Charge separation in a nanostep structured perovskite-type photocatalyst induced by successive surface heterojunctions

2017 ◽  
Vol 5 (21) ◽  
pp. 10442-10449 ◽  
Author(s):  
Xiaoyan Cai ◽  
Liang Mao ◽  
Junying Zhang ◽  
Mingshan Zhu ◽  
Mamoru Fujitsuka ◽  
...  
Keyword(s):  
Space Charge ◽  
Charge Separation ◽  
Large Space ◽  
Perovskite Type ◽  
Generation Activity

Successive surface heterojunctions constituted by two periodically arranged facets with large space charge separation improve photocatalytic H2 generation activity of La2Ti2O7.

scholarly journals MXene-Ti3C2 assisted one-step synthesis of carbon-supported TiO2/Bi4NbO8Cl heterostructures for enhanced photocatalytic water decontamination

Nanophotonics ◽  
2020 ◽  
Vol 9 (7) ◽  
pp. 2077-2088 ◽  
Author(s):  
Daixun Jiang ◽  
Xun Sun ◽  
Xilu Wu ◽  
Shuai Zhang ◽  
Xiaofei Qu ◽  
...  
Keyword(s):  
Charge Separation ◽  
Photocatalytic Performance ◽  
Separation Efficiency ◽  
Salt Flux ◽  
The Novel ◽  
Water Contaminants ◽  
Photocatalytic Removal ◽  
One Step ◽  
Charge Separation Efficiency ◽  
Perovskite Type

AbstractThe strategy to improve the photocatalytic removal efficiencies towards organic pollutants is still a challenge for the novel Sillen–Aurivillius perovskite type Bi4NbO8Cl. Herein, we report carbon-supported TiO2/Bi4NbO8Cl (C-TiO2/Bi4NbO8Cl) heterostructures with enhanced charge separation efficiency, which were fabricated via molten-salt flux process. The carbon-supported TiO2 particles were derived from MXene Ti3C2 precursors, and attached on plate-like Bi4NbO8Cl, acting as electron-traps to achieve supressed recombination of photo-induced charges. The improved charge separation confers C-TiO2/Bi4NbO8Cl heterostructures superior photocatalytic performance with 53% higher than pristine Bi4NbO8Cl, towards rhodamine B removal with the help of photo-induced holes. Moreover, the C-TiO2/Bi4NbO8Cl heterostructures can be expanded to deal with other water contaminants, such as methyl orange, ciprofloxacin and 2,4-dichlorophenol with 44, 25 and 13% promotion, respectively, and thus the study offers a series of efficient photocatalysts for water purification.

Charge injection and charge separation as revealed by dynamic space charge measurement in poly(propylene-ethylene) copolymer films

2008 ◽  
Vol 104 (9) ◽  
pp. 094104 ◽  
Author(s):  
Feihu Zheng ◽  
Gilbert Teyssedre ◽  
Christian Laurent ◽  
Cécilien Thomas ◽  
Mario Hoyos ◽  
...  
Keyword(s):  
Space Charge ◽  
Charge Separation ◽  
Charge Injection ◽  
Copolymer Films ◽  
Charge Measurement ◽  
Ethylene Copolymer ◽  
Poly Propylene

scholarly journals Reconstructing the electrical structure of dust storms from locally observed electric field data

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Huan Zhang ◽  
You-He Zhou
Keyword(s):  
Electric Field ◽  
Charge Density ◽  
Space Charge ◽  
Charge Separation ◽  
Field Data ◽  
Space Charge Density ◽  
Dust Storms ◽  
Dust Particles ◽  
Electrical Structure ◽  
Separation Mechanisms

Abstract While the electrification of dust storms is known to substantially affect the lifting and transport of dust particles, the electrical structure of dust storms and its underlying charge separation mechanisms are largely unclear. Here we present an inversion method, which is based on the Tikhonov regularization for inverting the electric field data collected in a near-ground observation array, to reconstruct the space-charge density and electric field in dust storms. After verifying the stability, robustness, and accuracy of the inversion procedure, we find that the reconstructed space-charge density exhibits a universal three-dimensional mosaic pattern of oppositely charged regions, probably due to the charge separation by turbulence. Furthermore, there are significant linear relationships between the reconstructed space-charge densities and measured PM10 dust concentrations at each measurement point, suggesting a multi-point large-scale charge equilibrium phenomenon in dust storms. These findings refine our understanding of charge separation mechanisms and particle transport in dust storms.

Enhancing Charge Separation and Photocatalytic Activity of Cubic SrTiO3with Perovskite-Type Materials MTaO3(M=Na, K) for Environmental Remediation: A First-Principles Study

2017 ◽  
Vol 2 (22) ◽  
pp. 6304-6316 ◽  
Author(s):  
Francis Opoku ◽  
Krishna Kuben Govender ◽  
Cornelia Gertina Catharina Elizabet van Sittert ◽  
Penny Poomani Govender
Keyword(s):  
Photocatalytic Activity ◽  
First Principles ◽  
Charge Separation ◽  
Environmental Remediation ◽  
First Principles Study ◽  
Perovskite Type

scholarly journals Assimilation of Pseudo-GLM Data Using the Ensemble Kalman Filter

2016 ◽  
Vol 144 (9) ◽  
pp. 3465-3486 ◽  
Author(s):  
Blake J. Allen ◽  
Edward R. Mansell ◽  
David C. Dowell ◽  
Wiebke Deierling
Keyword(s):  
Kalman Filter ◽  
Space Charge ◽  
Ensemble Kalman Filter ◽  
Charge Separation ◽  
Real Data ◽  
Charging Rate ◽  
Convective Scale ◽  
Mapping Array ◽  
Total Lightning ◽  
Resolution Data

Total lightning observations that will be available from the GOES-R Geostationary Lightning Mapper (GLM) have the potential to be useful in the initialization of convection-resolving numerical weather models, particularly in areas where other types of convective-scale observations are sparse or nonexistent. This study used the ensemble Kalman filter (EnKF) to assimilate real-data pseudo-GLM flash extent density (FED) observations at convection-resolving scale for a nonsevere multicell storm case (6 June 2000) and a tornadic supercell case (8 May 2003). For each case, pseudo-GLM FED observations were generated from ground-based lightning mapping array data with a spacing approximately equal to the nadir pixel width of the GLM, and tests were done to examine different FED observation operators and the utility of temporally averaging observations to smooth rapid variations in flash rates. The best results were obtained when assimilating 1-min temporal resolution data using any of three observation operators that utilized graupel mass or graupel volume. Each of these three observation operators performed well for both the weak, disorganized convection of the multicell case and the much more intense convection of the supercell case. An observation operator using the noninductive charging rate performed poorly compared to the graupel mass and graupel volume operators, a result that appears likely to be due to the inability of the noninductive charging rate to account for advection of space charge after charge separation occurs.

Observation of Charge Separation and Space-Charge Region in Single-Crystal P3HT/C60 Heterojunction Nanowires

2016 ◽  
Vol 128 (35) ◽  
pp. 10429-10433
Author(s):  
Kyung Sun Park ◽  
Ki Seok Lee ◽  
Jangmi Baek ◽  
Lynn Lee ◽  
Byung Hee Son ◽  
...  
Keyword(s):  
Single Crystal ◽  
Space Charge ◽  
Space Charge Region ◽  
Charge Separation
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