125th General Meeting of the KCS

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Type Oral Presentation
Area Oral Presentation for Young Material Chemists
Room No. Room 303 (Live Streaming)
Time TUE 10:30-10:45
Code MAT.O-7
Subject Photocatalytic Nanoarchitectonics Toward Efficient Overall Water Splitting Reaction
Authors Dongseok Kim, Byeong-Su Kim*
Department of Chemistry, Yonsei University, Korea
Abstract Nanoarchitectonics is a methodological term to describe the fabrication for functional nanomaterials. It can be used to architect the complicated and hierarchical structures of multiple components with nanoscale precision. As a part of nanoarchitectonics, Layer-by-layer (LbL) assembly is a highly versatile tool that can be used to fabricate thin film electrodes with multifunctional nanomaterials with a variety of advantages, such as simplicity, environmental benignity, and aqueous processability. Thus, nanoarchitectonics using LbL assembly can propose a unique and methodological strategy for various applications, including photoelectrochemical (PEC) cells, assisting the charge transfer with precise energy level engineering between each semiconducting material within the multilayer photoelectrode. Along with that, we suggested a multilayer photoelectrode, composed of a ruthenium-based coordination complex with terpyridine (TPY2Ru), and nano-sized graphene oxide (nGO), employing a versatile LbL assembly. The unique combination with nanoscale control and energy level adjusting enables not only synergistic coupling effect of each component with bifunctional photocatalytic activity for overall water splitting but also development of a flexible photoelectrode with remarkable cycle retention. In addition, we developed a simple and versatile approach to enhance the charge separation efficiency of water oxidation photoanodes, employing the interfacial dipole layer induced by modifying surface of photoanodes with polyelectrolyte multilayers deposited by LbL assembly. This approach can be exploited effectively regardless of pH and types of photoelectrodes, and potentially offer insights for the design and fabrication of efficient future solar fuel energy devices.
E-mail kds38@yonsei.ac.kr