Speaker
Description
The recent search for advanced materials with desired properties for the next-generation
self-powered electronics and environmental remediation devices has focused on the unique class of three-dimensional (3D) porous superstructures made of 2D materials, such as graphene, graphite, and molybdenum disulfide. In this work, we report an original and rational approach to create 3D metallic foams with tunable multi-level porosity by using a process consisting of additive electrodeposition and subtractive electroetching. The resulted metallic foams can readily serve as catalytic templates for the growth of free-standing 3D hierarchically porous thin graphite in a scalable and reproducible fashion. Owing to the tailored mechanical and electrical properties and enhanced electrochemical performances, the obtained graphite superstructures can be readily integrated with our wearable GF/polymer strain sensors and nanomotor manipulation systems into self-powered wearable sensors and portable electromechanical devices, respectively. They also remove >99.997% bacterial cells from natural water in the waller creek at the campus of UT-Austin with an estimated energy consumption of only 4J/1 L in 25 min treatment. When applied as oxygen catalyst, they exhibit a remarkably low overpotential of 204.4 mV at a current density of 10 mA cm−2, among the best of OER catalysts of similar chemistry, which also is highly reproducible and stable with over 18 h operation time.
| Speaker Country | U. S. |
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