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Solar Thermochemical Energy Storage Through Carbonation Cycles of SrCO 3 /SrO Supported on SrZrO 3
Author(s) -
Rhodes Nathan R.,
Barde Amey,
Randhir Kelvin,
Li Like,
Hahn David W.,
Mei Renwei,
Klausner James F.,
AuYeung Nick
Publication year - 2015
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201501023
Subject(s) - carbonation , energy storage , materials science , concentrated solar power , thermal energy storage , chemical engineering , solar energy , cubic zirconia , chemistry , thermodynamics , ceramic , composite material , ecology , power (physics) , physics , biology , engineering
Solar thermochemical energy storage has enormous potential for enabling cost‐effective concentrated solar power (CSP). A thermochemical storage system based on a SrO/SrCO 3 carbonation cycle offers the ability to store and release high temperature (≈1200 °C) heat. The energy density of SrCO 3 /SrO systems supported by zirconia‐based sintering inhibitors was investigated for 15 cycles of exothermic carbonation at 1150 °C followed by decomposition at 1235 °C. A sample with 40 wt % of SrO supported by yttria‐stabilized zirconia (YSZ) shows good energy storage stability at 1450 MJ m −3 over fifteen cycles at the same cycling temperatures. After further testing over 45 cycles, a decrease in energy storage capacity to 1260 MJ m −3 is observed during the final cycle. The decrease is due to slowing carbonation kinetics, and the original value of energy density may be obtained by lengthening the carbonation steps.