Here, novel granular porous calcium carbonate particles with very high solar absorptance, energy storage density, abrasive resistances, and energy storage rate are proposed for direct solar thermochemical heat storage. The average solar absorptance is improved by 234% compared with ordinary particles.
Possessing nontoxicity, high CO thermodynamic cycles, calcium carbonate solar thermal power plants particles are usually white with little absorption of sun light, inhibiting their application in efficient volumetric solar energy conversion decreases rapidly with cycling. By incorporating Mn or Al elements, thecyclic stability is enhanced greatly.
Calcium carbonate is promising thermochemical heat storage material for next-generation solar power systems due to its high energy storage density, low cost, and high operation temperature.
Researchers have tried to improve energy storage performances of calcium carbonate recently, but most researches focus on powders, which are not suitable for scalable applications.
Dark CaCO 3 particles possessing full-spectrum solar absorption are designed. A theoretical model to calculate solar absorption properties of doped CaCO 3 particles is proposed. The energy storage density over 20 cycles are enhanced by about 84% (absolute value) by rational dopants.
Jiménez P E S, Perejón A, Guerrero M B, et al. High-performance and low-cost macroporous calcium oxide based materials for thermo-chemical energy storage in concentrated solar power plants. Appl Energy, 2019, 235: 543–552