Facile and cost-effective NiO/MgO–SiO₂ composites for efficient oxygen evolution reaction and asymmetric supercapacitor systems

RSC Advances, Journal Year: 2025, Volume and Issue: 15(9), P. 7224 - 7235

Published: Jan. 1, 2025

Biomass waste from grapefruit peel extract was used for the preparation of MgO-SiO2 composites in situ order to develop effective electrocatalytic based on NiO/MgO-SiO2. The were subsequently deposited with NiO using a modified hydrothermal method. synthesized materials analyzed investigate their morphology, crystal structure, chemical composition, functional group, and optical band gap. structural analysis allowed us determine orientation nanoparticles, cubic phase MgO, significant loss gap, enriched groups surface NiO/MgO-SiO2 composites. electrochemical properties investigated presence an alkaline solution KOH. To study oxygen evolution reaction (OER) 1 M KOH aqueous solution, different investigated. It found that composite contained highest amount (sample 3) had lower overpotential than lowest MgO-SiO2. Sample 3 exhibited 230 mV at 10 mA cm-2 over period 40 hours excellent stability. superior activity demonstrated energy storage device asymmetric supercapacitor devices fabricated solution. According ASC's specifications, specific capacitance 344.12 F g-1 density 7.31 W h kg-1 fixed current 1.5 A g-1. After 000 galvanic charge-discharge repeatable cycles g-1, sample cycling stability 88.9% percent retention. During performance evaluation composites, confirmed as potential biomass fabrication high-performance conversion devices.

Language: Английский

Recent Advances in the Application of MOFs in Supercapacitors

Batteries, Journal Year: 2025, Volume and Issue: 11(5), P. 181 - 181

Published: May 2, 2025

As the need for energy is constantly increasing and in long term fossil fuels are not an option because of global overheating due to greenhouse effect, alternative production concepts such as photovoltaics, wind energy, IR harvesters etc., have been developed. The problem that renewable sources stochastic, therefore there a electrical storage either rechargeable batteries or high-performance supercapacitors. In this respect, novel materials needed meet challenges related these technologies. Metal–organic frameworks (MOFs) represent highly promising applications supercapacitors (SCs) thus recent years become essential clean efficient conversion storage. present numerous benefits electrocatalysts, electrolyte membranes, fuel materials; they exhibit exceptional design versatility, extensive surface-to-volume ratios, permit functionalization with multivalent ligands metal centers. Here we overview MOF-based using This review deals advances Finally, outlook on future use restrictions MOFs electrochemical applications, focus supercapacitors, given.

Language: Английский