Hydrogenated nanotubes/nanowires assembled from TiO2 nanoflakes with exposed {111} facets: excellent photo-catalytic CO2 reduction activity and charge separation mechanism between (111) and (1̄1̄1̄) polar surfaces

2019 ◽  
Vol 7 (24) ◽  
pp. 14761-14775 ◽  
Author(s):  
Junfang Liu ◽  
Bin Liu ◽  
Yan Ren ◽  
Yukun Yuan ◽  
Hua Zhao ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Charge Separation ◽  
Co2 Reduction ◽  
Separation Mechanism ◽  
Apparent Quantum Yield ◽  
Reduction Activity ◽  
Polar Surfaces

The apparent quantum yield for CH4 evolution of the hydrogenated TiO2 nanotubes/nanowires is as high as 17.4%, which is higher than that of all the TiO2 based photocatalysts reported until now.

scholarly journals Photocatalytic CO2 reduction of C/ZnO nanofibers enhanced by an Ni-NiS cocatalyst

Nanoscale ◽  
2020 ◽  
Vol 12 (13) ◽  
pp. 7206-7213 ◽  
Author(s):  
Hongzhao Deng ◽  
Feiyan Xu ◽  
Bei Cheng ◽  
Jiaguo Yu ◽  
Wingkei Ho
Keyword(s):  
Light Absorption ◽  
Charge Separation ◽  
Effective Charge ◽  
Co2 Reduction ◽  
Reduction Activity ◽  
Zno Nanofibers

Photocatalyst Ni-NiS/C/ZnO shows improved photocatalytic CO2-reduction activity due to enhanced light absorption, good CO2 adsorption and effective charge separation.

scholarly journals Excitonic structure and charge separation in the heliobacterial reaction center probed by multispectral multidimensional spectroscopy

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yin Song ◽  
Riley Sechrist ◽  
Hoang H. Nguyen ◽  
William Johnson ◽  
Darius Abramavicius ◽  
...  
Keyword(s):  
Reaction Center ◽  
Charge Separation ◽  
Electronic Spectroscopy ◽  
Spectroscopic Studies ◽  
Primary Electron ◽  
Reaction Centers ◽  
Separation Mechanism ◽  
Photosynthetic Reaction Centers ◽  
Density Analysis ◽  
Function Relationship

AbstractPhotochemical reaction centers are the engines that drive photosynthesis. The reaction center from heliobacteria (HbRC) has been proposed to most closely resemble the common ancestor of photosynthetic reaction centers, motivating a detailed understanding of its structure-function relationship. The recent elucidation of the HbRC crystal structure motivates advanced spectroscopic studies of its excitonic structure and charge separation mechanism. We perform multispectral two-dimensional electronic spectroscopy of the HbRC and corresponding numerical simulations, resolving the electronic structure and testing and refining recent excitonic models. Through extensive examination of the kinetic data by lifetime density analysis and global target analysis, we reveal that charge separation proceeds via a single pathway in which the distinct A0 chlorophyll a pigment is the primary electron acceptor. In addition, we find strong delocalization of the charge separation intermediate. Our findings have general implications for the understanding of photosynthetic charge separation mechanisms, and how they might be tuned to achieve different functional goals.

scholarly journals Carbon Nanodots as a Potential Transport Layer for Boosting Performance of All-Inorganic Perovskite Nanocrystals-based Photodetector

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 717
Author(s):  
Hassan Algadi ◽  
Ahmad Umar ◽  
Hasan Albargi ◽  
Turki Alsuwian ◽  
Sotirios Baskoutas
Keyword(s):  
Charge Separation ◽  
High Performance ◽  
Band Alignment ◽  
Transport Layer ◽  
Carbon Nanodots ◽  
Separation Mechanism ◽  
Perovskite Layer ◽  
Inorganic Perovskite ◽  
Highly Efficient ◽  
Efficient Charge

A low-cost and simple drop-casting method was used to fabricate a carbon nanodot (C-dot)/all-inorganic perovskite (CsPbBr3) nanosheet bilayer heterojunction photodetector on a SiO2/Si substrate. The C-dot/perovskite bilayer heterojunction photodetector shows a high performance with a responsivity (R) of 1.09 A/W, almost five times higher than that of a CsPbBr3-based photodetector (0.21 A/W). In addition, the hybrid photodetector exhibits a fast response speed of 1.318/1.342 µs and a highly stable photocurrent of 6.97 µA at 10 V bias voltage. These figures of merits are comparable with, or much better than, most reported perovskite heterojunction photodetectors. UV–Vis absorption and photoluminescent spectra measurements reveal that the C-dot/perovskite bilayer heterojunction has a band gap similar to the pure perovskite layer, confirming that the absorption and emission in the bilayer heterojunction is dominated by the top layer of the perovskite. Moreover, the emission intensity of the C-dot/perovskite bilayer heterojunction is less than that of the pure perovskite layer, indicating that a significant number of charges were extracted by the C-dot layer. The studied band alignment of the C-dots and perovskites in the dark and under emission reveals that the photodetector has a highly efficient charge separation mechanism at the C-dot/perovskite interface, where the recombination rate between photogenerated electrons and holes is significantly reduced. This highly efficient charge separation mechanism is the main reason behind the enhanced performance of the C-dot/perovskite bilayer heterojunction photodetector.

Direct Z-scheme Sn-In2O3/In2S3 heterojunction nanostructures for enhanced photocatalytic CO2 reduction activity

2021 ◽  
Author(s):  
Yinyi Ma ◽  
Zemin Zhang ◽  
Xiao Jiang ◽  
Rongke Sun ◽  
Mingzheng Xie ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Environmental Pollution ◽  
Light Absorption ◽  
Co2 Reduction ◽  
Photocatalytic Reduction ◽  
Practical Significance ◽  
Energy Crisis ◽  
Low Light ◽  
Reduction Activity

Photocatalytic reduction of carbon dioxide into chemical fuels has great practical significance in solving energy crisis and environmental pollution, but remains a big challenge owing to its low light absorption...

Sign in / Sign up

Export Citation Format

Share Document