April 22 - 26, 2024
Seattle, Washington
May 7 - 9, 2024 (Virtual)

Event Supporters

2024 MRS Spring Meeting
EN02.06.03

Performance Enhancement of Moisture-Induced Power Generators under Ambient Conditions through Flashlight-Induced Graphitization of FeCl3-Impregnated Cellulose Papers

When and Where

Apr 25, 2024
8:45am - 9:00am
Room 332, Level 3, Summit

Presenter(s)

Co-Author(s)

Daewoong Kim1,Jakyung Eun1,Hyunsoo Han1,Sangmin Jeon1

Pohang University of Science and Technology1

Abstract

Daewoong Kim1,Jakyung Eun1,Hyunsoo Han1,Sangmin Jeon1

Pohang University of Science and Technology1
We introduce a novel approach for the fabrication and performance enhancement of moisture-induced power generators (MPGs) utilizing flashlight-induced graphitization (FIG). FeCl<sub>3</sub>-impregnated cellulose papers (FCPs) were photothermally converted into graphitized cellulose papers (GCPs) with a hierarchically porous structure by flashlight irradiation under ambient conditions. During the photothermal conversion process, Fe<sup>3+</sup> ions partially convert into iron oxide compounds with limited solubility, highlighting that FeCl<sub>3</sub> serves multiple roles such as catalyst for graphitization, moisture absorber, and charge carrier. When a bilayered cellulose paper (BCP), formed by stacking GCP on top of FCP, was exposed to moisture, a potential difference was generated between the collecting electrodes due to the concentration gradient of dissociated Fe<sup>3+</sup> ions within the BCP, with higher concentration in FCP and lower concentration in GCP. The resulting migration of Fe<sup>3+</sup> ions from FCP to GCP caused electron movement along the external circuit. The BCP-based MPG exhibited continuous voltage and current outputs, with maximum values of 0.39 V for voltage and 28.6 μA/cm<sup>2</sup> for current density at 45% relative humidity, marking a significant breakthrough in MPG performance under ambient humidity conditions.

Keywords

carbonization

Symposium Organizers

Jinbo Bai, CNRS ECParis
Daniel Hallinan, Florida State University
Chang Kyu Jeong, Jeonbuk National University
Andris Sutka, Riga Technical University

Session Chairs

Jinbo Bai
Seoung-Ki Lee

In this Session