Metal-Free Artificial Photosynthesis of Carbon Monoxide Using N-Doped ZnTe Nanorod Photocathode Decorated with N-Doped Carbon Electrocatalyst Layer
- Authors
- Jang, Youn Jeong; Bhatt, Mahesh Datt; Lee, Jaehyuk; Choi, Sun Hee; Lee, Byeong Jun; Lee, Jae Sung
- Issue Date
- Jul-2018
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- artificial photosynthesis; N-doped carbon electrocatalysts; photoelectrochemical CO2 reduction; zinc telluride photocathode
- Citation
- ADVANCED ENERGY MATERIALS, v.8, no.20, pp.1 - 8
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED ENERGY MATERIALS
- Volume
- 8
- Number
- 20
- Start Page
- 1
- End Page
- 8
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/16809
- DOI
- 10.1002/aenm.201702636
- ISSN
- 1614-6832
- 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-H-2 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 V-RHE), CO selectivity (dominant CO production of approximate to 72%), minor H-2 reduction (approximate to 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.
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