Dong Min Kim
Hongik University, Republic of Korea
Title: The Catalytic Activity of Cathode with Sputtered Cobalt with Graphene Oxide on Carbon Paper
Biography
Biography: Dong Min Kim
Abstract
Many efforts have been focused on the development of high-energy-density power source to power ever-increasing demand of portable devices. Polymer electrolyte membrane fuel cells (PEMFC) are efficient and clean electrochemical power devices that have the potential for applications in energy conversion and storage. The PEMFC can be operated at a low temperature about 80ËšC and can be applied mobile electric source such as Laptop, Motor vehicles, etc. After the invention of fuel cell by Sir Grove in 1839, Pt-based catalysts were used as the most common electrode materials for the oxygen-reduction reaction (ORR). However, its deficiency and high price drive to develop new non–precious metal catalysts which are potentially less expensive and more abundant. In 1964, Jasinski observed catalytic activity of cobalt phthalocyanine to the ORR. Many methods have been tried to create practical non-precious metal catalysts (NPMCs). Many studies have shown that the reaction of the nitrogen atoms and non-precious transition metals into nano carbon materials can improve the electrocatalytic performance. Commonly, nitrogen-doped carbon materials can be fabricated by two methods: (i) directly doping during the synthesis of carbon materials and (ii) post-treatment of the as prepared carbon materials with nitrogen precursor. Especially, nitrogen and transition metal containing carbon composites fabricated via pyrolysis of precursors containing metal salts, nitrogen, and macrocyclic compounds have been demonstrated to be active in catalyzing ORR. Transition metals such as Co and Fe to improve the performance will require a robust method for increasing the reactivity of the metal ion through ligation. In this study, we sprayed graphene on carbon paper (CP) by spray method. A Cobalt (Co)-based electrocatalysts were fabricated by sputter deposition on graphene oxide layered carbon paper (GO/CP) and heat treatment in an ammonia (NH3) environment. The fabricated Co/N/Go/CP was investigated as an electrocatalyst for oxygen reduction reaction (ORR) in PEMFC by cyclic voltammetry (CV) and electrochemical Impedance spectroscopy (EIS).