DS0202 - Captage des énergies renouvelables et récupération des énergies de l’environnement

Energy harvesting by innovative crystal-growth system for piezoelectric – RECIPE

Submission summary

Energy harvesting is a new process based on the capture, the conversion and the store of energy from external sources, such solar power, thermal, kinetic energy or else the piezoelectricity. The choice of materials, and the ability of the compounds to be used in industrial devices, is done according the value of transfer coefficients between physical parameters (electric and thermic, electric and mechanic etc…). At present, the goal of many researches consist of having a solid state chemistry approach, in order to increase transfer coefficients, by designing new forms and new chemical formulas of compounds.

In the peculiar case of piezoelectric devices, the PZTs (Pb(ZrTi)O3) and others ‘morphotropics systems’ (PMN-PT, PSN-PT…) present very huge electromechanical coupling factors. These compounds with ‘giant’ coefficients have opened a new way to imagine real industrial solutions of energy harvesting. Since few years, parts of roads and parking areas, platforms of subway (e.g. the JR line of Tokyo) are used to convert the energy coming from cars or pedestrians. In the same manner, flexible piezoelectric smartphones, self-powered implantable cardiac devices or else electric generators based on wind vibrations are developed and tested. By converting the energy coming from the walking or the breathing, one can recharge a cell phone or an ipod. These preceding examples are various and touched many fields of the daily life. And whatever the coumpound used, we need to find “the best” and powerful piezoelectric. To an industrial point of view, the mainly work consist to optimize the shape of the material (ceramic, powder, crystal, composite…), and play of the polarization of the material (need to select and orientate piezo domains). This step is complex, and requires to select piezoelectric resonance mode and to heat/cool the material under an electric field (piezoelectric domain engineering). Moreover, even if PZTs are very attractive, the REACH standard asks to the industrials for replace lead-based materials. As a result, both scientists and industrials have to focus their researches on new materials (without Pb) and new processes. Our project ‘RECIPE’ wants to explore a new route to obtain best-performing materials. We want to play upstream, directly during the crystalline growth of compound: the goal is to apply an electric field during the crystalline growth. Scientifics objectives are (i) to investigate the role of the electric field on kinetic and thermodynamic processes during the crystalline growth; in the selection, orientation and the distribution of piezoelectric domains; (ii) to use an electric field as a new powerful tool to create new chemical structures and original multimaterials, which are expected to exhibit new physical properties.

To test this innovating technology, we plan to work on piezoelectric and ferroelastic materials, without lead, crystallizing in the perovskite structure (such as LiNbO3, BaTiO3 or else CaTiO3). We are confident that this new chemical route will open new opportunities to increase, control and modulate physical properties, in particular in the light of energy harvesting through piezoelectricity. Thus, the ‘RECIPE’ project falls within the ‘axe 2’ of ANR « Captage des énergies renouvelables et récupération des énergies de l’environnement » in the challenge « Energie pure, propre et efficace ». The proposal ‘RECIPE’ is based of a technical and a scientific innovation, and purposes a concept of rupture, to optimize good piezoelectric candidates (e.g. LiNbO3 or BaTiO3), and to design new materials.

Project coordination

Raphael Haumont (Institut de Chimie Moélculaire et Matériaux d'Orsay, équipe Synthèse, Propriétés et Modélisation des Matériaux)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

ICMMO-SP2M Institut de Chimie Moélculaire et Matériaux d'Orsay, équipe Synthèse, Propriétés et Modélisation des Matériaux

Help of the ANR 179,920 euros
Beginning and duration of the scientific project: September 2015 - 36 Months

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