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学者姓名：喻志阳
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In industrial practice, combining grain growth inhibitors (GGIs) with low carbon content effectively restrains WC grain growth in WC-Co cemented carbides. However, the intricate relationship between carbon content, WC grain microstructure, and GGI impact remains unresolved. This study investigates two WC-Co sample sets, maintaining constant VC inhibitor levels but varying carbon content near upper (HC) and lower (LC) limits. SEM analysis revealed distinct morphologies: HC displayed truncated prism shapes, exposing long basal and prismatic terraces, while LC exhibited a saw-tooth morphology with finer grains. EBSD stereology quantified anisotropic WC grain growth, revealing suppressed growth perpendicular to both basal (HC: 0.51 μm vs. LC: 0.38 μm) and prismatic planes (HC: 0.44 μm vs. LC: 0.37 μm) with decreased carbon content. Atomic-resolution EDS showed higher V solute excess in LC at WC(basal)-Co, WC(prismatic)-Co interfaces, and step corners (HC: 4.6, 0.9, and 4.4 atoms/nm2; LC: 5.5, 0.9, and 7.8 atoms/nm2). Our findings elucidate a clear physical understanding that a low carbon content enhances V atom solubility within liquid cobalt, increasing the thickness of complexions to quad-layer on WC (basal)-Co interfaces and forming V-rich nanoprecipitates at step corners. Those inhibitory effects further limited step flow, resulting in pronounced step bunching and a saw-tooth fine-grained morphology in LC sample. This study highlights that complexions housing more inhibitory solute elements exert a stronger drag effect on grain growth front migration. This approach has the potential for studying grain growth in anisotropic materials, highlighting the importance of constructing experimental complexion diagrams in engineering fine-structured ceramics and metals. © 2024 Elsevier Ltd and Techna Group S.r.l.
Keyword ：
Aberration-corrected STEM Aberration-corrected STEM Carbon content Carbon content Cemented carbide Cemented carbide Complexion Complexion Grain growth inhabitation Grain growth inhabitation
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| GB/T 7714 | Lai, W. , Ye, X. , Lei, H. et al. More microscopic interfacial segregation slowers macroscopic grain growth: A case in WC-Co cemented carbides [J]. | Ceramics International , 2024 , 50 (15) : 26654-26662 . |
| MLA | Lai, W. et al. "More microscopic interfacial segregation slowers macroscopic grain growth: A case in WC-Co cemented carbides" . | Ceramics International 50 . 15 (2024) : 26654-26662 . |
| APA | Lai, W. , Ye, X. , Lei, H. , Zheng, W. , Xiang, C. , Cheng, W. et al. More microscopic interfacial segregation slowers macroscopic grain growth: A case in WC-Co cemented carbides . | Ceramics International , 2024 , 50 (15) , 26654-26662 . |
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Owing to the large exciton binding energy(＞100 meV)of most organic materials,the process of exciton dissociation into free electrons and holes is seriously hindered,which plays a key role in the photocat-alytic system.In this study,a series of chalcogen(S,Se)-substituted mesoporous covalent organic frame-works(COFs)have been synthesized for enhanced photocatalytic organic transformations.Photoelectro-chemical measurements indicate that the introduction of semi-metallic Se atom and the enlargement of conjugation degree can not only reduce the exciton binding energy accelerating the charge separation,but also reduce the band gap of COFs.As a result,the COF-NUST-36 with the lowest exciton binding energy(39.5 meV)shows the highest photocatalytic performance for selective oxidation of amines(up to 98％Conv.and 97.5％Sel.).This work provides a feasible method for designing COFs with high photocatalytic activity by adjusting exciton binding energy.
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| GB/T 7714 | Zhangjie Gu , Zhen Shan , Yulan Wang et al. Tuning the exciton binding energy of covalent organic frameworks for efficient photocatalysis [J]. | 中国化学快报（英文版） , 2024 , 35 (2) : 577-583 . |
| MLA | Zhangjie Gu et al. "Tuning the exciton binding energy of covalent organic frameworks for efficient photocatalysis" . | 中国化学快报（英文版） 35 . 2 (2024) : 577-583 . |
| APA | Zhangjie Gu , Zhen Shan , Yulan Wang , Jinjian Wang , Tongtong Liu , Xiaoming Li et al. Tuning the exciton binding energy of covalent organic frameworks for efficient photocatalysis . | 中国化学快报（英文版） , 2024 , 35 (2) , 577-583 . |
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Materials that can provide reliable electromagnetic interference (EMI) shielding in highly oxidative atmosphere at elevated temperature are indispensable in the fast-developing aerospace field. However, most of conductor-type EMI shielding materials such as metals can hardly withstand the high-temperature oxidation, while the conventional dielectric-type materials cannot offer sufficient shielding efficiency in gigahertz (GHz) frequencies. Here, a highly deficient medium-entropy (ME) perovskite ceramic as an efficient EMI shielding material in harsh environment, is demonstrated. The synergistic effect of entropy stabilization and aliovalent substitution on A-site generate abnormally high concentration of Ti and O vacancies that are stable under high-temperature oxidation. Due to the clustering of vacancies, the highly deficient perovskite ceramic exhibits giant complex permittivity and polarization loss in GHz, leading to the specific EMI shielding effectiveness above 30 dB/mm in X-band even after 100 h of annealing at 1000 degrees C in air. Along with the low thermal conductivity, the aliovalent ME perovskite can serve as a bifunctional shielding material for applications in aircraft engines and reusable rockets. A highly deficient medium-entropy perovskite ceramic has developed as an efficient electromagnetic interference shielding material in harsh environment. The high concentration of Ti-O vacancy clusters formed under the synergistic effect of aliovalent substitution and entropy effect enables the material to serve as an bifunctional shielding material for electromagnetic wave and heat. image
Keyword ：
aliovalent substitution aliovalent substitution electromagnetic interference shielding electromagnetic interference shielding harsh environment harsh environment medium-entropy ceramic medium-entropy ceramic vacancies vacancies
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| GB/T 7714 | Liu, Yongping , Tuo, Ping , Dai, Fu-Zhi et al. A Highly Deficient Medium-Entropy Perovskite Ceramic for Electromagnetic Interference Shielding under Harsh Environment [J]. | ADVANCED MATERIALS , 2024 , 36 (28) . |
| MLA | Liu, Yongping et al. "A Highly Deficient Medium-Entropy Perovskite Ceramic for Electromagnetic Interference Shielding under Harsh Environment" . | ADVANCED MATERIALS 36 . 28 (2024) . |
| APA | Liu, Yongping , Tuo, Ping , Dai, Fu-Zhi , Yu, Zhiyang , Lai, Wei , Ding, Qi et al. A Highly Deficient Medium-Entropy Perovskite Ceramic for Electromagnetic Interference Shielding under Harsh Environment . | ADVANCED MATERIALS , 2024 , 36 (28) . |
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Single-atom catalysis (SAC) attracts wide interest for zinc-air batteries that require high-performance bifunctional electrocatalysts for oxygen reactions. However, catalyst design is still highly challenging because of the insufficient driving force for promoting multiple-electron transfer kinetics. Herein, we report a superstructure-assisted SAC on tungsten carbides for oxygen evolution and reduction reactions. In addition to the usual single atomic sites, strikingly, we reveal the presence of highly ordered Co superstructures in the interfacial region with tungsten carbides that induce internal strain and promote bifunctional catalysis. Theoretical calculations show that the combined effects from superstructures and single atoms strongly reduce the adsorption energy of intermediates and overpotential of both oxygen reactions. The catalyst therefore presented impressive bifunctional activity with an ultralow potential gap of 0.623 V and delivered a high power density of 188.5 mW cm(-2) for assembled zinc-air batteries. This work opens up new opportunities for atomic catalysis.
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| GB/T 7714 | Li, Hongguan , Wang, Wu , Xue, Sikang et al. Superstructure-Assisted Single-Atom Catalysis on Tungsten Carbides for Bifunctional Oxygen Reactions [J]. | JOURNAL OF THE AMERICAN CHEMICAL SOCIETY , 2024 , 146 (13) : 9124-9133 . |
| MLA | Li, Hongguan et al. "Superstructure-Assisted Single-Atom Catalysis on Tungsten Carbides for Bifunctional Oxygen Reactions" . | JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 146 . 13 (2024) : 9124-9133 . |
| APA | Li, Hongguan , Wang, Wu , Xue, Sikang , He, Jiarui , Liu, Chen , Gao, Guangying et al. Superstructure-Assisted Single-Atom Catalysis on Tungsten Carbides for Bifunctional Oxygen Reactions . | JOURNAL OF THE AMERICAN CHEMICAL SOCIETY , 2024 , 146 (13) , 9124-9133 . |
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Thermocatalytic nonoxidative ethane dehydrogenation(EDH)is a promising strategy for ethene produc-tion but suffers from intense energy consumption and poor catalyst durability;exploring technology that permits efficient EDH by solar energy remains a giant challenge.Herein,we present that an oxygen va-cancy(Ov)-rich LaVO4(LaV04-Ov)catalyst is highly active and stable for photocatalytic EDH,through a dynamic lattice oxygen(Olatt.)and Ov co-mediated mechanism.Irradiated by simulated sunlight at mild conditions,LaVO4-Ov effectively dehydrogenates undiluted ethane to produce C2H4 and CO with a con-version of 2.3％.By loading a small amount of Pt cocatalyst,the evolution and selectivity of C2H4 are en-hanced to 275 μmol h-1 g-1 and 96.8％.Of note,LaVO4-Ov appears nearly no carbon deposition after the reaction.The isotope tracked reactions reveal that the consumed Olatt.recuperates by exposing the used catalyst with O2,thus establishing a dynamic cycle of Olatt,and achieving a facile catalyst regeneration to preserve its intrinsic activity.The refreshed LaVO4-Ov exhibits superior reusability and delivers a turnover number of about 305.The Ov promotes photo absorption,boosts ethane adsorption/activation,and accel-erates charge separation/transfer,thus improving the photocatalytic efficiency.The possible photocatalytic EDH mechanism is proposed,considering the key intermediates predicted by density functional theory(DFT)and monitored by in-situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS).
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| GB/T 7714 | Fen Wei , Weichao Xue , Zhiyang Yu et al. Dynamic cooperations between lattice oxygen and oxygen vacancies for photocatalytic ethane dehydrogenation by a self-restoring LaVO4 catalyst [J]. | 中国化学快报（英文版） , 2024 , 35 (3) : 171-176 . |
| MLA | Fen Wei et al. "Dynamic cooperations between lattice oxygen and oxygen vacancies for photocatalytic ethane dehydrogenation by a self-restoring LaVO4 catalyst" . | 中国化学快报（英文版） 35 . 3 (2024) : 171-176 . |
| APA | Fen Wei , Weichao Xue , Zhiyang Yu , Xue Feng Lu , Sibo Wang , Wei Lin et al. Dynamic cooperations between lattice oxygen and oxygen vacancies for photocatalytic ethane dehydrogenation by a self-restoring LaVO4 catalyst . | 中国化学快报（英文版） , 2024 , 35 (3) , 171-176 . |
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Hybridizing two heterocomponents to construct a built-in electric field (BIEF) at the interface represents a significant strategy for facilitating charge separation in carbon dioxide (CO2)-photoreduction. However, the unidirectional nature of BIEFs formed by various low-dimensional materials poses challenges in adequately segregating the photogenerated carriers produced in bulk. In this study, leveraging zinc oxide (ZnO) nanodisks, a sulfurization reaction is employed to fabricate Z-scheme ZnO/zinc sulfide (ZnS) heterojunctions featuring a multiple-order BIEF. These heterojunctions reveal distinctive interfacial structures characterized by two semicoherent phase boundaries. The cathodoluminescence 2D maps and density functional theory calculation results demonstrate that the direction of the multiple-order BIEF spans from ZnS to ZnO. This directional alignment significantly fosters the spatial separation of photogenerated electrons and holes within ZnS nanoparticles and enhances CO2-to-carbon monoxide photoreduction performance (3811.7 mu mol h(-1) g(-1)). The findings present a novel pathway for structurally designing BIEFs within heterojunctions, while providing fresh insights into the migratory behavior of photogenerated carriers across interfaces.
Keyword ：
built-in electric field built-in electric field CO2 photoreduction CO2 photoreduction heterojunctions heterojunctions interfacial structures interfacial structures photocatalysis photocatalysis
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| GB/T 7714 | Xue, Sikang , Tang, Hao , Shen, Min et al. Establishing Multiple-Order Built-In Electric Fields Within Heterojunctions to Achieve Photocarrier Spatial Separation [J]. | ADVANCED MATERIALS , 2024 . |
| MLA | Xue, Sikang et al. "Establishing Multiple-Order Built-In Electric Fields Within Heterojunctions to Achieve Photocarrier Spatial Separation" . | ADVANCED MATERIALS (2024) . |
| APA | Xue, Sikang , Tang, Hao , Shen, Min , Liang, Xiaocong , Li, Xiaoyan , Xing, Wandong et al. Establishing Multiple-Order Built-In Electric Fields Within Heterojunctions to Achieve Photocarrier Spatial Separation . | ADVANCED MATERIALS , 2024 . |
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Nanoconfined catalysts enhance stabilization of reaction intermediates, facilitate electron transfer, and safeguard active centers, leading to superior electrocatalytic activity, particularly in CO2 reduction reactions (CO2RR). Despite their effectiveness, crafting nanoconfined catalysts is challenging due to unclear formation mechanisms. In this study, we introduce an electrochemical method to grow Pd clusters within the interlayers of two-dimensional black phosphorus, creating Pd cluster-intercalated black phosphorus (Pd-i-BP) as an electrocatalyst. Using in situ electrochemical liquid phase transmission electron microscopy (EC-TEM), we revealed the synthesis mechanism of Pd-i-BP, involving electrochemically driven Pd ion intercalation followed by reduction within the BP layers. The Pd-i-BP electrocatalyst exhibits exemplary CO2-to-formate conversion, achieving 90% Faradaic efficiency for formate production, owing to its distinct nanoconfined structure that stabilizes intermediates and enhances electron transfer. Density functional theory (DFT) calculations underscore the structural benefits for enhancing intermediate adsorption and catalyzing the reaction. Our insights deepen understanding of nanoconfined material synthesis, promising advanced, high-efficiency catalysts.
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| GB/T 7714 | Xiao, Liangping , Zheng, Qizheng , Luo, Shiwen et al. Pd-intercalated black phosphorus: An efficient electrocatalyst for CO2 reduction [J]. | SCIENCE ADVANCES , 2024 , 10 (25) . |
| MLA | Xiao, Liangping et al. "Pd-intercalated black phosphorus: An efficient electrocatalyst for CO2 reduction" . | SCIENCE ADVANCES 10 . 25 (2024) . |
| APA | Xiao, Liangping , Zheng, Qizheng , Luo, Shiwen , Ying, Yifan , Zhou, Rusen , Zhou, Shiyuan et al. Pd-intercalated black phosphorus: An efficient electrocatalyst for CO2 reduction . | SCIENCE ADVANCES , 2024 , 10 (25) . |
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Photocatalytic ozonation emerges as an appealing approach for wastewater purification. However, the kinetic constraints associated with the charge separation and the ozone activation hinder the advancement of photocatalytic ozonation systems. Herein, we prepared CeO2 photocatalysts with predominantly exposed {1 1 0}, {1 0 0}, or {1 1 1} facets, highlighting the synergy role of crystal facet and oxygen vacancies in manipulating electron transfer and ozone activation. The CeO2-{1 1 0} catalyst exhibits the best efficiency for phenol mineralization (69%) in photocatalytic ozonation. Ex-situ, Quasi-situ, and In-situ characterization of the CeO2 catalysts reveal that facet engineering in the CeO2 catalysts optimizes the electronic properties of the catalysts, thereby enhancing the separation of photogenerated charge carriers and transfer of electrons and holes, which provides more electrons for O3 activation and promotes the formation of reactive oxygen species (ROS). Moreover, facet modulating leads to a change in the density of surface oxygen vacancies. The increased oxygen vacancy density on the CeO2-{1 1 0} surface accelerates the activation of O3 and the formation of adsorbed oxygen (*O), synergistically boosting the production rate of ROS. The present study offers valuable insights into the design of efficient photocatalysts for wastewater purification. © 2024 Elsevier Inc.
Keyword ：
CeO2 CeO2 Crystal facet Crystal facet Oxygen vacancies Oxygen vacancies Photocatalytic ozonation Photocatalytic ozonation Synergistic effect Synergistic effect
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| GB/T 7714 | Yang, Z. , Xu, R. , Tao, H. et al. Crystal facet and oxygen vacancies synergistically mediate photocatalytic ozonation for organic pollutants removal over CeO2 [J]. | Journal of Catalysis , 2024 , 438 . |
| MLA | Yang, Z. et al. "Crystal facet and oxygen vacancies synergistically mediate photocatalytic ozonation for organic pollutants removal over CeO2" . | Journal of Catalysis 438 (2024) . |
| APA | Yang, Z. , Xu, R. , Tao, H. , Yang, Y. , Hou, Y. , Wang, K. et al. Crystal facet and oxygen vacancies synergistically mediate photocatalytic ozonation for organic pollutants removal over CeO2 . | Journal of Catalysis , 2024 , 438 . |
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Adsorption and activation of C-H bonds by photocatalysts are crucial for the efficient conversion of C-H bonds to produce high-value chemicals. Nevertheless, the delivery of surface-active oxygen species for C-H bond oxygenation inevitably needs to overcome obstacles due to the separated active centers, which suppresses the catalytic efficiency. Herein, Ni dopants are introduced into a monolayer Bi2WO6 to create cascaded active units consisting of unsaturated W atoms and Bi/O frustrated Lewis pairs. Experimental characterizations and density functional theory calculations reveal that these special sites can establish an efficient and controllable C-H bond oxidation process. The activated oxygen species on unsaturated W are readily transferred to the Bi/O sites for C-H bond oxygenation. The catalyst with a Ni mass fraction of 1.8% exhibits excellent toluene conversion rates and high selectivity towards benzaldehyde. This study presents a fascinating strategy for toluene oxidation through the design of efficient cascaded active units.
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| GB/T 7714 | Shi, Yingzhang , Li, Peng , Chen, Huiling et al. Photocatalytic toluene oxidation with nickel-mediated cascaded active units over Ni/Bi2WO6 monolayers [J]. | NATURE COMMUNICATIONS , 2024 , 15 (1) . |
| MLA | Shi, Yingzhang et al. "Photocatalytic toluene oxidation with nickel-mediated cascaded active units over Ni/Bi2WO6 monolayers" . | NATURE COMMUNICATIONS 15 . 1 (2024) . |
| APA | Shi, Yingzhang , Li, Peng , Chen, Huiling , Wang, Zhiwen , Song, Yujie , Tang, Yu et al. Photocatalytic toluene oxidation with nickel-mediated cascaded active units over Ni/Bi2WO6 monolayers . | NATURE COMMUNICATIONS , 2024 , 15 (1) . |
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Defect engineering has been widely applied in semiconductors to improve photocatalytic properties by altering the surface structures. This study is about the transformation of inactive WO 3 nanosheets to a highly effective CO 2 - to - CH 4 conversion photocatalyst by introducing surface - ordered defects in abundance. The nonstoichiometric WO 3 - x samples were examined by using aberration - corrected electron microscopy. Results unveil abundant surface - ordered terminations derived from the periodic {013} stacking faults with a defect density of 20.2%. The {002} surface - ordered line defects are the active sites for fixation CO 2 , transforming the inactive WO 3 nanosheets into a highly active catalyst (CH 4 : O 2 = 8.2: 16.7 mu mol h -1 ). We believe that the formation of the W - O - C - W - O species is a critical step in the catalytic pathways. This work provides an atomic - level comprehension of the structural defects of catalysts for activating small molecules.
Keyword ：
CO 2 conversion CO 2 conversion induced polarization induced polarization photocatalysis photocatalysis surface- ordered defects surface- ordered defects unsaturated coordination unsaturated coordination
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| GB/T 7714 | Xue, Sikang , Wei, Changgeng , Shen, Min et al. Enriching surface- ordered defects on WO3 for photocatalytic CO2-to-CH4 conversion by water [J]. | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA , 2024 , 121 (18) . |
| MLA | Xue, Sikang et al. "Enriching surface- ordered defects on WO3 for photocatalytic CO2-to-CH4 conversion by water" . | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 121 . 18 (2024) . |
| APA | Xue, Sikang , Wei, Changgeng , Shen, Min , Liang, Xiaocong , Wang, Jiali , Yang, Can et al. Enriching surface- ordered defects on WO3 for photocatalytic CO2-to-CH4 conversion by water . | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA , 2024 , 121 (18) . |
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