Tuning Mg(OH)2 Structural, Physical, and Morphological Characteristics for Its Optimal Behavior in a Thermochemical Heat-Storage Application
Open Access
- 26 February 2021
- Vol. 14 (5), 1091
- https://doi.org/10.3390/ma14051091
Abstract
Thermochemical materials (TCM) are among the most promising systems to store high energy density for long-term energy storage. To be eligible as candidates, the materials have to fit many criteria such as complete reversibility of the reaction and cycling stability, high availability of the material at low cost, environmentally friendliness, and non-toxicity. Among the most promising TCM, the Mg(OH)2/MgO system appears worthy of attention for its properties in line with those required. In the last few decades, research focused its attention on the optimization of attractive hydroxide performance to achieve a better thermochemical response, however, often negatively affecting its energy density per unit of volume and therefore compromising its applicability on an industrial scale. In this study, pure Mg(OH)2 was developed using different synthesis procedures. Reverse deposition precipitation and deposition precipitation methods were used to obtain the investigated samples. By adding a cationic surfactant (cetyl trimethylammonium bromide), deposition precipitation Mg(OH)2 (CTAB-DP-MH) or changing the precipitating precursor (N-DP-MH), the structural, physical and morphological characteristics were tuned, and the results were compared with a commercial Mg(OH)2 sample. We identified a correlation between the TCM properties and the thermochemical behavior. In such a context, it was demonstrated that both CTAB-DP-MH and N-DP-MH improved the thermochemical performances of the storage medium concerning conversion (64 wt.% and 74 wt.% respectively) and stored and released heat (887 and 1041 ). In particular, using the innovative technique not yet investigated for thermal energy storage (TES) materials, with NaOH as precipitating precursor, N-DP-MH reached the highest stored and released heat capacity per volume unit, ~684 MJ/m3.
Funding Information
- National Interuniversity Consortium of Materials Science and Technology (INSTMME002)
This publication has 46 references indexed in Scilit:
- Synthesis and Nanoencapsulation of Poly(ethylene glycol)-Distearates Phase Change Materials for Latent Heat Storage and ReleaseACS Applied Energy Materials, 2020
- Multi-criteria investigation of a pumped thermal electricity storage (PTES) system with thermal integration and sensible heat storageEnergy Conversion and Management, 2020
- Thermal energy storage radiatively coupled to a supercritical Rankine cycle for electric grid supportRenewable Energy, 2020
- Dynamic optimization of control setpoints for an integrated heating and cooling system with thermal energy storagesEnergy, 2019
- Experimental and numerical investigations on high temperature cast steel based sensible heat storage systemApplied Energy, 2019
- Evaluating the global potential of aquifer thermal energy storage and determining the potential worldwide hotspots driven by socio-economic, geo-hydrologic and climatic conditionsRenewable and Sustainable Energy Reviews, 2019
- Optimization of a hybrid community district heating system integrated with thermal energy storage systemJournal of Energy Storage, 2019
- Review on heat transfer analysis in thermal energy storage using latent heat storage systems and phase change materialsInternational Journal of Energy Research, 2018
- Process integration of thermal energy storage systems – Evaluation methodology and case studiesApplied Energy, 2018
- Composite material “Mg(OH)2/vermiculite”: A promising new candidate for storage of middle temperature heatEnergy, 2012