120th General Meeting of the KCS

Type Poster Presentation
Area Inorganic Chemistry
Room No. Exhibition Hall 2+3
Time 10월 19일 (목요일) 11:00~12:30
Code INOR.P-46
Subject Highly N-doped Nanoporous Carbon Spheres Derived from Melanin-like Polymer and Biopolymer for CO2 absorbents and Oxygen Reduction Reaction (ORR) catalysts
Authors Hee Soo Kim, Min seok Kang, Won Cheol Yoo*
Department of Applied Chemistry, Hanyang University, Korea
Abstract Among carbon dioxide (CO2) capture materials, activated carbon materials have been of great interest owing to low cost, high chemical and thermal stability, and strong property to humidity. Trying to increase adsorption capacity for CO2 using activated carbon materials, increase of ultramicropore (<1nm) and incorporation of nitrogen into the carbon frameworks have been proved as the most important factors. In this section, we report how monodisperse melanin polymer and sepia polymer spheres with size ranged from 100 to 500 nm can be synthesized using dopamine precursor and extracted from squid meongmullang that contains nitrogen in their chemical structure. As-prepared and N-enriched melanin polymer and sepia spheres were then carbonized to provide N-doped carbon with a good monodispersity and its nitrogen content was as high as 12 wt%. In addition, CO2 activation process that increases the specific surface areas of N-doped carbon was applied and a steady increase of surface areas were controlled up to around 2700 m2/g. Highly activated and N-doped carbon was then used for CO2 capture absorbents (7.83 mmol/g at 273K). As a Oxygen Reduction Reaction (ORR) catalyst increasing porosity and specific surface areas, the ORR performances were enhanced due to improved mass transports and increased active sites. The most developed catalyst with the largest surface area (2677 m2/g : Melanin carbon (MC), 2506 m2/g : Sepia carbon (SC) ) and pore volume (MC : 1.72 cm3/g, SC: 1.47 cm3/g) showed comparable ORR performance to commercial Pt catalyst.
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