Sustainable Breakthrough in Manganese Oxide Thermochemical Energy Storage: Advancing Efficient Solar Utilization and Clean Energy Development

Sustainability, Journal Year: 2025, Volume and Issue: 17(8), P. 3752 - 3752

Published: April 21, 2025

Solar power generation systems, recognized for their high energy quality and environmental benefits, require efficient storage to ensure stable grid integration reduce reliance on fossil fuels. Thermochemical (TCS) using metal oxides, such as the Mn2O3/Mn3O4 redox system, offers advantages like density, wide temperature range, stability, making it ideal solar applications. This study investigates Mn3O4 Mn2O3 initial reactants, analyzing reaction rate, conversion efficiency, cyclic performance via synchronous thermal analysis. Microstructural characterization was performed XRD, SEM, BET, XPS, nanoparticle size, zeta potential measurements. The results show that reversibly converts with over 100% efficiency five cycles 3.3% weight loss, indicating performance. oxidation follows Arrhenius’ Law below 700 °C but deviates at higher temperatures. mechanism function is G(α) = α f(α) 1, an activation of 20.47 kJ/mol a pre-exponential factor 0.268/s. synthesized ammonia precipitation exhibits reversible behavior loss samples from low-concentration precursors poor reduction has 249.87 kJ/mol. By investigating system TCS, this advances its practical into systems critical guidance developing scalable, low-carbon technologies. These findings can support Sustainable Development Goals (SDGs) by advancing renewable technologies, reducing carbon emissions, promoting sustainable grids.

Language: Английский

Understanding the Negative Apparent Activation Energy for Cu2O and CoO Oxidation Kinetics at High Temperature near Equilibrium

Catalysts, Journal Year: 2024, Volume and Issue: 14(11), P. 832 - 832

Published: Nov. 19, 2024

The pairs of Cu2O/CuO and CoO/Co3O4 as the carriers transferring oxygen storing heat are essential for recently emerged high-temperature thermochemical energy storage (TCES) system. Reported research results Cu2O CoO oxidation kinetics show that reaction rate near equilibrium decreases with temperature, which leads to negative activation obtained using Arrhenius equation apparent models. This study develops a first-principle-based theoretical model analyze kinetics. In this model, density functional theory (DFT) is adopted determine pathways obtain barriers elementary reactions; then, DFT introduced into transition state (TST) calculate constants; finally, developed describe both surface elemental reactions lattice concentration in grain. mechanism from kinetic constants TST directly implemented predict without fitting experimental data. accuracy validated by data thermogravimetric analyzer (TGA). Comparing traditional models, reasons why latter cannot appropriately true characteristics explained. jointly controlled thermodynamics (reaction driving force) constant). Without considering effect force, obtained. However, oxidation, still although force considered. According results, overall negative, but positive. Moreover, according theory, pre-exponential factor dependent on partition function ratio temperature equilibrium, being slightly lower than actual value.

Language: Английский