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Your search keyword '"Kohlstedt, Kevin L."' showing total 8 results
Start Over Author "Kohlstedt, Kevin L." Journal journal of the american chemical society
8 results on '"Kohlstedt, Kevin L."'

2. Control over Charge Separation by Imine Structural Isomerization in Covalent Organic Frameworks with Implications on CO2Photoreduction

Author

Streater, Daniel H., Kennehan, Eric R., Wang, Denan, Fiankor, Christian, Chen, Liangji, Yang, Chongqing, Li, Bo, Liu, Daohua, Ibrahim, Faysal, Hermans, Ive, Kohlstedt, Kevin L., Luo, Long, Zhang, Jian, and Huang, Jier

Abstract

Two-dimensional covalent organic frameworks (COFs) are an emerging class of photocatalytic materials for solar energy conversion. In this work, we report a pair of structurally isomeric COFs with reversed imine bond directions, which leads to drastic differences in their physical properties, photophysical behaviors, and photocatalytic CO2reduction performance after incorporating a Re(bpy)(CO)3Cl molecular catalyst through bipyridyl units on the COF backbone (Re-COF). Using the combination of ultrafast spectroscopy and theory, we attributed these differences to the polarized nature of the imine bond that imparts a preferential direction to intramolecular charge transfer (ICT) upon photoexcitation, where the bipyridyl unit acts as an electron acceptor in the forward imine case (f-COF) and as an electron donor in the reverse imine case (r-COF). These interactions ultimately lead the Re-f-COF isomer to function as an efficient CO2reduction photocatalyst, while the Re-r-COF isomer shows minimal photocatalytic activity. These findings not only reveal the essential role linker chemistry plays in COF photophysical and photocatalytic properties but also offer a unique opportunity to design photosensitizers that can selectively direct charges.

Published
2024
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3. Systematic Merging of Nonfullerene Acceptor π-Extension and Tetrafluorination Strategies Affords Polymer Solar Cells with >16% Efficiency

Author

Li, Guoping, primary, Zhang, Xiaohua, additional, Jones, Leighton O., additional, Alzola, Joaquin M., additional, Mukherjee, Subhrangsu, additional, Feng, Liang-wen, additional, Zhu, Weigang, additional, Stern, Charlotte L., additional, Huang, Wei, additional, Yu, Junsheng, additional, Sangwan, Vinod K., additional, DeLongchamp, Dean M., additional, Kohlstedt, Kevin L., additional, Wasielewski, Michael R., additional, Hersam, Mark C., additional, Schatz, George C., additional, Facchetti, Antonio, additional, and Marks, Tobin J., additional

Published
2021
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4. Crystallography, Morphology, Electronic Structure, and Transport in Non-Fullerene/Non-Indacenodithienothiophene Polymer:Y6 Solar Cells

Author

Zhu, Weigang, primary, Spencer, Austin P., additional, Mukherjee, Subhrangsu, additional, Alzola, Joaquin M., additional, Sangwan, Vinod K., additional, Amsterdam, Samuel H., additional, Swick, Steven M., additional, Jones, Leighton O., additional, Heiber, Michael C., additional, Herzing, Andrew A., additional, Li, Guoping, additional, Stern, Charlotte L., additional, DeLongchamp, Dean M., additional, Kohlstedt, Kevin L., additional, Hersam, Mark C., additional, Schatz, George C., additional, Wasielewski, Michael R., additional, Chen, Lin X., additional, Facchetti, Antonio, additional, and Marks, Tobin J., additional

Published
2020
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5. Photovoltaic Blend Microstructure for High Efficiency Post-Fullerene Solar Cells. To Tilt or Not To Tilt?

Author

Wang, Gang, primary, Swick, Steven M., additional, Matta, Micaela, additional, Mukherjee, Subhrangsu, additional, Strzalka, Joseph W., additional, Logsdon, Jenna Leigh, additional, Fabiano, Simone, additional, Huang, Wei, additional, Aldrich, Thomas J., additional, Yang, Tony, additional, Timalsina, Amod, additional, Powers-Riggs, Natalia, additional, Alzola, Joaquin M., additional, Young, Ryan M., additional, DeLongchamp, Dean M., additional, Wasielewski, Michael R., additional, Kohlstedt, Kevin L., additional, Schatz, George C., additional, Melkonyan, Ferdinand S., additional, Facchetti, Antonio, additional, and Marks, Tobin J., additional

Published
2019
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