Open Access

ARTICLE

Effects of Porous Graphene on LiOH Based Composite Materials for Low Temperature Thermochemical Heat Storage

Lisheng Deng^1,2, Hongyu Huang^2,*, Zhaohong He², Shijie Li², Zhen Huang², Mitsuhiro Kubota³, You Zhou^4,*, Dezhen Chen¹

1 Thermal and Environmental Engineering Institute, School of Mechanical Engineering, Tongji University, Shanghai, 200092, China
2 Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640, China
3 Department of Chemical Engineering, Graduate School of Engineering, Nagoya University, Nagoya, 464-8603, Japan
4 National Institute of Clean-and-Low-Carbon Energy, Beijing, 102200, China

* Corresponding Authors: Hongyu Huang. Email: ; You Zhou. Email:

(This article belongs to the Special Issue: New Trends in Sustainable Materials for Energy Conversion, CO₂ Capture and Pollution Control)

Journal of Renewable Materials 2022, 10(11), 2895-2906. https://doi.org/10.32604/jrm.2022.019071

Received 01 September 2021; Accepted 22 December 2021; Issue published 29 June 2022

Abstract

Thermochemical heat storage material inorganic hydrate LiOH is selected as a promising candidate material for storing low-temperature heat energy because of its high energy density (1440 kJ/kg) and mild reaction process. However, the low hydration rate of LiOH limits the performance of low temperature thermochemical heat storage system as well as the thermal conductivity. In this study, porous-graphene/LiOH composite thermochemical heat storage materials with strong water sorption property and higher thermal conductivity were synthesized by hydrothermal process. The experimental results show that the hydration rate of the composites was greatly improved. The heat storage density of the composite materials was increased by 47% (from 661 kJ/kg to 974 kJ/kg). By combing the porous graphene, the thermal conductivity of composites with different contents were highly increased by 21.1% to 78.7%, but the increase of heat storage density is opposite to that of thermal conductivity. The development of high-performance materials for thermochemical heat storage should consider the relationship between the heat storage density and thermal conductivity of the material, and the thermal conductivity of the supporter needs to be further improved.

---

Keywords

---