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Oxygen vacancies enriched nickel cobalt based nanoflower cathodes: Mechanism and application of the enhanced energy storage

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Journal of Energy Chemistry 2021年第11期30卷 252-261,I0006页

作者： Jiahui Ye Xingwu Zhai Long Chen Wen Guo Tiantian Gu Yulin Shi Juan Hou Fei Han Yi Liu Changchun Fan Gang Wang Shanglong Peng Xuhong Guo Key Laboratory for Green Process of Chemical Engineering of Xinjiang Bingtuan School of Chemistry and Chemical EngineeringShihezi UniversityShihezi 832003XinjiangChina Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology College of Materials Science and EngineeringHunan UniversityChangsha 410082HunanChina Institut für Chemie AG ElektrochemieTechnische Universität ChemnitzChemnitz 09111Germany National&Local Joint Engineering Laboratory for Optical Conversion Materials and Technology School of Physical Science and TechnologyLanzhou UniversityLanzhou 730000GansuChina State Key Laboratory of Chemical Engineering East China University of Science and TechnologyShanghai 200237China

The rational design of oxygen vacancies and electronic microstructures of electrode materials for energy storage devices still remains a challenge. Herein, we synthesize nickel cobalt-based oxides nanoflower arrays assembled with nanowires grown on Ni foam via the hydrothermal process followed annealing process in air and argon atmospheres respectively. It is found that the annealing atmosphere has a vital influence on the oxygen vacancies and electronic microstructures of resulting NiCo_(2)O_(4) (NCO-Air) and CoNiO_(2) (NCO-Ar) products, which NCO-Ar has more oxygen vacancies and larger specific surface area of 163.48 m^(2)/g. The density functional theory calculation reveals that more oxygen vacancies can provide more electrons to adsorb –OH free anions resulting in superior electrochemical energy storage performance. Therefore, the assembled asymmetric supercapacitor of NCO-Ar//active carbon delivers an excellent energy density of 112.52 Wh/kg at a power density of 558.73 W/kg and the fabricated NCO-Ar//Zn battery presents the specific capacity of 180.20 mAh/g and energy density of 308.14 Wh/kg. The experimental measurement and theoretical calculation not only provide a facile strategy to construct flower-like mesoporous architectures with massive oxygen vacancies, but also demonstrate that NCO-Ar is an ideal electrode material for the next generation of energy storage devices.

关键词： NiCo_(2)O_(4) CoNiO_(2) Supercapacitor Oxygen vacancy defects Flower-like microstructure

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Suppressed light-induced phase transition of CsPbBr_(2)I: Strategies, progress and applications in the photovoltaic field

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Journal of Semiconductors 2021年第7期42卷 24-36页

作者： Hushan Zhang Zhiwen Jin School of Physical Science and Technology&Key Laboratory of Special Function Materials and Structure Design(MoE)&National&Local Joint Engineering Laboratory for Optical Conversion Materials and Technology Lanzhou UniversityLanzhou 730000China

The rapid rise in the power conversion efficiency(PCE)of CsPbBr_(2)I-based perovskite solar cells(PSCs),from 4.7%in 2016 to 11.08%in 2020,render it a promising material for use in photovoltaic ***,the phase stability and current hysteresis caused by photo-induced phase segregation in CsPbBr_(2)I represent major obstacles to further improvements in the PCE for such *** this review,we describe the basic structure and optical properties of CsPbBr_(2)I,and systematically elaborate on the mechanism of the phase *** then discuss the strategies in progress to suppress phase transition in CsPbBr_(2)I,and their potential application in the photovoltaic ***,challenges and application prospects for CsPbBr2I PSCs are summarized in the final section of this article.

关键词： perovskite CsPbBr_(2)I stability phase transition phase segregation

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Sb^(3+)and Sm^(3+)co-doped lead-free Cs_(2)NaInCl_(6)double perovskite nanocrystals for single-component cold white emitter

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Journal of Rare Earths 2024年第9期42卷 1646-1651,I0001页

作者： Biao Zhou Xiangtong Zhang Ranran Hu Ruixue Hou William W.Yu Key Laboratory for Special Functional Materials of Ministry of Education National&Local Joint Engineering Research Centre for High-Efficiency Display and Lighting TechnologySchool of Materials and EngineeringCollaborative Innovation Centre of Nano Functional Materials and ApplicationsHenan UniversityKaifeng475000China School of Chemistry and Chemical Engineering Shandong UniversityJinan250100China

Metal halide perovskites exhibit promising prospect in light-emitting diodes,solar cells,photodetectors and ***,the workhorse of metal halide perovskites relies on toxicity lead element,which severely damages human body and *** lead-free perovskites,Cs_(2)NaInCl_(6)double perovskite is one of the most promising candidates because of its great stability and easy synthesis,but suffers inadequate optical ***,we doped Sb^(3+)and Sm^(3+)into Cs_(2)NaInCl_(6)nanocrystals by a hot injection ***_(2)NaInCl_(6):Sb^(3+)exhibits blue emission at 447 ***_(2)NaInCl_(6):Sm^(3+),Sb^(3+)nanocrystals simultaneously generate the blue emission of Sb^(3+)and the multiple emissions of Sm^(3+)at 565,602,650 and 710 *** the increase of Sm^(3+)feed ratio,the emission color of Cs_(2)NaInCl_(6):Sm^(3+),Sb^(3+)gradually moves to cold white region at(0.27,0.28)in CIE chromaticity diagram and correlated color temperature of 11840 *** work shows the potential application of Cs_(2)NaInCl_(6):Sm^(3+),Sb^(3+)nanocrystals as a single-component cold white emitter.

关键词： Lead-free Double perovskites Single component White emitter Doping Rare earths

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Design and performance tuning of luminescent materials for Micro LED 19

Design and performance tuning of luminescent materials for M...

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19th China International Forum on Solid State Lighting and 8th International Forum on Wide Bandgap Semiconductors, SSLCHINA: IFWS 2022

作者： Wang, Yuhua Wang, Xicheng Wang, Deyin Li, Tianrong Seto, Takatoshi Lanzhou University School of Materials and Energy Lanzhou730000 China Lanzhou University National and Local Joint Engineering Laboratory for Optical Conversion Materials and Technology Lanzhou730000 China

ISBN: (纸本)9798350346381

Micro-LED is regarded as the next generation of display technology, and luminescence materials are one of the key materials to achieve full color, but there are still great challenges to developing efficient quantum dots and stable small-sized phosphors. In view of the key problems in quantum dots, such as poor stability, low quantum efficiency, and difficulty in balancing the small size and brightness of phosphor materials, this report will introduce the research progress in the realization of controllable material preparation and performance regulation. © 2023 IEEE.

关键词： Quantum efficiency

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HI hydrolysis-derived intermediate as booster for CsPbI3 perovskite: from crystal structure, film fabrication to device performance

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Journal of Semiconductors 2020年第5期41卷 15-25页

作者： Zhizai Li Zhiwen Jin School of Physical Science and Technology&Key Laboratory for Magnetism and Magnetic Materials(MoE)&Key Laboratory of Special Function Materials and Structure Design(MoE)&National&Local Joint Engineering Laboratory for Optical Conversion Materials and Technology Lanzhou UniversityLanzhou 730000China

Nowadays,inorganic CsPbI3 perovskite solar cells(PSCs)have become one of the most attractive research hotspots in photovoltaic field for its superior chemical stability and excellent photo-electronic *** the first independent report in 2015,the power conversion efficiency(PCE)of CsPbI3 based PSCs has sharply increased from 3.9%to 19.03%.Importantly,during the developing process of CsPbI3 PSCs,HI hydrolysis-derived intermediate plays an important role:from stabilizing the crystal structure,optimizing the fabricated film to boosting the device *** this review,the different crystal and electronic structures of CsPbI3 are *** then trace the history and disputes of HI hydrolysis-derived intermediate to make this review more ***,we highlight the functions of HI hydrolysis-derived intermediate,and systematically summarize the advanced works on CsPbI3 ***,the bottlenecks and prospects are revealed to further increase the CsPbI3 PSCs performance.

关键词： CsPbI3 HI intermediate crystal structure stability

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Enhanced performance of CdS/CdSe quantum dotsensitized solar cells by long-persistence phosphors structural layer

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Science China materials 2020年第4期63卷 516-523页

作者： Yunlong Deng Shuqi Lu Zhiyuan Xu Jiachi Zhang Fei Ma Shanglong Peng National 8c Local Joint Engineering Laboratory for Optical Conversion Materials and Technology School of Physical Science and TechnologyLanzhou UniversityLanzhou 730000China

Light absorption plays an important role in improving the power conversion efficiency(PCE)of quantum dot-sensitized solar cells(QDSSCs).In this study,a multifunctional long-persistence phosphor(LPP)layer was introduced into the CdS/CdSe QDSSCs via a simple doctor blade *** LPP layer can simultaneously improve the light harvesting and photo charge transfer in CdS/CdSe *** a result,their short-circuit current and corresponding PCE are effectively *** PCE can reach up to 5.07%,which is about 24%larger than that of the conventional CdS/CdSe QDSSCs without LPP *** solar cells can work in dark for a while due to the long-lasting fluorescence of the LPP *** research provides an effective way to improve the PCE of QDSSCs,and finds the possibility for all-weather QDSSCs.

关键词： quantum dot-sensitized solar cells all-weather solar cells long-persistence phosphors power conversion efficiency

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Co-assembly of FeTPP@Fe_(3)O_(4) nanoparticles with photo-enhanced catalytic activity for synergistic tumor therapy

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Nano Research 2022年第10期15卷 9114-9124页

作者： Tian Tian Jianshuai Bao Jinghan Wang Jiefei Wang Yan Ge Zengyin Li Shanqing Gao Zhongqi You Xiaoyan Yang Yong Zhong Feng Bai Key Laboratory for Special Functional Materials of Ministry of Education National&Local Joint Engineering Research Center for High-efficiency Display and Lighting TechnologySchool of Materials Science and EngineeringCollaborative Innovation Center of Nano Functional Materials and ApplicationsHenan UniversityKaifeng 475004China Henan-Macquarie University Joint Centre for Biomedical Innovation School of Life SciencesHenan UniversityKaifeng 475004China

Chemodynamic therapy(CDT)offers a promising alternative to conventional cancer ***,the limited acidity and H_(2)O_(2) concentration in tumor microenvironment(TME)severely impair the anticancer effects of *** this study,we report a microemulsion-assisted coassembly method to prepare iron(III)tetraphenylporphyrin(FeTPP)and magnetic(Fe_(3)O_(4))nanocomposite material(FeTPP@Fe_(3)O_(4)),using photoactive FeTPP and Fe_(3)O_(4) nanocrystals as building *** selfassembling nature of FeTPP results in disordered aggregation and fluorescence quenching,leading to a high light-to-heat conversion ***,the photo-thermal effect enhances the catalytic decomposition of hydrogen peroxide(H_(2)O_(2))in the Fenton reaction on Fe_(3)O_(4) nanocrystals to generate highly toxic hydroxyl radicals(·OH)to destroy cancer *** cascade reaction produces a synergistic therapeutic effect between CDT and photothermal therapy(PTT),which significantly amplifies the therapeutic effect and enhances the treatment outcome of cancer *** highly efficient tumor catalytic therapy in vivo results confirmed that this nanomedicine treatment is an excellent biocompatible catalytic nanomedicine therapy achieved through a photo-enhanced Fenton reaction activity approach.

关键词： porphyrin photo-enhanced nanocatalyst synergistic therapy

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Unveiling the origin of performance enhancement of photovoltaic devices by upconversion nanoparticles

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Journal of Energy Chemistry 2022年第2期31卷 524-531页

作者： Huanhuan Yao Guoqiang Peng Zhizai Li Ge Zhu Wenquan Li Zhipeng Ci Wei Lan Hao Jia Bin Dong Zhiwen Jin School of Physical Science and Technology&National&Local Joint Engineering Laboratory for Optical Conversion Materials and Technology Lanzhou UniversityLanzhou 730000GansuChina Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission Key Laboratory of Photosensitive Materials&Devices of Liaoning ProvinceCollege of Physics and Materials EngineeringDalian Minzu UniversityDalian 116600LiaoningChina School of Physics and Electronic Information Engineering Qinghai Normal UniversityXining 810008QinghaiChina

To better utilize the infrared(IR)region in sunlight for photovoltaic devices(PVs),upconversion nanoparticles(UCNPs)have been proposed to improve power conversion efficiency(PCE).However,researchers recently have found that the upconversion(UC)effect is negligible in PVs performance improvement for their ultra-low UC photoluminescence quantum yields of UCNPs solid film,while the real mechanism of UCNPs in PVs has not been clearly ***,based on the material inorganic perovskitesγ-CsPbI_(3),NaYF_(4):20%Yb^(3+),2%Er^(3+)UCNPs were integrated into different transport layer to optimize device *** with reference device,the short-circuit current density and PCE of optimized device reached 20.87 mA/cm^(2)(20.39 mA/cm^(2))and 18.34%(17.72%),respectively,without sacrificing open-circuit voltage and filling *** experimental characterizations verified that the improved performance was attributable to enhanced visible light absorption instead of *** theoretically explain the statement,the light field distribution in device was simulated and the absorption in different layers was *** results revealed that the introduction of UCNPs with different refractive index from other layers caused light field disturbance,and improved visible light captured by γ-CsPbI_(3).Importantly,through experiments and theoretical calculation,the research deeply explored the potential mechanism of UCNPs in optimizing PVs performance.

关键词： Upconversion nanoparticles Light field disturbance Simulation Photovoltaic device γ-CsPbI_(3)

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Template-Free Synthesis of Sb_2S_3 Hollow Microspheres as Anode materials for Lithium-Ion and Sodium-Ion Batteries

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Nano-Micro Letters 2018年第1期10卷 105-116页

作者： Jianjun Xie Li Liu Jing Xia Yue Zhang Min Li Yan Ouyang Su Nie Xianyou Wang National Base for International Science and Technology Cooperation National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery Hunan Province Key Laboratory of Electrochemical Energy Storage and Conversion School of Chemistry Xiangtan University Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Nankai University

Hierarchical Sb_2S_3 hollow microspheres assembled by nanowires have been successfully synthesized by a simple and practical hydrothermal reaction. The possible formation process of this architecture was investigated by X-ray diffraction, focused-ion beam-scanning electron microscopy dual-beam system, and transmission electron microscopy. When used as the anode material for lithium-ion batteries, Sb_2S_3 hollow microspheres manifest excellent rate property and enhanced lithium-storage capability and can deliver a discharge capacity of 674 m Ah g^(-1) at a current density of 200 m A g^(-1) after 50 cycles. Even at a high currentdensity of 5000 m A g^(-1), a discharge capacity of541 m Ah g^(-1) is achieved. Sb_2S_3 hollow microspheres also display a prominent sodium-storage capacity and maintain a reversible discharge capacity of 384 m Ah g^(-1) at a current density of 200 m A g^(-1) after 50 cycles. The remarkable lithium/sodium-storage property may be attributed to the synergetic effect of its nanometer size and three-dimensional hierarchical architecture, and the outstanding stability property is attributed to the sufficient interior void space,which can buffer the volume expansion.

关键词： Sb2S3 Hollow microspheres Anode material Lithium-ion batteries Sodium-storage property

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Nitrogen-Doped TiO_2–C Composite Nanofibers with High-Capacity and Long-Cycle Life as Anode materials for Sodium-Ion Batteries

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Nano-Micro Letters 2018年第4期10卷 255-267页

作者： Su Nie Li Liu Junfang Liu Jianjun Xie Yue Zhang Jing Xia Hanxiao Yan Yiting Yuan Xianyou Wang National Base for International Science and Technology Cooperation National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery Hunan Province Key Laboratory of Electrochemical Energy Storage and Conversion School of Chemistry Xiangtan University Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai University

Nitrogen-doped TiO_2–C composite nanofibers(TiO_2/N–C NFs) were manufactured by a convenient and green electrospinning technique in which urea acted as both the nitrogen source and a pore-forming agent. The TiO_2/N–C NFs exhibit a large specific surface area(213.04 m^2 g^(-1)) and a suitable nitrogen content(5.37 wt%). The large specific surface area can increase the contribution of the extrinsic pseudocapacitance, which greatly enhances the rate capability. Further, the diffusion coefficient of sodium ions(DNa_+) could be greatly improved by the incorporation of nitrogen atoms. Thus, the TiO_2/N–C NFs display excellent electrochemical properties in Na-ion batteries. A TiO_2/N–C NF anode delivers a high reversible discharge capacity of 265.8 mAh g^(-1) at 0.05 A g^(-1) and an outstanding long cycling performance even at a high current density(118.1 m Ah g^(-1)) with almost no capacity decay at 5 A g^(-1) over 2000 cycles. Therefore, this work sheds light on the application of TiO_2-based materials in sodium-ion batteries.

关键词： Nanofibers Anode materials Sodium-ion batteries Pseudocapacitance Nitrogen-doping

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