Kejun Chen

ORCID: 0000-0002-6585-7844
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About
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Research Areas
  • Electrocatalysts for Energy Conversion
  • CO2 Reduction Techniques and Catalysts
  • Advanced battery technologies research
  • Advanced Photocatalysis Techniques
  • Spacecraft Dynamics and Control
  • Laser Material Processing Techniques
  • Guidance and Control Systems
  • Supercapacitor Materials and Fabrication
  • Machine Learning in Materials Science
  • Advanced Surface Polishing Techniques
  • Ocular and Laser Science Research
  • graph theory and CDMA systems
  • Advancements in Transdermal Drug Delivery
  • Adaptive Control of Nonlinear Systems
  • Catalysis and Oxidation Reactions
  • Aerospace Engineering and Energy Systems
  • Electrochemical Analysis and Applications
  • Finite Group Theory Research
  • Advanced Fiber Laser Technologies
  • Fuel Cells and Related Materials
  • Ocular Surface and Contact Lens
  • Wetland Management and Conservation
  • Ionic liquids properties and applications
  • Evaluation and Optimization Models
  • Structural Analysis of Composite Materials

Central South University
2020-2024

State Key Laboratory of Powder Metallurgy
2024

Changsha University of Science and Technology
2024

PowerChina (China)
2021

Soochow University
2018-2019

Emory University
2012

Guangzhou Design Institute
2012

National University of Defense Technology
2011

Abstract The rational design of effective catalysts for sluggish oxygen evolution reactions (OERs) is desired but challenging. Nickel‐iron (NiFe) (oxy)hydroxides are promising pre‐electrocatalysts alkaline OER. However, OER performances limited by the slow reconstruction process to generate active species high‐valance NiFe oxyhydroxides. In this work, a sulfate ion (SO 4 2− ) modulated strategy developed boost activity (oxy)hydroxide accelerating electrochemical pre‐catalyst and stabilizing...

10.1002/adfm.202102772 article EN Advanced Functional Materials 2021-07-02

Nickel-iron catalysts represent an appealing platform for electrocatalytic oxygen evolution reaction (OER) in alkaline media because of their high adjustability components and activity. However, long-term stabilities under current density still remain unsatisfactory due to undesirable Fe segregation. Herein, a nitrate ion (NO3- ) tailored strategy is developed mitigate segregation, thereby improve the OER stability nickel-iron catalyst. X-ray absorption spectroscopy combined with theoretical...

10.1002/adma.202300347 article EN Advanced Materials 2023-03-07

Excessive consumption of fossil fuels gives rise to the increasing emission carbon dioxide (CO 2 ) in atmosphere and furthers ecocrisis. Electrochemical CO reduction (ECR) has both functions dwindling greenhouse gas concentration converting it into valuable products. Due intrinsic chemical inertness molecules, study on efficient low‐cost catalysts attracted much attention. Recently isolated atoms, dispersed stable support, play an important role decreasing energy barriers intermediate steps...

10.1002/smsc.202000028 article EN Small Science 2020-11-18

Ophiopogonin B (OP-B) is a bioactive component of Radix Ophiopogon Japonicus, which often used in Chinese traditional medicine to treat pulmonary disease. However, whether or not OP-B has any potential antitumor activity been reported. Here, we show that the non-small cell lung cancer (NSCLC) lines NCI-H157 and NCI-H460 treated with grow more slowly accumulate vacuoles their cytoplasm compared untreated control cells. Flow cytometric analysis showed cells were arrested G0/G1 phase. Nuclear...

10.3892/or.2012.2131 article EN cc-by-nc Oncology Reports 2012-11-09

NiFe layered double hydroxide (NiFe LDH) derived oxyhydroxides are promising electrocatalysts for the alkaline oxygen evolution reaction (OER). However, LDH with a stable metal-oxygen-metal (M-O-M) structure suffers from inadequate interaction, leading to undesirable activity and stability. Herein, we develop hydroxide-organic framework HOF) via modification of an organic linker break structural constraint M-O-M thus boost OER. HOF reconfigurable metal sites facilitates reengineering under...

10.1021/acs.nanolett.4c04815 article EN Nano Letters 2024-11-20

10.1016/0378-3758(95)00097-6 article EN Journal of Statistical Planning and Inference 1996-05-01

Laser-induced damage on fused silica is studied with photo-acoustic spectrum. The characteristics are evaluated the spectral analysis of signal. experimental results show that threshold samples about 20.9 J/cm2 at 1-ON-1 condition wavelength 1064 nm and pulse duration 10 ns. morphology observed confocal microscopy gray haze, diameter depth largest crater in haze 6.7 μm 200 nm, respectively. reproducibility spectrum characteristic peak discussed. Compared to method judged by signal amplitude,...

10.1109/lpt.2019.2908004 article EN IEEE Photonics Technology Letters 2019-03-28

A novel quasi-equilibrium glide auto-adaptive guidance algorithm based on ideology of predictor-corrector is proposed for high lifting entry vehicle. The condition constant flight path angle adopted. vehicle heading adjusted to firing plane using lateral logic firstly, and then the range-to-go calculated from terminal position constraint. needed analytical relationship between range angle. attack control trajectory satisfy with By means, which meets constraints achieved. For situation...

10.1109/rast.2011.5966837 article EN 2011-06-01

The intensity distribution of an initially plane wave incident on ceria in subsurface layer is calculated numerically with Finite-different time-domain (FDTD) solutions.The results show that the light enhancement caused by lens effect due to high refractive index ceria, and surface damage characteristics fused silica very sensitive location size wavelength. located exit generates electric field enhancements are stronger than those entrance surface. increasing can lead higher factor (LIEF)...

10.1117/12.2505815 article EN Tenth International Conference on Information Optics and Photonics 2018-11-15

The electric and thermal effects of optical thin film irradiated by Gaussian-pulsed laser are simulated with finite element method (FEM) based on the software ANSYS. field intensity distribution HfO<sub>2</sub>/SiO<sub>2</sub> high reflective (HR) is investigated. transient heat-conduction model established for calculation temperature coating. Simulation results show that, multilayer films more prone to damage than single film, upper layer HfO<sub>2</sub> in spot center may easily be damaged.

10.1117/12.2505819 article EN Tenth International Conference on Information Optics and Photonics 2018-11-15

Abstract Designing efficient catalysts with high activity and selectivity is desirable challenging for CO 2 reduction reaction (CO RR). Nickel phthalocyanine (NiPc) a promising molecule catalyst RR. However, the pristine NiPc suffers from poor adsorption activation due to its electron deficiency of Ni–N 4 site, which leads inferior stability during Here, we develop substituent-induced electronic localization strategy improve activation, thus catalytic performance. Theoretic calculations...

10.21203/rs.3.rs-138056/v1 preprint EN cc-by Research Square (Research Square) 2021-01-16
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