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He L, Wood TE, Wu B, et al. Spatial Separation of Charge Carriers in In2O3-x(OH)y Nanocrystal Superstructures for Enhanced Gas-Phase Photocatalytic Activity. ACS Nano. 2016;10(5):5578-86doi: 10.1021/acsnano.6b02346.
He, L., Wood, T. E., Wu, B., Dong, Y., Hoch, L. B., Reyes, L. M., Wang, D., Kübel, C., Qian, C., Jia, J., Liao, K., O'Brien, P. G., Sandhel, A., Loh, J. Y., Szymanski, P., Kherani, N. P., Sum, T. C., Mims, C. A., & Ozin, G. A. (2016). Spatial Separation of Charge Carriers in In2O3-x(OH)y Nanocrystal Superstructures for Enhanced Gas-Phase Photocatalytic Activity. ACS nano, 10(5), 5578-86. https://doi.org/10.1021/acsnano.6b02346
He, Le, et al. "Spatial Separation of Charge Carriers in In2O3-x(OH)y Nanocrystal Superstructures for Enhanced Gas-Phase Photocatalytic Activity." ACS nano vol. 10,5 (2016): 5578-86. doi: https://doi.org/10.1021/acsnano.6b02346
He L, Wood TE, Wu B, Dong Y, Hoch LB, Reyes LM, Wang D, Kübel C, Qian C, Jia J, Liao K, O'Brien PG, Sandhel A, Loh JY, Szymanski P, Kherani NP, Sum TC, Mims CA, Ozin GA. Spatial Separation of Charge Carriers in In2O3-x(OH)y Nanocrystal Superstructures for Enhanced Gas-Phase Photocatalytic Activity. ACS Nano. 2016 May 24;10(5):5578-86. doi: 10.1021/acsnano.6b02346. Epub 2016 May 12. PMID: 27159793.
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ACS Nano. 2016 May 24;10(5):5578-86. doi: 10.1021/acsnano.6b02346. Epub 2016 May 12.

Spatial Separation of Charge Carriers in In2O3-x(OH)y Nanocrystal Superstructures for Enhanced Gas-Phase Photocatalytic Activity.

ACS nano

Le He, Thomas E Wood, Bo Wu, Yuchan Dong, Laura B Hoch, Laura M Reyes, Di Wang, Christian Kübel, Chenxi Qian, Jia Jia, Kristine Liao, Paul G O'Brien, Amit Sandhel, Joel Y Y Loh, Paul Szymanski, Nazir P Kherani, Tze Chien Sum, Charles A Mims, Geoffrey A Ozin

Affiliations

  1. Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University , 199 Ren'ai Road, Suzhou, Jiangsu 215123, People's Republic of China.
  2. Materials Chemistry and Nanochemistry Research Group, Solar Fuels Cluster, Center for Inorganic and Polymeric Nanomaterials, Departments of Chemistry, Chemical Engineering and Applied Chemistry, and Electrical and Computing Engineering, University of Toronto , 80 St. George Street, Toronto, Ontario M5S 3H6, Canada.
  3. Singapore-Berkeley Research Initiative for Sustainable Energy (SinBeRISE) , 1 Create Way, Singapore 138602.
  4. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , 21 Nanyang Link, Singapore 637371.
  5. Institute of Nanotechnology and Karlsruhe Nano Micro Facility, Karlsruhe Institute of Technology , Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
  6. Laser Dynamics Laboratory, School of Chemistry and Biochemistry, Georgia Institute of Technology , 901 Atlantic Drive NW, Atlanta, Georgia 30332, United States.

PMID: 27159793 DOI: 10.1021/acsnano.6b02346

Abstract

The development of strategies for increasing the lifetime of photoexcited charge carriers in nanostructured metal oxide semiconductors is important for enhancing their photocatalytic activity. Intensive efforts have been made in tailoring the properties of the nanostructured photocatalysts through different ways, mainly including band-structure engineering, doping, catalyst-support interaction, and loading cocatalysts. In liquid-phase photocatalytic dye degradation and water splitting, it was recently found that nanocrystal superstructure based semiconductors exhibited improved spatial separation of photoexcited charge carriers and enhanced photocatalytic performance. Nevertheless, it remains unknown whether this strategy is applicable in gas-phase photocatalysis. Using porous indium oxide nanorods in catalyzing the reverse water-gas shift reaction as a model system, we demonstrate here that assembling semiconductor nanocrystals into superstructures can also promote gas-phase photocatalytic processes. Transient absorption studies prove that the improved activity is a result of prolonged photoexcited charge carrier lifetimes due to the charge transfer within the nanocrystal network comprising the nanorods. Our study reveals that the spatial charge separation within the nanocrystal networks could also benefit gas-phase photocatalysis and sheds light on the design principles of efficient nanocrystal superstructure based photocatalysts.

Keywords: charge separation; gas phase; metal oxide semiconductor; nanocrystal superstructures; photocatalysis

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