All-in-One Synthesis of Mesoporous Silicon Nanosheets from Natural Clay and Their Applicability in Hydrogen Evolutionopen access
- Authors
- Ryu, Jaegeon; Jang, Youn Jeong; Choi, Sinho; Kang, Hyun Joon; Park, Hyungmin; Lee, Jae Sung; Park, Soojin
- Issue Date
- Mar-2016
- Publisher
- NATURE PUBLISHING GROUP
- Citation
- NPG ASIA MATERIALS, v.8, pp.1 - 9
- Indexed
- SCIE
SCOPUS
- Journal Title
- NPG ASIA MATERIALS
- Volume
- 8
- Start Page
- 1
- End Page
- 9
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/23868
- DOI
- 10.1038/am.2016.35
- ISSN
- 1884-4049
- Abstract
- Silicon nanosheets have attracted much attention owing to their novel electronic and optical properties and compatibility with existing silicon technology. However, a cost-effective and scalable technique for synthesizing these nanosheets remains elusive. Here, we report a novel strategy for producing silicon nanosheets on a large scale through the simultaneous molten-salt-induced exfoliation and chemical reduction of natural clay. The silicon nanosheets thus synthesized have a high surface area, are ultrathin (similar to 5 nm) and contain mesoporous structures derived from the oxygen vacancies in the clay. These advantages make the nanosheets a highly suitable photocatalyst with an exceptionally high activity for the generation of hydrogen from a water-methanol mixture. Further, when the silicon nanosheets are combined with platinum as a cocatalyst, they exhibit high activity in KOH (15.83 mmol H-2 per s per mol Si) and excellent photocatalytic activity with respect to the evolution of hydrogen from a water-methanol mixture (723 mu mol H-2 per h per g Si).
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