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제125회 대한화학회 학술발표회 및 총회 Enhancing activity and stability of cobalt oxide electrocatalysts for the oxygen evolution reaction

등록일
2020년 2월 6일 14시 56분 42초
접수번호
0968
발표코드
ELEC.P-916 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
온라인 PDF 제출
발표형식
포스터
발표분야
Electrochemistry
저자 및
공동저자
Haeun Jung, Ki min Nam*
Department of Chemistry, Pusan National University, Korea
Developing highly-active, low-cost and durable electrocatalysts for the oxygen evolution reaction (OER) is critical for the sustainable electrochemical water splitting. In recent years, many earth-abundant metal oxides have been investigated as potential OER catalysts to replace expensive Ir- and Ru-based compounds. Among all the catalysts, cobalt-based materials exhibited excellent activities in water oxidation reaction through electrocatalytic approaches. Especially, the meta-stable h-CoO phase has attracted great interest because it involves various fundamental themes of materials chemistry. In this study, a series of cobalt based electrocatalysts have been prepared by solvothermal methods. Phase transformation of h-CoO into various cobalt structures (Co(OH)2, c-CoO, CoOOH and Co3O4) have been fully investigated. For the OER, Co3O4 showed the best electrocatalytic activity followed by Co(OH)2, c-CoO, CoOOH. Furthermore, the Co3O4 deposition occurred on the various substrates (glassy carbon, fluorine-doped tin oxide, Ti-foil) via phase transitions without any additional deposition processes (binder-free catalyst). The phase transitioned Co3O4 catalyst exhibits significantly enhanced activity and durability compared to the commercial Co3O4 catalyst.

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