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All-in-One Synthesis of Mesoporous Silicon Nanosheets from Natural Clay and Their Applicability in Hydrogen Evolutionopen access

Authors
Ryu, JaegeonJang, Youn JeongChoi, SinhoKang, Hyun JoonPark, HyungminLee, Jae SungPark, 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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