GCD cycles performed at 1 A/g, and good conductive nature. These extraordinary results have provided new platform for water purification and energy storage appliances.