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  • 09월 10일 16시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제124회 대한화학회 학술발표회, 총회 및 기기전시회 안내 NiO as Back Ohmic Contact Hole Transport Layer to p-type doped CuBi2O4 for Photoelectrochemical Water Splitting

2019년 9월 9일 12시 28분 11초
PHYS.P-227 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 17일 (목요일) 11:00~12:30
Physical Chemistry
저자 및
Madhusudana Gopannagari, Yujin Kim, Tae Kyu Kim*
Department of Chemistry, Yonsei University, Korea
Electrochemical synthesis methods were developed to produce CuBi2O4 (CBO), a promising p-type oxide for use in solar water splitting, as high surface area electrodes due to its optimal optical band gap and positive photocurrent onset potential. However, despite these favorable attributes, CBO photocathodes have shown limitations in charge carrier transport within CBO and across the interface with n-type fluorine doped tin oxide (FTO). To overcome this both limitations, a very thin NiO layer inserted between the FTO and CBO, since the importance of NiO is recently described as one of the capable hole transfer layers (HTL) for its hole transport property, stable electrode, easy process to form thinfilm and helps to full coverage deposition of CBO. In addition to that, Ag-doped CBO electrodes were also prepared by adding a trace amount of Ag+ in the plating medium and co-depositing Ag with the Cu/Bi films. In the Ag-doped CBO, Ag+ ions substitutionally replaced Bi3+ ions and increased the hole concentration in CBO. The utilization of NiO as an ohmic back contact to hole concentration increased Ag-CBO material achieved a positive onset potential of 1.16 V vs RHE and observed twofold improvement in current density. And, the photostability recover experiments were compared and studied with addition of protecting layer on surface. Prepared photoelectrodes optical and structural properties were examined well. This study offers new thoughtful for building progressed CBO photocathodes by thoroughly investigating photocorrosion as well as photoelectrochemical performance of high-quality CBO and Ag-doped CBO (ACBO) photoelectrodes for water splitting reactions.