121st General Meeting of the KCS

Type Poster Presentation
Area Electrochemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code ELEC.P-573
Subject Sonochemical Preparation of Extremely Small and Amorphous binary metal-based Nanoparticles as Superior Electrocatalysts for Oxygen Evolution Reaction
Authors Ah-Hyeon Park, Young-Uk Kwon*
Department of Chemistry, Sungkyunkwan University, Korea
Abstract Highly active and durable electrocatalysts are required for the development of water electrolysis for renewable energy conversion and storage. Herein, cheap and abundant non-precious metal binary-nanomaterials have been prepared via the one-pot syntheses for oxygen evolution reaction (OER) in alkaline media. The sample that includes Fe, Co, and Ni showed an excellent catalytic activity and NiFe-based nanomaterials showed superior to OER catalytic activity and durability. By using a simple sonochemical route, we achieved the preparation of amorphous and composition tunable NiFe-based nanomaterials which are received lots of attentions as desirable and novel electrocatalyst with low overpotential for OER. Through the structural characterization, we found that these materials have extremely small particle size and homogeneous elemental compositions. Electrochemical analysis also showed that the OER activity of samples exhibit the volcano-type trend according to adjusting of Fe content. Among them, Ni70Fe30 sample showed overpotential of 292 mV at 10 mA cm-2geo and Tafel slope of 30.4 mV dec-1, which outperform that of IrOx/C (326 mV, 41.7 mV dec-1). Chronopotentiometry at 10 mA cm-2geo for 2 h of samples for durability test reveals that Ni70Fe30 sample maintains the steady-state potential compared with that of IrOx/C, meaning an excellent durability of our samples. This work demonstrates that sonochemical syntheses could be novel approach to prepare superior and durable OER electrocatalyst for water electrolysis and metal-air battery.
E-mail pah802@naver.com