On-Chip and Free-standing Integrated 3D Tubular Micro-supercapacitors

Date

Apr 25, 2018

Time

3:15 PM - 4:15 PM

Speaker

Jinhui Wang

Affiliation

IFW Dresden

Language

en

Main Topic

Materialien

Other Topics

Materialien, Physik

Host

Kristina Krummer-Meier

Description

The rapid development of integrated and miniaturized electronic devices for wireless sensor networks, microelectromechanical systems (MEMS), portable electronics etc., has triggered tremendous research activities towards the development of micro-scale energy storage units[1-3]. Among those units, micro-supercapacitors (MSCs) hold several intrinsic advantages, such as higher areal capacitance, longer operating lifetime, faster charge and discharge rates, higher power density, and especially, better compatibility with micro-device integration[4,5]. These merits render MSCs promising power sources for microelectronic devices[4]. Currently, the potential impact of MSCs relies on the integrated areal performance due to the limited area available in practical microelectronic circuits. Obviously, integrating more active material into cleverly designed 3D electrode architectures will effectively increase the areal performance within a limited footprint area. Therefore, to develop smart and reliable fabrication methodologies for 3D MSCs with small footprint area has become an urgent and decisive task in the field of MSCs. Rolled-up nanotechnology, a unique method to self-assemble nanomembranes into 3D structures, has already been developed for the tubular battery materials and capacitor devices[6,7]. It opens up the possibility toward the integrated 3D MSCs with small footprint area. In this seminar, my research progress on integrated 3D MSCs will be introduced. Poly(3,4-ethylenedioxythiophene) (PEDOT)-based interdigital electrodes are designed on the strained polymeric layer stack to construct the planar MSC. With rolled-up nanotechnology, this type of planar MSC could be simply self-rolled into tubular architectures within greatly reduced footprint area. Simultaneously, fully integrated hydrogel material efficiently encapsulates liquid electrolyte in the rolled-up MSCs (Fig. 1). Two types of 3D MSCs, “on-chip” and “free-standing”, have been realized in this work. Especially, the free-standing design provides a new way of fabricating mass-produced stand-alone integrated MSCs which are compatible with “pick-and-place” processes. We investigated the areal performance of on-chip tubular MSCs with different thicknesses of the PEDOT material. The optimal MSCs show areal capacitances up to 53.9 mF cm-2 at a current density of 0.5 mA cm-2, which is six times higher than state-of-the-art PEDOT-based MSCs. The 3D tubular MSCs also demonstrate remarkable cycling stability, in which the capacitance retention is up to 96% over 5000 cycles. [1] D. Qi et al. Adv. Mater. 29, 1602802 (2017). [2] Z. L. Wang. Nano Today 5, 512 (2010). [3] M. Beidaghi et al. Energy Environ. Sci. 7, 867 (2014). [4] N. A. Kyeremateng et al. Nature Nanotech., 12, 7 (2017). [5] P. Huang et al. Science 351, 691 (2016). [6] J. Deng, X. Lu, L. Liu, L. Zhang and O. G. Schmidt, Adv. Energy Mater. 6, 1600797 (2016). [7] X. Wang, Y. Chen, O. G. Schmidt and C. Yan, Chem. Soc. Rev. 45, 1308 (2016).

Links

• Seminars at the IFW

Last modified: Apr 25, 2018, 9:45:55 AM