首页|Rapid and stable calcium-looping solar thermochemical energy storage via co-doping binary sulfate and Al-Mn-Fe oxides
Rapid and stable calcium-looping solar thermochemical energy storage via co-doping binary sulfate and Al-Mn-Fe oxides
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Solar thermochemical energy storage based on calcium looping(CaL)process is a promising technology for next-generation concentrated solar power(CSP)systems.However,conventional calcium carbonate(CaCO3)pellets suffer from slow reaction kinetics,poor stability,and low solar absorptance.Here,we successfully realized high power density and highly stable solar thermochemical energy storage/release by syn-ergistically accelerating energy storage/release via binary sulfate and promoting cycle stability,mechanical strength,and solar absorptance via Al-Mn-Fe oxides.The energy storage density of proposed CaCO3 pellets is still as high as 1455 kJ kg-1 with only a slight decay rate of 4.91%over 100 cycles,which is higher than that of state-of-the-art pellets in the literature,in stark contrast to 69.9%of pure CaCO3 pellets over 35 cycles.Compared with pure CaCO3,the energy storage power density or decomposition rate is improved by 120%due to lower activation energy and promotion of Ca2+diffusion by binary sulfate.The energy release or carbonation rate rises by 10%because of high O2-transport ability of molten binary sulfate.Benefiting from fast energy storage/release rate and high solar absorptance,thermochemical energy storage efficiency is enhanced by more than 50%under direct solar irradiation.This work paves the way for application of direct solar thermochemical energy storage techniques via achieving fast energy storage/release rate,high energy density,good cyclic stability,and high solar absorptance simultaneously.
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