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대한화학회 제124회 학술발표회 및 총회 Comparing activity of δ-MnO2 with various intercalated cation toward alkaline oxygen evolution reaction

등록일
2019년 8월 22일 15시 32분 03초
접수번호
1283
발표코드
ELEC.P-427 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 17일 (목요일) 11:00~12:30
발표형식
포스터
발표분야
Electrochemistry
저자 및
공동저자
Kahyun Ham, Jaeyoung Lee1,*
School of Earth Science and Environmental Engineering, Gwangju Institute of Science and Technology, Korea
1School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology, Korea
Hydrogen economy has got attention as renewable energy system. To produce hydrogen without the emission of carbon dioxide, water splitting intergrated solar cell is one of solution. However, high overpotential in anode and high price of catalyst inhibits its commercialization of water splitting. Manganese oxides have various redox chemistry and are thus advantage for energy storage and conversion due to its high surface area and abundance. According to recent in situ XAS results, Mn oxide turns to δ-MnO2 at 1.45 VRHE and retains their structure during OER. δ-MnO2, which is octahedral MnO6-layered structure with cations and water intercalatered into interlayer structure, has an oxidation state between III and IV and are a candidates of active phase for OER. In this study, we synthesized Birnessite-like Mn oxide with metal cations with facile sol-gel method. We also compared their OER activity in neutral and alkaline electrolyte and investigated on the role of metal cation in the oxidation state of Mn oxide.

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