|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||2022 Technical Division Student Poster Contest
||SPG-11: Crumpled MoS2 Flexoelectric Energy Harvester
||Yeageun Lee, Hyung Jong Bae, Md Farhadul Haque, SungWoo Nam
|On-Site Speaker (Planned)
Direct flexoelectricity is an electric polarization resulting from a strain gradient. Theoretically, the strength of the electric polarization inversely scales with the size of materials, since the strain gradient quadratically increases as the size of materials decreases. Two-dimensional (2D) materials with atomic thinness and mechanical flexibility are therefore a promising candidate. In this study, we fabricated flexoelectric energy harvesters by utilizing 2D molybdenum disulfide (MoS2) as an active material to generate high electric signals from an applied strain gradient. We used mechanical instability induced crumpling of stacked heterostructures of graphene/MoS2/graphene on an elastomeric substrate. The fabricated flexoelectric energy harvesting devices showed up to 1V of open circuit voltage (OCV) and 10nA of short circuit current (SCC) under repetitive bending motions, and 0.03V of OCV and 0.01nA of SCC under translational motions. Furthermore, the crumpled structure allows high stain endurance, and the devices demonstrated robust stability up to 100% stretching strain.
||Nanotechnology, Energy Conversion and Storage, Other