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学者姓名：刘丹敏
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Abstract ：
Magnetic phase transitions play crucial roles in various material applications, including sensors, actuators, information storage, magnetic refrigeration, and so on. Typically, these magnetic phase transitions exhibit discontinuous first-order phase transitions. When a material undergoes a magnetic phase transition, it often exhibits simultaneous changes in both its crystal and electronic structures. However, the coupling relationship between the crystal structure and electronic structure during these phase transitions has not been well studied. This lack of understanding hinders our ability to integrate macroscopic physical phenomena with microscopic crystal and electronic structures. In this paper, we prepared single crystal and polycrystalline CeMn2Ge2 alloy, which has been extensively studied in recent years as a material of skyrmions. The relationships between the magnetic phase transition and the crystal structure of CeMn2Ge2 were investigated through magnetic measurements, variable-temperature X-ray diffraction (XRD), and experimental electron density analysis via the maximum entropy method (MEM). The results indicate that the antiferromagnetic phase transition at TN = 415 K is characterized by an increase in the intralayer Mn-Mn bond and a decrease in the Ge-Ge bond. More importantly, the ferromagnetic transition at TC = 315 K can be divided into two stages: the first stage involves the anisotropic transformation of Mn, and the second stage involves the electron enhancement of Mn. The combination of phase transition features and transport properties indicates strong anisotropy in CeMn2Ge2. Notably, our work reveals a coupling between a material's physical properties, crystal structure, and electronic structure. Our study offers a new approach for determining the origin of magnetic phase transitions and the causes of their physical properties in materials at the electronic level.
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| GB/T 7714 | Wang, Siyu , Ma, Lin , He, Lidong et al. Research on the Structural and Magnetic Phase Transitions of CeMn2Ge2 Alloy [J]. | INORGANIC CHEMISTRY , 2024 , 63 (52) : 24834-24843 . |
| MLA | Wang, Siyu et al. "Research on the Structural and Magnetic Phase Transitions of CeMn2Ge2 Alloy" . | INORGANIC CHEMISTRY 63 . 52 (2024) : 24834-24843 . |
| APA | Wang, Siyu , Ma, Lin , He, Lidong , Liu, Danmin , Wang, Yibo , Fan, Changzeng et al. Research on the Structural and Magnetic Phase Transitions of CeMn2Ge2 Alloy . | INORGANIC CHEMISTRY , 2024 , 63 (52) , 24834-24843 . |
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Abstract ：
Hydrogen production from electrolytic water is an important sustainable technology to realize renewable energy conversion and carbon neutrality. However, it is limited by the high overpotential of oxygen evolution reaction (OER) at the anode. To reduce the operating voltage of electrolyzer, herein thermodynamically favorable glycerol oxidation reaction (GOR) is proposed to replace the OER. Moreover, vertical NiO flakes and NiMoNH nanopillars are developed to boost the reaction kinetics of anodic GOR and cathodic hydrogen evolution, respectively. Meanwhile, excluding the explosion risk of mixed H-2/O-2, a cheap organic membrane is used to replace the expensive anion exchange membrane in the electrolyzer. Impressively, the electrolyzer delivers a remarkable reduction of operation voltage by 280 mV, and exhibits good long-term stability. This work provides a new paradigm of hydrogen production with low cost and good feasibility.
Keyword ：
Nanostructure Nanostructure Flow cell Flow cell Hydrogen evolution reaction Hydrogen evolution reaction Oxygen evolution reaction Oxygen evolution reaction Glycerol oxidation reaction Glycerol oxidation reaction
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| GB/T 7714 | Li, Shanlin , Liu, Danmin , Wang, Guowei et al. Vertical 3D Nanostructures Boost Efficient Hydrogen Production Coupled with Glycerol Oxidation Under Alkaline Conditions [J]. | NANO-MICRO LETTERS , 2023 , 15 (1) . |
| MLA | Li, Shanlin et al. "Vertical 3D Nanostructures Boost Efficient Hydrogen Production Coupled with Glycerol Oxidation Under Alkaline Conditions" . | NANO-MICRO LETTERS 15 . 1 (2023) . |
| APA | Li, Shanlin , Liu, Danmin , Wang, Guowei , Ma, Peijie , Wang, Xunlu , Wang, Jiacheng et al. Vertical 3D Nanostructures Boost Efficient Hydrogen Production Coupled with Glycerol Oxidation Under Alkaline Conditions . | NANO-MICRO LETTERS , 2023 , 15 (1) . |
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Abstract ：
Methylammonium lead iodide (MAPbI(3)) perovskitematerialshave attracted widespread attention owing to their charming performance.However, the lack of in-depth exploration of the temporal resolutionof the phase transition process has affected their further application.Here, we explored transient optical properties in tetragonal-orthorhombicphase transition behavior at the ultrafast time scale based on ourdelicately grown MAPbI(3) high-quality bulk single crystal.The distinct relaxation characteristics in the structural phase transitionwere found through the pump laser energy-dependent transient reflectionmeasurements while keeping the lattice temperature constant, suggestingthat the relaxation process dominated by electron-phonon interactionis related to the electronic structure of the crystal phase. The transientmeasurement of the lattice temperature slowly changing reveals thedynamic evolution of the whole phase transition process and also stronglyconfirms that the phase transition temperature range is only 1 K.Such an ultrafast dynamics study of crystals at the process of constantand variable temperatures provides a unique insight into the photophysicalprocess of perovskites and opens a new door for studying the ultrafastphase transition of crystals.
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| GB/T 7714 | Li, Yachao , Song, Haiying , Ma, Xiaoran et al. Observation of Tetragonal-to-Orthorhombic Phase Transition in Perovskite MAPbI(3) Single Crystal via Ultrafast Photoexcitation [J]. | JOURNAL OF PHYSICAL CHEMISTRY C , 2023 , 127 (26) : 12613-12620 . |
| MLA | Li, Yachao et al. "Observation of Tetragonal-to-Orthorhombic Phase Transition in Perovskite MAPbI(3) Single Crystal via Ultrafast Photoexcitation" . | JOURNAL OF PHYSICAL CHEMISTRY C 127 . 26 (2023) : 12613-12620 . |
| APA | Li, Yachao , Song, Haiying , Ma, Xiaoran , Liu, Junfeng , Ge, Chao , Liu, Danmin et al. Observation of Tetragonal-to-Orthorhombic Phase Transition in Perovskite MAPbI(3) Single Crystal via Ultrafast Photoexcitation . | JOURNAL OF PHYSICAL CHEMISTRY C , 2023 , 127 (26) , 12613-12620 . |
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Abstract ：
The transport properties of ferromagnetic compound CeMn2Ge2 have been systematically studied by magnetic resistivity measurements. Strikingly, it has been found that CeMn2Ge2 compound displays a giant topological Hall effect (THE) about 0.8 mu Omega.cm with 0.45 T magnetic field under 220 k. THE appears in a wide temperature range between 70 and 310 K in a magnetic field region, and could even appear in a zero magnetic field at room temperature. The magnetoresistance curves present gradual change with kinks which have relation to magnetic transitions. Moreover, these results show that topologically protected spin texture may exist in CeMn2Ge2 ferromagnetic compound.
Keyword ：
Non-collinear materials Non-collinear materials CeMn2Ge2 CeMn2Ge2 Sintering Sintering Topological Hall effect Topological Hall effect Magnetic materials Magnetic materials
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| GB/T 7714 | Xu, Guoliang , Liu, Danmin , He, Lidong et al. A giant topological Hall effect in ferromagnetic compound CeMn2Ge2 with wide temperature range from 70 to 310 k [J]. | MATERIALS LETTERS , 2022 , 315 . |
| MLA | Xu, Guoliang et al. "A giant topological Hall effect in ferromagnetic compound CeMn2Ge2 with wide temperature range from 70 to 310 k" . | MATERIALS LETTERS 315 (2022) . |
| APA | Xu, Guoliang , Liu, Danmin , He, Lidong , Wang, Shaobo , Ma, Lin . A giant topological Hall effect in ferromagnetic compound CeMn2Ge2 with wide temperature range from 70 to 310 k . | MATERIALS LETTERS , 2022 , 315 . |
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Abstract ：
Studying ultrafast dynamics provides us with a way to modify materials from the timescale of particle interaction, and the related research on antiferromagnetic semiconductors is still inadequate. Based on the electron density reconstruction, we achieve the visualization of magnetic interactions of bulk antiferromagnetic MnPS3 in the ground state, reveal the role of two atomic site occupations of S atoms in different magnetic phase transitions, and provide the theoretical and experimental support for modifying magnetic properties by selectively replacing the S atom. The ultrafast carrier dynamics can provide information from the excited state to the ground state. Based on time-resolved transmittance measurements, ultrafast carrier dynamics of MnPS3 are reported. The phonon-assisted gap transition driven by the electronic structure is characterized. The coupling relationship among electrons, spin, and phonons is established. Furthermore, the spin orientations within different phases are confirmed.
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| GB/T 7714 | Liu, Junfeng , Liu, Danmin , Li, Yachao et al. Electron Density Changes and Ultrafast Carrier Dynamics of the Antiferromagnetic Semiconductor MnPS3 through Magnetic Phase Transition [J]. | INORGANIC CHEMISTRY , 2022 , 61 (46) : 18380-18389 . |
| MLA | Liu, Junfeng et al. "Electron Density Changes and Ultrafast Carrier Dynamics of the Antiferromagnetic Semiconductor MnPS3 through Magnetic Phase Transition" . | INORGANIC CHEMISTRY 61 . 46 (2022) : 18380-18389 . |
| APA | Liu, Junfeng , Liu, Danmin , Li, Yachao , Song, Haiying , Zheng, Xinqi , Fan, Changzeng et al. Electron Density Changes and Ultrafast Carrier Dynamics of the Antiferromagnetic Semiconductor MnPS3 through Magnetic Phase Transition . | INORGANIC CHEMISTRY , 2022 , 61 (46) , 18380-18389 . |
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Abstract ：
A paired electrochemical refinery toward the cathodic nitrate reduction reaction (NO3RR) and anodic glycerol oxidation reaction (GOR) driven by renewable electricity could generate high value-added ammonia and formic acid simultaneously. However, both cathode and anode electrocatalysts often suffer from low efficiency and unclear reconstruction. Herein, we prepare a non-noble NiCu-OH nanocomposite precatalyst composed of crystalline Cu-2(OH)(3)(NO3) and amorphous Ni(OH)(2), which can be reconstructed into high-activity and stable cathodic NO3RR and anodic GOR electrocatalysts under operating conditions. Various in situ and ex situ experiments demonstrate that NiCu-OH could convert into active Cu nanoparticles coupled with amorphous Ni(OH)(2) under cathodic NO3RR conditions. Meanwhile, under anodic GOR conditions, NiCu-OH-derived bimetal oxide (NiCuO) changes into active NiOOH species composited with Cu vacancy-rich CuO. Furthermore, an actual paired electrochemical refinery with the reconstructed NiCu-based catalysts toward the NO3RR and GOR shows a low potential of 1.37 V at a current density of 100 mA cm(-2) to continuously produce ammonium and formate. This study provides a new paradigm for the design of an electrochemical refinery with reconstructed non-noble electrocatalysts toward chemical upgradation.
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| GB/T 7714 | Li, Shanlin , Ma, Peijie , Gao, Chunlang et al. Reconstruction-induced NiCu-based catalysts towards paired electrochemical refining [J]. | ENERGY & ENVIRONMENTAL SCIENCE , 2022 , 15 (7) : 3004-3014 . |
| MLA | Li, Shanlin et al. "Reconstruction-induced NiCu-based catalysts towards paired electrochemical refining" . | ENERGY & ENVIRONMENTAL SCIENCE 15 . 7 (2022) : 3004-3014 . |
| APA | Li, Shanlin , Ma, Peijie , Gao, Chunlang , Liu, Lijia , Wang, Xunlu , Shakouri, Mohsen et al. Reconstruction-induced NiCu-based catalysts towards paired electrochemical refining . | ENERGY & ENVIRONMENTAL SCIENCE , 2022 , 15 (7) , 3004-3014 . |
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Abstract ：
二维半导体材料如石墨烯、黑磷、过渡族金属硫化物，因其尺寸小、易集成、光电性能优良等优点，是现阶段微型化光电器件的良好沟道材料.但材料存在不利于实际应用的一些缺点，如石墨烯的“零带隙”、黑磷的易降解、过渡族金属硫化物本征迁移率低.加之在器件制作过程中需要调节势垒高度，因此通过掺杂来对二维半导体材料进行调节极为必要.掺杂是通过引入杂质原子，达到调节半导体材料的载流子类型和浓度、带隙、稳定性等目的.对二维光电器件材料的主要掺杂方法、掺杂对材料微观结构和性能产生的影响进行了综述，根据掺杂原子的占位情况分为位于原材料晶格中和表面两大类进行讨论.在两大类中，介绍了多种掺杂方法，包括气相输运法、离子注入法、...
Keyword ：
二维材料 二维材料 光电性能 光电性能 纳米材料 纳米材料 光电器件 光电器件 掺杂 掺杂 半导体材料 半导体材料
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| GB/T 7714 | 刘丹敏 , 施展 , 张国庆 et al. 二维光电器件材料掺杂方法及影响 [J]. | 北京工业大学学报 , 2022 , 48 (04) : 430-442 . |
| MLA | 刘丹敏 et al. "二维光电器件材料掺杂方法及影响" . | 北京工业大学学报 48 . 04 (2022) : 430-442 . |
| APA | 刘丹敏 , 施展 , 张国庆 , 张永哲 . 二维光电器件材料掺杂方法及影响 . | 北京工业大学学报 , 2022 , 48 (04) , 430-442 . |
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稀土六硼化物(rare earth hexaboride, REB_6)作为热电子发射阴极材料已经应用于各种电子发射器件中，技术的发展对REB_6单晶阴极材料的电子发射和力学性能提出了更高的要求.掺杂稀土元素能改善发射性能，加入过渡族金属二硼化物(transition metal boride, TMB_2)形成共晶复合材料可以提高力学性能.采用区域熔炼法制备的掺杂REB_6单晶和REB_6与TMB_2定向凝固共晶复合材料都是极具应用前景的大尺寸阴极材料.首先，总结了二元REB_6的晶体结构和热发射性能，包括晶体取向和稀土元素对REB_6单晶热发射性能的影响.然后，综述了掺杂和复合REB_6的...
Keyword ：
共晶复合材料 共晶复合材料 阴极材料 阴极材料 热电子发射性能 热电子发射性能 稀土元素掺杂 稀土元素掺杂 定向凝固 定向凝固 稀土六硼化物 稀土六硼化物
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| GB/T 7714 | 刘丹敏 , 石峰 . 掺杂和复合稀土六硼化物的研究进展 [J]. | 北京工业大学学报 , 2022 , 48 (08) : 869-877 . |
| MLA | 刘丹敏 et al. "掺杂和复合稀土六硼化物的研究进展" . | 北京工业大学学报 48 . 08 (2022) : 869-877 . |
| APA | 刘丹敏 , 石峰 . 掺杂和复合稀土六硼化物的研究进展 . | 北京工业大学学报 , 2022 , 48 (08) , 869-877 . |
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Abstract ：
一种通过表面掺杂来提高二维材料KP15电学性能的方法属于光电材料与器件领域。本发明通过在材料表面掺杂有机分子，调控了KP15的导电类型以及载流子浓度，使其电学性能大大提高。本发明方法简单、效果显著，不会对材料本身造成伤害，并且具有可逆性，可推广应用于其它二维材料的掺杂中。此外，本发明增强了KP15材料的导电性，为其偏振光电探测器的应用打下了基础。
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| GB/T 7714 | 刘丹敏 , 叶帅帅 , 施展 . 一种通过表面掺杂来提高二维材料KP15电学性能的方法 : CN202210521543.2[P]. | 2022-05-13 . |
| MLA | 刘丹敏 et al. "一种通过表面掺杂来提高二维材料KP15电学性能的方法" : CN202210521543.2. | 2022-05-13 . |
| APA | 刘丹敏 , 叶帅帅 , 施展 . 一种通过表面掺杂来提高二维材料KP15电学性能的方法 : CN202210521543.2. | 2022-05-13 . |
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Abstract ：
一种基于范德华金属电极的自驱动超快光电探测器构筑方法，涉及微电子异质结光电探测器件应用领域。采用机械剥离的方法剥离二维金属材料(Fe3GeTe2、Graphene)，叠层过渡族金属硫化物WSe2，形成Fe3GeTe2‑WSe2‑Graphene异质结。在此结构中不同范德华金属电极与沟道材料WSe2的接触长度存在差异，形成非对称的几何接触形状，获得不同的肖特基势垒高度，从而形成有效的结区内部电场，产生自驱动电流。此光电探测器具有结构简单、暗电流几乎为零、响应度高、响应速率快、灵敏度高等特点。Fe3GeTe2‑WSe2‑Graphene异质结可以拓展于二维材料相关的微电子器件及光电探测器领域的应用。
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| GB/T 7714 | 刘丹敏 , 徐国梁 . 一种基于范德华金属电极的自驱动超快光电探测器构筑方法 : CN202210023809.0[P]. | 2022-01-10 . |
| MLA | 刘丹敏 et al. "一种基于范德华金属电极的自驱动超快光电探测器构筑方法" : CN202210023809.0. | 2022-01-10 . |
| APA | 刘丹敏 , 徐国梁 . 一种基于范德华金属电极的自驱动超快光电探测器构筑方法 : CN202210023809.0. | 2022-01-10 . |
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