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Heterostructured Pd/PdO nanowires for selective and efficient CO_(2) electroreduction to CO

Journal of Energy Chemistry 2022年第7期31卷 407-413,I0011页

作者： Tian-Jiao Wang Wen-Sheng Fang Yi-Ming Liu Fu-Min Li Pei Chen Yu Chen Key Laboratory of Macromolecular Science of Shaanxi Province Key Laboratory of Applied Surface and Colloid Chemistry(Ministry of Education)Shaanxi Key Laboratory for Advanced Energy DevicesSchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710062ShaanxiChina School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074HubeiChina

Palladium(Pd) nanostructures are highly promising electrocatalysts for the carbon dioxide electrochemical reduction(CO_(2) ER). At present, it is still challenge for the synthesis of Pd nanostructures with high activity, selectivity and stability. In this work, a facile PdII-complex pyrolysis method is applied to synthesize the high-quality one-dimensional heterostructured Pd/Pd O nanowires(Pd/Pd O H-NWs).The as-prepared Pd/Pd O H-NWs have a large electrochemically active surface area, abundant defects and Pd/Pd O heterostructure. Electrochemical measurement results reveal that Pd/Pd O H-NWs exhibit up to 94% CO Faraday efficiency with a current density of 11.6 m A cm^(-2) at an applied potential of -0.8 V. Meanwhile, Pd/Pd O H-NWs can achieve a stable catalytic process of 12 h for CO_(2) ER. Such outstanding CO_(2) ER performance of Pd/Pd O H-NWs has also been verified in the flow cell test. The density functional theory calculations indicate that Pd/Pd O heterostructure can significantly weaken the CO adsorption on Pd sites, which improves the CO tolerance and consequently enhances the catalytic performance of Pd/Pd O H-NWs for CO_(2) ER. This work highlights a facile complex pyrolysis strategy for the synthesis of Pd-based CO_(2) ER catalysts and provides a new application instance of metal/metal oxide heterostructure in electrocatalysis.

关键词： Pd/PdO nanowires Heterostructure Carbon dioxide electrochemical reduction Carbon monoxide Faraday efficiency

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CMAS-phobic and infiltration-inhibiting protective layer material for thermal barrier coatings

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Journal of advanced Ceramics 2024年第8期13卷 1254-1267页

作者： Shjun Meng Lei Guo Hongbo Guo Yuanpeng Wang Hongli Liu School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Tianjin Key Laboratory of Advanced Joining Technology Key Lab of Advanced Ceramics and Machining Technology of Ministry of EducationTianjin300072China School of Materials Science and Engineering Beihang UniversityBeijing 100191China College of Aeronautical Engineering Civil Aviation University of ChinaTianjin 300300China

Calcium-magnesium-alumina-silicate(CMAS)corrosion has attracted special attention in the thermal barrier coating(TBC)*** high temperatures,when CMAS melts,it adheres to the coating surface and penetrates the interior,severely destroying the *** this study,a promising CMAS-phobic and infiltration-inhibiting material,GdPO4,on which molten CMAs is difficult to wet and penetrate,was *** desirable attributes are explained by analyzing the material characteristics of GdPO_(4) and its interfacial reaction with ***4 is demonstrated to have low surface energy,making it difficult for molten CMAS to wet and adhere to the *** in contact with molten CMAS,a double-layer structured reaction layer consisting of an acicular upper sublayer and a compact lower sublayer is formed on the GdPO4 surface,which can effectively impede molten CMAS spreading and ***-principles calculation results revealed that the reaction layer has low surface energy and low adhesion to CMAS,which are favorable for molten CMAS ***,the formation of the reaction layer increases the viscosity of the molten CMAS,which can increase melt wetting and ***,GdPO4,which exhibits excellent CMAS-phobicity and infiltration-inhibiting ability,is a promising protective layer material for TBCs against CMAS adhesion and attack.

关键词： thermal barrier coatings(TBCs) calcium-magnesium-alumina-silicate(CMAS)-phobicity GdPO_(4) interface reaction layer first-principles calculation

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Preparation of disulfide bond-rich porous hypercrosslinked polymers for the efficient adsorption of trace methylmercury at ppb levels in aqueous solutions

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Chemical engineering Journal 2025年

作者： Huayu Liu Lijia Liu Yudan Wang Fanshuai Gao Yawen Liu Key Laboratory of Superlight Materials & Surface Technology Ministry of Education Institute of Advanced Marine Materials College of Materials Science and Chemical Engineering Harbin Engineering University Harbin 150001 China Yantai Research Institute of Harbin Engineering University Yantai 264006 China

Methylmercury (CH 3 Hg + ) is present at low levels in natural waters and is difficult to remove. Here, an organic hypercrosslinked porous polymer material (HCP-DS) enriched with disulfide bonds was designed and synthesized from dibenzyl disulfide via a Friedel-Crafts alkylation reaction. The resulting material demonstrated a high efficiency to remove methylmercury from water at ppb levels. The adsorption capacity reached 1174.765 μg·g −1 at an initial methylmercury concentration of 500 μg·L −1 . Notably, the material maintained excellent adsorption capacity across a wide pH range, in the range of pH = 5–12, the removal rate (R) of methylmercury can get over 95.56 %, even at pH = 2 or 13 it could get the removal rate over 85.08 %. HCP-DS proves great environmental adaptability, even in the presence of other metal cations or high ionic strength in aqueous environments, HCP-DS exhibited robust adsorption of trace methylmercury. Furthermore, the material demonstrated excellent reusability, maintaining high performance over five adsorption–desorption cycles. Importantly, HCP-DS effectively adsorbed methylmercury in the presence of organic matter (R > 89.24 %), it also performs an excellent capacity to remove methylmercury in a variety of natural water environments such as seawater, surface water, and groundwater underscoring its potential for practical applications in water purification.

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120 mm Single-crystalline perovskite and wafers： towards viable applications

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Science China Chemistry 2017年第10期60卷 1367-1376页

作者： Yucheng Liu Xiaodong Ren Jing Zhang Zhou Yang Dong Yang Fengyang Yu Jiankun Sun Changming Zhao Zhun Yao Bo Wang Qingbo Wei Fengwei Xiao Haibo Fan Hao Deng Liangping Deng Shengzhong (Frank) Liu Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Laboratory for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 China iChEM Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China Xi'an LONGI Silicon Materials Corporation Xi 'an 710100 China

As the large single-crystalline silicon wafers have revolutionized many industries including electronics and solar cells, it is envisioned that the availability of large single-crystalline perovskite crystals and wafers will revolutionize its broad applications in photovoltaics, optoelectronics, lasers, photodetectors, light emitting diodes(LEDs), etc. Here we report a method to grow large single-crystalline perovskites including single-halide crystals: CH3NH3PbX3(X=I, Br, Cl), and dual-halide ones:CH3NH3Pb(ClxBr1.x)3 and CH3NH3Pb(BrxI1.x)3, with the largest crystal being 120 mm in length. Meanwhile, we have advanced a process to slice the large perovskite crystals into thin wafers. It is found that the wafers exhibit remarkable features:(1)its trap-state density is a million times smaller than that in the microcrystalline perovskite thin films(MPTF);(2) its carrier mobility is 410 times higher than its most popular organic counterpart P3HT;(3) its optical absorption is expanded to as high as910 nm comparing to 797 nm for the MPTF;(4) while MPTF decomposes at 150 °C, the wafer is stable at high temperature up to270 °C;(5) when exposed to high humidity(75% RH), MPTF decomposes in 5 h while the wafer shows no change for overnight;(6) its photocurrent response is 250 times higher than its MPTF counterpart. A few electronic devices have been fabricated using the crystalline wafers. Among them, the Hall test gives low carrier concentration with high mobility. The trap-state density is measured much lower than common semiconductors. Moreover, the large SC-wafer is found particularly useful for mass production of integrated circuits. By adjusting the halide composition, both the optical absorption and the light emission can be fine-tuned across the entire visible spectrum from 400 nm to 800 nm. It is envisioned that a range of visible lasers and LEDs may be developed using the dual-halide perovskites. With fewer trap states, high mobility, broader absorption, and humidity

关键词： single-crystal growth perovskite wafer IC devices photodetector array

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Lightweight and high EMI shielding performed ZrB 2 -SiC/CF@Epoxy-Fe 3 O 4 composites with carbonated cotton fibers

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Journal of Alloys and Compounds 2025年 1030卷

作者： Muhammad Waseem Xiaoli Zhang WenBo Wang Somavia Ameen Kun Li Xiaoqin Guo Jingbo Chen School of Materials Science and Engineering National Engineering Research Center for Advanced Polymer Processing Technology Zhengzhou University Zhengzhou 450001 China Department of Chemistry School of Science Tianjin Key Laboratory of Molecular Optoelectronic Science Tianjin University Tianjin 300072 China Henan Key Laboratory of Aeronautical Materials and Application Technology Zhengzhou University of Aeronautics Zhengzhou 450046 China

Fast development of information science and electronic technology, as well as the use of related equipment have been inducing unavoidable electromagnetic wave (EMW) pollution. High performed electromagnetic interference (EMI) shielding composites are required for weakening or resolving such problems. In this study, we aimed to prepare lightweight and porous composites with high EMI effectiveness, especially under relatively high service temperature condition. Silicon carbide (SiC) and zirconium diboride (ZrB 2 ) were compounded with cotton fibers (CFs) to prepare ZrB 2 -SiC/CF compounds, cooperated with high-temperature sintering technique at 800 °C–1200 °C. Furthermore, epoxy resin dipping was applied to improve the mechanical property, combining with Fe 3 O 4 nanoparticle’ coating on their surface to enhance the EMI shielding performance. Average EMI shielding efficiency of the ZrB 2 -SiC/60CF@Epoxy-Fe 3 O 4 with a thickness of 1.54 mm was as high as 58.93 dB, at a frequency range of 18–26 GHz. High dielectric loss induced by carbonated CFs, magnetic loss from Fe 3 O 4 nanoparticles, as well as the porous structure contributed to this high EMI shielding performance. The MATLAB software was used to further exam the SEM pictures before and after sintering and helped to explain the change in composite’s porosity and morphology, as well as their influence on the EMI shielding performance.

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Research progress of p-type Fe-based skutterudite thermoelectric materials

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Frontiers of Materials Science 2021年第3期15卷 317-333页

作者： Xin TONG Zhiyuan LIU Jianglong ZHU Ting YANG Yonggui WANG Ailin XIA Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials(Ministry of Education) Anhui University of TechnologyMaanshan 243002China School of Materials Science and Engineering Anhui University of TechnologyMaanshan 243002China

Filled skutterudite is currently one of the most promising intermediate-temperature thermoelectric(TE)materials,having good thermoelectric transport performance and excellent mechanical *** the preparation of high-efficiency filled skutterudite TE devices,it is important to have p-and n-type filled skutterudite TE materials with matching ***,the current TE properties of p-type Fe-based filled skutterudite materials are worse than n-type filled skutterudite ***,how to obtain high-performance p-type Fe-based filled skutterudite materials is the key to preparation of high-efficiency skutterudite-based TE *** review summarizes some methods for optimizing the thermal transport performance of p-type filled skutterudite materials at the atomic-molecular and nano-mesoscopic scale that have been used in recent *** methods include doping,multi-atom filling,and use of low-dimensional structure and of *** addition,the synergistic optimization methods of the electrical and thermal transport parameters and advanced preparation technologies of p-type filled skutterudite materials in recent years are also briefly *** optimizational methods and advanced preparation technologies can significantly improve the TE properties of p-type Fe-based filled skutterudite materials.

关键词： p-type Fe-based filled skutterudite lattice thermal conductivity synergistic optimization preparation technology thermoelectric property

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Recent Advances in Wide-Bandgap Organic-Inorganic Halide Perovskite Solar Cells and Tandem Application

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Nano-Micro Letters 2023年第5期15卷 254-297页

作者： Ting Nie Zhimin Fang Xiaodong Ren Yuwei Duan Shengzhong(Frank)Liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710119China Dalian National Laboratory for Clean Energy iChEMDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

Perovskite-based tandem solar cells have attracted increasing interest because of its great potential to surpass the Shockley-Queisser limit set for single-junction solar *** the tandem architectures,the wide-bandgap(WBG)perovskites act as the front absorber to offer higher open-circuit voltage(VOC)for reduced thermalization *** advantage of tunable bandgap of the perovskite materials,the WBG perovskites can be easily obtained by substituting halide iodine with bromine,and substituting organic ions FA and MA with *** date,the most concerned issues for the WBG perovskite solar cells(PSCs)are huge VOC deficit and severe photo-induced phase *** VOC loss and improving photostability of the WBG PSCs are crucial for further efficiency ***,scientists have made great efforts to overcome these key issues with tremendous *** this review,we first summarize the recent progress of WBG perovskites from the aspects of compositions,additives,charge transport layers,interfaces and preparation *** key factors affecting efficiency and stability are then carefully discussed,which would provide decent guidance to develop highly efficient and stable WBG PSCs for tandem application.

关键词： Efficiency Perovskite Solar cell Stability Wide-bandgap

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advanced research on the preparation and application of carbide ceramic fibers

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Journal of advanced Ceramics 2024年第9期13卷 1291-1336页

作者： Zhongqian Zhao Wei Liao Jing Chen Jian Jiao Cuilan Wu Yanzi Gou Science and Technology on Advanced Ceramic Fibers and Composites Laboratory College of Aerospace Science and EngineeringNational University of Defense TechnologyChangsha 410073China Centre for High-Resolution Electron Microscopy College of Materials Science and EngineeringHunan UniversityChangsha 410082China National Key Laboratory of Advanced Composites AECC Beijing Institute of Aeronautical MaterialsBeijing 100095China

Carbide ceramic fibers are of significant importance for application in the high-tech areas of advanced aircraft engines,aerospace vehicles,and the nuclear industry due to their excellent properties,such as high tensile strength and elastic modulus,excellent high-temperature resistance,and oxidation *** paper reviews the preparation and application of different carbide ceramic fibers,including SiC fibers and transition metal carbide(e.g.,ZrC,HfC,and TaC)ceramic *** preparation methods of carbide ceramic fibers are discussed in terms of different fiber diameters,represented by SiC fibers with variable weaving properties and functions due to their differences in ***,the application of carbide ceramic fibers as high-temperature-resistant structural materials,catalyst carriers,sensors,and supercapacitors are summarized,and strategies for the future development of carbide ceramic fibers are *** review aims to help researchers enhance their understanding of the preparation and utilization of carbide ceramic micro/nanofibers,advancing the development of high-performance carbide ceramic fibers.

关键词： carbide ceramic fibers SiC fibers boron carbide(B_(4)C)fibers ultra-high temperature ceramics SiC ceramic fiber-reinforced SiC(SiCf/SiC)composites

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Formation mechanism of interfacial microstructures and mechanical properties of Ti2AlNb/Ni-based superalloy joints brazed with NiCrFeSiB filler metal

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Progress in Natural Science:Materials International 2021年第2期31卷 310-318页

作者： Haishui Ren Xinyu Ren Weimin Long Bo Chen Shujie Pang Huaping Xiong Welding and Plastic Forming Division Beijing Institute of Aeronautical Materials State Key Laboratory of Advanced Brazing Filler Metals and Technology Zhengzhou Research Institute of Mechanical Engineering Department of Material Science and Engineering Beihang University

Dissimilar brazing of Ti2AlNb-based alloy and Ni-based wrought superalloy（GH536） was studied using NiCrFeSiB filler metal. The Ti2AlNb/GH536 joints were analyzed by scanning electron microscope（SEM） equipped with an electron probe micro-analyzer（EPMA）, X-ray diffraction（XRD） and transmission electron microscopy（TEM）. The formation mechanism of interfacial microstructure and mechanical properties of Ti2AlNb/GH536 joints were studied. The results indicated that Ti2Ni（Al,Nb）, AlNi2Ti and TiB2reaction layers were formed in the joint adjacent to Ti2AlNb base metal. These layers resulted in high micro-hardness and the weak link of the joint. γ solid solution was formed through isothermal solidification and β1-Ni3Si phase precipitated in the γ solid solution during cooling process. Ni3B, β1-Ni3Si and CrB phases appeared in the centre of the joint. Blocky and needle-like borides formed within the diffusion affected zone of GH536 base alloy. The maximum tensile strength of Ti2AlNb/GH536 joints reached 425 MPa at room temperature and the strength value of 373 MPa was maintained at 923 K.

关键词： Ti2AlNb alloy Ni-based superally Brazing Microstructure Mechanical properties

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Corrosion mechanism of Mg alloys involving elongated long-period stacking ordered phase and intragranular lamellar structure

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Journal of Materials Science & technology 2023年第20期151卷 190-203页

作者： Jinshu Xie Jinghuai Zhang Zhi Zhang Zijian Yu Zhihao Xu Ru Wang Daqing Fang Xiaobo Zhang Xiaoru Zhang Ruizhi Wu Key Laboratory of Superlight Material and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing Institute of TechnologyNanjing 211167China

It is a long-term challenge to further improve the corrosion resistance while ensuring the strength of magnesium(Mg)*** the effect of potential fluctuation on the micro-galvanic corrosion and the subsequent film formation is important for understanding the corrosion mechanism of Mg alloys with multiple strengthening phases/***,we prepared the high-strength Mg-14.4Er-1.44Zn-0.3Zr(wt.%)alloys containing hybrid structures,i.e.,elongated long-period stacking ordered(LPSO)blocks+intragranular stacking faults(SFs)/LPSO *** Mg alloy with elongated LPSO blocks and intragranular LPSO lamellae(EZ-500 alloy)obtains good corrosion resistance(2.2 mm y^(–1)),while the Mg alloy containing elongated LPSO blocks and intragranular SFs(EZ-400 alloy)shows a significantly higher corrosion rate(6.9 mm y^(–1)).The results of scanning Kelvin probe force microscopy(SKPFM)show the elongated LPSO blocks act as cathode phase(87 mV in EZ-400 alloy),and the SFs serve as the weak anode(30 mV in EZ-400 alloy),resulting in high potential fluctuation in EZ-400 *** the contrary,both elongated blocks and intragranular lamellae are cathodic LPSO phase(67–69 mV)in EZ-500 alloy,leading to a lower potential *** in-situ atomic force microscope(AFM)observation indicates that high potential fluctuation would cause strong micro-galvanic corrosion,and subsequently leads to the failure in rapid formation of corrosion film,finally forming a loose and porous film,while relatively low potential fluctuation could result in more uniform corrosion mode and facilitate the rapid formation of protective ***,we propose that it is an effective way to develop high-strength corrosionresistant Mg alloys by controlling the potential fluctuation to form a“uniform potential”strengthening microstructure。

关键词： Mg alloys Stacking faults LPSO phase SKPFM Quasi in-situ AFM Corrosion behavior Potential fluctuation

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