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学者姓名：隋曼龄
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Abstract ：
The development of pure-blue perovskite light-emitting diodes (PeLEDs) faces challenges of spectral stability and low external quantum efficiency (EQE) due to phase separation in mixed halide compositions. Perovskite quantum dots (QDs) with strong confinement effects are promising alternatives to achieve high-quality pure-blue PeLEDs, yet their performance is often hindered by the poor size distribution and high trap density. A strategy combining thermodynamic control with a polishing-driven ligand exchange process to produce high-quality QDs is developed. The strongly-confined pure-blue (approximate to 470 nm) CsPbBr3 QDs exhibit narrow size distribution (12% dispersion) and are achieved in Br-rich ion environment based on growth thermodynamic control. Subsequent polishing-driven ligand exchange process removes imperfect surface sites and replaces initial long-chain organic ligands with short-chain benzene ligands. The resulting QDs exhibit high photoluminescence quantum yield (PLQY) to near-unity. The resulting PeLEDs exhibit a pure-blue electroluminescence (EL) emission at 472 nm with narrow full-width at half-maximum (FWHM) of 25 nm, achieving a maximum EQE of 10.7% and a bright maximum luminance of 7697 cd m(-2). The pure-blue PeLEDs show ultrahigh spectral stability under high voltage, a low roll-off of EQE, and an operational half-lifetime (T-50) of 127 min at an initial luminance of 103 cd m(-2) under continuous operation.
Keyword ：
polishing-driven ligand exchange polishing-driven ligand exchange pure-blue emission pure-blue emission size distribution size distribution perovskite light-emitting diodes perovskite light-emitting diodes perovskite quantum dots perovskite quantum dots
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| GB/T 7714 | Wei, Shibo , Hu, Jingcong , Bi, Chenghao et al. Strongly-Confined CsPbBr3 Perovskite Quantum Dots with Ultralow Trap Density and Narrow Size Distribution for Efficient Pure-Blue Light-Emitting Diodes [J]. | SMALL , 2024 . |
| MLA | Wei, Shibo et al. "Strongly-Confined CsPbBr3 Perovskite Quantum Dots with Ultralow Trap Density and Narrow Size Distribution for Efficient Pure-Blue Light-Emitting Diodes" . | SMALL (2024) . |
| APA | Wei, Shibo , Hu, Jingcong , Bi, Chenghao , Ren, Ke , Wang, Xingyu , de de Leeuw, Nora H. et al. Strongly-Confined CsPbBr3 Perovskite Quantum Dots with Ultralow Trap Density and Narrow Size Distribution for Efficient Pure-Blue Light-Emitting Diodes . | SMALL , 2024 . |
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Abstract ：
Cycling-induced cathode interfacial degradations are usually attributed to chemical process, while the physical effect is overlooked to a large extent. Herein, we investigate the failure mechanism of LiCoO2 cathode and reveal that misfit strain plays a dominant role in the surface layer exfoliation process. We illustrate that highly strained LiCoO2 surface can initiate massive surface cracks, leading to the LiCoO2 surface layer broken and exfoliation. Mechanical cracking coupled with chemical etching aggravates the surface layer degradation, leading to a weathering-like degradation on LiCoO2 surface. Our work reveals that interfacial degradation of electrode materials is a complex physicochemical process. [GRAPHICS] .
Keyword ：
electron microscopy electron microscopy misfit strain misfit strain Lithium-ion battery Lithium-ion battery cracking cracking LiCoO2 LiCoO2
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| GB/T 7714 | Jiang, Yuyuan , Lu, Yuyang , Zhang, Zhengfeng et al. Misfit strain-induced mechanical cracking aggravating surface degradation of LiCoO2 [J]. | MATERIALS RESEARCH LETTERS , 2023 , 11 (6) : 471-479 . |
| MLA | Jiang, Yuyuan et al. "Misfit strain-induced mechanical cracking aggravating surface degradation of LiCoO2" . | MATERIALS RESEARCH LETTERS 11 . 6 (2023) : 471-479 . |
| APA | Jiang, Yuyuan , Lu, Yuyang , Zhang, Zhengfeng , Chang, Lige , Li, Jinhui , Han, Xiao et al. Misfit strain-induced mechanical cracking aggravating surface degradation of LiCoO2 . | MATERIALS RESEARCH LETTERS , 2023 , 11 (6) , 471-479 . |
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Abstract ：
The tailoring of active sites is closely related to the substrate. Dual-atom catalysts (DACs) have been achieved on doped carbon, oxides, and 2D materials, but are rarely reported on metals, due to the challenges of sintering and alloying using metal as the host. Herein, an innovative approach to anchor isolated single atoms as dual-atomic-site alloy (DASA) through two-step pyrolysis of porous structure is proposed. Firstly, the role of Zn and Co in generating pores during the pyrolysis of zeolite imidazolate framework (ZIFs) is revealed, and a hierarchical porous structure with self-supported Co particles is achieved by the first-step pyrolysis. Diffusion-controlled reduction of precursors containing target metals is then allowed through hierarchical structures by second-step pyrolysis, so to address the challenge of sintering and alloying at pyrolysis of high temperatures. The approach is demonstrated by synthesizing Ir1Ni1@Co/N-C DASA, with outstanding bifunctional oxygen reduction/evolution reaction (ORR/OER) performance in both acidic and alkaline media, which is rarely reported. The density functional theory (DFT) calculations represent that adsorption-free energies of intermediates OH and O are regulated to nearly 0 eV by Ir1 and Ni1 on Co. This work demonstrates a new path of constructing DASA using the designed porous structure, inspiring catalysts design in a related field. Atomic dispersion of dual-atoms has rarely been reported on metals, due to challenges of sintering and alloying using metal as host. Here, an innovative approach to synthesize DASA through two-step pyrolysis of Co-Zn-ZIF is proposed. Diffusion-controlled reduction of precursors containing target metals is allowed through hierarchical structures so to avoid sintering. The approach is demonstrated on synthesizing Ir1Ni1@Co/N-C DASA, with outstanding bifunction ORR/OER performance in both acidic and alkaline media.image
Keyword ：
in situ TEM in situ TEM zeolite imidazolate framework zeolite imidazolate framework bifunctional eletrocatalysts bifunctional eletrocatalysts Zn-Air batteries Zn-Air batteries dual-atomic-site alloys dual-atomic-site alloys
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| GB/T 7714 | Wang, Guowei , Zhang, Manchen , Zhang, Guikai et al. Novel Approach of Diffusion-Controlled Sequential Reduction to Synthesize Dual-Atomic-Site Alloy for Enhanced Bifunctional Electrocatalysis in Acidic and Alkaline Media [J]. | ADVANCED FUNCTIONAL MATERIALS , 2023 , 34 (6) . |
| MLA | Wang, Guowei et al. "Novel Approach of Diffusion-Controlled Sequential Reduction to Synthesize Dual-Atomic-Site Alloy for Enhanced Bifunctional Electrocatalysis in Acidic and Alkaline Media" . | ADVANCED FUNCTIONAL MATERIALS 34 . 6 (2023) . |
| APA | Wang, Guowei , Zhang, Manchen , Zhang, Guikai , Wang, Zelin , Chen, Xu , Ke, Xiaoxing et al. Novel Approach of Diffusion-Controlled Sequential Reduction to Synthesize Dual-Atomic-Site Alloy for Enhanced Bifunctional Electrocatalysis in Acidic and Alkaline Media . | ADVANCED FUNCTIONAL MATERIALS , 2023 , 34 (6) . |
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Abstract ：
电化学及光化学液体环境透射电子显微镜技术由于能够对固-液相界面进行直接实时动态观测,近年来在能源催化机理研究领域的机理研究得到了应用。首先,对液体环境透射电子显微镜中引入电信号和光信号的平台设计方案进行了归纳总结;其次,对这项技术在电催化产氢、二氧化碳还原以及光催化产氢这几类典型的能源催化体系中的应用进行了分类介绍和成果总结;最后,针对这项技术的局限性进行了分析,提出了解决方案并在此基础上对其未来的发展方向进行了展望。电化学及光化学液体环境透射电子显微镜技术在为各类催化反应的机理研究提供有力的技术支持的同时,其分辨率问题以及电子束与材料的相互作用等方面所带来的假象应当引起研究人员的重视。
Keyword ：
光催化 光催化 电催化 电催化 原位 原位 能源材料 能源材料 液体环境 液体环境 透射电子显微镜 透射电子显微镜
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| GB/T 7714 | 王越帅 , 黄国裕 , 沈志桐 et al. 电化学及光化学液体环境透射电子显微镜技术在能源催化研究领域的应用 [J]. | 北京工业大学学报 , 2023 , (10) : 1126-1140 . |
| MLA | 王越帅 et al. "电化学及光化学液体环境透射电子显微镜技术在能源催化研究领域的应用" . | 北京工业大学学报 10 (2023) : 1126-1140 . |
| APA | 王越帅 , 黄国裕 , 沈志桐 , 卢岳 , 隋曼龄 . 电化学及光化学液体环境透射电子显微镜技术在能源催化研究领域的应用 . | 北京工业大学学报 , 2023 , (10) , 1126-1140 . |
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Abstract ：
High chemical and mechanical stability of cathode surface are the prerequisites enabling high-performance rechargeable battery. Surface facet is among the surface properties that dictate surface stability and cycling performance, while its underlying mechanism remains elusive. Herein, it is reported that surface stability is closely related to the surface facet for a variety of layered cathodes. The investigation shows that surface structure of P2 layered cathode undergoes sequential transformation upon cycling, which results in severe surface degradation. This study finds that the surface facets perpendicular to the (002) planes experience severe cracking and corrosion, while other surface facets are much more stable. The surface stability difference mainly comes from a geometric effect on strain release, which determines the mechanical stability of surface. Chemically, transition metal condensation forms a passivation layer to effectively prevent the inward propagation of surface degradation. Therefore, the surface facets oblique to the layered-planes are intrinsically more resistant to mechanical cracking and chemical corrosion, which is further verified as a common effect in several O3-type layered cathodes. This work not only deepens the understanding of the mechanism how surface facet affects surface stability, but also validates surface facet regulation can be a promising strategy for optimizing battery materials.
Keyword ：
sodium ion batteries sodium ion batteries layered cathodes layered cathodes surface stability surface stability cracking cracking TEM TEM
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| GB/T 7714 | Wang, Kuan , Zhang, Zhengfeng , Ding, Yang et al. Surface Facet Dependent Cycling Stability of Layered Cathodes [J]. | ADVANCED FUNCTIONAL MATERIALS , 2023 , 33 (37) . |
| MLA | Wang, Kuan et al. "Surface Facet Dependent Cycling Stability of Layered Cathodes" . | ADVANCED FUNCTIONAL MATERIALS 33 . 37 (2023) . |
| APA | Wang, Kuan , Zhang, Zhengfeng , Ding, Yang , Cheng, Sulan , Xiao, Biwei , Sui, Manling et al. Surface Facet Dependent Cycling Stability of Layered Cathodes . | ADVANCED FUNCTIONAL MATERIALS , 2023 , 33 (37) . |
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Abstract ：
Surface modification is an effective approach for overcoming the interfacial degradations to enable high electrochemical performance of battery materials, yet it is still challenging to realize high-quality surface modification with simple processing, low cost, and mass production. Herein, a thermal-induced surface precipitation phenomenon is reported in a Ti-dopped LiCoO2, which can realize an ultrathin (approximate to 5 nm) and uniform surface modification by a simple annealing process. It is revealed that surface Li-deficiency enables bulk Ti to precipitate and segregate on the non-(003) surface facets, forming a Ti-enriched disordered layered structure. Such a surface modification layer can not only stabilize the interfacial chemistry but also significantly improve the charge/discharge reaction kinetics, leading to much-improved cycling stability and rate capability. Dopants surface precipitation is a unique outward diffusion process, which differs from the current surface modification techniques and further diversifies these approaches for realizing high-quality surface modification of battery materials.
Keyword ：
electron microscopy electron microscopy surface modifications surface modifications lithium-ion batteries lithium-ion batteries LiCoO2 LiCoO2 dopant precipitation dopant precipitation
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| GB/T 7714 | Li, Jinhui , Zhang, Zhengfeng , Qin, Changdong et al. Thermal-Induced Dopant Precipitation Enabling High-Quality Surface Modification of LiCoO2 [J]. | SMALL , 2023 , 19 (42) . |
| MLA | Li, Jinhui et al. "Thermal-Induced Dopant Precipitation Enabling High-Quality Surface Modification of LiCoO2" . | SMALL 19 . 42 (2023) . |
| APA | Li, Jinhui , Zhang, Zhengfeng , Qin, Changdong , Jiang, Yuyuan , Han, Xiao , Xia, Yueming et al. Thermal-Induced Dopant Precipitation Enabling High-Quality Surface Modification of LiCoO2 . | SMALL , 2023 , 19 (42) . |
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Abstract ：
Clean energy innovation has triggered the development of single-atom catalysts(SACs) due to their excellent catalytic activity, high tunability and low cost. The success of SACs for many catalytic reactions has opened a new field where the fundamentals of catalytic property-structure relationship at atomic level await exploration, and thus raises challenges for structural characterization. Among the characterization techniques for SACs, aberration-corrected transmission electron microscopy(TEM) has become an essential tool for direct visualization of single atoms. In this review, we briefly summarize recent studies on SACs using advanced TEM. We first introduce TEM methods, which are particularly important for SACs characterization, and then discuss the applications of advanced TEM for SAC characterization, where not only atomic dispersion of single atoms can be studied, but also the distribution of elements and the valence state with local coordination can be resolved. We further extend our review towards in-situ TEM, which has increasing importance for the fundamental understanding of catalytic mechanism. Perspectives of TEM for SACs are finally discussed.
Keyword ：
Electron energy loss spectroscopy(EELS) Electron energy loss spectroscopy(EELS) Single-atom catalyst Single-atom catalyst Transmission electron microscopy (TEM) Transmission electron microscopy (TEM) Energy dispersive X-ray spectroscopy(EDX) Energy dispersive X-ray spectroscopy(EDX) Scanning transmission electron microscopy(STEM) Scanning transmission electron microscopy(STEM) In-situ TEM In-situ TEM
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| GB/T 7714 | Wang Guowei , Ke Xiaoxing , Sui Manling . Advanced TEM Characterization for Single-atom Catalysts: from Ex-situ Towards In-situ [J]. | CHEMICAL RESEARCH IN CHINESE UNIVERSITIES , 2022 , 38 (5) : 1172-1184 . |
| MLA | Wang Guowei et al. "Advanced TEM Characterization for Single-atom Catalysts: from Ex-situ Towards In-situ" . | CHEMICAL RESEARCH IN CHINESE UNIVERSITIES 38 . 5 (2022) : 1172-1184 . |
| APA | Wang Guowei , Ke Xiaoxing , Sui Manling . Advanced TEM Characterization for Single-atom Catalysts: from Ex-situ Towards In-situ . | CHEMICAL RESEARCH IN CHINESE UNIVERSITIES , 2022 , 38 (5) , 1172-1184 . |
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Abstract ：
The thermal instability of organic-inorganic halide perovskite solar cells (PSCs) is one of the most important factors restraining their commercialization. It has recently been reported that modifications at the interface between the electron transport layer (ETL) and the perovskite layer could effectively promote the long-term thermal stability of high-efficiency PSCs. However, few studies have disclosed the effect of the microstructure of ETLs, such as SnO2 or TiO2, on the thermal degradation pathway of the perovskite layer at nano-, or even atomic-scale, resolution. In this work, a variety of characterization techniques were used to detect the diffusion of the oxygen element from SnO2/TiO2 layers into organic-inorganic hybrid perovskite (OIHP) layers, which was accompanied by the thermal decomposition of MAPbI(3) and FA(0.9)Cs(0.1)PbI(3) films. Moreover, a preferential thermal decomposition of the perovskite layer at the SnO2-perovskite interface was confirmed to be an adverse factor inducing the performance degradation of PSCs. First-principles calculations further elucidate that dangling bonds at the SnO2 or TiO2 ETL-perovskite interface down-regulate the oxygen vacancy formation energy. Furthermore, a low segregation energy for oxygen diffusion (0.19-0.55 eV and 0.26 eV at SnO2 and TiO2-perovskite interfaces, respectively) accelerates the transfer of the oxygen element from SnO2 or TiO2 into OIHP layers and promotes the transfer of protons in the perovskite layer. Furthermore, the fabrication of planar OIHP solar cells based on an O-2-plasma treated ETL SnO2 layer effectively improved their photoelectric performance and thermal stability, further confirming the important role of interfacial oxygen in modulating the stability of PSC devices.
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| GB/T 7714 | Song, Jingsi , Liu, Hongpeng , Pu, Wenhua et al. Thermal instability originating from the interface between organic-inorganic hybrid perovskites and oxide electron transport layers [J]. | ENERGY & ENVIRONMENTAL SCIENCE , 2022 , 15 (11) : 4836-4849 . |
| MLA | Song, Jingsi et al. "Thermal instability originating from the interface between organic-inorganic hybrid perovskites and oxide electron transport layers" . | ENERGY & ENVIRONMENTAL SCIENCE 15 . 11 (2022) : 4836-4849 . |
| APA | Song, Jingsi , Liu, Hongpeng , Pu, Wenhua , Lu, Yue , Si, Zhixiang , Zhang, Zeyu et al. Thermal instability originating from the interface between organic-inorganic hybrid perovskites and oxide electron transport layers . | ENERGY & ENVIRONMENTAL SCIENCE , 2022 , 15 (11) , 4836-4849 . |
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Abstract ：
Halide perovskites are strategically important in the field of energy materials. Along with the rapid development of the materials and related devices, there is an urgent need to understand the structure-property relationship from nanoscale to atomic scale. Much effort has been made in the past few years to overcome the difficulty of imaging limited by electron dose, and to further extend the investigation towards operando conditions. This review is dedicated to recent studies of advanced transmission electron microscopy (TEM) characterizations for halide perovskites. The irradiation damage caused by the interaction of electron beams and perovskites under conventional imaging conditions are first summarized and discussed. Low-dose TEM is then discussed, including electron diffraction and emerging techniques for high-resolution TEM (HRTEM) imaging. Atomic-resolution imaging, defects identification and chemical mapping on halide perovskites are reviewed. Cryo-TEM for halide perovskites is discussed, since it can readily suppress irradiation damage and has been rapidly developed in the past few years. Finally, the applications of in-situ TEM in the degradation study of perovskites under environmental conditions such as heating, biasing, light illumination and humidity are reviewed. More applications of emerging TEM characterizations are foreseen in the coming future, unveiling the structural origin of halide perovskite's unique properties and degradation mechanism under operando conditions, so to assist the design of a more efficient and robust energy material.
Keyword ：
irradiation damage irradiation damage scanning electron microscopy scanning electron microscopy organic-inorganic hybrid perovskite solar cell materials organic-inorganic hybrid perovskite solar cell materials energy materials energy materials transmission electron microscopy transmission electron microscopy
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| GB/T 7714 | Wu, Xiaomei , Ke, Xiaoxing , Sui, Manling . Recent progress on advanced transmission electron microscopy characterization for halide perovskite semiconductors [J]. | JOURNAL OF SEMICONDUCTORS , 2022 , 43 (4) . |
| MLA | Wu, Xiaomei et al. "Recent progress on advanced transmission electron microscopy characterization for halide perovskite semiconductors" . | JOURNAL OF SEMICONDUCTORS 43 . 4 (2022) . |
| APA | Wu, Xiaomei , Ke, Xiaoxing , Sui, Manling . Recent progress on advanced transmission electron microscopy characterization for halide perovskite semiconductors . | JOURNAL OF SEMICONDUCTORS , 2022 , 43 (4) . |
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Abstract ：
With the development of photovoltaic devices, organic-inorganic hybrid perovskite solar cells (PSCs) have been promising devices that have attracted significant attention in the fields of industrial and scientific research. Currently, the photoelectric conversion efficiency (PCE) of PSCs has been improved to 25.2%, and they are considered to be the primary alternative to silicon-based solar cells. However, the environmental stability of PSCs is unsatisfactory; they are prone to degradation under exposure to moisture, oxygen, elevated temperature, or even light illumination, which restricts their wide application in industrial production. Previous studies have elucidated that understanding the ultraviolet (UV)-induced degradation mechanism of organic-inorganic PSCs is of great importance for the improvement of light stability in PSCs. However, until now, there has been almost no comprehensive investigation on the decay process of PSCs under UV light illumination nor on the corresponding evolution of their microstructure. In this study, focused ion beam scanning electron microscopy (FIB-SEM) and aberration-corrected transmission electron microscopy (TEM) were used to comprehensively study changes in the performance and the evolution of the microstructure of PSC devices. The experimental results show that a built-in electric field developed under UV light illumination, which drove the diffusion of iodide ions (I-) from the CH3NH3PbI3 (MAPbI(3)) layer to the hole transfer layer (HTL, Spiro-OMeTAD). Together with the photo-excited holes in the HTL, the I- ions reacted with the Au electrode, and the Au atoms were oxidized into Au+ ions. Furthermore, Au+ ions preferred to diffuse across the HTL and the perovskite layer into the interface between the SnO2 and MAPbI(3) layers. SnO2 is known to be a good electron transfer layer (ETL), which should collect the photo-excited electrons to reduce the Au+ ions into metallic Au clusters; this is why the Au electrode was destroyed and Au clusters aggregated at the SnO2-MAPbI(3) interface under the UV light illumination. Meanwhile, the Au clusters would accelerate the degradation of the perovskite. In addition, as the PSC performance declined (as determined by the PCE, open-circuit voltage (V-oc), and short-circuit current (J(sc))), the decomposition of tetragonal MAPbI(3) into hexagonal PbI2 was observed at the interface between Spiro-OMeTAD and MAPbI(3), along with a widening of the grain boundaries in the perovskite layer. All of these factors play critical roles in the UV-induced degradation of PSCs. This is the first study to elucidate the light-induced migration of Au from the metal electrode to the interface between SnO2/MAPbI(3), which reveals that the UV-induced degradation of PSCs may be mitigated by finding new ways to restrain the interdiffusion of Au+ and I- ions.
Keyword ：
Gold migration Gold migration Electron microscopy Electron microscopy Perovskite solar cell Perovskite solar cell Degradation mechanism Degradation mechanism Ultraviolet Ultraviolet
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| GB/T 7714 | Lu, Yue , Ge, Yang , Sui, Manling . Degradation Mechanism of CH3NH3PbI3-based Perovskite Solar Cells under Ultraviolet Illumination [J]. | ACTA PHYSICO-CHIMICA SINICA , 2022 , 38 (5) . |
| MLA | Lu, Yue et al. "Degradation Mechanism of CH3NH3PbI3-based Perovskite Solar Cells under Ultraviolet Illumination" . | ACTA PHYSICO-CHIMICA SINICA 38 . 5 (2022) . |
| APA | Lu, Yue , Ge, Yang , Sui, Manling . Degradation Mechanism of CH3NH3PbI3-based Perovskite Solar Cells under Ultraviolet Illumination . | ACTA PHYSICO-CHIMICA SINICA , 2022 , 38 (5) . |
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