Fabrication and Investigation of Novel Cu2O-doped CaCO3 Composites-based Thermochemical Energy Storage System for Concentrating Solar Power Application
DOI:
https://doi.org/10.15377/2409-5826.2024.11.3Keywords:
Catalysis, Kinetic Analysis, Thermal energy storage, Non-isothermal methods, Physical characterizationsAbstract
The limited solar energy absorption capacity of CaCO3 hinders its efficacy in thermochemical energy storage (TCES) systems for concentrated solar power (CSP) facilities. This study aims to tackle this problem by introducing Cu2O as a dopant in CaCO3. Cu2O possesses a bandgap that is more conducive to solar absorption. This study examines the structural, optical, and thermal characteristics of CaCO3 doped with Cu2O to improve its effectiveness in TCES applications. Therefore, the current study investigates the sunlight absorption of CaCO3 material after doping Cu2O. Cu2O in CaCO3 is doped and its UV, FTIR, and XRD characteristics are analyzed. Furthermore, non-isothermal and isothermal calcination was conducted to determine the kinetics and lower the calcination temperature limit. The results reveal that Cu2O introduced no new phase in CaCO3, and XRD data confirmed it. UV data reveals that the Cu2O-doped CaCO3 has a bandgap of 5.01 eV, while pure CaCO3 has a bandgap of 5.30 eV. According to the kinetic analysis, Cu2O-doped CaCO3 follows the three-dimensional diffusion (D3) model. Its activation energy is 644.3 kJ/mol, while pure CaCO3 follows the D1 model, and its activation energy is calculated as 234.8 kJ/mol. The lowest calcination temperature limit for pure and Cu2O-doped CaCO3 samples is 750°C. Hence, the proposed material is recommended for use in thermal energy storage applications.
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