Rapid and stable calcium-looping solar thermochemical energy storage via co-doping binary sulfate and Al–Mn–Fe oxides  

作　　者：Changjian Yuan Xianglei Liu Xinrui Wang Chao Song Hangbin Zheng Cheng Tian Ke Gao Nan Sun Zhixing Jiang Yimin Xuan Yulong Ding 

机构地区：[1]School of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing,210016,China [2]Key Laboratory of Thermal Management and Energy Utilization of Aviation Vehicles,Ministry of Industry and Information Technology,Nanjing,210016,China [3]Birmingham Centre for Energy Storage,School of Chemical Engineering,University of Birmingham,Birmingham,B152TT,UK

出　　处：《Green Energy & Environment》2024年第8期1290-1305,共16页绿色能源与环境（英文版）

基　　金：supported by the National Natural Science Foundation of China[No.51820105010 and 51888103];support from Jiangsu Province(No.BK20202008,BE2022024,BE2022602,BK20220001,BK20220009,and BK20220077).

摘　　要：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(CaCO_(3))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 synergistically 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 CaCO_(3)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 CaCO_(3)pellets over 35 cycles.Compared with pure CaCO_(3),the energy storage power density or decomposition rate is improved by 120%due to lower activation energy and promotion of Ca^(2+)diffusion by binary sulfate.The energy release or carbonation rate rises by 10%because of high O^(2-)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.

关 键 词：Calcium looping(CaL) Solar thermochemical Energy storage Binary sulfate Fast reaction kinetics 

分 类 号：TK511[动力工程及工程热物理—热能工程]