Rare Metals最新文献_第8页

Portevin–Le Chatelier (PLC) effect induced by different deformation mechanisms in Ni–25Mo–8Cr alloy during high-temperature tensile deformation 高温拉伸变形过程中不同变形机制在 Ni-25Mo-8Cr 合金中诱发的波特文-勒夏特列（PLC）效应

IF 8.8 1区材料科学

Rare Metals Pub Date : 2024-07-27 DOI: 10.1007/s12598-024-02908-1

Ming Yang, Tao Luo, Lei Lei, Yun Jiang, Pan-Zhi Wang, Fa-Hong Xu

{"title":"Portevin–Le Chatelier (PLC) effect induced by different deformation mechanisms in Ni–25Mo–8Cr alloy during high-temperature tensile deformation","authors":"Ming Yang, Tao Luo, Lei Lei, Yun Jiang, Pan-Zhi Wang, Fa-Hong Xu","doi":"10.1007/s12598-024-02908-1","DOIUrl":"https://doi.org/10.1007/s12598-024-02908-1","url":null,"abstract":"Uniaxial tensile testing explored the Portevin–Le Chatelier (PLC) effect in nickel-based superalloys featuring high Mo/Cr mass ratios, focusing on the influence of variations in the initial microstructure on the deformation behavior at room and elevated temperatures. Experimental results indicated that the PLC effect was observed solely in the high-temperature tensile curves. However, the deformation mechanisms and characteristics of the PLC effect varied with different initial microstructures. Solid solution (SS) and over-aged (OA) samples exhibited C-type serrations, while under-aged (UA) and peak-aged (PA) specimens, featuring short- and long-range ordered phases, respectively, exhibited A + B type serrations in their tensile curves. Microstructural evolution from the SS to the UA, PA and OA states changed their stacking fault energy (SFE), leading to a sequential transformation in the plastic deformation mechanisms during high-temperature tensile deformation: stacking fault (SF) → nanotwin → microtwin → SF. C-type serrations in the SS samples were associated with high solute-atom contents and SF formation. The PLC effects in the UA and PA samples were predominantly caused by solute atom pinning dislocations. Although precipitates and twins were not the primary drivers of the PLC effect, they impeded dislocation migration, exacerbated solute-atom segregation and enhanced dislocation pinning, generating A + B-shaped serrations. In the OA specimens, precipitated phases induced interfacial mismatch under thermal-force coupling. SF shearing of the precipitated phase and subsequent re-dissolution facilitated the formation of C-type serrations, whose PLC effect was induced by the combined action of dynamic strain aging (DSA), SFs of the matrix and diffusion-controlled pseudo-locking mechanisms.<h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"69 5 1","pages":""},"PeriodicalIF":8.8,"publicationDate":"2024-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141773774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Coercivity enhancement of nanocrystalline Ce-based magnets utilizing simplified one-step hot deformation process 利用简化的一步热变形工艺提高纳米晶 Ce 基磁体的矫顽力

IF 8.8 1区材料科学

Rare Metals Pub Date : 2024-07-27 DOI: 10.1007/s12598-024-02907-2

Xue-Feng Liao, Qing Zhou, Wei-Wei Zeng, Bang Zhou, Hong-Ya Yu, Wei-Da Huang, Wen-Bing Fan, Jia-Sheng Zhang, Zhong-Wu Liu

{"title":"Coercivity enhancement of nanocrystalline Ce-based magnets utilizing simplified one-step hot deformation process","authors":"Xue-Feng Liao, Qing Zhou, Wei-Wei Zeng, Bang Zhou, Hong-Ya Yu, Wei-Da Huang, Wen-Bing Fan, Jia-Sheng Zhang, Zhong-Wu Liu","doi":"10.1007/s12598-024-02907-2","DOIUrl":"https://doi.org/10.1007/s12598-024-02907-2","url":null,"abstract":"Nanocrystalline Ce-based rare earth (RE)–Fe–B alloys exhibit relatively good hard magnetic properties and high performance–cost ratio, but their properties deteriorate seriously after hot deformation (HD). Here, we present a simplified one-step HD process for preparing anisotropic Ce-based Ce25.88La2.85Y4.56Fe65.73B0.98 (wt%) magnets. The precursor of nanocrystalline powders is first compacted inside a copper tube, and then the powders with the tube are deformed together to achieve magnetic anisotropy. Compared with the conventional two-step HD magnet, i.e., hot pressing followed by HD, one-step HD significantly increased the coercivity from 1.6 to 3.0 kOe, and the maximum magnetic energy product was improved from 3.7 to 4.8 MGOe. The microstructure characterization indicates that one-step HD can not only produce a more desirable microstructure, characterized by well-aligned platelet-shaped grains with reduced aspect ratio but also greatly inhibit the formation of coarse grain (CG) region. Both of them have been confirmed to be beneficial to enhancing coercivity by micromagnetic simulations. Our results thus demonstrate that the simplified one-step HD process offers a promising approach to developing high-performance anisotropic Ce-based magnets.<h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"26 1","pages":""},"PeriodicalIF":8.8,"publicationDate":"2024-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141773776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fluorinated N,P co-doped biomass carbon with high-rate performance as cathode material for lithium/fluorinated carbon battery 作为锂/氟碳电池正极材料的具有高倍率性能的氟化 N、P 共掺生物质碳

IF 8.8 1区材料科学

Rare Metals Pub Date : 2024-07-27 DOI: 10.1007/s12598-024-02894-4

Ke Yan, Yan Zou, Liang-Xue Bao, Qi Xia, Ling-Yi Meng, Hai-Chen Lin, Hui-Xin Chen, Hong-Jun Yue

{"title":"Fluorinated N,P co-doped biomass carbon with high-rate performance as cathode material for lithium/fluorinated carbon battery","authors":"Ke Yan, Yan Zou, Liang-Xue Bao, Qi Xia, Ling-Yi Meng, Hai-Chen Lin, Hui-Xin Chen, Hong-Jun Yue","doi":"10.1007/s12598-024-02894-4","DOIUrl":"https://doi.org/10.1007/s12598-024-02894-4","url":null,"abstract":"Lithium/fluorinated carbon (Li/CFx) batteries are greatly limited in their applications mostly due to poor rate performances. In this study, N,P co-doped biomass carbon was synthesized using melamine and phytic acid as doping sources, and the resulting product was then utilized as a precursor for CFx. The resulting fluorinated biomass carbon has a high degree of fluorination, exceeding the specific capacity of commercial fluorinated graphite while also demonstrating exceptional performance at high discharge rates. During the fluorination process, N,P-containing functional groups were removed from the crystalline lattice in the basal plane. This facilitates the formation of a defect-rich carbon matrix, enhancing the F/C ratio by improving the fluorinated active sites and obtaining more highly active semi-ionic bonds. Additionally, the abundant defects and porous structure promote Li+ diffusion. Density functional theory calculations indicated that doping modification effectively reduces the energy barrier for Li+ migration, enhancing Li+ transport efficiency. The prepared CFx delivers material with a maximum specific capacity of 919 mAh·g−1, while maintaining a specific capacity of 702 mAh·g−1 at a high discharge current density of 20C (with a capacity retention rate of 76.4%). In this study, fluorinated N,P co-doped biomass carbon, exhibiting ultrahigh capacity and high-rate performance, was prepared for the first time, which can potentially advance the commercialization of CFx.<h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"43 1","pages":""},"PeriodicalIF":8.8,"publicationDate":"2024-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141773836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Magnetic properties and microstructures of multi-component Sm–Co-based films prepared by high-throughput experiments 通过高通量实验制备的多组分 Sm-Co 基薄膜的磁性能和微观结构

IF 8.8 1区材料科学

Rare Metals Pub Date : 2024-07-27 DOI: 10.1007/s12598-024-02902-7

Xin-Rui Zheng, Si-Zhe Liang, Zhao-Guo Qiu, Yan-Song Gong, Hong-Xia Meng, Gang Wang, Zhi-Gang Zheng, Wei-Xing Xia, De-Chang Zeng, Ping Liu

{"title":"Magnetic properties and microstructures of multi-component Sm–Co-based films prepared by high-throughput experiments","authors":"Xin-Rui Zheng, Si-Zhe Liang, Zhao-Guo Qiu, Yan-Song Gong, Hong-Xia Meng, Gang Wang, Zhi-Gang Zheng, Wei-Xing Xia, De-Chang Zeng, Ping Liu","doi":"10.1007/s12598-024-02902-7","DOIUrl":"https://doi.org/10.1007/s12598-024-02902-7","url":null,"abstract":"Sm–Co-based films play an irreplaceable role in special applications due to their high curie temperature and magnetocrystalline anisotropic energy, especially in heat-assisted magnetic recording (HAMR), but the complex composition of Sm–Co phase and unclear synergistic coupling mechanisms of multi-elemental doping become the challenges to enhance the properties. In this work, a novel strategy combining magnetron sputtering and a high-throughput experiment method is applied to solve the above-mentioned problems. Fe/Cu co-doping highly increases the remanence while maintaining a coercivity larger than 26 kOe, leading to an enhancement of the magnetic energy product to 18.1 MGOe. X-ray diffraction (XRD) and high-resolution transmission electron microscope (HRTEM) reveals that SmCo5 phase occupies the major fraction, with Co atoms partially substituted by Fe and Cu atoms. In situ Lorentz transmission electron microscopy (LTEM) observations show that the Sm (Co, Cu)5 phase effectively prohibits domain wall motions, leading to an increase of coercivity (Hc). Fe doping increases the low saturation magnetization (Ms) and low remanence (Mr) due to the Fe atom having a higher saturation magnetic moment. The magnetization reversal behaviors are further verified by micromagnetic simulations. Our results suggest that Sm–Co-based films prepared via Fe/Cu co-doping could be a promising candidate for high-performed HAMR in the future.<h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"69 1","pages":""},"PeriodicalIF":8.8,"publicationDate":"2024-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141773775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

WSe2/MoSe2 with a better-matched heterointerface dominating high-performance potassium/sodium storage 具有更佳匹配异质表面的 WSe2/MoSe2 在高性能钾/钠存储中占据主导地位

IF 8.8 1区材料科学

Rare Metals Pub Date : 2024-07-24 DOI: 10.1007/s12598-024-02906-3

Zhi-Yuan Song, Yun-Dong Cao, Lin-Lin Fan, Jian Song, Yi Feng, Hong Liu, Cai-Li Lv, Guang-Gang Gao

{"title":"WSe2/MoSe2 with a better-matched heterointerface dominating high-performance potassium/sodium storage","authors":"Zhi-Yuan Song, Yun-Dong Cao, Lin-Lin Fan, Jian Song, Yi Feng, Hong Liu, Cai-Li Lv, Guang-Gang Gao","doi":"10.1007/s12598-024-02906-3","DOIUrl":"https://doi.org/10.1007/s12598-024-02906-3","url":null,"abstract":"Constructing a valid heterointerface with a built-in electric field is an effective strategy for designing energy storage anodes with exceptional efficiency for potassium-ion batteries (PIBs) and sodium-ion batteries (SIBs). In this study, WSe2/MoSe2 nanosheets with a better-matched and stable heterojunction interface were uniformly embedded in carbon nanofiber frameworks (WSe2/MoSe2/CNFs). The ion/electron transfer kinetics were facilitated by heterointerfaces with an enlarged effective utilization range. Meanwhile, the heterointerface directed electron transfer from MoSe2 to WSe2 and had significant potassium adsorption capability. The ultra-high pseudocapacitance contribution originating from the heterostructure and morphological features of the WSe2/MoSe2 nanosheets contributed to enhancing high-rate energy storage. Moreover, in situ X-ray diffraction and ex situ X-ray photoelectron spectroscopy revealed the potassification/depotassification behavior of the WSe2/MoSe2/CNFs during the conversion reaction. Consequently, after 500 cycles at 5 A·g−1, the WSe2/MoSe2/CNF anode demonstrated an outstanding long-term cycling performance of 125.6 mAh·g−1 for PIBs. While serving as a SIB electrode, it exhibited an exceptional rate capability of 243.5 mAh·g−1 at 20 A·g−1. With the goal of developing high-performance PIB/SIB electrode materials, the proposed strategy, based on heterointerface adaptation engineering, is promising.<h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"214 1","pages":""},"PeriodicalIF":8.8,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141773777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High strength-ductility synergy in refractory multi-principal element alloys via special deformation mechanisms and dislocation behaviors 通过特殊变形机制和位错行为实现难熔多主元素合金的高强度-韧性协同效应

IF 8.8 1区材料科学

Rare Metals Pub Date : 2024-07-24 DOI: 10.1007/s12598-024-02899-z

Zhi-Wen Li, Bao-Xian Su, Liang Wang, Chen Liu, Zhe Li, Qing-Da Zhang, Bin-Bin Wang, Xiang Xue, Rui-Run Chen, Yan-Qing Su

{"title":"High strength-ductility synergy in refractory multi-principal element alloys via special deformation mechanisms and dislocation behaviors","authors":"Zhi-Wen Li, Bao-Xian Su, Liang Wang, Chen Liu, Zhe Li, Qing-Da Zhang, Bin-Bin Wang, Xiang Xue, Rui-Run Chen, Yan-Qing Su","doi":"10.1007/s12598-024-02899-z","DOIUrl":"https://doi.org/10.1007/s12598-024-02899-z","url":null,"abstract":"Ti-Zr–Nb refractory multi-principal element alloys (RMPEAs) have attracted increased attention due to their excellent mechanical properties. In this study, (TiZr)80-xNb20Mox (x = 0, 5 and 10) alloys were designed, and the intrinsic conflicts between strength and ductility were overcome via composition optimization and recrystallization. The causes of the superior strength-ductility synergy were investigated in terms of their deformation mechanism and dislocation behavior. The results show that the strength improvement can be attributed to the deformation mechanism transition caused by local chemical fluctuations and lattice distortion. Specifically, the slip band widths decrease after Mo addition, and the measured slip traces in the fracture samples are associated with high-order {112} and {123} slip planes. Furthermore, the grain refinement achieved via recrystallization promotes multi-slip system activation and shortens the slip-band spacing, which reduces the stress concentration and inhibits crack source formation, thereby allowing the alloy to ensure sufficient ductility. Consequently, the Ti35Zr35Nb20Mo10 alloy annealed at 900 °C exhibits high yield strength and elongation. These findings provide a new strategy for designing high-strength RMPEAs and addressing room-temperature brittleness.<h3 data-test=\"abstract-sub-heading\">Graphical Abstract</h3>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"67 1","pages":""},"PeriodicalIF":8.8,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141773835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Three-dimensional carbon microclusters organized by hollow carbon nanospheres for stable Li metal anodes: enabling high packing density and low tortuosity via self-assembly 用于稳定锂金属阳极的中空碳纳米球组织的三维碳微簇：通过自组装实现高堆积密度和低扭曲度

IF 8.8 1区材料科学

Rare Metals Pub Date : 2024-07-23 DOI: 10.1007/s12598-024-02931-2

Du Yeol Jo, Jae Bong Lim, Jin Koo Kim, Yun Chan Kang, Seung-Keun Park

{"title":"Three-dimensional carbon microclusters organized by hollow carbon nanospheres for stable Li metal anodes: enabling high packing density and low tortuosity via self-assembly","authors":"Du Yeol Jo, Jae Bong Lim, Jin Koo Kim, Yun Chan Kang, Seung-Keun Park","doi":"10.1007/s12598-024-02931-2","DOIUrl":"https://doi.org/10.1007/s12598-024-02931-2","url":null,"abstract":"Recently, hollow carbon nanospheres (HCSs) have garnered significant attention as potential Li metal hosts owing to their unique large voids and ease of fabrication. However, similar to other nanoscale hosts, their practical performance is limited by inhomogeneous agglomeration, increased binder requirements, and high tortuosity within the electrode. To overcome these problems and high tortuosity within the electrode, this study introduces a pomegranate-like carbon microcluster composed of primary HCSs (P-CMs) as a novel Li metal host. This unique nanostructure can be easily prepared using the spray-drying technique, enabling its mass production. Comprehensive analyses with various tools demonstrate that compared with HCS hosts, the P-CM host requires a smaller amount of binder to fabricate a sufficiently robust and even surface electrode. Furthermore, owing to reduced tortuosity, the well-designed P-CM electrode can provide continuous and shortened pathways for electron/ion transport, accelerating the Li-ion transfer kinetics and prohibiting preferential Li plating at the upper region of the electrode. Due to these characteristics, Li metal can be effectively encapsulated in the large inner voids of the primary HCSs constituting the P-CM, thereby enhancing the electrochemical performance of P-CM hosts in Li metal batteries. Specifically, the Coulombic efficiency of the P-CM host can be maintained at 97% over 100 cycles, with a high Li deposition areal capacity of 3 mAh·cm−2 and long cycle life (1000 h, 1 mA·cm−2, and 1.0 mAh·cm−2). Furthermore, a full cell incorporating a LiFePO4 cathode exhibits excellent cycle life.<h3 data-test=\"abstract-sub-heading\">Graphical Abstract</h3>\u0000","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"43 1","pages":""},"PeriodicalIF":8.8,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141785365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nano-lamellar Ti3Al/TiAl alloy prepared via dual-wire-fed electron beam-directed energy deposition: microstructure evolution and nanohardness enhancement 通过双线馈送电子束定向能量沉积制备的纳米层状 Ti3Al/TiAl 合金：微观结构演变和纳米硬度增强

IF 8.8 1区材料科学

Rare Metals Pub Date : 2024-07-22 DOI: 10.1007/s12598-024-02837-z

Qi Lv, Liang Wang, Chen Liu, Ying-Mei Tan, Bao-Xian Su, Bin-Bin Wang, Long-Hui Yao, Hong-Ze Fang, Liang-Shun Luo, Rui-Run Chen, Fei Yang, Yan-Qing Su

{"title":"Nano-lamellar Ti3Al/TiAl alloy prepared via dual-wire-fed electron beam-directed energy deposition: microstructure evolution and nanohardness enhancement","authors":"Qi Lv, Liang Wang, Chen Liu, Ying-Mei Tan, Bao-Xian Su, Bin-Bin Wang, Long-Hui Yao, Hong-Ze Fang, Liang-Shun Luo, Rui-Run Chen, Fei Yang, Yan-Qing Su","doi":"10.1007/s12598-024-02837-z","DOIUrl":"https://doi.org/10.1007/s12598-024-02837-z","url":null,"abstract":"Nano-lamellar Ti3Al/TiAl (α2/γ) alloy with significantly improved nanohardness was prepared using dual-wire-fed electron beam-directed energy deposition (EB-DED) in this study. This investigation focused on the evolution of the colony shape and lamellar thickness of the Ti-43Al lamellar alloy at different heights. Nanoindentation tests were employed to evaluate deformation resistance, and numerical simulations provided deeper insights into the deposition process. The results indicate that the colonies are mostly columnar, except for a few equiaxed colonies at the top. Rapid cooling significantly refines the α2 lamellae, resulting in an average spacing of 218 nm and thickness of 41 nm. Additionally, substantial microstrain and a nonequilibrium Al distribution lead to a significant generation of γ variants, refining the γ lamellae to 57 nm. Abundant γ/γ’ and α2/γ interfaces, along with fine α2 phases, contribute to improved deformation resistance. Consequently, the nano-lamellar TiAl alloy exhibited a notable 32% increase in nanohardness (8.3 GPa) while maintaining a similar modulus (197 GPa) to conventionally prepared alloys. This study holds significant promise for advancing high-performance TiAl alloys through the dual-wire-fed EB-DED process.<h3 data-test=\"abstract-sub-heading\">Graphical Abstract</h3>\u0000","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"42 1","pages":""},"PeriodicalIF":8.8,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Carbon nanofiber catalysts containing high-entropy metal phosphides with low-content Ru for highly efficient hydrogen evolution reaction 含高熵金属磷化物和低含量 Ru 的碳纳米纤维催化剂用于高效氢进化反应

IF 8.8 1区材料科学

Rare Metals Pub Date : 2024-07-22 DOI: 10.1007/s12598-024-02912-5

Peng Wang, Jie Zheng, Xue-Hao Li, Wen-Bo Cui, Jin-Hua Liu, Yong Wan, Jun Zhang, Yusuke Yamauchi, Zhong-Li Wang, Mang Niu, Yun-Ze Long

{"title":"Carbon nanofiber catalysts containing high-entropy metal phosphides with low-content Ru for highly efficient hydrogen evolution reaction","authors":"Peng Wang, Jie Zheng, Xue-Hao Li, Wen-Bo Cui, Jin-Hua Liu, Yong Wan, Jun Zhang, Yusuke Yamauchi, Zhong-Li Wang, Mang Niu, Yun-Ze Long","doi":"10.1007/s12598-024-02912-5","DOIUrl":"https://doi.org/10.1007/s12598-024-02912-5","url":null,"abstract":"High-entropy metal phosphide (HEMP) has considerable potential as an electrocatalyst owing to its beneficial properties, including high-entropy alloy synergy as well as the controllable structure and high conductivity of phosphides. Herein, electrospinning and in situ phosphating were employed to prepare three-dimensional (3D) networks of self-supporting HEMP nanofibers with varying degrees of phosphate content. Comprehensive characterizations via X-ray diffraction and X-ray photoelectron spectroscopy, as well as density functional theory calculations, demonstrate that the introduction of phosphorus (P) atoms to HEMP carbon nanofibers mediates their electronic structure, leads to lattice expansion, which in turn enhances their catalytic performance in the hydrogen evolution reaction (HER). Moreover, the formation of metal–P bonds weakens metal–metal interaction and decreases the free energy of hydrogen adsorption, contributing to the exceptional activity observed in the HEMP catalyst. Electrochemical measurements demonstrate that the HEMP-0.75 catalyst with an ultralow loading of 1.22 wt% ruthenium (Ru) exhibits the highest HER catalytic activity and stability in a 1 M KOH electrolyte, achieving a minimal overpotential of 26 mV at a current density of 10 mA·cm−2 and Tafel slope of 50.9 mV·dec−1.<h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"68 1","pages":""},"PeriodicalIF":8.8,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electronic modulation and dual-defect construction of NiMoP/Ni2P heterointerfaces for sustainable oxygen evolution reaction 用于可持续氧进化反应的 NiMoP/Ni2P 异质界面的电子调制和双缺陷构建

IF 8.8 1区材料科学

Rare Metals Pub Date : 2024-07-22 DOI: 10.1007/s12598-024-02784-9

Qing-Qing Zhang, Yan-Na Xu, De-Rong Duan, Heng-Jun Su, Tao Wang, Xiao-Jun Zeng

{"title":"Electronic modulation and dual-defect construction of NiMoP/Ni2P heterointerfaces for sustainable oxygen evolution reaction","authors":"Qing-Qing Zhang, Yan-Na Xu, De-Rong Duan, Heng-Jun Su, Tao Wang, Xiao-Jun Zeng","doi":"10.1007/s12598-024-02784-9","DOIUrl":"https://doi.org/10.1007/s12598-024-02784-9","url":null,"abstract":"The existence of multiple vacancies leads to significant changes in the local atomic structure, which can regulate the electronic structure of the surface and form unsaturated coordination geometries. However, the current methods employed to generate multiple vacancies in two-dimensional (2D) layered double hydroxide (LDH) materials are still difficult to achieve to some extent and are primarily limited to monolayer LDH structures. Here, we present an improved method to synthesize NiMoP/Ni2P catalysts with a sponge-like porous structure. Firstly, NiO with dual defects was constructed by subjecting NiMo-LDH/Ni to air calcination. Subsequently, we performed phosphorization treatment and introduced multiple Ni vacancies and O vacancies as defect sites to tune the edge and substrate surfaces of LDH. At the same time, the electronic structure was tuned by adding P heteroatoms. The synergistic effect of porous structure, heterogeneous interfaces, vacancies, doping defects, and amorphous states can greatly enhance the electron transfer effect inside the catalysts, which significantly improves the catalytic ability of the oxygen evolution reaction (OER). Therefore, the overpotential for the oxygen evolution reaction of NiMoP/Ni2P heterointerfaces reaches 270 mV at a current density of 10 mA·cm−2 under alkaline conditions, with the catalysts capable of sustaining high current densities even after the durability testing for 35 h.<h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"209 1","pages":""},"PeriodicalIF":8.8,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0