16 juillet 2021

[Energie Storage] – Dual-functional epidermal patch with capability of harvesting and storing the energy in sweat.

Accueil > ActualitĂ©s > [Energie Storage] – Dual-functional epidermal patch with capability of harvesting and storing the energy in sweat.
Flèche contenu
biosupercapacitors - Codex international

Self-charging biosupercapacitors (BSCs) that can store energy and be self-charged via chemical or solar energy conversion through bioreaction have recently attracted considerable attention. As human sweat also contains a high concentration of lactate biofuel, the harvesting and storage of the bioenergy in sweat holds the potential to provide the power for wearable electronics.

However, materials utilized in previous BSCs are either bulky, rigid, or fragile, and therefore cannot serve as suitable candidates for stretchable conformal wearable electronic devices. For a wearable BSC, the flexibility, stretchability, and skin conformity of the device are of considerable importance.

Prof. Joseph Wang’s group in UC San Diego demonstrates the first example of an all-printed dual-functional stretchable and wearable BSC, fabricated on top of low-elastic modulus and adhesive elastic films, to harvest and store energy from sweat while maintaining intimate contact with the human skin.

This wearable hybrid device, functioning as both a biofuel cell and a supercapacitor, is demonstrated to deliver high-power pulses and be rapidly self-recharged using enzymatic oxidation of lactate biofuel from human perspiration.

This work enabled material-level integration of both functionalities on the same set of electrodes, thus reducing the system complexity and minimizing the device footprint.

[Energy Storage] – Scientists learn more about the first hours of a lithium-ion battery’s life 23 fĂ©vrier 2020

The first hours of a lithium-ion battery’s life largely determine just how well it will perform. In those moments, a set of molecules self-assembles into a structure inside the battery that will affect the battery for years to come.

Lire la suite
[Graphene] – Large-scale synthesis of graphene and other 2D materials 7 septembre 2023

Since its first demonstration in 2004, the large-scale commercial production of graphene has proven difficult and costly (‘large scale’ usually defined as weights more than 200 mg or films larger than 200 cm2). For instance, at an estimated cost of $50 000 to $200 000 per ton for graphene powders and $45 000 to $100 000 per m2 of graphene film, industrial production methods and costs are restraining graphene utility.

Lire la suite