Enhancing cyclic durability in CaO-based thermochemical energy storage by Zr-Y co-doping: Mechanistic insights

被引：5

作者：

Zhang, Huajing ^{[1
]}

Xu, Chao ^{[1
]}

Xing, Jiaxin ^{[1
]}

Xu, Bowen ^{[1
]}

Sun, Xiangyu ^{[1
]}

Liao, Zhirong ^{[1
]}

Xia, Xin ^{[1
]}

Jin, Fei ^{[2
]}

机构：

[1] North China Elect Power Univ, Sch Energy Power & Mech Engn, Key Lab Power Stn Energy Transfer Convers & Syst, MOE, Beijing 102206, Peoples R China

[2] North Minzu Univ, Sch Chem & Chem Engn, Ningxia Key Lab Solar Chem Convers Technol, State Ethn Affairs Commiss, Yinchuan 750021, Peoples R China

来源：

SOLAR ENERGY MATERIALS AND SOLAR CELLS | 2024年 / 266卷

基金：

中国国家自然科学基金;

关键词：

Thermochemical energy storage; Calcium looping; Zr-Y co-doped CaO-based composite; Long-term cyclic stability; Anti-sintering; CONCENTRATED SOLAR POWER; MULTICYCLE ACTIVITY; LOOPING PROCESS; CAPTURE; PERFORMANCE; COMPOSITE; SORBENT; INTEGRATION; KINETICS; SYSTEM;

D O I：

10.1016/j.solmat.2023.112680

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

The CaCO3/CaO materials are promising materials for thermochemical energy storage. However, they suffer from rapidly decreasing energy storage density over multiple calcination/carbonation cycles. This paper aims to select suitable inert supports with cyclic stability enhancement for the calcium looping (CaL) process at high carbonation reaction temperatures (> 800 degrees C). Firstly, four metallic elements (Zr, Mn, Y and Ce) were selected, and a single-doping strategy was used to screen out single-doping inert supports. By comparison, the 20Ca-Zr had the best energy storage performance, with an energy storage density (E-g,E-N=30) of 1744.72 kJ/kg after 30 cycles. Subsequently, the co-doping method was applied to further screen out co-doped combinations with long-term cyclic stability potential. The Zr was co-doped with Mn, Y and Ce, respectively. Among them, the 20Ca-0.5Zr-0.5Y displayed the best cyclic stability with an average energy storage density (E-g,E-av) of 1950.69 kJ/kg in 30 cycles. Based on the chosen Zr-Y co-doped CaO-based composite, the doping concentration optimization and multiple cycles tests were carried out. The effective conversion (X-eff) of 10Ca-0.5Zr-0.5Y decreased by only 4.9 % after 60 cycles. Therefore, the Zr-Y co-doped CaO-based composite, possessing robust sintering resistance effects, is promising for long-term TCES technology.

引用

页数：15