Order engineering on the lattice of intermetallic PdCu co-catalysts for boosting the photocatalytic conversion of CO2 into CH4
| Autor: | Jianrong Chen, Yuling Zhao, Ruoxin Wang, Xiaotong Cai, Lanju Wu, Jiawei Wang, An Wang, Shuxian Zhong, Song Bai |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Annealing (metallurgy) Alloy Rational design Intermetallic 02 engineering and technology General Chemistry engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis Chemical engineering Lattice (order) Photocatalysis engineering General Materials Science 0210 nano-technology Selectivity |
| Zdroj: | Journal of Materials Chemistry A. 6:17444-17456 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/c8ta06204h |
| Popis: | Photocatalytic conversion of CO2 to CH4, a promising approach to reduce the depletion of fossil fuels and concomitant global warming, is greatly limited by the production of CO and H2 by side reactions. Rational design of co-catalysts holds promise to address this grand challenge. In this paper, via the transformation from a random A1 alloy phase to an ordered B2 intermetallic phase, order engineering is performed on PdCu co-catalysts to realize enhanced photocatalytic activity and selectivity in reduction of CO2 with H2O to CH4. Based on the experimental results of PdCu co-catalysts with different ordered degrees of atomic arrangement obtained through tuning the annealing temperatures and Pd/Cu molar ratios, two effects are proposed to contribute to this enhancement: (1) the strong electronic interaction between Pd and Cu atoms in the periodic structure increases the electron trapping ability of ordered PdCu co-catalysts; (2) the periodic structure increases the number of isolated Cu atoms in the ordered PdCu co-catalysts, which act as highly active catalytic sites in the reduction of CO2 to CH4. This work represents a step toward the design of high-performance photocatalysts through lattice engineering of the co-catalysts with atomic precision. |
| Databáze: | OpenAIRE |
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