Metal-Free Artificial Photosynthesis of Carbon Monoxide Using N-Doped ZnTe Nanorod Photocathode Decorated with N-Doped Carbon Electrocatalyst Layer
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- Metal-Free Artificial Photosynthesis of Carbon Monoxide Using N-Doped ZnTe Nanorod Photocathode Decorated with N-Doped Carbon Electrocatalyst Layer
- Jang, Youn Jeong; Bhatt, Mahesh Datt; Lee, Jaehyuk; Choi, Sun Hee; Lee, Byeong Jun; Lee, Jae Sung
- Issue Date
- WILEY-V C H VERLAG GMBH
- ADVANCED ENERGY MATERIALS, v., no., pp. -
- 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.
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