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-610
Subject Impact of halide ions on morphology and electrocatalytic performance of Pd nanostructures
Authors Anh.T.N Nguyen, Nayun Jung, Jun Ho Shim*
Department of Chemistry, Daegu University, Korea
Abstract Electrocatalysis for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) play a significant role in electrochemical energy conversion and storage technologies, including regenerative fuel cells, direct solar driven water splitting, hydrogen production from water electrolysis, rechargeable metal-air batteries, and fuel cells. In particular, traditional catalysts, such as Pt and its alloys, are commonly used as electrocatalyst materials for the ORR. However, because of expensive and limited resources, Pt cannot be used in fuel cells or other energy system on a large scale. As an alternative, the design of highly active and stable catalysts using Pd and Pd-based nanomaterials has focused attention more recently due to their relatively high ORR activity, stability, greater abundance and almost half of the cost compared to Pt. Thus, we report an efficient synthesis of size and shape-controlled Pd nanostructure in an aqueous solution and their electrocatalytic activity for ORR. The proposed synthesis was examined using L-ascorbic acid as a reducing agent of Pd2+ in the presence of both a stabilizer and a capping agent such as Pluronic F127. The resultant Pd nanoparticles have different sizes, while their shapes can be controlled by using Pluronic F127 : halide anions (Cl-, Br-, I-) with different aspect ratios. Overall, effects on structure, morphology and electrocatalytic activity of Pd or Pd-based nanostructures are characterized by transmission electron microscopy (TEM), scanning TEM, X-ray photoelectron spectroscopy, X-ray diffraction, and electrochemical analyzer. This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2016R1D1A1B03930895).
E-mail anhnguyentn@daegu.ac.kr