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Water triggered interfacial synthesis of highly luminescent CsPbX3:mn2+ quantum dots from nonluminescent quantum dots

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Nano Research 2020年第12期13卷 3387-3395页

作者： Jiejun Ren Xiaopeng Zhou Yuhua Wang Department of Materials Science School of Physical Science and TechnologyKey Laboratory of Special Function Materials and Structure Design of Ministry of EducationNational and Local Joint Engineering Laboratory for Optical Conversion Materials and Technology of National Development and Reform CommissionLanzhou UniversityLanzhou730000China

Currently,lead halide perovskite quantum dots(PeQDs)have attracted great attention due to their spectacular photophysical ***,the toxicity of Pb2+heavy metal ions in CsPbX3 PeQDs limits their practical ***,a facile post-treatment doping method is proposed,which enables the preparation of highly luminescent low-toxic CsPbX3:mn^2+PeQDs from nonluminescent Cs4PbX6 PeQDs at water *** monodispersed CsPbX3:mn^2+PeQDs exhibit excellent photophysical properties,including high photoluminescence quantum yield up to 87%.The reaction process and doping mechanism are deeply explored through in-situ *** simply adjusting the halide composition of the original Cs4PbX6 PeQDs or mn doping concentration,a series of CsPbX3:mn^2+PeQDs with adjustable emission could be ***,the CsPbX3:mn^2+Q-LED was fabricated and exhibited excellent orange light with the color coordinates of(0.564,0.399),correlated color temperature(CCT)of 1,918 K,and luminous efficiency(LE)of 24 lm/W,which illustrate the great promise in light emitting diode(LED)*** work not only provides a facile method for the preparation of highly luminescent low-toxic CsPbX3:mn^2+PeQDs,but also provides insights into the mechanism of doping process.

关键词： perovskite quantum dots CsPbX3:mn2+ Cs4PbX6 phase transformation mn doping

Improved photovoltaic effects in mn-doped BiFeO3 ferroelectric thin films through band gap engineering

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Chinese Physics B 2017年第6期26卷 401-405页

作者：阎堂柳陈斌刘钢牛瑞鹏尚杰高双薛武红金晶杨九如李润伟 School of Materials Science and Engineering Shanghai University Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and EngineeringChinese Academy of Sciences Zhejiang Provincial Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology and EngineeringChinese Academy of Sciences Electrical Engineering College Heilongjiang University

As a low-bandgap ferroelectric material, BiFeO3 has gained wide attention for the potential photovoltaic applications,since its photovoltaic effect in visible light range was reported in 2009. In the present work, Bi（Fe, mn）O3thin films are fabricated by pulsed laser deposition method, and the effects of mn doping on the microstructure, optical, leakage,ferroelectric and photovoltaic characteristics of Bi（Fe, mn）O3 thin films are systematically investigated. The x-ray diffraction data indicate that Bi（Fe, mn）O3 thin films each have a rhombohedrally distorted perovskite structure. From the light absorption results, it follows that the band gap of Bi（Fe, mn）O3 thin films can be tuned by doping different amounts of mn content. More importantly, photovoltaic measurement demonstrates that the short-circuit photocurrent density and the open-circuit voltage can both be remarkably improved through doping an appropriate amount of mn content, leading to the fascinating fact that the maximum power output of ITO/BiFe（0.7）mn（0.3）O3/Nb-STO capacitor is about 175 times higher than that of ITO/BiFeO3/Nb-STO capacitor. The improvement of photovoltaic response in Bi（Fe, mn）O3 thin film can be reasonably explained as being due to absorbing more visible light through bandgap engineering and maintaining the ferroelectric property at the same time.

关键词： band gap engineering BiFeO3 mn doping ferroelectric photovoltaic effect

Tuning the electrochemical behaviors of N-doped Limn_(x)Fe_(1–x)PO_(4)/C via cation engineering with metal-organic framework-templated strategy

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Journal of Energy Chemistry 2023年第10期85卷 239-253,I0008页

作者： Yilin Li Zhaohui Xu Xinyu Zhang Zhenyu Wu Jian-En Zhou Jinjiang Zhang Xiaoming Lin Guangzhou Key Laboratory of Materials for Energy Conversion and Storage Key Laboratory of Theoretical Chemistry of EnvironmentMinistry of EducationSchool of ChemistrySouth China Normal UniversityGuangzhou 510006GuangdongChina National Engineering Research Center for Carbohydrate Synthesis Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of EducationJiangxi Normal UniversityNanchang 330022JiangxiChina Jiangmen Kanhoo Industry Co. LTDJiangmen 529040GuangdongChina

LiFePO_(4),as a prevailing cathode material for lithium-ion batteries(LIBs),still encounters issues such as intrinsic poor electronic conductivity,inferior Li-ion diffusion kinetic,and two-phase transformation mechanism involving substantial structural rearrangements,resulting in unsatisfactory rate *** coating,cation doping,and morphological control have been widely employed to reconcile these *** by these,we propose a synthetic route with metal–organic frameworks(MOFs)as self-sacrificial templates to simultaneously realize shape modulation,mn doping,and N-doped carbon coating for enhanced electrochemical *** as-synthesized Li mnxFe1–xPO4/C(x=0,0.25,and0.5)deliver tunable electrochemical behaviors induced by the MOF templates,among which Limn_(0.25)Fe_(0.75)PO_(4)/C outperforms its counterparts in cyclability(164.7 mA h g^(-1)after 200 cycles at 0.5 C)and rate capability(116.3 mA h g^(-1)at 10 C).Meanwhile,the ex-situ XRD reveals a dominant single-phase solid solution mechanism of Limn_(0.25)Fe_(0.75)PO_(4)/C during delithiation,contrary to the pristine LiFePO_(4),without major structural reconstruction,which helps to explain the superior rate ***,the density functional theory(DFT)calculations verify the effects of mn doping and embody the superiority of Limn_(0.25)Fe_(0.75)PO_(4)/C as a LIB cathode,which well supports the experimental *** work provides insightful guidance for the design of tunable MOF-derived mixed transitionmetal systems for advanced LIBs.

关键词： Limn_(x)Fe_(1–x)PO_(4)/C mn doping Metal-organic framework Cathode

Effect of Manganese doping on Oxygen Storage Capacity of Ceria-Zirconia Mixed Oxides

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Journal of Rare Earths 2006年第5期24卷 549-553页

作者：吴晓东梁清翁端 Laboratory of Advanced Materials Department of Materials Science and Engineering Tsinghua University

CeO2-ZrO2-mnOx mixed oxide series were prepared by sol-gel method. CO pulse and CO-O2 cycle measurements were carried out to examine the oxygen storage complete capacity （OSCC） and dynamic oxygen storage capacity （OSC） of the samples. The doping method brought about strong interactions between manganese oxide and ceria, both in the bulk and on the surface. Only a small part of mn cations are incorporated into the ceria lattice to form solid solutions and the remaining are left on the surface as finely dispersed mn3O4. The OSC behaviors of the materials are influenced by the doping amount of mn and the solubility of mn in the CeO2 lattice. The OSC is more easily affected by available contents of oxygen storage components when the measurement frequency is low. Comparatively, the concentration of lattice defects, which affects the mobility of bulk oxygen, is the determining factor under high frequency.

关键词： CeO2-ZrO2 mixed oxides mn doping OSCC dynamic OSC rare earths

Enhanced thermoelectric properties of mn_(x)Cu_(1.8)S via tuning band structure and scattering multiscale phonons

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Journal of Materiomics 2021年第3期7卷 556-562页

作者： Zhao Zhao Dou-Dou Liang Jun Pei Jian-Lei Shi Yin Wu Rui Zhang Bo-Ping Zhang The Beijing Municipal Key Laboratory of New Energy Materials and Technologies School of Materials Science and EngineeringUniversity of Science and TechnologyBeijing100083China

Digenite(Cu_(1.8)S)as a potential p-type thermoelectric(TE)material has attracted extensive attention due to its environmental benign,abundant resources and low cost of component *** this study,the TE properties of mnxCu_(1.8)S bulk samples prepared by mechanical alloying(MA)combined with spark plasma sintering(SPS)were *** mn would initially substitute Cu and tune the band structure of Cu1.8S with an enlarged band gap ***,if mn content is beyond the solubility limit of x=0.01 in Cu1.8S will cause the formation of mnS,which contributes to the formation of Cu-rich phases at 0.02 ≤x≤ *** from the synergetic scattering effect of point defects(mn Cu,V_(S))and mnS,Cu1.96S,Cu1.97S,Cu2S phases,the lowest thermal conductivity k value of 0.75 W m^(-1) K^(-1) was obtained at 773 K for *** with the decreased k,the highest figure of merit ZT value of 0.92 at 773 K achieved in mn0.08Cu1.8S bulk sample.A maximum engineering ZTeng of 0.3 and its efficiency hmax of about 6%were obtained at 323e773 K,which is almost 3 times than that of the pristine Cu1.8S(ηmax=2.2%).Introducing mn in Cu1.8S is an effective and convenient strategy to improve TE performance.

关键词： Cu1.8S mn doping Thermoelectric Superionic conductor

Lead-free p-type mn:Cs3Cu2I5 Perovskite with Tunable Dual-colour Emission through Room-temperature Grinding Method

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Lead-free p-type Mn:Cs3Cu2I5 Perovskite with Tunable Dual-co...

2021全国太阳能电池材料器件与技术大会

作者： Junfeng Qu Shuhong Xu Fan Liu Zhuyuan Wang Haibao Shao Yiping Cui Chunlei Wang Advanced Photonics Center School of Electronic Science and Engineering Southeast University School of Electronics \& Information Nantong University

Compared with widely-studied lead halide perovskite, copper halide perovskite is toxic-free and combines better stability with comparable photoluminescence quantum yield. Cation doping has proven to be an effective way to manipulate optical and electronic properties of perovskite. Unlike lead halide perovskite able to act as the host of different kinds of dopant, copper halide perovskite acting as host material is still a great challenge. Herein, mn was successfully doped into Cs3Cu2I5 under room temperature via solid state reaction. In addition to original self-trapped emission of Cs3Cu2I5 at 445 nm, mn dopant introduced characteristic emission at ～550 nm and realized dual color emission tuned by feeding ratio, extending chroma of Cs3Cu2I5 in blue region. Meanwhile, ultraviolet photo-electron spectra results confirmed that mn2+ ion replacing Cu+ resulted in p-type doping in Cs3Cu2I5. The as-prepared mn: Cs3Cu2I5 micro-crystals show excellent stability with almost unchanged PL intensity within 15 days.

关键词： lead-free perovskite mn doping dual-colour emission p-type doping

Enhanced Visible-Light Photocatalysis of Water Splitting Coupling with MB Degradation by mn Doped g-C3N4 Nanoribbon

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Enhanced Visible-Light Photocatalysis of Water Splitting Cou...

河南省化学会2018年学术年会

作者： Xue-Qin Sun Qing-Chao Chang Wei-Hang Han Ji-Chao Wang Kai Jiang Yu-Ping Zhang College of Chemistry and Chemical Engineering Henan Institute of Science and Technology Post-doctoral Station of Environmental Science and Engineering Henan Normal University

With industrialization and rapid development of the society,human beings have to face the ever-increasing *** photocatalytic conversion,as an eco-friendly and economic technology,has received widely attention to solve the problem of fossil resource depletion and environmental pollution.A novel strategy is developed to photocatalytic water-splitting coupling with pollutant degradation using *** high-efficient and multi-functional photocatalyst is the key for the complex *** doped g-CNnanoribbons(mn-CNNR)was synthesized by the two-step calcination method,and its morphology exhibited the nanoribbon sturcture.H and O yields(380.39 and 74.78μmol/g)of photocatalytic water-splitting using mn-CNNR was 2.71 and 1.69 times higher than that using bulk g-CN(CNB)after visible-light illumination in pure ***,in the photocatalysis of water splitting coupling with MB degradation,the yields of H and O could reach 593.35 and59.47μmol/g with a 96.05%degradation efficiency of methylene blue(MB)after 3.0 h illumination and the mn-CNNR catalyst still showed the good stability and the photocatalytic activity in 5 cycling *** on the theoretical simulation and measurements,the separation of photo-generated carriers was assuredly promoted by nanoribbon-construction and mn *** on the experimental and simulated results,the formation of·OH from HO on the surface of mn-CNNR was more favorable than that on the surface of CNB in thermodynamics,leading to the excellent performance of mn-CNNR *** mn doping,the process from HO to hydroxide radicals on the g-CN surface became beneficial in thermodynamics and ***,a photocatalytic mechanism was proposed to explain the detailed process of photocatalysis for water splitting coupling with MB *** present work shed light on the design of multi-functionalization photocatalysts to simultaneously tackle the problems of energy cri

关键词： Water Splitting MB Degradation mn doping g-C3N4 Nanoribbon

Porous mn doped g-C3N4 photocatalysts for enhanced synergetic degradation under visible-light illumination

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Porous Mn doped g-C3N4 photocatalysts for enhanced synergeti...

河南省化学会2018年学术年会

作者： Weina Shi Chenyu Song Xuezhe Li Yaxin Li Gairong Chen Xinxiang University

Photocatalytic degradation by semiconductors is an ideal way to solve the environmental *** diversified photocatalysts,graphitic carbon nitrides(g-CN),as an ideal visible-light-driven semiconductor,exhibits excellent photocatalytic performance and ***,the fast electron-hole recombination limits its photocatalytic *** combined effect of the ion doping and nano-structuralization of g-CN semiconductor would be of significance to promote the photocatalytic ***,the porous mn doped g-CNphotocatalyst was synthesized by the calcination-refluxing *** as-prepared g-CN exhibits the high activity of photocatalytic degradation under visible light irradiation(>400 nm)in the mixed system of Cr(VI)and organic ***,the photocatalytic activity of Cr(VI)reduction was increased from 9.5%to 76.5%,while that of Rhodamine B(RhB)degradation was enhanced from 15.3%to 88.9%after 60 min *** porous mn doped g-CN still keeps the high degradation efficiency of mixed pollutants in the 7th *** on the computational modeling,the mn doping and carboxyl modification affect the atomic arrangement and molecular orbital distribution of the g-CN semiconductor,leading to the enhancement of photo-induced carrier ***,the active oxygen species and intermediates in the photoreaction process were discovered by ESR measurement and UV-Vis *** Rh B degradation in synergistic photocatalysis not only inhibits the reverse reaction of Cr(VI)reduction,but also validly supply the photogenerated electrons by the photosensitization *** work may be useful for rationally designing photocatalysts and providing illuminating insights into the photocatalytic mechanism.

关键词： Synergistic effect g-C3N4 mn doping Surface modification Cr(Ⅵ) reduction

Performance Study of mn-doped-CdS/CdSe Quantum Dot Co-sensitizedSolar Cells

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Performance Study of Mn-doped-CdS/CdSe Quantum Dot Co-sensit...

2014中国功能材料科技与产业高层论坛

作者： Xiaolei Qi Xiaoping Zou Sheng He Research Center for Sensor Technology Beijing Key Laboratory for SensorMinistry of Education Key Laboratory for Modern Measurement and Control TechnologySchool of Applied SciencesBeijing Information Science and Technology UniversityJianxiangqiao Campus

Quantum dot sensitized solar cells（QDSCs）have attracted great interest in recent years due to their higher theoretical photoelectric conversion ***,the conversion efficiency based on QDSCs hasnotachieve an ideal *** increase the conversion efficiency of these cells,much work has been devoted to the experiments which were on quantum dots（QDs）,electrolyte and counter *** finally it proved that doping of quantum dots is instrumental to achieve high-performance solar *** we report a kind of mn doping of CdS in the CdS/CdSe quantum dot co-sensitized solar cells on conditions of different doping concentrations and successive ion layer absorption and reaction technique（SILAR）cycles of *** a series of characterization tests,we get that the conduction band of mn doped CdS quantum dots shifts *** is helpful for charges to transport inside the *** contrast to pure CdS/CdSe QDSCs,the doped one has achieved higher current density and photoelectric conversion efficiency.

关键词： mn doping CdS/CdSe solar cell