Black Si Photocathode with a Conformal and Amorphous MoSx Catalytic Layer Grown Using Atomic Layer Deposition for Photoelectrochemical Hydrogen Evolution
- Title
- Black Si Photocathode with a Conformal and Amorphous MoSx Catalytic Layer Grown Using Atomic Layer Deposition for Photoelectrochemical Hydrogen Evolution
- Author
- 박태주
- Keywords
- photoelectrochemical cell; hydrogen evolution; black Si; amorphous MoSx; atomic layer deposition
- Issue Date
- 2022-03
- Publisher
- American Chemical Society
- Citation
- ACS Applied Materials and Interfaces, v. 14, NO. 12, Page. 14137-14145
- Abstract
- We demonstrated how the photoelectrochemical (PEC) performance was enhanced by conformal deposition of an amorphous molybdenum sulfide (a-MoSx) thin film on a nano-structured surface of black Si using atomic layer deposition (ALD). The a-MoSx is found to predominantly consist of an octahedral structure (S-deficient metallic phase) that exhibits high electrocatalytic activity for the hydrogen evolution reaction with a Tafel slope of 41 mV/dec in an acid electrolyte. The a-MoSx has a smaller work function (4.0 eV) than that of crystalline 2H-MoS2 (4.5 eV), which induces larger energy band bending at the p-Si surface, thereby facilitating interface charge transfer. These features enabled us to achieve an outstanding kinetic overpotential of similar to 0.2 V at 10 mA/cm(2) and an onset potential of 0.27 V at 1 mA/cm(2). Furthermore, the a-MoSx layer provides superior protection against corrosion of the Si surface, enabling long-term PEC operation of more than 50 h while maintaining 87% or more performance. This work highlights the remarkable advantages of the ALD a-MoSx layer and leads to a breakthrough in the architectural design of PEC cells to ensure both high performance and stability.
- URI
- https://pubs.acs.org/doi/10.1021/acsami.1c22273https://repository.hanyang.ac.kr/handle/20.500.11754/181539
- ISSN
- 1944-8244;1944-8252
- DOI
- 10.1021/acsami.1c22273
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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