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Lee, Jae Sung
Eco-friendly Catalysis and Energy Lab
Research Interests
  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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Metal-Free Artificial Photosynthesis of Carbon Monoxide Using N-Doped ZnTe Nanorod Photocathode Decorated with N-Doped Carbon Electrocatalyst Layer

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Title
Metal-Free Artificial Photosynthesis of Carbon Monoxide Using N-Doped ZnTe Nanorod Photocathode Decorated with N-Doped Carbon Electrocatalyst Layer
Author
Jang, Youn JeongBhatt, Mahesh DattLee, JaehyukChoi, Sun HeeLee, Byeong JunLee, Jae Sung
Keywords
artificial photosynthesis; N‐ doped carbon electrocatalysts; photoelectrochemical CO 2 reduction; zinc telluride photocathode
Issue Date
201807
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED ENERGY MATERIALS, v.8, no.20, pp.1702636 -
Abstract
An artificial photosynthesis system based on N-doped ZnTe nanorods decorated with an N-doped carbon electrocatalyst layer is fabricated via an all-solution process for the selective conversion of CO2 to CO. Substitutional N-doping into the ZnTe lattice decreases the bandgap slightly and improves the charge transfer characteristics, leading to enhanced photoelectrochemical activity. Remarkable N-doping effects are also demonstrated by the N-doped carbon layer that promotes selective CO2-to-CO conversion instead of undesired water-to-H2 reduction by providing active sites for CO2 adsorption and activation, even in the absence of metallic redox centers. The photocathode shows promising performance in photocurrent generation (-1.21 mA cm-2 at -0.11 VRHE), CO selectivity (dominant CO production of ≈72%), minor H2 reduction (≈20%), and stability (corrosion suppression). The metal-free electrocatalyst/photocatalyst combination prepared via a cost-effective solution process exhibits high performance due to synergistic effects between them, and thus may find application in practical solar fuel production.
URI
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DOI
http://dx.doi.org/10.1002/aenm.201702636
ISSN
1614-6832
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