121st General Meeting of the KCS

Type Poster Presentation
Area Environmental Energy
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code ENVR.P-663
Subject Tortuous-Path Effect on Electrocatalytic Multilayer Nanoelectrode: Diffusion Control with Sized Graphene Nanosheets
Authors Minsu Gu, Byeong-Su Kim1,*
Department of Energy Engineering, Ulsan National Institute of Science and Technology, Korea
1Department of Chemistry, Ulsan National Institute of Science and Technology, Korea
Abstract Controlling the architecture of hybrid nanomaterial electrodes is critical for understanding their fundamental electrochemical mechanisms and applying these materials in future energy conversion and storage systems. Herein, we report highly tunable electrocatalytic multilayer electrodes, composed of palladium nanoparticles (Pd NPs) supported by graphene sheets of varying lateral size, employing a versatile layer-by-layer (LbL) assembly method. We demonstrate that the electrocatalytic activity is highly tunable through control of the diffusion and electron pathways within the 3-dimensional multilayer electrodes. A larger-sized-graphene-supported electrode exhibited its maximum performance with a thinner film, due to superior charge transfer by the mass transfer limited in early stage, while a smaller-sized-graphene-supported electrode exhibited its highest current density with high mass loading in the thicker films by enabling facile mass transfer through increased diffusion pathways. These findings of tortuous-path effect on electrocatalytic electrode supported by varying sized graphene provides new insights and a novel design principle in electrode engineering that will be beneficial for the development of effective electrocatalysts.
E-mail sbgms@unist.ac.kr