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Laser-implantation strategy regulating dynamic evolution for ultra-stable CO2hydrogenation 认领 引用
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作者 Rongxia Zhao Shilin Fan +10 位作者 Zerui Li Siyang Li Ran Zhang Haocheng Li Hongfeng Yin Lei Lei Degao Wang Furong Liu Lin Li Yuxiang Liu Zhu Liu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第7期375-389,I0010,共15页
Single-atom catalysts for CO2hydrogenation often deactivate due to structural instability under harsh reductive conditions.An amorphous-crystalline hybrid structured In2O3/Co3O4-based catalyst with Pt s... Single-atom catalysts for CO2hydrogenation often deactivate due to structural instability under harsh reductive conditions.An amorphous-crystalline hybrid structured In2O3/Co3O4-based catalyst with Pt single-atom implantation is innovatively synthesised by laser irradiation.In this work,a dynamic sacrificial-evolution-protection regulation strategy is proposed.The implanted Pt single-atoms,serving as active seeds,undergo migration and trigger reaction-induced dynamic evolution to generate sintering-resistant CoPt3and Co3InC0.75to prevent excessive reduction of In2O3to free metallic In.Concurrently,a self-constructed atomically ordered crystalline core-amorphous oxygen-enriched protective layer(AOL)contributes to anti-sintering,dynamic oxygen compensation,and stabilization of"HCOO intermediates.As a result,the catalyst achieves 16.21%±0.98% CO2conversion and 90.57%±1.02%CH3OH selectivity over 1000 h.This study elucidates the synergistic mechanism of laser-implanted single-atom catalysts,highlighting the dynamic evolution-driven retention of activity and stability,and establishes a direct correlation between the dynamic evolution of multicomponent structures and performance.This efficient and convenient laser solid-phase synthesis technique enables coupled design of single-atom implantation and dynamic regulation of multicomponent structures,offering a critical strategy for green methanol synthesis and the design of ultra-stable catalysts under extreme conditions. 展开更多
关键词 Laser synthesis Single-atom catalyst Oxygen vacancy CO2hydrogenation to methanol Stability Amorphous-crystalline Sintering
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Microstructure Design of High-Entropy Alloys Through a Multistage Mechanical Alloying Strategy for Temperature-Stable Megahertz Electromagnetic Absorption 认领 引用 被引量：16
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作者 Xiaoji Liu Yuping Duan +4 位作者 Yuan Guo Huifang Pang Zerui Li Xingyang Sun Tongmin Wang 《Nano-Micro Letters》 SCIE EI CAS CSCD 2022年第9期49-62,共14页
Developing megahertz(MHz)electromagnetic wave(EMW)absorption materials with broadband absorption,multi-temperature adaptability,and facile preparation method remains a challenge.Herein,nanocrystalline FeCoNiCr0.4Cu... Developing megahertz(MHz)electromagnetic wave(EMW)absorption materials with broadband absorption,multi-temperature adaptability,and facile preparation method remains a challenge.Herein,nanocrystalline FeCoNiCr0.4Cu0.2 high-entropy alloy powders(HEAs)with both large aspect ratios and thin intergranular amorphous layers are constructed by a multistage mechanical alloying strategy,aiming to achieve excellent and temperature-stable permeability and EMW absorption.A single-phase face-centered cubic structure with good ductility and high crystallinity is obtained as wet milling precursors,via precisely controlling dry milling time.Then,HEAs are flattened to improve aspect ratios by synergistically regulating wet milling time.FeCoNiCr0.4Cu0.2 HEAs with dry milling 20 h and wet milling 5 h(D20)exhibit higher and more stable permeability because of larger aspect ratios and thinner intergranular amorphous layers.The maximum reflection loss(RL)of D20/SiO2 composites is greater than-7 dB with 5 mm thickness,and EMW absorption bandwidth(RL<-7 dB)can maintain between 523 and 600 MHz from-50 to 150℃.Furthermore,relying on the“cocktail effect”of HEAs,D20 sample also exhibits excellent corrosion resistance and high Curie temperature.This work provides a facile and tunable strategy to design MHz electromagnetic absorbers with temperature stability,broadband,and resistance to harsh environments. 展开更多
关键词 Electromagnetic wave absorption Multistage mechanical alloying High-entropy alloys Temperature-stable Corrosion resistance
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Analysis of the failure mechanism of ZnO varistors influenced by high-resistance media based on multi-field coupling simulation 认领 引用
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作者 Pengfei Meng Yue Yin +5 位作者 Lei Wang Jingke Guo Zerui Li Kai Zhou Guangya Zhu Yefei Xu 《High Voltage》 SCIE EI CSCD 2025年第3期673-679,共7页
This study focuses on the distribution of high-resistance media(pores and spinels)within ZnO varistors and explores the mechanical and electrical failure mechanisms of varistors under different pulse actions.Micro-CT ... This study focuses on the distribution of high-resistance media(pores and spinels)within ZnO varistors and explores the mechanical and electrical failure mechanisms of varistors under different pulse actions.Micro-CT technology revealed that the proportion of high-resistance media in the edge area is much higher than in the internal area.Simulation results indicated that a high porosity significantly increased temperature rise and thermal stress concentration,while a high spinel proportion exacerbated current concentration but had a relatively minor impact on the distribution of temperature rise and thermal stress.Under an electric field of 1000-1250 V/mm,pores transition from an insulating state to a conductive state,especially in the edge area,leading to concentrated temperature rise and thermal stress.Once the thermal stress exceeded the critical value of the mechanical strength of the pores,cracking failure occurred.The high spinel proportion in the edge area further intensified current concentration under high electric fields,working together with the conductivity of the pores to produce a significant local temperature rise,melting grain structure,and ultimately leading to puncture failure.This study provides a new perspective for understanding the failure mechanism of ZnO varistors and lays a theoretical foundation for the development of varistor materials with high energy absorption capacity. 展开更多
关键词 zno varistors spinels multi field coupling simulation electrical failure pores mechanical electrical failure mechanisms thermal stress mechanical failure
Morphology evolution and breakdown mechanism of cross-linked polyethylene(XLPE)-silicone rubber(SiR)interface induced by silicone grease diffusion 认领 引用 被引量：15
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作者 Zerui Li Kai Zhou +5 位作者 Pengfei Meng Hao Yuan Zikang Wang Yidong Chen Yuan Li Guangya Zhu 《High Voltage》 SCIE EI CSCD 2022年第4期802-811,共10页
Silicone grease(SG)is used for lubrication during cable accessory installation and can penetrate into the silicone rubber(SiR),leading to properties deterioration of the SiR.In this study,the effects of SG on the brea... Silicone grease(SG)is used for lubrication during cable accessory installation and can penetrate into the silicone rubber(SiR),leading to properties deterioration of the SiR.In this study,the effects of SG on the breakdown characteristics of the cross-linked poly-ethylene(XLPE)-SiR interface are investigated.First,the variation of the XLPE-SiR interface breakdown voltage with SG coating time is experimentally explored.The interface breakdown voltage significantly increases after SG is applied,remains stable for coating times of up to approximately 144 h and then rapidly decreases;the minimum interface breakdown voltage is lower than that without the SG coating.Next,the effects of SG on the chemical composition and surface topography of the SiR are examined by infrared spectroscopy and optical profilometry,respectively.The SG penetration does not change the functional groups of the SiR but significantly increases its surface roughness.Finally,the interface electric-field distribution after coating with SG is analysed by finite-element simulation,revealing that the residual SG at the interface distorts the interface electric field after a long coating time.The increase in the SiR surface roughness caused by SG diffusion and the interface electric-field distortion caused by the residual SG together lead to the decrease of the interface breakdown voltage. 展开更多
关键词 coating interface diffusion
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