1. Boosting Photocatalytic Hydrogen Production by Modulating Recombination Modes and Proton Adsorption Energy
- Author
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Pedram Tavadze, Tengfeng Xie, J. W. Hans Niemantsverdriet, Rishmali Sooriyagoda, Yitao Dai, Bo B. Iversen, Ren Su, Yongwang Li, Aref Mamakhel, Nina Lock, Alan D. Bristow, James P. Lewis, Yanbin Shen, Tingbin Lim, Qijing Bu, Xiaoping Wang, Olivia Pavlic, and Flemming Besenbacher
- Subjects
EFFICIENCY ,Boosting (machine learning) ,Materials science ,Proton ,CRYSTALLINE G-C3N4 ,02 engineering and technology ,QUANTUM DOTS ,010402 general chemistry ,CDS ,01 natural sciences ,NANOPARTICLES ,Radiative transfer ,General Materials Science ,Physical and Theoretical Chemistry ,CARBON NITRIDE PHOTOCATALYST ,Hydrogen production ,business.industry ,ELECTRON INJECTION ,Charge (physics) ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Renewable energy ,Chemical physics ,Photocatalysis ,COCATALYSTS ,0210 nano-technology ,business ,CHARGE SEPARATION ,Recombination ,GENERATION - Abstract
Solar-driven production of renewable energy (e.g., H2) has been investigated for decades. To date, the applications are limited by low efficiency due to rapid charge recombination (both radiative and nonradiative modes) and slow reaction rates. Tremendous efforts have been focused on reducing the radiative recombination and enhancing the interfacial charge transfer by engineering the geometric and electronic structure of the photocatalysts. However, fine-tuning of nonradiative recombination processes and optimization of target reaction paths still lack effective control. Here we show that minimizing the nonradiative relaxation and the adsorption energy of photogenerated surface-adsorbed hydrogen atoms are essential to achieve a longer lifetime of the charge carriers and a faster reaction rate, respectively. Such control results in a 16-fold enhancement in photocatalytic H2 evolution and a 15-fold increase in photocurrent of the crystalline g-C3N4 compared to that of the amorphous g-C3N4.
- Published
- 2019