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Superior Performance of Microporous Aluminophosphate with LTA Topology in Solar‐Energy Storage and Heat Reallocation
Author(s) -
Krajnc Andraž,
Varlec Jure,
Mazaj Matjaž,
Ristić Alenka,
Logar Nataša Zabukovec,
Mali Gregor
Publication year - 2017
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201601815
Subject(s) - materials science , sorption , microporous material , desorption , zeolite , chemical engineering , hydrogen storage , evaporator , porous medium , topology (electrical circuits) , adsorption , energy storage , porosity , volume (thermodynamics) , thermodynamics , heat exchanger , composite material , organic chemistry , chemistry , power (physics) , physics , engineering , mathematics , alloy , combinatorics , catalysis
Hydrophilic porous materials are recognized as very promising materials for water‐sorption‐based energy storage and transformation. In this study, a porous, zeolite‐like aluminophosphate with LTA (Linde Type A) topology is inspected as an energy‐storage material. The study is motivated by the material's high predicted pore volume. According to sorption and calorimetric tests, the aluminophosphate outperforms all other zeolite‐like and metal‐organic porous materials tested so far. It adsorbs water in an extremely narrow relative‐pressure interval (0.10 < p / p 0 < 0.15) and exhibits superior water uptake (0.42 g g −1 ) and energy‐storage capacity (527 kW h m −3 ). It also shows remarkable cycling stability; after 40 cycles of adsorption/desorption its capacity drops by less than 2%. Desorption temperature for this material, which is one of crucial parameters in applications, is lower from desorption temperatures of other tested materials by 10–15 °C. Furthermore, its heat‐pump performance is very high, allowing efficient cooling in demanding conditions (with cooling power up to 350 kW h m −3 even at 30 °C temperature difference between evaporator and environment). On the microscopic scale, sorption mechanism in AlPO 4 ‐LTA is elucidated by X‐ray diffraction, nuclear magnetic resonance measurements, and first‐principles calculations. In this aluminophosphate, energy is stored predominately in hydrogen‐bonded network of water molecules within the pores.