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제125회 대한화학회 학술발표회 및 총회 Nickel Sulfide/Silicon Nanowire Photocatalysts for Light-Driven Hydrogen Evolution Reation

등록일
2020년 2월 6일 14시 49분 14초
접수번호
0934
발표코드
MAT.P-809 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
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발표형식
포스터
발표분야
Material Chemistry
저자 및
공동저자
Jisun Yoo, In Hye Kwak1, Ik Seon Kwon, Doyeon Kim, Jong Hyun Lee, SooA Lim2, Jeunghee Park3,*
Advanced Materials Chemistry, Korea University, Korea
1Micro Device Engineering / Microdevices, Korea University, Korea
2Dept. of Phamaceutical engineering, Hoseo University, Korea
3Department of Materials Chemistry, Korea University, Korea
Photoelectrochemical water splitting has been considered as the most promising technology for generating hydrogen energy. Herein, we report nickel sulfide nanocrystals (NCs) as excellent catalysts for solar-driven photoelectrochemical (PEC) hydrogen evolution. Photocathodes were fabricated by growing the NiS and NiS1.97 NCs with controlled composition directly onto Si nanowire (NW) arrays. The deposition of NiS NCs results in excellent PEC performance in 0.5 M H2SO4 and 1 M KOH; the photocurrent is 10 mA cm-2 and the onset potential is 0.2 V. In contrast, the Si-NiS1.97 photocathode exhibit much lower photocurrent and less stability. Detailed structure analysis using X-ray photoelectron spectroscopy reveals that the NiS is more metallic than the NiS1.97 and retains the same electronic structures during the PEC reaction. Separate NiS and NiS1.97 NCs without Si NWs were also synthesized, and the former showed higher electrocatalytic activity toward the hydrogen/oxygen evolution reactions. The high catalytic activity of metallic NiS NCs should be the main cause of this enhanced PEC performance, promising efficient water-splitting Si-based PEC cells.

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