Charge compensation co-doping enhances the photocatalytic activity of black phosphorus

2021 ◽  
Vol 516 ◽  
pp. 112008
Author(s):  
Yafei Zhao ◽  
Liang He
Keyword(s):  
Photocatalytic Activity ◽  
Charge Compensation ◽  
Black Phosphorus ◽  
Co Doping

Synergistic Effect of Eu3+ and Sm3+ Co-Doping on Photocatalytic Activity of TiO2 Nanoparticles

2011 ◽  
Vol 197-198 ◽  
pp. 891-894 ◽  
Author(s):  
Cheng Zhi Jiang ◽  
Xu Dong Lu
Keyword(s):  
Photocatalytic Activity ◽  
Synergistic Effect ◽  
Sol Gel ◽  
Blue Shift ◽  
Nano Particles ◽  
Absorption Profile ◽  
Co Doping ◽  
The Matrix ◽  
Co Doped ◽  
The Eu

Pure TiO2, Eu3+and Sm3+co-doping TiO2composite nanoparticles have been prepared by sol-gel method and characterized by the techniques such as XRD, SEM and DRS. The photocatalytic degradation of methylene blue (MB) in aqueous solution was used as a probe reaction to evaluate their photocatalytic activity. The matrix distortion of TiO2nano-particles increases after co-doping of Eu3+and Sm3+and a blue-shift of the absorption profile are clearly observed. The results show that co-doping of Eu3+and Sm3+inhibits the phase transformation of TiO2from anatase to rutile, decreases the diameter of TiO2nano-particles and significantly enhance the photocatalytic activity of TiO2. The Eu3+and Sm3+co-doped into TiO2nano-particles exert a synergistic effect on their photocatalytic activity.

Enhanced photocatalytic activity of the direct Z-scheme black phosphorus/BiOX (X = Cl, Br, I) heterostructures

2021 ◽  
Author(s):  
Sheng Tian ◽  
Yu-Feng Ding ◽  
Meng-Qiu Cai ◽  
Lang Chen ◽  
Chak-Tong Au ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Layered Structure ◽  
Black Phosphorus ◽  
Bismuth Oxyhalides ◽  
Photocatalytic Material ◽  
Excellent Stability

Bismuth oxyhalides (BiOX), as a typical photocatalytic material, have attracted much attention due to their unique layered structure, non-toxicity and excellent stability.

Band gap and morphology engineering of TiO2 by silica and fluorine co-doping for efficient ultraviolet and visible photocatalysis

RSC Advances ◽  
2016 ◽  
Vol 6 (68) ◽  
pp. 63117-63130 ◽  
Author(s):  
Hua Tang ◽  
Shufang Chang ◽  
Kongqiang Wu ◽  
Guogang Tang ◽  
Yanhui Fu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Band Gap ◽  
Synthetic Method ◽  
Co Doping ◽  
Morphology Engineering ◽  
Visible Photocatalysis ◽  
Co Doped

Silicon and fluorine co-doped anatase TiO2 (Si–F–TiO2) photocatalysts with enhanced photocatalytic activity were successfully prepared via a facile two-step synthetic method by using SiO2 powders and (NH4)2TiF6 as the precursors.

Understanding Persistent Luminescence: Rare-Earth- and Eu2+-doped Sr2MgSi2O7

2014 ◽  
Vol 69 (2) ◽  
pp. 171-182 ◽  
Author(s):  
Mika Lastusaari ◽  
Högne Jungner ◽  
Aleksei Kotlov ◽  
Taneli Laamanen ◽  
Lucas C. V. Rodrigues ◽  
...  
Keyword(s):  
Rare Earth ◽  
Band Gap ◽  
Charge Compensation ◽  
Band Gap Energy ◽  
Persistent Luminescence ◽  
Excitation Spectra ◽  
Co Doping ◽  
The Individual ◽  
Initial Intensity ◽  
The Eu

Similar to many other Eu2+,RE3+-co-doped persistent luminescence materials, for Sr2MgSi2O7:Eu2+,RE3+ the initial intensity and duration of persistent luminescence was also found to depend critically on the rare-earth (RE) co-doping. An enhancement of 1 - 2 orders of magnitude in these properties could be obtained by Dy3+ co-doping whereas total quenching of persistent luminescence resulted from the use of Sm3+ and Yb3+. To solve this drastic disparity, the effects of the individual RE3+ ions were studied with thermoluminescence (TL) spectroscopy to derive information about the formation of traps storing the excitation energy. The charge compensation defects were concluded to be the origin of the complex TL glow curve structure. The tuning of the band gap of the Sr2MgSi2O7 host and especially the position of the bottom of the conduction band due to the Eu2+,RE3+ co-doping was measured with the synchrotron radiation vacuum UV (VUV) excitation spectra of the Eu2+ dopant. The model based on the evolution of the band gap energy with RE3+ co-doping was found to explain the intensity and duration of the persistent luminescence.

Enhancing photocatalytic activity in monolayer MoS2 by charge compensated co-doping with P and Cl: First principles study

2019 ◽  
Vol 468 ◽  
pp. 94-99 ◽  
Author(s):  
Yafei Zhao ◽  
Yizhe Sun ◽  
Xiaoying Hu ◽  
Jian Tu ◽  
Qinwu Gao ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
First Principles ◽  
Monolayer Mos2 ◽  
Co Doping ◽  
First Principles Study

scholarly journals Ce3+:CaSc2O4 Crystal Fibers for Green Light Emission: Growth Issues and Characterization

2014 ◽  
Vol 1655 ◽  
Author(s):  
Detlef Klimm ◽  
Jan Philippen ◽  
Toni Markurt ◽  
Albert Kwasniewski
Keyword(s):  
Melting Point ◽  
Light Emission ◽  
Green Light ◽  
Optical Emission ◽  
Charge Compensation ◽  
Scanning Calorimetry ◽  
Co Doping ◽  
Emission Growth ◽  
Crystal Fibers ◽  
Alkaline Oxides

ABSTRACTCe3+ is known to show broad optical emission peaking in the green spectral range. For the stabilization of 3-valent cerium in ceramic phosphors such as calcium scandate CaSc2O4, often co-doping with sodium for charge compensation is performed (Na+, Ce3+ ↔ 2 Ca2+). At the melting point of CaSc2O4 (≈2110°C), however, alkaline oxides evaporate completely and co-doping is thus no option for crystal growth from the melt. It is shown that even without co-doping Ce3+:CaSc2O4 crystal fibers can be grown from the melt by laser-heated pedestal growth (LHPG) in a suitable reactive atmosphere. Reactive means here that the oxygen partial pressure is a function of temperature and pO2(T) rises for this atmosphere in such a way that Ce3+ is kept stable for all T. Crystal fibers with ≈1 mm diameter and ≤50 mm length were grown and characterized. Differential thermal analysis (DTA) was performed in the pseudo-binary system CaO–Sc2O3, and the specific heat capacity cp(T) of CaSc2O4 was measured up to 1240 K by differential scanning calorimetry (DSC). Near and beyond the melting point of calcium scandate significant evaporation of calcium tends to shift the melt composition towards the Sc2O3 side. Measurements and thermodynamic calculations reveal quantitative data on the fugacities of evaporating species.

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