Advanced Powder Materials最新文献_第2页

Networked γ′ in additively manufactured cobalt-based superalloy through dislocation cell-templated precipitation 位错模板沉淀在钴基高温合金中的网状γ′

Advanced Powder Materials

Pub Date : 2025-11-15 DOI: 10.1016/j.apmate.2025.100375

Zhifu Yao , Xintong Yang , Can Yang , Wenbin Qiu , Mujin Yang , Runhua Song , Yilu Zhao , Cuiping Wang , Zheng Zhong , Rongpei Shi , Shuai Wang , Tao Yang , Xingjun Liu

The cobalt-based γ′-strengthened superalloy shows great promise across various sectors, including power generation and aerospace. Laser powder bed fusion (LPBF) technology is well-suited to meet the requirements for superalloys with strong textures or single-crystal microstructures. However, post-processing often leads to recrystallization, altering the desired microstructure. In this study, we propose the dislocation cell-templated precipitation (DCP) method, which utilizes the elemental segregation at the high-density dislocation cell walls inherent in LPBF to control three-dimensional morphological evolution of γ′ phases. This process results in a unique networked γ′ structure in a newly developed cobalt-based superalloy (49Co-30Ni-10Al-5V-4Ta-2Ti at%), which is distinctly different from the conventional cubic γ′ phase morphology observed in cast samples. Compared with the conventional cubic γ′ morphology in cast alloys, the networked γ′ structure exhibits significantly enhanced strength at both room and elevated temperatures. Furthermore, the networked γ′ structure shows excellent thermal stability, retaining its morphology and columnar grains after 120 h at 1000 °C, without forming detrimental phases. These findings offer new insights into the microstructural engineering of LPBF-manufactured superalloys.

钴基γ′强化高温合金在包括发电和航空航天在内的各个领域显示出巨大的前景。激光粉末床熔合技术是一种适合于制备具有强织构或单晶组织的高温合金的技术。然而，后处理通常会导致再结晶，改变所需的微观结构。在这项研究中，我们提出了位错细胞模板沉淀（DCP）方法，该方法利用LPBF高密度位错细胞壁上的元素偏析来控制γ′相的三维形态演化。该过程导致新开发的钴基高温合金（49Co-30Ni-10Al-5V-4Ta-2Ti at%）具有独特的网状γ′结构，这与铸造样品中观察到的传统立方γ′相形态明显不同。与铸合金中传统的立方γ′形貌相比，网状γ′结构在室温和高温下均表现出显著增强的强度。此外，网状γ′结构表现出优异的热稳定性，在1000℃下加热120 h后仍保持其形态和柱状晶粒，而不会形成有害相。这些发现为lpbf制造的高温合金的微观结构工程提供了新的见解。

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引用次数: 0

Unlocking superior mechanical properties: the synergistic enhancement of hardness and fracture toughness in nanopolycrystalline tantalum diboride 解锁优越的机械性能：纳米多晶二硼化钽硬度和断裂韧性的协同增强

Advanced Powder Materials

Pub Date : 2025-11-11 DOI: 10.1016/j.apmate.2025.100374

Shuailing Ma , Yufei Ge , Min Lian , Xiao Ma , Pinwen Zhu , Akhil Tayal , Xingbin Zhao , Wei Li , Hao Song , Zihan Zhang , Yunxian Liu , Xiaobing Liu , Tian Cui

Achieving optimal mechanical properties, including hardness and fracture toughness, by controlling grain size is a fundamental and long-standing objective in the development of hard and superhard transition metal borides (TMBs) ceramics. It is expected that the mechanical performance of TMBs will be substantially enhanced in nano-crystalline ceramics. However, the fabrication of dense, nano-scale TMBs compacts presents challenges due to poor sintering behavior and pronounced grain growth at high temperature. Here, thanks to the pressure reduced activation energy effect, nano-polycrystalline tantalum diboride (NP-TaB₂) monoliths were fabricated under high pressure and moderate temperature conditions. These NP-TaB₂ bulks achieve dense microstructure with an average grain size as fine as 36 nm, due to the high nucleation rates and minimal grain growth induced by high pressure. With the decreasing of grain size, the hardness of NP-TaB₂ reaches up to 27.5 GPa by the Hall-Petch effect, making it nearly 45% harder than dense, micron-scale grain specimens. Additionally, the fracture toughness of NP-TaB₂ is enhanced by 70% at the same time in the nano scale specimens, attributed to the effective energy dissipation by nano grains through crack deflection, branching, and bridging, which enhances fracture toughness with synergistic hardness improvement. This discovery demonstrates that correlating grain size and microstructure with mechanical properties offers valuable insights for enhancing the mechanical properties of TMBs, and potentially benefiting the manufacturing of scientific and industrial tools.

通过控制晶粒尺寸来获得最佳的力学性能，包括硬度和断裂韧性，是开发硬质和超硬过渡金属硼化物（TMBs）陶瓷的基本和长期目标。在纳米晶陶瓷中，可望大大提高TMBs的力学性能。然而，由于烧结性能差和高温下晶粒生长明显，致密的纳米级TMBs压实材料的制造面临挑战。本文利用压降活化能效应，在高压中温条件下制备了纳米多晶二硼化钽（NP-TaB2）单体。这些NP-TaB2块体具有致密的微观结构，平均晶粒尺寸可达36 nm，这是由于高压诱导的高形核速率和最小的晶粒生长。随着晶粒尺寸的减小，受Hall-Petch效应的影响，NP-TaB2的硬度达到27.5 GPa，比致密的微米级晶粒试样硬度提高近45%。在纳米尺度下，NP-TaB2的断裂韧性同时提高了70%，这是由于纳米颗粒通过裂纹偏转、分支和桥接有效地耗散能量，从而在提高硬度的同时增强了断裂韧性。这一发现表明，将晶粒尺寸和微观结构与力学性能相关联，为提高TMBs的力学性能提供了有价值的见解，并可能有利于科学和工业工具的制造。

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引用次数: 0

Advances in nano-phases reinforced titanium matrix composites: interfacial engineering and configuration strategy 纳米相增强钛基复合材料的研究进展：界面工程与结构策略

Advanced Powder Materials

Pub Date : 2025-11-07 DOI: 10.1016/j.apmate.2025.100360

Zichao Wei , Yuanfei Han , Jiajing Chen , Shaopeng Li , Jianwen Le , Guangfa Huang , Huaqiang Liu , Yimin Zhuo , Zhonggang Sun , Liang Zhang , Di Zhang , Weijie Lu

Advances in aerospace technology have fueled a substantial demand for titanium matrix composites (TMCs), as promising candidates for structural load-bearing components. Traditional TMCs, however, encounter the persistent trade-off between strength and ductility due to strong stress concentration induced by micron-phases. Substituting micron-phases with nano-phases (e.g., ceramic nano-phases or carbon nanomaterials) has been demonstrated to effectively improve mechanical properties in TMCs. Nevertheless, severe interfacial lattice mismatch between nano-phases and Ti matrix, coupled with the agglomeration behavior caused by inherent van der Waals forces of nano-phases pose notable challenges to attaining maximum strengthening efficiency. Thus, this review systematically summarizes recent advancements in addressing the aforementioned dilemma in nano-phases reinforced TMCs (NRTMCs). It begins with an overview of various nano-phases and fabrication methodologies employed in NRTMCs. Subsequently, the discussion focuses on the multiscale design strategies of NRTMCs, encompassing interfacial engineering in nanoscale, and configuration strategies in microscale, mechanical properties and associated strengthening mechanisms in NRTMCs. Finally, this review provides comprehensive insights into current development trends and future application prospects, outlining the advantages/disadvantages alongside underlying issues of NRTMCs. It serves as a valuable guideline for researchers pursuing the next-generation of high-performance TMCs, highlighting the considerable potential of NRTMCs to revolutionize aerospace and other industries.

航空航天技术的进步推动了对钛基复合材料（tmc）的大量需求，钛基复合材料作为结构承重部件的有前途的候选材料。然而，由于微米相引起的强应力集中，传统的tmc在强度和延性之间存在持续的权衡。用纳米相（如陶瓷纳米相或碳纳米材料）代替微米相已被证明可以有效地改善tmc的力学性能。然而，纳米相与Ti基体之间严重的界面晶格失配，加上纳米相固有的范德华力引起的团聚行为，对获得最大的强化效率构成了显著的挑战。因此，本文系统地总结了纳米相增强TMCs （NRTMCs）在解决上述困境方面的最新进展。它首先概述了nrtmc中采用的各种纳米相和制造方法。随后，重点讨论了nrtmc的多尺度设计策略，包括纳米尺度的界面工程、微尺度的配置策略、nrtmc的力学性能和相关强化机制。最后，本文综述了nrtmc的发展趋势和未来应用前景，概述了nrtmc的优势/劣势以及潜在问题。它为研究人员追求下一代高性能tmc提供了有价值的指导，突出了nrtmc在航空航天和其他工业领域的巨大潜力。

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引用次数: 0

Leveraging structural rigidity for thermal robust scintillation in rare-earth halide perovskites 利用结构刚性实现稀土卤化物钙钛矿的热稳健闪烁

Advanced Powder Materials

Pub Date : 2025-11-07 DOI: 10.1016/j.apmate.2025.100371

Zhi Yang , Jiangtao Cui , Linyuan Gu , Ruizhou Gao , Ting Wang , Jizhong Song

High-temperature scintillators are critical components for X-ray imaging technique used in extreme environments such as oil well-logging, nuclear reactors, and industrial inspections. Cu and Mn-based perovskites have high brightness but suffer from severe thermal quenching. In contrast, rare-earth based perovskites are candidates of high-temperature scintillators. However, their development is hindered by the absence of studying the relationship between structural rigidity and property. Herein, we find that rare-earth-doped 3D Cs₂NaLuCl₆ and 0D Cs₃LuCl₆ perovskites have thermally-stable emission resulting from their high Debye temperature exceeding 200 K and thermally-stable energy transfer efficiency. We also observe that Tb³⁺-green emission and Ce³⁺/Sm³⁺-red emission have brighter X-ray images than Ce³⁺-UV emission due to their camera-matched spectral emissions. The 3D perovskite has low structural rigidity and strong electron−phonon coupling, and the scintillator achieves a high emission intensity and slight thermal quenching. In contrast, the 0D perovskite has higher structural rigidity and weaker electron−phonon coupling, and the scintillator exhibits a lower emission intensity and pronounced anti-thermal-quenching. The findings provide insights into bolstering the structural rigidity of Lu-halide perovskites in achieving thermally-stable luminescence for high-temperature scintillators, and prompting efforts to utilize the emission color of scintillators.

高温闪烁体是极端环境下使用的x射线成像技术的关键部件，如油井测井、核反应堆和工业检查。Cu基和mn基钙钛矿亮度高，但热猝灭严重。相反，稀土基钙钛矿是高温闪烁体的候选材料。然而，由于缺乏对结构刚度与性能关系的研究，它们的发展受到阻碍。本文发现，稀土掺杂的3D Cs2NaLuCl6和0D Cs3LuCl6钙钛矿具有热稳定的发射特性，这是因为它们具有超过200 K的高德拜温度和热稳定的能量传递效率。我们还观察到Tb3+-绿色发射和Ce3+/Sm3+-红色发射的x射线图像比Ce3+-紫外发射更亮，因为它们的光谱发射与相机匹配。三维钙钛矿具有较低的结构刚度和较强的电子-声子耦合，且闪烁体具有较高的发射强度和轻微的热猝灭。相比之下，0D钙钛矿具有较高的结构刚度和较弱的电子-声子耦合，闪烁体具有较低的发射强度和明显的抗热猝灭性。这些发现为提高卤化物钙钛矿的结构刚度，实现高温闪烁体的热稳定发光提供了新的见解，并促使人们努力利用闪烁体的发射颜色。

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引用次数: 0

Emerging of carbon quantum dots-based powder materials for photocatalytic environmental remediation and chemical production 用于光催化环境修复和化工生产的碳量子点粉末材料的出现

Advanced Powder Materials

Pub Date : 2025-11-07 DOI: 10.1016/j.apmate.2025.100372

Haitao Ren , Abdelkader Labidi , Zongcheng Miao , Jiangyushan Liang , Xiangbo Feng , Manni Li , Yuzhen Zhao , Chuanyi Wang

The climate crisis and global pollution urgently require cheap and sustainable methods to produce materials and clean ecosystems, such as photocatalysis that uses solar energy. Nonetheless, actual photocatalysts are limited by poor light absorption, low redox ability, high cost, and low efficiency. Here, we review the photocatalysis using carbon quantum dot (CQDs)-based nanomaterials, focusing on their synthesis, co-catalysts, single photocatalysts, and heterostructures through coordination of inorganic and organic semiconductors. They have low preparation cost, ultra-low ecological toxicity, favorable dispersibility, unique optical properties, and photoinduced charge transfer properties. Discovered in 2004, they have been applied in photocatalytic degradation of various organic pollutants, carbon dioxide reduction, hydrogen evolution, photocatalytic sterilization, organic synthesis, and hydrogen peroxide production. We compare the top-down and bottom-up preparation strategies for CQDs, presenting their recent applications in wastewater treatment, sterilization, degradation of gaseous pollutants, and the production of valuable chemicals. Lastly, with the emergence of defective CQDs, these materials appear promising for photocatalytic remediation technologies and the production of useful chemicals.

气候危机和全球污染迫切需要廉价和可持续的方法来生产材料和清洁的生态系统，例如使用太阳能的光催化。然而，实际的光催化剂受到光吸收能力差、氧化还原能力低、成本高、效率低等限制。本文综述了基于碳量子点（CQDs）的纳米材料的光催化研究进展，重点介绍了CQDs的合成、助催化剂、单光催化剂以及无机和有机半导体配合的异质结构。它们具有制备成本低、超低生态毒性、良好的分散性、独特的光学性质和光致电荷转移性质。发现于2004年，已应用于光催化降解各种有机污染物、二氧化碳还原、析氢、光催化杀菌、有机合成、过氧化氢生产等领域。我们比较了自上而下和自下而上的CQDs制备策略，介绍了它们在废水处理、灭菌、气体污染物降解和有价值化学品生产方面的最新应用。最后，随着缺陷CQDs的出现，这些材料在光催化修复技术和生产有用化学品方面表现出了很大的前景。

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引用次数: 0

Multifunctional metal–organic framework-based electrocatalysts: from CO2 reduction and ammonia synthesis to urea production 多功能金属有机骨架电催化剂：从二氧化碳还原和合成氨到尿素生产

Advanced Powder Materials

Pub Date : 2025-11-04 DOI: 10.1016/j.apmate.2025.100370

Hao Liang, Aishan Li, Ning Yuan

The urgent need for sustainable chemical production has spurred interest in electrocatalytic technologies powered by renewable electricity. Among these, electrocatalytic carbon dioxide reduction (ECR), electrocatalytic ammonia synthesis (EAS), and particularly electrocatalytic urea synthesis (EUS) offer promising strategies for green carbon–nitrogen conversion. EUS stands out by co-reducing CO₂ and nitrogen sources (e.g., N₂, NO, NO₂⁻, NO₃⁻) to enable C–N bond formation, presenting unique opportunities for resource efficiency and emissions reduction. However, its practical implementation is limited by insufficient catalytic activity, selectivity, and durability; incomplete understanding of C–N coupling pathways; and competition from side reactions. Metal–organic framework (MOF)-based materials have emerged as versatile platforms for electrocatalysis owing to their tunable metal nodes and ligand chemistry, multifunctional active sites, and hierarchically porous architectures that afford efficient mass transport. Accordingly, MOF-based platforms are poised to lower the intrinsic C–N coupling barrier, coordinate dual-substrate delivery and co-adsorption, suppress parasitic hydrogen evolution reaction (HER), and improve charge transport and durability in EUS. This review categorizes MOF functionalization strategies for active site design and microenvironment modulation. It then evaluates representative advances with MOF-based materials in ECR, EAS, and EUS, with a particular focus on elucidating structure–mechanism–performance correlations. Drawing on insights from ECR and EAS, we propose transferable design principles to guide the rational development of MOF-based systems for efficient EUS. Finally, we highlight persistent challenges and outline future research directions to advance cross-reaction design strategies and accelerate the practical deployment of MOF-based electrocatalysts.

对可持续化工生产的迫切需求激发了人们对可再生电力驱动的电催化技术的兴趣。其中，电催化二氧化碳还原（ECR）、电催化氨合成（EAS），特别是电催化尿素合成（EUS）为绿色碳氮转化提供了很有前景的策略。EUS通过共同还原CO2和氮源（如N2， NO, NO2 -, NO3 -）来形成C-N键，为资源效率和减排提供了独特的机会。然而，它的实际应用受到催化活性、选择性和耐久性不足的限制；对碳氮耦合途径的不完全理解；还有来自副反应的竞争。基于金属有机框架（MOF）的材料由于其可调节的金属节点和配体化学、多功能活性位点以及提供高效质量传输的分层多孔结构而成为电催化的通用平台。因此，基于mof的平台有望降低本征C-N偶联势垒，协调双底物传递和共吸附，抑制寄生析氢反应（HER），提高EUS中的电荷输运和耐久性。本文对活性位点设计和微环境调节的MOF功能化策略进行了分类。然后评估了mof基材料在ECR、EAS和EUS中具有代表性的进展，特别侧重于阐明结构-机制-性能的相关性。根据ECR和EAS的见解，我们提出了可转移的设计原则，以指导基于mof的高效EUS系统的合理开发。最后，我们强调了持续存在的挑战，并概述了未来的研究方向，以推进交叉反应设计策略并加速基于mof的电催化剂的实际应用。

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引用次数: 0

Ultrastrong and ductile hierarchical heterostructured titanium composites from room to high temperatures 从室温到高温的超强和延展性分层异质结构钛复合材料

Advanced Powder Materials

Pub Date : 2025-11-01 DOI: 10.1016/j.apmate.2025.100369

Shaolong Li , Shufeng Li , Huiying Liu , Lei Liu , Shaodi Wang , Dongxu Hui , Jie Yan , Rui zhou , Dingbo Tao , Wenfei Huang , Jianbo Gao , Xiaodong Hou , Xin Zhang , Bo Li , Zhimao Wang , Gang Li , Junhua Luan , Junko Umeda , Katsuyoshi Kondoh , Philip J. Withers , Yuntian Zhu

Titanium matrix composites (TMCs) offer significant enhancements in strength and heat resistance while preserving the low-density characteristic of advanced lightweight titanium alloys. However, ultra-strong, high-temperature TMCs are typically brittle at room temperature. Here, we overcome this limitation reporting a novel hierarchical, heterostructured design that achieving a 9.5% ductility —exceeding that of the TA15 matrix alloy—along with a remarkable tensile strength of nearly 1.4 GPa at room temperature and 700 MPa at 600 °C. This design forms hard, fine-grained regions homogeneously embedded within a soft, coarse-grained matrix. The hierarchical architecture facilitates the emergence of hetero-deformation-induced (HDI) stresses and strain partitioning, thereby enhancing strain hardening and dislocation activity. Our design strategy provides a pathway to achieving not only an optimal combination of strength-ductility at room-temperature but also exceptional high-temperature resistance.

钛基复合材料（tmc）在保持先进轻质钛合金的低密度特性的同时，显著增强了强度和耐热性。然而，超强高温tmc在室温下通常是脆性的。在这里，我们克服了这一限制，报告了一种新的分层异质结构设计，实现了9.5%的延展性，超过了TA15基体合金，同时在室温下具有近1.4 GPa的抗拉强度，在600℃下具有700 MPa的抗拉强度。这种设计形成硬的、细粒度的区域均匀地嵌入在软的、粗粒度的矩阵中。分层结构促进了异质变形诱导（HDI）应力和应变分配的出现，从而增强了应变硬化和位错活性。我们的设计策略提供了一条途径，不仅可以在室温下实现强度-延性的最佳组合，还可以实现卓越的耐高温性能。

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引用次数: 0

Interfacial engineering of CeO2/Bi19Br3S27 heterojunction for efficient photoreduction of CO2 to CO with nearly 100% selectivity CeO2/Bi19Br3S27异质结的界面工程，以近100%的选择性将CO2光还原为CO

Advanced Powder Materials

Pub Date : 2025-10-30 DOI: 10.1016/j.apmate.2025.100368

Nixiang Zhou , Linyi Yuan , Qiran Li , Zhiliang Jin , Haijiao Xie , Senpei Tang , Chuncheng Chen , Youji Li

Artificial photosynthesis, harnessing solar energy to convert CO₂ into hydrocarbons, holds great promise as a solution to climate change and energy scarcity. However, highly efficient CO₂ reduction reactions and selective activity carried out through photocatalysis using solar light remain a significant challenge. To tackle this issue, an interface engineering was employed to design a diatomic connection S-scheme heterojunction CeO₂/Bi₁₉Br₃S₂₇, featuring interface coupling effect. The optimized CeO₂/Bi₁₉Br₃S₂₇-20 achieves CO product unprecedented yield of 65.1 μmol g⁻¹ h⁻¹with high selectivity (almost 100%) and an excellent stability under gas-solid catalysis, solar irradiation and cost-effective conditions without photosensitizer, sacrificial agent, rare element, noble metal cocatalyst, or high-pressure gaseous CO₂. Combined experimental characterization and density functional theory (DFT) calculations elucidate the dual role of the engineered interface: (i) facilitating spatially directed charge separation through the S-scheme mechanism ascribed from the diatomic connection of Bi-O and Ce-S as well as the interface coupling effect, and (ii) lowering the energy barrier for ∗COOH intermediate formation while disfavoring ∗CHO pathways. This interfacial electronic restructuring promotes both CO₂ activation kinetics and thermodynamic selectivity towards CO. This work provides an innovative strategy of interfacial regulation for developing S-scheme heterojunction, simultaneously addressing the critical challenges of activity and selectivity in artificial photosynthesis.

利用太阳能将二氧化碳转化为碳氢化合物的人工光合作用，有望解决气候变化和能源短缺问题。然而，利用太阳能光催化进行高效的CO2还原反应和选择性活性仍然是一个重大挑战。为了解决这一问题，采用界面工程的方法设计了具有界面耦合效应的双原子连接S-scheme异质结CeO2/Bi19Br3S27。优化后的CeO2/Bi19Br3S27-20在不使用光敏剂、牺牲剂、稀有元素、贵金属助催化剂和高压气体CO2的条件下，在气固催化、太阳照射和经济高效的条件下，CO产物收率达到了前所未有的65.1 μmol g−1 h−1，选择性高（几乎100%），稳定性好。结合实验表征和密度泛函数理论（DFT）计算阐明了工程界面的双重作用：(i)通过Bi-O和Ce-S的双原子连接以及界面耦合效应，通过S-scheme机制促进空间定向电荷分离；（ii）降低了∗COOH中间产物形成的能垒，而不利于∗CHO途径。这种界面电子重组促进了CO2对CO的激活动力学和热力学选择性。这项工作为开发s型异质结提供了一种创新的界面调节策略，同时解决了人工光合作用中活性和选择性的关键挑战。

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引用次数: 0

Lattice expansion/contraction triggered by etching-assisted strain engineering of cobalt sulfide heterostructures to boost electromagnetic wave absorption 硫化钴异质结构的蚀刻辅助应变工程引发晶格膨胀/收缩以促进电磁波吸收

Advanced Powder Materials

Pub Date : 2025-10-27 DOI: 10.1016/j.apmate.2025.100367

Zhuolin Liu , Jiaolong Liu , Hui bian , Xuejiao Zhou , Hongsheng Liang , Junkai Ren , Peijun Zhang , Dan Qu , Fengxia Li , Siyu Zhang , Bing Wei , Hongjing Wu

Lattice-level design presents a promising avenue to overcome the bottleneck of achieving a broadband dielectric response in transition metal chalcogenides. However, the selective control of lattice characteristics (expansion or contraction) in multiphase systems remains challenging, and their specific effects on electromagnetic modulation are poorly understood. Herein, we propose an etching-assisted strain engineering strategy to deliberately trigger lattice distortions and regulate lattice expansion and contraction in cobalt sulfide heterostructures. We demonstrate that the sequence of processing steps is critical: an etching-first-sulfurization-later approach (Route 1) preferentially induces tensile strain and lattice expansion, whereas a sulfurization-first-etching-later (Route 2) pathway favors compressive strain and lattice contraction. Compared to the strain-free cobalt sulfide (C-0), the optimal sample (C-24) achieves a comparable coexistence of local lattice expansion and contraction via Route 1. This coexistence expedites localized lattice perturbations, enriches lattice distortion-related sulfur vacancies, and intensifies multiphase heterointerfaces, collectively boosting the dielectric polarization response. Consequently, this elaborate strategy enables an effective absorption bandwidth of 5.45 GHz with excellent polarization behavior, which are 1.83-fold and 1.93-fold improvement over C-0, respectively. This work provides a novel strategy for manipulating polarization response at the lattice level, offering valuable insights for the rational design of advanced heterogeneous absorbents based on lattice strain engineering.

晶格级设计是克服过渡金属硫族化合物实现宽带介电响应瓶颈的一个有前途的途径。然而，多相系统中晶格特性（膨胀或收缩）的选择性控制仍然具有挑战性，并且它们对电磁调制的具体影响知之甚少。在此，我们提出了一种蚀刻辅助应变工程策略，以故意触发硫化钴异质结构中的晶格扭曲和调节晶格膨胀和收缩。我们证明了加工步骤的顺序是至关重要的：蚀刻-先硫化-后方法（路线1）优先诱导拉伸应变和晶格膨胀，而硫化-先蚀刻-后途径（路线2）有利于压缩应变和晶格收缩。与无应变的硫化钴（C-0）相比，最佳样品（C-24）通过路径1实现了类似的局部晶格扩张和收缩共存。这种共存加速了局域晶格扰动，丰富了晶格畸变相关的硫空位，并增强了多相异质界面，共同增强了介电极化响应。因此，这种精心设计的策略使有效吸收带宽达到5.45 GHz，具有良好的极化行为，分别比C-0提高1.83倍和1.93倍。这项工作提供了一种在晶格水平上操纵极化响应的新策略，为基于晶格应变工程的先进非均质吸收材料的合理设计提供了有价值的见解。

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引用次数: 0

Au@MoSx boosted carbon nitride for selective photoreforming of plastic waster: synergistic hydrogen production and value-added chemicals generation Au@MoSx促进氮化碳对塑料废物的选择性光重整：协同制氢和增值化学品的产生

Advanced Powder Materials

Pub Date : 2025-10-26 DOI: 10.1016/j.apmate.2025.100366

Yadan Luo , Danyang Zhang , Jingzhao Cheng , Guijie Liang , Guangmin Ren , Jingsan Xu , Hua Tang , Shaowen Cao

Combining the hydrogen production reaction with the photoreforming of plastic waste represents a key strategy for establishing a circular economy. Herein, the Au@MoS_x nanoparticles were successfully modified onto carbon nitride (CN/Au@MoS_x) and employed for efficient hydrogen production, coupled with the high-selectivity upcycling of plastics into value-added products. Comprehensive characterization and density functional theory (DFT) calculations confirm that Au acts as an electron transfer mediator, accelerating charge migration from CN to MoS_x. This facilitates the separation of photogenerated electron–hole pairs, thereby enhancing H₂ evolution activity while preserving the high oxidation potential of holes on CN, which is favorable for plastic oxidation. Consequently, the optimal photocatalyst showed an H₂ production rate of 1.73 mmol g⁻¹ h⁻¹, which is 10.5 times higher than that of CN (0.13 mmol g⁻¹ h⁻¹). Meanwhile, the liquid product achieves a selectivity of 77.9% for glycolic acid in the production of C₂ compounds, which is 3.0 times higher than that of CN alone. Therefore, this study proposes a solar-driven “waste-to-wealth” approach that converts plastic waste into clean fuels and highly selective valuable chemical products, thereby addressing plastic pollution and fossil fuel dependency.

将制氢反应与塑料废物的光重整相结合是建立循环经济的关键战略。在此，Au@MoSx纳米颗粒被成功修饰到氮化碳（CN/Au@MoSx）上，并用于高效制氢，同时高选择性地将塑料升级为增值产品。综合表征和密度泛函理论（DFT）计算证实，Au作为电子转移介质，加速电荷从CN向MoSx的迁移。这有利于光生电子-空穴对的分离，从而增强了析氢活性，同时保持了CN上空穴的高氧化电位，有利于塑性氧化。结果表明，该光催化剂的产氢速率为1.73 mmol g−1 h−1，是CN （0.13 mmol g−1 h−1）的10.5倍。同时，液相产物对C2化合物乙醇酸的选择性达到77.9%，比单独合成CN的选择性高3.0倍。因此，本研究提出了一种太阳能驱动的“废物转化财富”方法，将塑料废物转化为清洁燃料和高选择性有价值的化学产品，从而解决塑料污染和化石燃料依赖问题。

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引用次数: 0