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Proceedings Paper

Mechanism of electric power generation from ionic droplet motion on polymer supported graphene (Conference Presentation)
Author(s): Chuanshan Tian

Paper Abstract

Graphene-based electric power generation that converts mechanical energy of flow of ionic droplets over the device surface into electricity has emerged as a promising candidate for blue-energy network. Yet the lack of a microscopic understanding of the underlying mechanism has prevented ability to optimize and control the performance of such devices. This requires information on interfacial structure and charging behavior at the molecular level. Here, we use sum-frequency vibrational spectroscopy (SFVS) to probe the interface of device composed of aqueous solution, graphene and supporting polymer substrate. We discover that the surface dipole layer of the polymer is responsible for ion attraction toward and adsorption at the graphene surface that leads to electricity generation in graphene. Graphene itself does not attract ions and only acts as a conducting sheet for the induced carrier transport. Replacing the polymer by an organic ferroelectric substrate could enhance the efficiency and allow switching of the electricity generation. Our microscopic understanding of the electricity generation process paves the way for the rational design of scalable and more efficient droplet-motion-based energy transducer devices.

Paper Details

Date Published: 17 September 2018
Proc. SPIE 10753, Ultrafast Nonlinear Imaging and Spectroscopy VI, 107530P (17 September 2018); doi: 10.1117/12.2322521
Show Author Affiliations
Chuanshan Tian, Fudan Univ. (China)

Published in SPIE Proceedings Vol. 10753:
Ultrafast Nonlinear Imaging and Spectroscopy VI
Zhiwen Liu; Demetri Psaltis; Kebin Shi, Editor(s)

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