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제126회 대한화학회 학술발표회 및 총회 Integrating Heteromixtured Cu2O/CuO Photocathode Interface through a Hydrogen Treatment for Photoelectrochemical Hydrogen Evoluation Reaction

등록일
2020년 9월 18일 18시 10분 19초
접수번호
1189
발표코드
ELEC.P-530 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 21일(수) 17:00~17:30
발표형식
포스터
발표분야
Electrochemistry
저자 및
공동저자
Young Jun Seo, Soon Hyung Kang1,*
Department of Chemistry Education, Chonnam National University, Korea
1Department of Chemical Education, Chonnam National University, Korea
Cu2O and CuO is a potential semiconductor photocathode with the demonstrated hydrogen production capability. In this work, CuO nanowires were formed on Cu foil substrate by the electrochemical anodization process by immersing them into the alkaline solution under constant current. Despite of the numerous attempts to develop copper oxide heterojunctions via a bottom-up approach, the resulting composites have been suffered from the poor interfacial modulation. However, the intimate modulation through the different ambient annealing of photocathodes could alter the nanostructure, light harvesting, and optical bandgap. Herein, the Cu transforms to Cu(OH)2 by the electrochemical anodization, subsequently transformed to CuO rich Cu2O/CuO composite in air-annealing process. In addition, for the surface engineering of CuO phases, the post-annealing process under the 4% hydrogen-argon mixed gas at 300 °C was performed. As a result, a mild hydrogen treatment (1 min) was found to be effective in enhancing the PEC properties due to the favorable Cu2O/CuO/Cu2O formation, promoting the photogenerated charge separation, the generation of the sufficient cation vacancies closely relating to the electronic conductivity, and the charge-transfer yield. From the XRD and XPS results, it was confirmed that the area of Cu2O has increased by the hydrogen treatment, proving that a slightly thin Cu2O layer was produced from the inherent reduction of prominent CuO phase to modulate as Cu2O/CuO/Cu2O. Overall, the Cu2O/CuO/Cu2O (H2@1min) film exhibited an obvious improvement in photocurrent density of -2.3 mA/cm2 at 0 V vs. reversible hydrogen electrode (RHE)(briefly abbreviated as 0 VRHE) than those nanowires having -1.72 mA/cm2 and -1.44 mA/cm2 of both Cu2O/CuO/Cu (H2@3min) and Cu2O/CuO (Air).

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