122nd General Meeting of the KCS

Type Poster Presentation
Area Electrochemistry
Room No. Grand Ballroom
Time 10월 19일 (금요일) 11:00~12:30
Code ELEC.P-461
Subject Hollow manganese oxides nanotube as a bifunctional catalyst for oxygen reduction and oxygen evolution reactions
Authors Sunguk Noh, Jun Ho Shim*
Department of Chemistry, Daegu University, Korea
Abstract Various transition metal oxides have been widely studied as electrode materials for these reactions because of their wide applications in different fields such as rechargeable batteries, chemical sensing devices, catalysis, and microelectronics. Among transition metal oxides, manganese oxide is one of the most attractive electrode materials for fuel cells and water splitting with environmental friendliness, low cost, and natural abundance. However, its potential application in these fields is limited by its poor electrical conductivity and large volume expansion during repeated cycling processes. In this presentation, we present a simple chemical approach to the synthesis of hollow manganese oxides nanotubes using carbon nanotubes (CNTs) as an efficient template. Manganese oxide produced by the reaction between potassium permanganate and acid is coated on CNT and heat treatment is performed to obtain hollow nanotubes. Such a nanostructure can be used as an electrode catalyst for improved catalytic activity in an oxygen reduction reaction (ORR) and an oxygen evolution reaction (OER). Compositional and structural features are characterized by scanning electron microscopy equipped with an energy dispersive X-ray spectroscopy, high-resolution transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The electrocatalytic activity of the manganese oxide nanotubes for ORR and OER in alkaline media was investigated by rotating disk electrode, rotating-ring disk electrode, and cyclic voltammetry. 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 tmddnr1919@naver.com