Prolonged electron lifetime in sulfur vacancy-rich ZnCdS nanocages by interstitial phosphorus doping for photocatalytic water reduction

2020 ◽  
Vol 4 (11) ◽  
pp. 3234-3239
Author(s):  
Qiaohong Zhu ◽  
Zehong Xu ◽  
Qiuying Yi ◽  
Muhammad Nasir ◽  
Mingyang Xing ◽  
...  
Keyword(s):  
Fermi Level ◽  
Photocatalytic Performance ◽  
Electron Trapping ◽  
Electron Lifetime ◽  
Phosphorus Doping ◽  
Sulfur Vacancy ◽  
Effective Electron ◽  
Dopant Atoms ◽  
Vacancy Level ◽  
Electron Trapping Center

Sulfur vacancy-rich ZnCdS nanocages with interstitial P dopant atoms were fabricated. The promoted Fermi level caused by interstitial P doping facilitates the S vacancy level to be an effective electron trapping center, thus enhancing the photocatalytic performance.

scholarly journals STM Observation of the Si(111) - (7×7) Reconstructed Surface Modified by Excess Phosphorus Doping

2017 ◽  
Vol 7 (6) ◽  
pp. 2993 ◽  
Author(s):  
Hirulak D. Siriwardena ◽  
Toru Yamashita ◽  
Masaru Shimomura
Keyword(s):  
Electric Field ◽  
Lone Electron Pair ◽  
High Surface ◽  
Surface Strain ◽  
Semiconductor Surface ◽  
Phosphorus Doping ◽  
Dynamic Movement ◽  
Reconstructed Surface ◽  
Dopant Atoms ◽  
Surface Modified

<span>The electronic properties of semiconductor surfaces change readily upon changing the carrier densities by controlling the dopant concentration. Additionally, excess dopant atoms can exert electric field which would affect the molecular adsorption process and could be used to manipulate the dynamic movement of confined molecules. A mechanism can be developed to control the molecular dynamic movement on modified semiconductor surface by dopants thus changing the effect of the electric field on the active molecules.  In this study, the Si(111) surface was doped with phosphorus excessively using thermal diffusion process. The surface was then reconstructed to the 7 × 7 configuration via heating under UHV conditions and then studied through STM and STS techniques. The protrusions due to surface and subsurface P atoms appear brighter due to the lone electron pair. The 7 × 7 reconstruction would be destabilized after a critical P substitution of Si-adatom concentration due to high surface strain result in P-terminated (6√3 × 6√3)</span><em><span>R</span></em><span>30º reconstruction.</span>

Phosphorus Doping Induced the Co-Construction of Sulfur Vacancies and Heterojunctions in Tin Disulfide as a Durable Anode for Lithium/Sodium-Ion Batteries

2022 ◽  
Author(s):  
Zhen Kong ◽  
Meiling Huang ◽  
Zhenyan Liang ◽  
Huayao Tu ◽  
Kang Zhang ◽  
...  
Keyword(s):  
Electrode Materials ◽  
Sodium Ion ◽  
Electrochemical Performances ◽  
Sodium Ion Batteries ◽  
Phosphorus Doping ◽  
Sulfur Vacancy ◽  
Tin Disulfide ◽  
Promising Strategy

The reasonable design of electrode materials with heterojunction and vacancy is a promising strategy to elevate its electrochemical performances. Herein, tin-based sulfide composites with heterojunction and sulfur vacancy encapsulated by...

scholarly journals Preparation of Novel ZnO/Cu2O Heterojunctions Composite Film by Codeposition Method and Their Enhanced Photocatalytic Performance Analysis

2021 ◽  
Author(s):  
xiaojiao yu ◽  
Qinggong Ji ◽  
Yuchen Wei ◽  
Zongbin Liu ◽  
Ningning Zhao ◽  
...  
Keyword(s):  
Fermi Level ◽  
Composite Film ◽  
Photocatalytic Performance ◽  
Open Circuit ◽  
Significant Shift ◽  
Photogenerated Carrier ◽  
Internal Electric Field ◽  
Dye Pollutants ◽  
Photoelectric Properties ◽  
Cu2o Film

Abstract IIn this paper, a codeposition method is used to prepare ZnO/Cu2O composite film with a heterojunction structure in one step. The microstructure and photoelectric properties of the prepared ZnO/Cu2O composite film are characterized and analyzed, and its photocatalytic performance is evaluated. Compared with pure the Cu2O film, the composite film exposes more (111) crystal planes, and has a smaller impedance and a larger photocurrent and open circuit voltage value. These findings indicate that the ZnO/Cu2O composite film exhibits excellent photogenerated carrier separation and migration efficiencies. Among the prepared samples, M2 demonstrates the highest photocatalytic and recycling performance. The calculation of the band position shows that the Fermi level of the composite film exhibits a significant shift compared to that of the pure Cu2O film. The analysis shows that the decrease in the recombination probability of photogenerated carriers caused by the shift of the Fermi level and formation of an internal electric field is the main factor for the significant enhancement in the Cu2O photocatalytic performance. This article provides a novel method and idea to realize the efficient removal of organic dye pollutants in sewage.

scholarly journals Bi2WO6–BiOCl heterostructure with enhanced photocatalytic activity for efficient degradation of oxytetracycline

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Mengfan Guo ◽  
Zhaobo Zhou ◽  
Shengnan Yan ◽  
Pengfei Zhou ◽  
Feng Miao ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Density Functional ◽  
Photocatalytic Performance ◽  
Charge Carriers ◽  
Internal Electric Field ◽  
Functional Theory ◽  
Effective Electron ◽  
Solvothermal Methods ◽  
Emerging Organic Pollutants ◽  
Excellent Stability

Abstract The application of BiOCl in photocatalysis has been restricted by its low utilization of solar energy and fast recombination of charge carriers. In this study, zero-dimensional (0D) Bi2WO6 nanoparticles/two-dimensional (2D) layered BiOCl heterojunction composite was successfully constructed by facile hydrothermal and solvothermal methods. The most favorable sunlight photocatalytic activity was achieved for the as-prepared Bi2WO6–BiOCl composites with a ratio of 1%. The photocatalytic rate and mineralization efficiency of one typical antibiotic (i.e., oxytetracycline) over 1% Bi2WO6–BiOCl was about 2.7 and 5.3 times as high as that of BiOCl. Both experimental characterizations and density functional theory (DFT) calculations confirmed that the excellent photocatalytic performance mainly arised from the effective charge separation along the Bi2WO6 and BiOCl heterojunction interface. The effective electron transfer was driven by the internal electric field at the interfacial junction. In addition, 1% Bi2WO6–BiOCl exhibited excellent stability, and no apparent deactivation was observed after 4 test cycles. Therefore, the 0D/2D Bi2WO6–BiOCl heterojunction showed a great potential for the photocatalytic degradation of emerging organic pollutants.

Modification of tungsten trioxide with ionic liquid for enhanced photocatalytic performance

RSC Advances ◽  
2014 ◽  
Vol 4 (71) ◽  
pp. 37556-37562 ◽  
Author(s):  
Jingjing Liu ◽  
Suiqi Han ◽  
Jia Li ◽  
Jun Lin
Keyword(s):  
Ionic Liquid ◽  
Tungsten Trioxide ◽  
Photocatalytic Performance ◽  
Electron Trapping ◽  
Electron Hole

Ionic liquid (IL) modification endows the surface of WO3 with a stronger electron-trapping capability, which effectively inhibits the recombination of electron–hole pairs and thus enhances photocatalysis.

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