POS6-1480
Chemical Functionalization of Graphene Oxide for Enhanced Triboelectric Charge Density in Textile-based Triboelectric Nanogenerators
When and Where
Nov 30, -0001
00:00 - 00:00
Room 301 (Grand Ballroom)
Presenter(s)
MUHAMMAD TOUQEER (Department of Chemistry, University of Ulsan)
Co-Author(s)
Abstract
Chemical modulation of functional materials has emerged as a promising strategy for enhancing the performance of triboelectric nanogenerators (TENGs) for sustainable energy harvesting. In this work, we present a simple, solution-processable, and scalable chemical functionalization strategy to systematically tailor the electronic properties of graphene oxide (GO) by covalently grafting electron-withdrawing and electron-donating groups onto its surface. A flexible and wearable GO-coated nickel fabric was employed as the triboelectric layer, providing an ideal platform for surface chemical modification through a facile vapor-phase functionalization process. The introduction of EWGs and EDGs effectively modulated the electronic structure of GO by shifting its Fermi level and work function, thereby regulating the surface charge density and triboelectric polarity. The chemically functionalized GO-based TENGs exhibited voltage of 923 V and current density of 14 µA/cm2 showing excellent agreement with density functional theory (DFT) predictions. A comprehensive functionalization mechanism describing the interaction between GO and various chemical substituents is also proposed. This work presents a unique approach to make GO a more versatile material for triboelectricity through molecular engineering. More importantly, it establishes a universal strategy for developing triboelectric materials with tunable positive and negative polarities from single parent material, opening new opportunities for high-performance, flexible, and wearable energy-harvesting devices.
