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Ni-doped ZnCo2O4 atomic layers to boost the selectivity in solar-driven reduction of CO2
- Source :
- Nano Research. 11:2897-2908
- Publication Year :
- 2018
- Publisher :
- Springer Science and Business Media LLC, 2018.
-
Abstract
- Regulating the selectivity of CO2 photoreduction is particularly challenging. Herein, we propose ideal models of atomic layers with/without element doping to investigate the effect of doping engineering to tune the selectivity of CO2 photoreduction. Prototypical ZnCo2O4 atomic layers with/without Ni-doping were first synthesized. Density functional theory calculations reveal that introducing Ni atoms creates several new energy levels and increases the density-of-states at the conduction band minimum. Synchrotron radiation photoemission spectroscopy demonstrates that the band structures are suitable for CO2 photoreduction, while the surface photovoltage spectra demonstrate that Ni doping increases the carrier separation efficiency. In situ diffuse reflectance Fourier transform infrared spectra disclose that the CO2·− radical is the main intermediate, while temperature-programed desorption curves reveal that the ZnCo2O4 atomic layers with/without Ni doping favor the respective CO and CH4 desorption. The Ni-doped ZnCo2O4 atomic layers exhibit a 3.5-time higher CO selectivity than the ZnCo2O4 atomic layers. This work establishes a clear correlation between elemental doping and selectivity regulation for CO2 photoreduction, opening new possibilities for tailoring solar-driven photocatalytic behaviors.
- Subjects :
- Materials science
Photoemission spectroscopy
Surface photovoltage
Doping
Analytical chemistry
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Atomic and Molecular Physics, and Optics
0104 chemical sciences
Desorption
Photocatalysis
General Materials Science
Density functional theory
Diffuse reflection
Electrical and Electronic Engineering
0210 nano-technology
Selectivity
Subjects
Details
- ISSN :
- 19980000 and 19980124
- Volume :
- 11
- Database :
- OpenAIRE
- Journal :
- Nano Research
- Accession number :
- edsair.doi...........b09d9aab38490af4fd89d13578b27788