Evaluation of Thermochemical Energy Storage Performance of Fe-/Mn-Doped, Zr-Stabilized, CaO-Based Composites under Different Thermal Energy Storage Modes

Abstract

CaCO3/CaO materials possess the advantages of low cost, high energy storage density, and working temperature, which offer these materials the potential to be used in thermochemical energy storage systems for concentrated solar power plants. However, CaCO3/CaO materials possess poor antisintering and optical absorption abilities, largely limiting their practicability for direct solar utilization. In this study, binary ion doping of Fe/Mn and Zr-based stabilizer incorporation were simultaneously conducted to improve the cyclic thermal energy storage/release performance of CaCO3/CaO materials. The spectral absorbance of synthetic CaO-based composites (ranging from 77.8% to 84.0%) doped with binary ions of Fe/Mn is greatly increased in comparison to that of pure CaO (∼12.2%) due to the generation of black Ca2Fe2O5 and Ca4Mn3O10. The cyclic thermal energy storage/release performances of synthetic CaO-based composites were comparatively investigated under two thermal energy storage modes (CSP-N2 and CSP-CO2). The Zr-doped, CaO-based composites exhibit a cycling stability superior to those of Zr-free CaO-based composites due to the generated inert CaZrO3 with desirable antisintering ability, and the superiority is more prominent under CSP-CO2 mode. After 50 cycles, the CaO-based composite with a molar ratio of Ca:Zr = 100:6.7 exhibits a remarkably stable energy release density of 1.02 MJ/kg under CSP-CO2 mode, retaining 88.9% of its initial energy release density.

Ruddlesden‐Popper‐type perovskite Sr3Fe2O7−δ for enhanced thermochemical energy storage

“…It is worth mentioning that the spectral absorbance of materials in the metal oxide system is relatively positive, which is much higher than that of the CaCO 3 /CaO system which discussed this issue primarily. The optical absorption of pure CaCO 3 /CaO is about 11% from 300 to 2500 nm and remains very low in the whole wavelength range 4,34,48 . The sunlight absorption capacity can be roughly estimated through the color of samples, but there are still some differences in the specific absorbance.…”

“…Solar energy is the most abundant renewable energy and solar power generation technology can be divided into photovoltaic (PV) and concentrated solar power (CSP) 3 . CSP can be combined with efficient energy storage system to overcome the discontinuity of solar energy and achieve 24‐h electricity supply 4 …”

Enhanced CO2 Capture Durability and Mechanical Properties Using Cellulose-Templated CaO-Based Pellets with Steam Injection during Calcination

“…Reducing carbon emissions has become an international consensus to prevent global warming . CO 2 capture, utilization, and storage (CCUS) technology becomes a preferable option to achieve near-zero carbon emissions considering technical feasibility and investment cost. , Low cost and broad applicability make calcium looping (CaL) one of the most promising CCUS technologies. , Apart from the application in cyclic CO 2 capture, the CaO-based material also demonstrates the versatility of being used as the catalyst/absorbent in the sorption-enhanced hydrogen production , and heat carrier in the thermal chemical energy storage coupling with concentrating solar energy. , The common demand for the CaO-based material among the scenarios mentioned above lies in the cyclic durability and mechanical strength.…”

“…5,6 Apart from the application in cyclic CO 2 capture, the CaO-based material also demonstrates the versatility of being used as the catalyst/absorbent in the sorption-enhanced hydrogen production 7,8 and heat carrier in the thermal chemical energy storage coupling with concentrating solar energy. 9,10 The common demand for the CaObased material among the scenarios mentioned above lies in the cyclic durability and mechanical strength.…”

Direct Conversion of Desiliconization Slag to a CaO-Mesoporous Silica Composite for CO₂ Capture: Effect of Acid Dissolution Agent

“…16) Previous literature reported that most of the CaO-based adsorbents are suffered from a loss of adsorption uptake during the repeated cycle of the adsorption-desorption process because of the sintering. [17][18][19] The surface area and porosity of the adsorbent are continuously reduced during sintering, resulting in a lower CO 2 adsorption uptake. This phenomenon has sparked the interest of researchers striving to enhance the regenerating capabilities of CaO-based adsorbents.…”