Chemical Storage of Ammonia through Dynamic Structural Transformation of a Hybrid Perovskite Compound
J. Muralidhar, Krishnachary Salikolimi, Kiyohiro Adachi, Daisuke Hashizume, Koichi Kodama, Takuji Hirose, Yoshihiro Ito, Masuki Kawamoto
Abstract
Toward renewable energy for global leveling, compounds that can store ammonia (NH 3 ), a carbon-free energy carrier of hydrogen, will be of great value. Here, we report an organic–inorganic halide perovskite compound that can chemically store NH 3 through dynamic structural transformation. Upon NH 3 uptake, a chemical structure change occurs from a one-dimensional columnar structure to a two-dimensional layered structure by addition reaction. NH 3 uptake is estimated to be 10.2 mmol g –1 at 1 bar and 25 °C. In addition, NH 3 extraction can be performed by a condensation reaction at 50 °C under vacuum. X-ray diffraction analysis reveals that reversible NH 3 uptake/extraction originates from a cation/anion exchange reaction. This structural transformation shows the potential to integrate efficient uptake and extraction in a hybrid perovskite compound through chemical reaction. These findings will pave the way for further exploration of dynamic, reversible, and functionally useful compounds for chemical storage of NH 3 .