Materials Research Bulletin最新文献_第6页

Cutting-edge applications of oleic acid-modified CdSiO3: Ce3+ phosphors: Artificial intelligence enhanced latent fingerprint detection, anti-counterfeiting and optical thermometry 油酸改性 CdSiO3 的前沿应用：Ce3+ 荧光粉：人工智能增强潜伏指纹检测、防伪和光学测温

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-10-06 DOI: 10.1016/j.materresbull.2024.113129

N. Navya , B.R. Radha Krushana , S.C. Sharma , D. Kavyashree , D. Veera Vanitha , Bikash Kar , V.R. Hemanth Kumar , P. Suvarna , Augustine George , K. Manjunatha , Sheng Yun Wu , H. Nagabhushana

A series of (1–11 mol%) Ce³⁺ doped CdSiO₃ phosphors are synthesized via a solution combustion method, and the sample with the optimal doping concentration underwent surface modification with oleic acid (OA). X-ray diffraction (XRD) analysis confirmed the formation of high-purity, well-crystallized CdSiO₃:Ce³⁺ phosphors. Upon 347 nm UV excitation, the phosphor exhibited intense blue emission at 400 nm, with an optimized Ce³⁺ concentration of 5 mol%, attributed to dipole-dipole interactions. The OA-modified phosphor demonstrated significantly enhanced properties, achieving a color purity (CP) of 97.2% and Internal quantum efficiency (I_QE) of 82.5%. The phosphor also exhibited excellent thermal stability, retaining 93.0% of its emission intensity at 423 K and a thermal quenching temperature exceeding 483 K, with a high activation energy (Eₐ) of 0.384 eV. In practical applications, the OA modified phosphor showed exceptional performance in latent fingerprints (LFPs) detection and anti-counterfeiting (AC) across different substrates, offering high resolution, contrast, and minimal background interference. MATLAB based analysis yielded a matching score of 94.52%, surpassing conventional benchmarks, underscoring the phosphor's potential for advanced fingerprint identification. These results demonstrate that the CdSiO₃:5Ce³⁺ phosphor is a promising candidate for applications in white light-emitting diodes (w-LEDs), optical thermometry, forensic analysis and AC technologies.

通过溶液燃烧法合成了一系列 (1-11 mol%) 掺杂 Ce³⁺ 的 CdSiO₃ 荧光粉，并用油酸 (OA) 对最佳掺杂浓度的样品进行了表面改性。X 射线衍射（XRD）分析证实了高纯度、结晶良好的 CdSiO3:Ce3+ 荧光粉的形成。在 347 nm 紫外线激发下，荧光粉在 400 nm 处发出强烈的蓝色光，优化的 Ce³⁺ 浓度为 5 mol%，这归因于偶极-偶极相互作用。OA 改性荧光粉的性能显著增强，色纯度 (CP) 达到 97.2%，内部量子效率 (IQE) 达到 82.5%。该荧光粉还表现出卓越的热稳定性，在 423 K 和超过 483 K 的热淬火温度下仍能保持 93.0% 的发射强度，活化能（Eₐ）高达 0.384 eV。在实际应用中，OA 修饰荧光粉在不同基底的潜伏指纹（LFP）检测和防伪（AC）方面表现出卓越的性能，具有高分辨率、高对比度和最小背景干扰。基于 MATLAB 的分析得出了 94.52% 的匹配分数，超过了传统的基准，凸显了荧光粉在高级指纹识别方面的潜力。这些结果表明，CdSiO₃:5Ce³⁺荧光粉有望应用于白光发光二极管（w-LED）、光学温度测量、法医分析和交流技术。

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引用次数: 0

Magnetically separable Bi2O2CO3/MIL-101(Fe)/CoFe2O4 nanostructured catalysts for heterogeneous reductive remediation of nitrophenols and organic dyes 磁性可分离 Bi2O2CO3/MIL-101(Fe)/CoFe2O4 纳米结构催化剂用于硝基苯酚和有机染料的异相还原修复

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-10-06 DOI: 10.1016/j.materresbull.2024.113133

Nasrin Rahnama , Saeed Farhadi , Farzaneh Mahmoudi

A new magnetically separable nanocomposite, Bi₂O₂CO₃/MIL-101(Fe)/CoFe₂O₄, was successfully synthesized through a hydrothermal method. The composite was characterized through various analytical techniques. The nanocomposite demonstrated good catalytic efficiency in reducing nitroaromatic compounds and organic dyes by using NaBH₄ reducing agent in aqueous solutions at room temperature. The apparent rate constant (k_app) values for 4-nitrophenol, 2-nitrophenol, 2-nitroaniline, and 4-nitroaniline were recorded at 0.457, 0.253, 1.52, and 0.564 min⁻¹, respectively, achieving complete conversion in just 2 to 9 min. Under similar conditions, methylene blue, methyl orange, rhodamine B, congo red, and crystal violet organic dyes were reduced to 98–100 % within 4 to 20 min, with k_app values ranging from 0.157 to 0.885 min⁻¹. Furthermore, the influence of catalyst dosage, NaBH₄ concentration, and substrate concentration on the reduction process was examined. Importantly, the nanocomposite can be recovered using an external magnet and reused over four consecutive cycles without a significant reduction in catalytic efficiency.

通过水热法成功合成了一种新型磁分离纳米复合材料--Bi2O2CO3/MIL-101(Fe)/CoFe2O4。通过各种分析技术对该复合材料进行了表征。使用 NaBH4 还原剂在室温水溶液中还原硝基芳香族化合物和有机染料时，该纳米复合材料表现出良好的催化效率。4-硝基苯酚、2-硝基苯酚、2-硝基苯胺和 4-硝基苯胺的表观速率常数（kapp）分别为 0.457、0.253、1.52 和 0.564 min-¹，仅需 2 至 9 分钟即可实现完全转化。在类似条件下，亚甲基蓝、甲基橙、罗丹明 B、刚果红和结晶紫有机染料在 4 至 20 分钟内被还原到 98-100 %，kapp 值在 0.157 至 0.885 min-¹ 之间。此外，还考察了催化剂用量、NaBH4 浓度和底物浓度对还原过程的影响。重要的是，该纳米复合材料可使用外部磁铁回收，并可连续重复使用四个周期，而催化效率不会显著降低。

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引用次数: 0

Coral-like Co-doped ZnO nanostructures for enhanced triethylamine detection 用于增强三乙胺检测的珊瑚状 Co 掺杂氧化锌纳米结构

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-10-06 DOI: 10.1016/j.materresbull.2024.113131

Xingtai Chen , Tao Liu , Xi-Tao Yin , Jingkun Yu

In this work, coral-like Co-doped ZnO nanostructures were obtained using simple precipitation and hydrothermal methods. Co-doping reduced the composite particle size to 20 nm, and the controlled growth direction formed a larger adsorption area. The gas sensor results suggest that the maximum response to triethylamine at 200 °C was achieved at 5 mol% doping content. The sensor also performed well for the 30-day stability test, displaying excellent selectivity and repeatability. Besides, 5CZO showed a response-recovery time of 52/70 s and a good response to different gas concentrations. The doping mechanism for the improved gas sensing performance with triethylamine was thoroughly investigated.

本研究采用简单的沉淀法和水热法获得了珊瑚状 Co 掺杂氧化锌纳米结构。钴掺杂使复合粒径减小到 20 nm，可控的生长方向形成了更大的吸附面积。气体传感器的研究结果表明，当掺杂量为 5 摩尔%时，在 200 °C 温度下对三乙胺的响应达到最大。该传感器在 30 天的稳定性测试中也表现良好，显示出卓越的选择性和可重复性。此外，5CZO 的响应-恢复时间为 52/70 秒，对不同浓度的气体都有良好的响应。对三乙胺掺杂提高气体传感性能的机理进行了深入研究。

引用次数: 0

Improved photocatalytic activation of PMS using Co-doped g-C3N4 composites for effective degradation of tetracycline: Catalyst performance, photogenerated carrier transfer and degradation mechanism 利用掺 Co 的 g-C3N4 复合材料改进 PMS 的光催化活化，有效降解四环素：催化剂性能、光生载流子转移和降解机制

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-10-06 DOI: 10.1016/j.materresbull.2024.113132

Zhao Mu , Hao Chen , Xiao Feng , Tengfeng Xie , Dejun Wang , Yanhong Lin

Photocatalytic coupled SO₄^•- based advanced oxidation processes (SR-AOPs) are considered as an advanced wastewater treatment technology for degrading pollutants. In this work, Co-doped g-C₃N₄ (CCN) photocatalysts were successfully designed for activation of permonosulfate (PMS) under visible light to efficiently degrade tetracycline (TC). The CCN photocatalyst exhibited enhanced degradation efficiency, removing 95.9 % of TC within 20 min, with a much higher degradation rate constant (0.1354 min^-1) than that of the photocatalytic system (0.0090 min^-1) and the SR-AOPs system (0.0538 min^-1). The separation and transport properties of photogenerated carriers were probed with the assistance of measurements including surface photovoltage and photoluminescence. The results showed that the introduction of Co promoted the effective separation of photogenerated charges in CCN, which accelerated the Co^3+/2+ cycle and realized the efficient activation of PMS. Overall, this study provides a new strategy for the development of efficient photocatalytic activation of PMS for rapid degradation of organic pollutants.

基于二氧化硫的光催化耦合高级氧化工艺（SR-AOPs）被认为是一种降解污染物的先进废水处理技术。在这项工作中，成功设计了掺钴 g-C3N4 (CCN) 光催化剂，用于在可见光下活化过硫酸盐 (PMS)，从而高效降解四环素 (TC)。CCN 光催化剂表现出更高的降解效率，在 20 分钟内可去除 95.9% 的四环素，其降解速率常数（0.1354 min-1）远高于光催化系统（0.0090 min-1）和 SR-AOPs 系统（0.0538 min-1）。在表面光电压和光致发光等测量手段的帮助下，对光生载流子的分离和传输特性进行了探测。结果表明，Co 的引入促进了 CCN 中光生电荷的有效分离，加速了 Co3+/2+ 循环，实现了 PMS 的高效活化。总之，该研究为开发高效光催化活化 PMS 快速降解有机污染物提供了一种新策略。

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引用次数: 0

Dielectric properties of low-temperature co-fired capacitor ceramics and MLCC devices with Ag inner electrodes 低温共烧电容器陶瓷和含银内电极的 MLCC 器件的介电性能

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-10-05 DOI: 10.1016/j.materresbull.2024.113130

Yuhui Wan, Jiachen Song, Fulin Cao, Fuxue Yan, Han Zhao, Xu Lu, Shu Yang, Yonggui Shi, Pengrong Ren

Low-temperature sintered 0.99((1−x)Bi_0.5Na_0.5TiO₃-xNaNbO₃)-0.01Sr_0.8Na_0.4Nb₂O₆ (100xNN, x = 0.25 and 0.30) ceramics and MLCC were successfully prepared, and the dielectric properties were systematically investigated. The dielectric permittivity at 25 °C (ε′₂₅ °_C) of 25NN ceramic is 1088, and the dielectric variation is small between −88 °C and 400 °C (|△ε′/ε′₂₅ °_C| ≤ 15%, △ε′=ε′-ε′₂₅ °_C). The dielectric loss tangent (tanδ) of 25NN ceramic is less than 0.02 between -65 °C and 358 °C. The MLCC with 25NN ceramic dielectrics and Ag inner electrode also has excellent dielectric stability, of which |△ε′/ε′₂₅ °_C| is less than 15 % between −100 °C and 400 °C, and the dielectric loss is less than 0.02 between −88 °C and 373 °C. All these results indicate that the low-temperature sintered MLCC with Ag inner electrodes is a promising capacitor in automobile engines and aerospace fields, where the usage temperature is often above 300 °C.

成功制备了低温烧结 0.99((1-x)Bi0.5Na0.5TiO3-xNaNbO3)-0.01Sr0.8Na0.4Nb2O6 (100xNN, x = 0.25 和 0.30) 陶瓷和 MLCC，并系统研究了其介电性能。25NN 陶瓷在 25 °C 时的介电常数（ε′25 °C）为 1088，在 -88 °C 至 400 °C 之间介电变化很小（△ε′/ε′25 °C|≤15%，△ε′=ε′-ε′25 °C）。25NN 陶瓷的介电损耗正切（tanδ）在 -65 °C 至 358 °C 之间小于 0.02。使用 25NN 陶瓷电介质和 Ag 内电极的 MLCC 也具有极佳的介电稳定性，其中|△ε′/ε′25 °C| 在 -100 °C 至 400 °C 之间小于 15%，介电损耗在 -88 °C 至 373 °C 之间小于 0.02。所有这些结果表明，内电极为银的低温烧结 MLCC 在使用温度通常高于 300 ℃ 的汽车发动机和航空航天领域是一种很有前途的电容器。

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引用次数: 0

Selective area epitaxy of gallium phosphide-based nanostructures on microsphere lithography-patterned Si wafers for visible light optoelectronics 在微球光刻法刻画的硅晶片上选择性区域外延磷化镓基纳米结构，用于可见光光电技术

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-10-05 DOI: 10.1016/j.materresbull.2024.113126

Liliia N. Dvoretckaia , Vladimir V. Fedorov , Alexander Pavlov , Sergey D. Komarov , Eduard I. Moiseev , Dmitry V. Miniv , Andrey K. Kaveev , Aliaksandr G. Smirnov , Demid A. Kirilenko , Alexey M. Mozharov , Ivan S. Mukhin

In this study, we present the selective area plasma-assisted molecular beam epitaxial growth of GaP-based nanoheterostructures (nanostubs), incorporating direct bandgap GaAsP or GaPN segments, on patterned SiO₂/Si(001) wafers. A microsphere optical lithography and anisotropic Si wet-etching techniques were employed for wafer-scale surface patterning through SiO₂ growth mask, allowing to obtain either planar or pyramidal pit nucleation site morphologies. X-ray diffraction reciprocal space mapping and Raman microspectroscopy studies confirm compositional homogeneity of the nanostub arrays. The dilute nitride nanostubs display the narrowest and most intense visible red photoluminescence response at room temperature, which is an order of magnitude higher compared to the GaAsP ones. The formation of the nitrogen sub-band in GaPN alloy was confirmed in the framework of density functional theory, providing insights for interpreting the experimental results. These findings demonstrate the feasibility of the proposed approach for fabricating the ordered arrays of nanoscale visible light emitters on silicon.

在这项研究中，我们介绍了选择性区域等离子体辅助分子束外延生长基于 GaP 的纳米异质结构（纳米管）的方法，这种纳米异质结构在图案化的二氧化硅/硅（001）晶片上结合了直接带隙 GaAsP 或 GaPN 段。采用微球光学光刻和各向异性硅湿蚀刻技术，通过二氧化硅生长掩模进行晶圆级表面图案化，从而获得平面或金字塔凹坑成核点形态。X 射线衍射倒易空间图谱和拉曼微光谱研究证实了纳米管阵列的成分均匀性。稀氮化物纳米管在室温下显示出最窄、最强烈的可见红色光致发光响应，比砷化镓纳米管高出一个数量级。密度泛函理论框架证实了氮化镓合金中氮子带的形成，为解释实验结果提供了启示。这些发现证明了在硅上制造有序的纳米级可见光发射器阵列的可行性。

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引用次数: 0

A critical review focussing on the synthesis and applications of monoclinic yttrium oxide nanophosphor 关于单斜氧化钇纳米磷的合成和应用的重要综述

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-10-03 DOI: 10.1016/j.materresbull.2024.113128

Soorya G Nath , Anila E I

Research on monoclinic Y₂O₃ has been limited, not because of a lack of potential applications, but rather due to challenges associated with synthesizing phase-pure material. The limited understanding of the material and its properties has hindered researchers from further exploring this compound. Some studies suggest that the B-type polymorph of Y₂O₃ exhibits superior performance compared to its cubic counterpart. Additionally, there are reports indicating the existence of simple synthesis techniques that could potentially overcome the material's significant disadvantage highlighted by many researchers, namely, complex synthesis routes. To date, no comprehensive reports have summarized the key findings related to B-type Y₂O₃. In this effort, we aim to provide an exhaustive overview of research conducted on this polymorph. This includes an examination of diverse synthesis techniques employed by researchers, theoretical studies conducted on the material, an exploration of its luminescence properties, and an overview of various applications studied thus far.

对单斜Y2O3的研究一直很有限，这并不是因为缺乏潜在的应用，而是因为合成相纯材料所面临的挑战。对这种材料及其特性的有限了解阻碍了研究人员进一步探索这种化合物。一些研究表明，Y2O3 的 B 型多晶体比其立方体具有更优越的性能。此外，也有报告指出存在简单的合成技术，有可能克服许多研究人员强调的该材料的主要缺点，即复杂的合成路线。迄今为止，还没有任何全面的报告总结了与 B 型 Y2O3 有关的重要发现。在这项工作中，我们的目标是提供有关这种多晶体研究的详尽概述。其中包括研究人员采用的各种合成技术、对该材料进行的理论研究、对其发光特性的探讨以及对迄今为止研究的各种应用的概述。

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引用次数: 0

Photoelectrocatalytic degradation of organic contaminants by spray coated Z-scheme TiO2/Bi2WO6 heterostructure electrode under solar light 喷涂 Z 型 TiO2/Bi2WO6 异质结构电极在太阳光下光电催化降解有机污染物

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-10-02 DOI: 10.1016/j.materresbull.2024.113127

R.S. Pedanekar , S.V. Mohite , N.A. Narewadikar , S.B. Madake , Y. Kim , S.J. Kim , S.M. Jokare , K.Y. Rajpure

This study demonstrates that spray deposited layered TiO₂/Bi₂WO₆ heterostructure photoelectrodes exhibit strong interfacial interactions, leading to significant enhancements in photoelectrochemical performance. Time-resolved photoluminescence (TRPL) spectra indicated a prolonged lifetime of photoinduced carriers. The red shift in the absorption edge of TiO₂/Bi₂WO₆ improved the visible light harvesting capability of Bi₂WO₆. Nyquist plots showed effective charge separation, and the TiO₂ layer at the bottom significantly influenced the flat band potential compared to pristine Bi₂WO₆, as evidenced by Mott-Schottky analysis. This configuration improved the separation of photogenerated charge carriers via a Z-scheme charge transfer mechanism. The TiO₂/Bi₂WO₆ electrode demonstrated a higher efficiency of 94% for methylene blue degradation within 160 min, compared to pure Bi₂WO₆. Quenching experiments confirmed the Z-scheme charge transfer mechanism in the coupled TiO₂/Bi₂WO₆ heterojunction during degradation reactions. This study highlights the benefits of semiconductor coupling with different band potentials, promoting large-scale applications of solar-driven TiO₂/Bi₂WO₆ photoelectrodes for environmental remediation.

这项研究表明，喷涂沉积的层状 TiO2/Bi2WO6 异质结构光电极表现出很强的界面相互作用，从而显著提高了光电化学性能。时间分辨光致发光（TRPL）光谱显示，光诱导载流子的寿命延长。TiO2/Bi2WO6 吸收边的红移提高了 Bi2WO6 的可见光收集能力。奈奎斯特图显示了有效的电荷分离，与原始 Bi2WO6 相比，底部的 TiO2 层显著影响了平带电位，Mott-Schottky 分析证明了这一点。这种结构通过 Z 型电荷转移机制改善了光生电荷载流子的分离。与纯 Bi2WO6 相比，TiO2/Bi2WO6 电极在 160 分钟内降解亚甲基蓝的效率高达 94%。淬火实验证实了耦合 TiO2/Bi2WO6 异质结在降解反应过程中的 Z 型电荷转移机制。这项研究强调了不同带电位半导体耦合的益处，促进了太阳能驱动的 TiO2/Bi2WO6 光电电极在环境修复领域的大规模应用。

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引用次数: 0

Optimized and nonTi-site doped synthesis of lithium titanate by mechanochemical method 用机械化学法优化合成非钛位掺杂钛酸锂

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-10-01 DOI: 10.1016/j.materresbull.2024.113124

Daoyong Lin , Zhifu Liu , Da Li , Jinjun Zhao , Yue Liu , Lei Cao , Guanxiang Ma , Wei Zhao

The Li₂CO₃-ammonia-ballmilling synthesis system of Li₄Ti₅O₁₂ (LTO) was optimized and doped Li and O by theirs adjacent elements Mg and F respectively. By adjusting the ballmilling parameter, the distribution of Li and Ti sources, the hydrolysis rate and different nucleophilic / electrophilic hydrolysis path of Ti, and the interaction between Li and Ti species can be effectively controlled. The temperature programmed calcination is beneficial to the formation of the middle state (Li₂TiO₃), obtaining the high quality LTO. Mg and F doping can further optimize the hydrolysis and condensation degree of Ti source, the number of crystal nucleus and the particle size. Therefore, the initial first discharged capability of Mg doped LTO and F doped LTO reach to 152.4 mAh/g and 163.1 mAh/g at 5 C respectively, corresponding 32.4 % and 41.7 % enhancing compared to LTO (115.1 mAh/g). Moreover, the discharge voltage of LTO-Mg decreases from 1.5 V to 1.3 V.

对Li4Ti5O12（LTO）的Li2CO3-氨研磨合成体系进行了优化，并分别用相邻元素Mg和F掺杂了Li和O。通过调节球磨参数，可以有效控制 Li 和 Ti 的来源分布、Ti 的水解速率和不同的亲核/亲电水解路径，以及 Li 和 Ti 之间的相互作用。温度编程煅烧有利于中间态（Li2TiO3）的形成，从而获得高质量的 LTO。掺杂 Mg 和 F 能进一步优化 Ti 源的水解和缩合程度、晶核数量和粒度。因此，掺杂镁的 LTO 和掺杂氟的 LTO 在 5 C 时的初始首次放电能力分别达到 152.4 mAh/g 和 163.1 mAh/g，与 LTO（115.1 mAh/g）相比分别提高了 32.4% 和 41.7%。此外，LTO-Mg 的放电电压从 1.5 V 降至 1.3 V。

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引用次数: 0

Stability enhancement of molybdenum modified rutile – carbon composite supported platinum electrocatalysts by reductive pretreatment: Surface characteristics and advanced electrocatalytic properties 通过还原预处理提高钼改性金红石-碳复合支撑铂电催化剂的稳定性：表面特性和先进的电催化性能

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-10-01 DOI: 10.1016/j.materresbull.2024.113114

Cristina Silva , Irina Borbáth , Erzsébet Dodony , Dániel Olasz , György Sáfrán , Ágnes Szegedi , Kristóf Zelenka , András Tompos , Zoltán Pászti

Development of strong metal-support interaction (SMSI) and its influence on the catalytic performance of the Pt/Ti_0.8Mo_0.2O₂-C system, a representative of the mixed oxide-carbon composite supported Pt electrocatalyst family, were investigated. Structural, surface chemical and electrochemical properties of the as-prepared Pt/Ti_0.8Mo_0.2O₂-C catalyst and its counterparts reduced in the 150–450 °C temperature range were compared. TEM elemental mapping confirmed the widespread formation of Pt-oxide-C triple junctions in all catalysts. XPS revealed electronic interaction between the Pt particles and the oxide both in the as-prepared and the reduced catalysts, moreover, demonstrated that transport of Mo to the surface of Pt is initiated by reduction in the 150–250 °C range. Electrochemical measurements pointed out the durability of these Pt-bound Mo species, which also enhance the oxygen reduction activity of the catalyst. Based on the results of 10,000-cycle stability tests, reductive pretreatment between 250–350 °C is recommended for enhancing the properties of Pt/Ti_0.8Mo_0.2O₂-C catalysts by SMSI.

研究了强金属-支撑相互作用（SMSI）的发展及其对 Pt/Ti0.8Mo0.2O2-C 体系催化性能的影响，该体系是混合氧化物-碳复合支撑铂电催化剂家族的代表。比较了制备的 Pt/Ti0.8Mo0.2O2-C 催化剂及其在 150-450 °C 温度范围内还原的同类催化剂的结构、表面化学和电化学特性。TEM 元素图谱证实，所有催化剂中都普遍形成了铂-氧化物-铂-氧化物三重结。XPS 显示，在制备的催化剂和还原的催化剂中，铂粒子和氧化物之间都存在电子相互作用，此外，在 150-250 °C 的温度范围内，钼向铂表面的迁移是通过还原开始的。电化学测量结果表明，这些与铂结合的钼物种具有耐久性，同时也提高了催化剂的氧还原活性。根据 10,000 周期稳定性测试的结果，建议在 250-350 °C 之间进行还原预处理，以通过 SMSI 提高 Pt/Ti0.8Mo0.2O2-C 催化剂的性能。

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引用次数: 0