Junming Li

Huazhong University of Science and Technology

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Zhian Zhang

Central South University

Mingdeng Wei

Fuzhou University

Chunqian Zhang

Beijing Information Science & Technology University

Fujun Zhang

Beijing Jiaotong University

Haishan Cao

Tsinghua University

Junhui Lu

Beijing University of Civil Engineering and Architecture

Yifei Wang

Fujian Institute of Research on the Structure of Matter

Shijun Luo

North China University of Water Resources and Electric Power

Yafeng Li

Fuzhou University

Baokai Ren

Beijing Information Science & Technology University

Cooperative Institutions

Chinese Academy of Sciences

Central South University

Beijing Information Science & Technology University

University of Chinese Academy of Sciences

Tsinghua University

Beijing Jiaotong University

Fuzhou University

Nanjing University

Huazhong University of Science and Technology

Helmholtz-Zentrum Berlin für Materialien und Energie

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Effect of polarization on performance of inverted solar cells based on molecular ferroelectric Hexane-1,6-diammonium pentaiodobismuth without electron transport layer

Materials Letters (2021)

Xiaolan Wang Xiaoping Zou Jialin Zhu Chunqian Zhang Jin Cheng

Photoelectric effect

Open-circuit voltage

10.1016/j.matlet.2021.130951

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Citations (1)

Biological impact of lead from halide perovskites reveals the risk of introducing a safe threshold

Nature Communications (2020)

Junming Li Hai−Lei Cao Wen-Bin Jiao Qiong Wang Mingdeng Wei

Regulations currently in force enable to claim that the lead content in perovskite solar cells is low enough to be safe, or no more dangerous, than other electronics also containing lead. However, the actual environmental impact of lead from perovskite is unknown. Here we show that the lead from perovskite leaking into the ground can enter plants, and consequently the food cycle, ten times more effectively than other lead contaminants already present as the result of the human activities. We further demonstrate that replacing lead with tin represents an environmentally-safer option. Our data suggest that we need to treat the lead from perovskite with exceptional care. In particular, we point out that the safety level for lead content in perovskite-based needs to be lower than other lead-containing electronics. We encourage replacing lead completely with more inert metals to deliver safe perovskite technologies.

Lead (geology)

10.1038/s41467-019-13910-y

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Citations (500)

Experimental viscosity measurements for copper oxide nanoparticle suspensions

Junming Li Zeliang Li Bu‐Xuan Wang

The viscosity of water with copper oxide nanoparticle suspensions was measured using capillary viscometers. The mass fractions of copper oxide nanoparticles in the experiment, w, varied between 0.02 and 0. 10, and the temperature range was 30°C to 80°C. The experimental results show that the temperature was the major factor affecting the viscosity of the nanoparticle suspensions, while the effect of the mass fraction on the viscosity was not so obvious as that of the temperature for the mass fractions chosen in the experiment. The effect of the capillary tube size on the viscosity was also found to be relatively important at higher mass fractions.

Mass fraction

Copper oxide

Reduced viscosity

Atmospheric temperature range

Mass concentration (chemistry)

Suspension

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Citations (44)

Engineering of Halide Cation in All-Inorganic Perovskite with Full-Color Luminescence

Coatings (2021)

Cuili Gai Dawei He Yongsheng Wang Jigang Wang Junming Li

All-inorganic halide perovskites are emerging as a class of superstar semiconductors with excellent optoelectronic properties and show great potential for a broad range of applications in solar cells, lighting diodes, X-ray imaging, and photodetectors. Tremendous research about their device performance has been performed since 2015. In this study, we synthesized the all-inorganic perovskite by the hot-injection method and particularly investigated their crystal structural and photoluminescence properties. By halide anion engineering, the all-inorganic perovskites showed a high-symmetry cubic phase. They also showed a tunable optical bandgap, and almost the full color luminescence was achieved (434 to 624 nm). These basic optoelectronic properties could give a guide for further development of this area.

Crystal (programming language)

10.3390/coatings11030330

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Citations (2)

Investigation of the falling water flow with evaporation for the passive containment cooling system and its scaling-down criteria

Heat and Mass Transfer (2017)

Cheng Li Junming Li Le Li

Falling (accident)

Dimensionless quantity

10.1007/s00231-017-2141-1

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Citations (5)

Defect passivation of a perovskite film by ZnIn₂S₄ nanosheets for efficient and stable perovskite solar cells

Chemical Communications (2021)

Jianting Huang Jinting Li Linqi Zheng Guohui Zhong Yafeng Li

The defects of a perovskite film were first passivated by two dimensional ZnIn2S4 nanosheets, the non-radiation recombination at interfaces was suppressed and the contact of the perovskite film with water vapour in the air was avoided, resulting in a high efficiency of 20.55%.

Passivation

10.1039/d1cc06071f

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Citations (4)

Theoretical Study on City Gas Pipeline Leakage and Diffusion

Lu Lu Yuting Yan Xingxing Zhang Junming Li Xudong Zhao

Leakage (economics)

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Machine Learning-Based Diagnosis of Defects in Chiplet Interconnects

Junming Li Huaguo Liang Xin Dou Le Yu Zhengfeng Huang

10.1109/3dic63395.2024.10830028

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Identification of Hysteresis Parameters of Current Transformer J-A Model Based on Improved Whale Algorithm

2021 China Automation Congress (CAC) (2022)

Li Xueyan Zhang Yishu Yilun Li Junming Li Yao Zhiyuan

In the accurate modeling of current transformer core, the representation of ferromagnetic material characteristics is a key point. The J-A hysteresis model has the advantages of less parameters and clear physical meaning, and is widely used in research. Aiming at the problems of low precision and time consuming in the optimization algorithm of J-A model parameter identification, this paper proposes an improved whale search algorithm to realize the fast and accurate identification of J-A hysteresis model parameters. The method combines the improved search strategy and adaptive weight, which can make the algorithm have good global search ability and local search ability, and converge to the global optimal value quickly. The new search strategy is applied to the simulation of flux and current, and the simulation results are compared with the simulation results of other algorithms. The results show that the convergence speed is faster and the identification accuracy is higher when the algorithm is used to identify the model parameters. The simulated hysteresis loop based on the parameters identified by the algorithm is in good agreement with the measured curve, which verifies the practicability, effectiveness and superiority of the algorithm.

Identification

Hysteresis

10.1109/cac57257.2022.10054741

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Citations (1)

Study on the protection of the coatings in preventing oxidation and decarbonization of steel and iron materials during heat treatment

Electroplating & Finishing (2005)

Junming Li

The protection effects of silicate coating in preventing oxidation and decarbonization of steel sample of 45#and 40Cr during heat treatment were studied respectively.Experiments on the influences of heat preservation time on oxidation weightloss rate of steel samples show that the oxidation weightloss rate of steel samples without coating increase rapidly and the variation of oxidation weightloss rate of steel samples with coating is not significant.Metallographs of steel sample after 1 100 ℃×2 h of heat treatment and oil quenching show that the degree of oxidation and decarbonization of 45~# steel sample is worse than that of 40Cr steel while that of the steel sample with coating decrease remarkably.SEM cross-section morphology of falling off coating after 860 ℃×4 h and 1 100 ℃×4 h of heat treatment and quenching show that the interior of coating presents thicker and dense layer and obvious agglomeration state.Energy analysis indicates that it might be oxidation film of the substrate and reaction product of oxidation film and components of coating.The protection principle of coating was preliminarily researched.Coating is unlikely to avoid the oxidation of steel sample.Complicated oxides can be formed by the reaction of oxide film due to slight oxidation with the component of coating,resulting in good preventing effect.

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