Energy Focus
- PDF / 902,895 Bytes
- 2 Pages / 585 x 783 pts Page_size
- 16 Downloads / 232 Views
Structural water plays key role in hybrid energy-storage device
E
nergy-storage devices that use layered electrodes are of great interest. Batteries are relied on for their high charge storage capability owing to ion intercalation into electrodes. Capacitors, on the other hand, output charge faster due to ion adsorption onto electrode surfaces. Hybrid energy-storage devices reap the benefits of
form around a curved sheet than a nonauxetic material. Stevens’s group is excited to explore future applications, such as interfacing auxetic materials with tissues such as the “skin that stretches and curves in multiple directions, vascular tissues, and cavities such as the stomach.”
Future Cardiovascular diseases present a huge monetary cost to society due to treatments, loss of working abilities, and Figure 2. Most materials have a positive Poisson’s ratio. This mortality. Heart modmeans that when they are stretched longitudinally, they contract els that better mimic transversally. However, auxetic materials are defined as having a negative Poisson’s ratio, which allows them to expand in multiple physiology can prodirections. An example of stretching of the auxetic cardiac patch is vide more accurate shown where increasing strains result in expansion of the scaffold assessments of drug material. Scale bar is 1 mm. Credit: Advanced Functional Materials. toxicity and enhance tissue engineering efficacy. Patches with improved mechanireported by David Cyranoski in Nature cal properties can meet the biomechani(doi:10.1038/d41586-018-05278-8). An cal demands simultaneously with the exciting area in the future for materials biochemical/electrical needs of the heart researchers is to synergize their creativity to improve treatment outcomes. in materials designs with patient-derived Materials innovations have significantly stem cells to improve (personalize) drug impacted diagnosis and clinical treatment screening and cardiac regeneration. of heart disease. Recently, the Japanese government has given the green light for Andy Tay, of Stanford University, is the inclinical trials of cardiac patches loaded augural MRS Bulletin 2017 Postdoctoral with stem cells for heart regeneration, as Publication Prize recipient.
both. Now Veronica Augustyn’s research group from North Carolina State University has examined another important property of layered energy-storage electrodes: their mechanical behavior during charging and discharging. The researchers used this insight to show how water embedded into a structure can transform its energy-storage behavior from battery-like to capacitor-like. Since ion intercalation significantly strains materials, outstanding battery electrode structures must bend and expand
with relative ease to accommodate ions in order to offer high power densities and rate capabilities. While observing and quantifying local mechanical flexibility is tricky, an appropriate probe characterization technique, coupled with electrochemical cycling, can provide this information. The team has designed an in operando method
Data Loading...
