Issue 27, 2025, Issue in Progress

Heat charge and discharge performance, mechanisms, and reversibility of coupled LaNi5–La0.6Ce0.4Ni5

Abstract

A coupled LaNi5–La0.6Ce0.4Ni5 thermochemical heat storage system is proposed for storing waste heat at moderate charging temperatures (≤150 °C) and operating pressure of <30 bar H2. LaNi5 with lower equilibrium pressure (Peq) and higher reaction enthalpy is used as a high-temperature hydride (HTH) for heat storage, while La0.6Ce0.4Ni5 acts as a low-temperature hydride (LTH) for hydrogen storage. To improve the thermal conductivity and hydrogen diffusion of the hydride beds, the HTH and LTH were doped with 2 wt% multi-walled carbon nanotubes (MWCNTs). Subsequently, HTH and LTH powder samples were packed into two connected cylindrical containers (0.6 kg per container) assembled with a spiral tube heat exchanger. Upon heat charge and discharge cycles, gravimetric and volumetric energy densities reached 122.40 ± 1.37 kJ kg−1 and 60.00 ± 0.65 kW h m−3, respectively. During heat discharge, heating and cooling effects were transferred from the hydride beds using a heat transfer fluid. The compatible thermodynamics and kinetics of the HTH and LTH resulted in a comparable heat charge and discharge time (∼2 h). This is beneficial for the simple design of thermal storage systems since an extra unit of HTHs or LTHs is not required to optimize the heat exchange reaction rate.

Graphical abstract: Heat charge and discharge performance, mechanisms, and reversibility of coupled LaNi5–La0.6Ce0.4Ni5

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Article information

Article type
Paper
Submitted
05 Jan 2025
Accepted
10 Jun 2025
First published
25 Jun 2025
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2025,15, 21678-21686

Heat charge and discharge performance, mechanisms, and reversibility of coupled LaNi5–La0.6Ce0.4Ni5

P. Plerdsranoy, C. Hansongkram, S. Chirachanchai and R. Utke, RSC Adv., 2025, 15, 21678 DOI: 10.1039/D5RA00095E

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