Leaf-inspired highly efficient and stable photocatalyst for $CO_2$ conversion = 나뭇잎 구조 모사를 통한 고 효율 고 안정성 이산화탄소 환원 광촉매의 개발 및 특성

Cited 0 time in webofscience Cited 0 time in scopus
  • Hit : 610
  • Download : 0
A leaf adopts to natural photosynthesis based on the unique structural and chemical strategies. Structurally, sponge cells in the leaf trigger light scattering and offer efficient gas diffusion and adsorp-tion pathway. Chemically, leaf’s unique catalytic system, so called a Z-scheme, could generate photoex-cited electrons at one chlorophyll (P680) and transport them via electron transfer channel (Cytochrome $b_6f$ complex) to the other chlorophyll (P700) in order to increase product yield and selectivity. Here, we created a leaf-inspired highly stable metal-free photocatalyst, consisting of few layered molybdenum disulfide ($MoS_2$) and mesoporous titanium dioxide ($TiO_2$) on graphene aerogel. Similar to the sponge cells, graphene aerogel structures and mesoporous $TiO_2$ nanoparticles imitate hierarchical architecture of a leaf to increase mass transportation and light absorption. Also, the artificial Z-scheme is construct-ed by precisely controlled energy pathway from $TiO_2$ via graphene to few layered $MoS_2$, which improve charge transfer, redox power of carriers, and broad light absorption range. The resulting artificial leaf photocatalyst shows robust stability and outstanding photocatalytic activity ($92.33 \mu mol CO /g \cdot h$) ca. 15 times higher than bare $TiO_2$, which highly efficient performances than those of metal-based catalysts.
Advisors
Jung, Hee-Taeresearcher정희태researcher
Description
한국과학기술원 :생명화학공학과,
Publisher
한국과학기술원
Issue Date
2016
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 생명화학공학과, 2016.2 ,[iv, 35 p. :]

Keywords

Photocatalyst; CO2 conversion; leaf-mimic; Z-scheme; 광촉매; 이산화탄소 환원; 나뭇잎 모사

URI
http://hdl.handle.net/10203/221532
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=649490&flag=dissertation
Appears in Collection
CBE-Theses_Master(석사논문)
Files in This Item
There are no files associated with this item.

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0