| 학회 | 한국재료학회 |
| 학술대회 | 2018년 봄 (05/16 ~ 05/18, 삼척 쏠비치 호텔&리조트) |
| 권호 | 24권 1호 |
| 발표분야 | E. 환경/센서 재료 분과 |
| 제목 | Atomically thin heterojunction catalysts for efficient photoelectrochemical hydrogen production |
| 초록 | Two-dimensional (2D) semiconductors such as MoS2 and WS2 have emerged as a promising nonprecious and earth-abundant catalyst for photoelectrochemical (PEC) water splitting. Recently, considerable research efforts have focsed on identifying the active sites as atomic edges and vacancies in those layered materials and activiting (or maximizing) such catalytic sites for efficient hydrogen evolution reaction (HER). In addition, the ability to create atomically thin 2D semiconductor heterostructures with designed energy alignment provide unpreceedented possibilities in photocatalysis by controlling the chemical reactivity and charge transfer at the solid-liquid interface. Nevertheless, it is difficult to investigate the HER mechanism and to correlate PEC performance with the specific properties of the heterostructures because of ensemble averaging efforts of various catalytic sites including step edges, vacancies, grain bundaries and chemical adsorbates present inhomogeneously on the surface. Here, we will present a new method for spatially-resolved and in-situ PEC characterization in 2D semiconductors and their heterostucutres. For the measurement, a model system consisting of MoS2/WS2/WSe2/Graphene heterostructures is fabricated within the miniaturized PEC cell using cdW assembly and micro-patterning techniques. By measuring the photocurrent upon scanning the focused laser spot, we could characterize the PEC performance of heterojunction compared with individual MoS2 or WS2 layers. Furthermore, the electrical field effect on HER of such a unique heterostructure will be disscussed. |
| 저자 | 이재윤1, 강성우2, 이동훈1, 최수호3, 양승훈1, 김윤석1, 최석훈2, 권기창2, 박해리1, 허웅1, 강희성1, 김수민4, 한승우2, 장호원2, 이철호1 |
| 소속 | 1고려대, 2서울대, 3동국대 물리학과, 4KIST |
| 키워드 | <P>Solar water splitting; photocatalyst; 2D materials; transition metal dichalcogenides; 2D heterostructures</P> |
