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Hygroscopic composite material & salt apparatus [Offre de Technologie]

The technology in a nutshell

Nomastock/Corrostock are two patents developing an innovative thermal energy storage method, using:

  • A new composite material (Nomastock)
  • A new storage environment that reduces corrosion (Corrostock)

State of the art

The Thermal Storage market can be segmented into 3 distinct technologies: sensitive storage, latent storage, and thermochemical storage:
Thermochemical storage has a very high energy density, very high efficiency (theoretically zero energy losses), and allows energy to be stored over very long periods (the only technology allowing inter-seasonal storage with reduced volumes).
It is also the technology that allows the storage in a large temperature range, and is therefore also the most promising technology for the recovery of energy waste from industries for supplying homes and commercial buildings (waste convertible into very high temperature thereafter).

The Invention

The invention relates to the development of a composite material based on a hygroscopic salt (e.g. SrBr2) coupled with a porous matrix (e.g. activated carbon or silica gel) for applications in the field of thermal energy storage. This association makes it possible to stabilize the chemical absorbent which has a higher heat of absorption (compared to physical adsorption).

The originality of our invention lies in the use of SrBr2 in the pores of an activated carbon or silica gel matrix. SrBr2 is a commonly investigated salt for heat storage applications but is generally tested pure or in combination with expanded graphite to improve heat transfer. The invention allows a high salt percentage (and hence high energy densities) while keeping the material stability over cycles.

Key advantage of the technology

  • Better stability (kinetic and thermodynamic)
  • Higher energetical density
  • Lower reactor corrosion

Potential application

The technology could be used to ensure thermal energy flow regulation, and/or long-term energy storage. The use of such a flexible technology for indirect storage of green electricity (after its conversion into heat) is also possible.
It can also be used for developing thermal sorption machine for heat or cold generation as well as for heat transformation.

Technology readiness level


TRL 5  

Relevant publications

  • Al 2 O 3: Yb 3+ integrated microdisk laser label-free biosensor. De Goede, Michiel, et al. Optics letters 44.24 (2019): 5937-5940.
  • Portable microresonator-based label-free detector: monotonous resonance splitting with particle adsorption. Acharyya, Nirmalendu, Mohamed Maher, and Gregory Kozyreff. Optics express 27.24 (2019): 34997-35011.

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Mis à jour le 16 mars 2022