Pub Date : 2024-10-03DOI: 10.1016/j.jallcom.2024.176864
Michael P. Moodispaw, Jiashi Miao, Emre Cinkilic, Alan A. Luo
The application of high Fe-containing secondary aluminum cast alloys for automotive structural components is restricted due to their low ductility resulting from various intermetallic phases in the solidification microstructure. In this paper, the effect of Ce on secondary Al-Si-Mg-Fe cast alloys was studied systematically using thermodynamic modelling and experimentation. Thermal analysis and microstructure results were compared to thermodynamic simulations. Transmission electron microscopy (TEM) was used to verify the presence of MgAl2Si2, Al2CeSi2, AlCeSi, and AlCeSi2 phases depending on Ce content, in addition to π-Al9FeMg3Si5 and δ-Al3FeSi2. It was found that about 0.25-0.5% Ce additions improved the tensile elongation by approximately 40% to above 5%. AlSiMgFe-0.25Ce alloy showed the highest elongation (5.2%) and ultimate tensile strength (234 MPa), due to the reduced π-Al9FeMg3Si5 and Mg2Si phases scavenged by Ce additions. Eutectic Si was only weakly modified by Ce additions up to around 1 wt%, and no significant effect on secondary dendrite arm spacing or primary Fe-bearing intermetallic phases was observed. Higher Ce additions lead to excessive Ce-bearing intermetallic formation which is detrimental to the alloy ductility. The beneficial effect of 0.25-0.5% Ce additions to secondary Al-Si-Mg-Fe cast alloys provides important new understanding to improve these alloys for structural casting applications.
由于凝固微结构中的各种金属间相导致延展性较低，高含铁二次铝铸造合金在汽车结构部件中的应用受到限制。本文利用热力学模型和实验系统地研究了 Ce 对二次铝-硅-镁-铁铸造合金的影响。热分析和微观结构结果与热力学模拟结果进行了比较。透射电子显微镜（TEM）被用来验证 MgAl2Si2、Al2CeSi2、AlCeSi 和 AlCeSi2 相的存在，这取决于 Ce 的含量，此外还有 π-Al9FeMg3Si5 和 δ-Al3FeSi2。研究发现，约 0.25-0.5% 的 Ce 添加量可将拉伸伸长率提高约 40%至 5%以上。AlSiMgFe-0.25Ce 合金显示出最高的伸长率（5.2%）和极限抗拉强度（234 兆帕），这是由于添加 Ce 清除了减少的 π-Al9FeMg3Si5 和 Mg2Si 相。共晶 Si 仅受到 Ce 添加量（最高约 1 wt%）的微弱改变，且未观察到对二级枝晶臂间距或原生含铁金属间相的显著影响。更高的 Ce 添加量会导致形成过多的含 Ce 金属间化合物，从而对合金的延展性造成损害。二次铝-硅-镁-铁铸造合金中添加 0.25-0.5% Ce 的有利影响为改进这些合金的结构铸造应用提供了重要的新认识。
{"title":"The beneficial effect of Ce additions to high Fe-containing secondary Al-Si-Mg cast alloys","authors":"Michael P. Moodispaw, Jiashi Miao, Emre Cinkilic, Alan A. Luo","doi":"10.1016/j.jallcom.2024.176864","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.176864","url":null,"abstract":"The application of high Fe-containing secondary aluminum cast alloys for automotive structural components is restricted due to their low ductility resulting from various intermetallic phases in the solidification microstructure. In this paper, the effect of Ce on secondary Al-Si-Mg-Fe cast alloys was studied systematically using thermodynamic modelling and experimentation. Thermal analysis and microstructure results were compared to thermodynamic simulations. Transmission electron microscopy (TEM) was used to verify the presence of MgAl<sub>2</sub>Si<sub>2</sub>, Al<sub>2</sub>CeSi<sub>2</sub>, AlCeSi, and AlCeSi<sub>2</sub> phases depending on Ce content, in addition to π-Al<sub>9</sub>FeMg<sub>3</sub>Si<sub>5</sub> and δ-Al<sub>3</sub>FeSi<sub>2</sub>. It was found that about 0.25-0.5% Ce additions improved the tensile elongation by approximately 40% to above 5%. AlSiMgFe-0.25Ce alloy showed the highest elongation (5.2%) and ultimate tensile strength (234<!-- --> <!-- -->MPa), due to the reduced π-Al<sub>9</sub>FeMg<sub>3</sub>Si<sub>5</sub> and Mg<sub>2</sub>Si phases scavenged by Ce additions. Eutectic Si was only weakly modified by Ce additions up to around 1<!-- --> <!-- -->wt%, and no significant effect on secondary dendrite arm spacing or primary Fe-bearing intermetallic phases was observed. Higher Ce additions lead to excessive Ce-bearing intermetallic formation which is detrimental to the alloy ductility. The beneficial effect of 0.25-0.5% Ce additions to secondary Al-Si-Mg-Fe cast alloys provides important new understanding to improve these alloys for structural casting applications.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142369991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The field of spintronics is emerging at blistering pace due to its promising room-temperature applications in low-power logic-based devices. In this work, we investigate the suitability of ferromagnetic (FM) La0.7Sr0.3MnO3 (LSMO) thin film/ferroelectric (FE) Pb(Mg0.33Nb0.67)O3-PbTiO3 (PMN-PT) heterostructures for spintronic device applications through characterizing the static and dynamic magnetic properties. Due to the magnetoelastic coupling at the interface, LSMO/PMN-PT(001) is found to exhibit a 4-fold symmetry of magnetic anisotropy, while LSMO/PMN-PT(111) shows isotropic behavior at room temperature. The direction dependent Gilbert damping constant (α) estimated for the LSMO/PMN-PT(001) sample clearly shows that its values are smaller along the magnetically hard axis than along the easy axis, while no significant variation is observed for the LSMO/PMN-PT(111) sample. The electric field induced variation of α also demonstrate that the Gilbert damping is closely related to the magnetic anisotropy. The present results clearly indicate that it will be possible to realize electric field controlled spin dynamics in FM/FEs to develop futuristic spintronic devices.
{"title":"Variation of Gilbert damping constant via interface induced magnetic anisotropy in LSMO/PMN-PT heterostructures","authors":"Avisek Das, , Takamasa Usami, Satya Prakash Pati, Sachio Komori, Tomoyasu Taniyama, Venkataiah Gorige","doi":"10.1016/j.jallcom.2024.176866","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.176866","url":null,"abstract":"The field of spintronics is emerging at blistering pace due to its promising room-temperature applications in low-power logic-based devices. In this work, we investigate the suitability of ferromagnetic (FM) La<sub>0.7</sub>Sr<sub>0.3</sub>MnO<sub>3</sub> (LSMO) thin film/ferroelectric (FE) Pb(Mg<sub>0.33</sub>Nb<sub>0.67</sub>)O<sub>3</sub>-PbTiO<sub>3</sub> (PMN-PT) heterostructures for spintronic device applications through characterizing the static and dynamic magnetic properties. Due to the magnetoelastic coupling at the interface, LSMO/PMN-PT(001) is found to exhibit a 4-fold symmetry of magnetic anisotropy, while LSMO/PMN-PT(111) shows isotropic behavior at room temperature. The direction dependent Gilbert damping constant (<em>α</em>) estimated for the LSMO/PMN-PT(001) sample clearly shows that its values are smaller along the magnetically hard axis than along the easy axis, while no significant variation is observed for the LSMO/PMN-PT(111) sample. The electric field induced variation of <em>α</em> also demonstrate that the Gilbert damping is closely related to the magnetic anisotropy. The present results clearly indicate that it will be possible to realize electric field controlled spin dynamics in FM/FEs to develop futuristic spintronic devices.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142370011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A Co–Ni–Cu multiprincipal element alloy (MPEA) powder was successfully synthesized through coprecipitation. Results of energy dispersive spectroscopy (EDS) and X-ray fluorescence spectroscopy (XRF) revealed nearly equal atomic ratios for Co, Ni, and Cu in the Co–Ni–Cu MPEA powder. Moreover, X-ray diffraction (XRD) confirmed a single-phase face-centered cubic (fcc) structure in the Co–Ni–Cu MPEA powder. To explore the differences in microstructure and mechanical properties, we compared a novel WC–2Co–2Ni–2Cu cemented carbide, utilizing the Co–Ni–Cu MPEA as a binder, with conventional WC–6Co and WC–3Co–3Ni cemented carbides prepared via liquid phase sintering. This comparison was conducted using scanning electron microscopy, XRD, and mechanical properties testing. Observations revealed that the surfaces of WC grains in WC–2Co–2Ni–2Cu and WC–6Co appeared smooth and flat, while those in WC–3Co–3Ni exhibited roughness with numerous terraces. In addition, the average grain size was 0.96, 1.14, and 1.22 μm in WC–2Co–2Ni–2Cu, WC–6Co, and WC–3Co–3Ni, respectively. Notably, the Co–Ni–Cu MPEA inhibited WC grain growth. WC–2Co–2Ni–2Cu (1388 HV30) exhibited hardness similar to that of WC–6Co (1406 HV30) but the highest fracture toughness (9.04 MPa∙m1/2), while WC–3Co–3Ni (1332 HV30) presented the lowest hardness. Bending strength values were recorded at 2406 MPa for WC–2Co–2Ni–2Cu, 2816 MPa for WC–6Co, and 2645 MPa for WC–3Co–3Ni, with WC–6Co exhibiting the highest bending strength. Considering their microstructures, physical properties, and mechanical properties comprehensively, the novel cemented carbides exhibited only slightly reduced bending strength compared to conventional counterparts. Thus, the Co–Ni–Cu MPEA binder demonstrates promising potential as a replacement for the conventional Co metal binder.
{"title":"Microstructures and properties of a novel cemented carbide prepared using a Co–Ni–Cu multiprincipal element alloy as the binder","authors":"Mingfeng Li, Ruike Yu, Tongzhou Deng, Yachao Huang, Fenglian Qiu, Fang Xu, Binjun Liang, Xiaolong Xie, Zhixiang Wang, Zhiqiang Zhong, Guozuan Xu, Liyong Chen, Qiuming Yang, Hao Chen","doi":"10.1016/j.jallcom.2024.176868","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.176868","url":null,"abstract":"A Co–Ni–Cu multiprincipal element alloy (MPEA) powder was successfully synthesized through coprecipitation. Results of energy dispersive spectroscopy (EDS) and X-ray fluorescence spectroscopy (XRF) revealed nearly equal atomic ratios for Co, Ni, and Cu in the Co–Ni–Cu MPEA powder. Moreover, X-ray diffraction (XRD) confirmed a single-phase face-centered cubic (fcc) structure in the Co–Ni–Cu MPEA powder. To explore the differences in microstructure and mechanical properties, we compared a novel WC–2Co–2Ni–2Cu cemented carbide, utilizing the Co–Ni–Cu MPEA as a binder, with conventional WC–6Co and WC–3Co–3Ni cemented carbides prepared via liquid phase sintering. This comparison was conducted using scanning electron microscopy, XRD, and mechanical properties testing. Observations revealed that the surfaces of WC grains in WC–2Co–2Ni–2Cu and WC–6Co appeared smooth and flat, while those in WC–3Co–3Ni exhibited roughness with numerous terraces. In addition, the average grain size was 0.96, 1.14, and 1.22 μm in WC–2Co–2Ni–2Cu, WC–6Co, and WC–3Co–3Ni, respectively. Notably, the Co–Ni–Cu MPEA inhibited WC grain growth. WC–2Co–2Ni–2Cu (1388 HV<sub>30</sub>) exhibited hardness similar to that of WC–6Co (1406 HV<sub>30</sub>) but the highest fracture toughness (9.04<!-- --> <!-- -->MPa∙m<sup>1/2</sup>), while WC–3Co–3Ni (1332 HV<sub>30</sub>) presented the lowest hardness. Bending strength values were recorded at 2406<!-- --> <!-- -->MPa for WC–2Co–2Ni–2Cu, 2816<!-- --> <!-- -->MPa for WC–6Co, and 2645<!-- --> <!-- -->MPa for WC–3Co–3Ni, with WC–6Co exhibiting the highest bending strength. Considering their microstructures, physical properties, and mechanical properties comprehensively, the novel cemented carbides exhibited only slightly reduced bending strength compared to conventional counterparts. Thus, the Co–Ni–Cu MPEA binder demonstrates promising potential as a replacement for the conventional Co metal binder.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142369992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-03DOI: 10.1016/j.jallcom.2024.176869
Li Li, Lei Huang, Junling Wu, Ling Dai, Xiankai Meng, Hongmei Zhang, Pengfei Li, Shu Huang, Jianzhong Zhou
To address the challenges of poor forming quality in the laser additive manufacturing of lightweight alloys, this paper explores an approach that integrates a laser additive manufacturing strategy for lightweight alloys with surface deformation strengthening. The study investigates the combined effects of build direction (BD) and ultrasonic surface rolling (USR) on the microstructure, residual stress, and mechanical properties of 2195 Al-Li alloy processed by laser powder bed fusion (LPBF). The results indicate that changes in BD significantly affect the growth direction of columnar grains (CGs) in the formed specimens and lead to the formation of a gradient microstructure with different characteristics under the influence of USR. When BD is 0°, the post-USR specimen exhibits the most significant deformation strengthening effect, with the high dislocation density reaching depths of up to 720 μm and compressive residual stress amplitudes up to -159 MPa. When BD is 90°, the sample shows excellent tensile performance with an ultimate tensile strength (UTS) of 386 MPa and an elongation (EL) of 8.2%. After USR treatment, the UTS of the sample increases to 438 MPa, but the EL decreases to 5.1%. CGs exhibit varying deformation resistances in different directions, thereby influencing the deformation strengthening effect of USR and altering the crack propagation mechanism during the tensile process.
{"title":"Effect of ultrasonic surface rolling on the microstructure and mechanical properties of 2195 Al-Li alloy fabricated by laser powder bed fusion in various build directions","authors":"Li Li, Lei Huang, Junling Wu, Ling Dai, Xiankai Meng, Hongmei Zhang, Pengfei Li, Shu Huang, Jianzhong Zhou","doi":"10.1016/j.jallcom.2024.176869","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.176869","url":null,"abstract":"To address the challenges of poor forming quality in the laser additive manufacturing of lightweight alloys, this paper explores an approach that integrates a laser additive manufacturing strategy for lightweight alloys with surface deformation strengthening. The study investigates the combined effects of build direction (BD) and ultrasonic surface rolling (USR) on the microstructure, residual stress, and mechanical properties of 2195 Al-Li alloy processed by laser powder bed fusion (LPBF). The results indicate that changes in BD significantly affect the growth direction of columnar grains (CGs) in the formed specimens and lead to the formation of a gradient microstructure with different characteristics under the influence of USR. When BD is 0°, the post-USR specimen exhibits the most significant deformation strengthening effect, with the high dislocation density reaching depths of up to 720 μm and compressive residual stress amplitudes up to -159 MPa. When BD is 90°, the sample shows excellent tensile performance with an ultimate tensile strength (UTS) of 386<!-- --> <!-- -->MPa and an elongation (EL) of 8.2%. After USR treatment, the UTS of the sample increases to 438<!-- --> <!-- -->MPa, but the EL decreases to 5.1%. CGs exhibit varying deformation resistances in different directions, thereby influencing the deformation strengthening effect of USR and altering the crack propagation mechanism during the tensile process.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142369989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
To inhibit the cracking behavior induced by the poor ductility of LMD-ed H13 steel, we have adopted a soft/hard laminated composite strategy to achieve a 17-4PH/H13 heterostructure alloy. Also, the effect of its hard-soft interfacial characteristics on tensile properties and high/room-temperature wear resistance has been studied. The research results show that this laminated alloy mainly comprises two alternately stacked martensite layers with a layer width of 350 µm, including lath martensite (H13) and lath martensite (17-4PH). The lath-like martensite layer possesses a high average microhardness value of over 500 HV, far higher than that of LMD-ed 17-4PH steel. Besides, the laminated alloy shows a high σb (~1721.59 MPa) with a sufficient δ (~5.21%), far higher than that of LMD-ed H13 steel (i.e., σb ~1701.41 MPa and δ ~ 1.27%), which the fracture mode is mixed by ductile and cleavage fracture. The H13/17-4PH laminated alloy has excellent wear resistance at RT comparable to the LMD-ed H13 steel. Interestingly, the H13/17-4PH laminated alloy maintains low friction coefficients and wear rates at 600 ℃. Specifically, its high-temperature wear rate (22.28×10-6 mm3 N-1·m-1) is one-eighth as low as that of LMD-ed H13 steel (157.17×10-6 mm3 N-1·m-1). The above results provide a reference for re-manufacturing die steels in industrial applications of high-temperature wear resistance.
{"title":"Laser melting deposited a laminated H13/17-4PH heterostructure alloy to achieve strength-ductility synergy and outstanding high-temperature wear resistance","authors":"Hangtao Gao, Jiawang Wu, Yaxiong Guo, Fangping Wang, Tianhai Liao, Jing Zhang, Qibin Liu","doi":"10.1016/j.jallcom.2024.176861","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.176861","url":null,"abstract":"To inhibit the cracking behavior induced by the poor ductility of LMD-ed H13 steel, we have adopted a soft/hard laminated composite strategy to achieve a 17-4PH/H13 heterostructure alloy. Also, the effect of its hard-soft interfacial characteristics on tensile properties and high/room-temperature wear resistance has been studied. The research results show that this laminated alloy mainly comprises two alternately stacked martensite layers with a layer width of 350<!-- --> <!-- -->µm, including lath martensite (H13) and lath martensite (17-4PH). The lath-like martensite layer possesses a high average microhardness value of over 500 HV, far higher than that of LMD-ed 17-4PH steel. Besides, the laminated alloy shows a high <em>σ</em><sub><em>b</em></sub> (~1721.59<!-- --> <!-- -->MPa) with a sufficient <em>δ</em> (~5.21%), far higher than that of LMD-ed H13 steel (i.e., <em>σ</em><sub><em>b</em></sub> ~1701.41<!-- --> <!-- -->MPa and <em>δ</em> ~ 1.27%), which the fracture mode is mixed by ductile and cleavage fracture. The H13/17-4PH laminated alloy has excellent wear resistance at RT comparable to the LMD-ed H13 steel. Interestingly, the H13/17-4PH laminated alloy maintains low friction coefficients and wear rates at 600 ℃. Specifically, its high-temperature wear rate (22.28×10<sup>-6</sup> mm<sup>3</sup> N<sup>-1</sup>·m<sup>-1</sup>) is one-eighth as low as that of LMD-ed H13 steel (157.17×10<sup>-6</sup> mm<sup>3</sup> N<sup>-1</sup>·m<sup>-1</sup>). The above results provide a reference for re-manufacturing die steels in industrial applications of high-temperature wear resistance.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142369990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ni(OAc)2.4H2O and CoCl2.6H2O reacted with thiazole ligands, HL and HL' (where HL= (E)-2-(((4-phenylthiazol-2-yl)imino)methyl)phenol and HL'= (Z)-2-(2-benzylidenehydrazinyl)-4-phenylthiazole, in ethanol to create new mononuclear Co(II) and Ni(II) complexes, NiL2, CoL2, CoL'2, and NiL'2 (1-4). X-ray diffraction analysis, spectroscopic, and electrochemical methods were used to study the complexes. A carbon paste electrode that had been modified by complexes 1-4 was used as the working electrode in a three-electrode setup to test the complexes' ability in water oxidation reaction at pH 13. The linear sweep voltammetry (LSV) curves showed that complexes 2 and 3 have much greater activity and only require the overpotential of 570 and 690 mV ʋs. RHE at a current density of 10 mA/cm2 with Tafel slopes of 86.92 and 94.19 mVdec-1 respectively in an alkaline solution. In addition, the amperometry tests exhibited brilliant stability for water oxidation by CPE-complex 3 and CPE-complex 2 under electrochemical conditions at pH 13. Although X-ray diffraction patterns did not display a crystalline structure, the scanning electron microscopy images displayed that cobalt oxide and nickel oxide in an alkaline condition are proper catalysts for water oxidation reaction on the surface of the modified electrode.
{"title":"Water Oxidation through Electrocatalytic Process Using Cobalt and Nickel Complexes of Thiazole Schiff-base Ligands","authors":"Shadab Akbarpour, Behrouz Shaabani, Karim Asapour Zeynali","doi":"10.1016/j.jallcom.2024.176737","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.176737","url":null,"abstract":"Ni(OAc)<sub>2</sub>.4H<sub>2</sub>O and CoCl<sub>2</sub>.6H<sub>2</sub>O reacted with thiazole ligands, HL and HL' (where HL= (E)-2-(((4-phenylthiazol-2-yl)imino)methyl)phenol and HL'= (Z)-2-(2-benzylidenehydrazinyl)-4-phenylthiazole, in ethanol to create new mononuclear Co(II) and Ni(II) complexes, NiL<sub>2</sub>, CoL<sub>2</sub>, CoL'<sub>2</sub>, and NiL'<sub>2</sub> (<strong>1</strong>-<strong>4</strong>). X-ray diffraction analysis, spectroscopic, and electrochemical methods were used to study the complexes. A carbon paste electrode that had been modified by complexes <strong>1</strong>-<strong>4</strong> was used as the working electrode in a three-electrode setup to test the complexes' ability in water oxidation reaction at pH 13. The linear sweep voltammetry (LSV) curves showed that complexes <strong>2</strong> and <strong>3</strong> have much greater activity and only require the overpotential of 570 and 690<!-- --> <!-- -->mV ʋs. RHE at a current density of 10<!-- --> <!-- -->mA/cm<sup>2</sup> with Tafel slopes of 86.92 and 94.19 mVdec<sup>-1</sup> respectively in an alkaline solution. In addition, the amperometry tests exhibited brilliant stability for water oxidation by CPE-complex <strong>3</strong> and CPE-complex <strong>2</strong> under electrochemical conditions at pH 13. Although X-ray diffraction patterns did not display a crystalline structure, the scanning electron microscopy images displayed that cobalt oxide and nickel oxide in an alkaline condition are proper catalysts for water oxidation reaction on the surface of the modified electrode.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142369194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-02DOI: 10.1016/j.jallcom.2024.176856
Artem S. Mokrushin, Ilya A. Nagornov, Yulia M. Gorban, Sofia A. Dmitrieva, Tatiana L. Simonenko, Nikolay P. Simonenko, Marina S. Doronina, Iskander R. Vakhitov, Mikhail S. Nikitenko, Danila Yu. Khudonogov, Olesya V. Vershinina, Elizaveta P. Simonenko
ZnO/Pd nanocomposites containing 0.5-3.0 mol.% palladium and possessing improved gas-sensitive properties for VOC’s detection were prepared using solvothermal synthesis. The synthesised powders have been characterised using various methods of physicochemical analysis (DSC/TGA, XRD, SET/TEM, XPS). It is shown that Pd@PdO nanoparticles (4-7 nm in diameter) are localized on the surface of ZnO nanoparticles (40-50 nm in size). According to the combined XRD and XPS data, it was found that palladium is in partially oxidised state, and the nanocomposite has a structure close to "core@shell": Pd@PdO. The influence of palladium concentration in the ZnO/Pd composite on the complex of chemoresistive gas-sensitive properties was studied. It is shown that at 250°C the obtained nanocomposites demonstrate a high (up to 57.8 a.u.) response to 100 ppb–20 ppm acetone, which can be used as a part of supersensitive devices for noninvasive diagnostics of diseases.
{"title":"Synthesis of Pd-decorated ZnO nanocomposites with improved gas-sensitive properties for acetone detection","authors":"Artem S. Mokrushin, Ilya A. Nagornov, Yulia M. Gorban, Sofia A. Dmitrieva, Tatiana L. Simonenko, Nikolay P. Simonenko, Marina S. Doronina, Iskander R. Vakhitov, Mikhail S. Nikitenko, Danila Yu. Khudonogov, Olesya V. Vershinina, Elizaveta P. Simonenko","doi":"10.1016/j.jallcom.2024.176856","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.176856","url":null,"abstract":"ZnO/Pd nanocomposites containing 0.5-3.0<!-- --> <!-- -->mol.% palladium and possessing improved gas-sensitive properties for VOC’s detection were prepared using solvothermal synthesis. The synthesised powders have been characterised using various methods of physicochemical analysis (DSC/TGA, XRD, SET/TEM, XPS). It is shown that Pd@PdO nanoparticles (4-7<!-- --> <!-- -->nm in diameter) are localized on the surface of ZnO nanoparticles (40-50<!-- --> <!-- -->nm in size). According to the combined XRD and XPS data, it was found that palladium is in partially oxidised state, and the nanocomposite has a structure close to \"core@shell\": Pd@PdO. The influence of palladium concentration in the ZnO/Pd composite on the complex of chemoresistive gas-sensitive properties was studied. It is shown that at 250°C the obtained nanocomposites demonstrate a high (up to 57.8 a.u.) response to 100 ppb–20 ppm acetone, which can be used as a part of supersensitive devices for noninvasive diagnostics of diseases.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142369191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Engineered micro-nano heterogeneous architectures for transition metal phosphide (TMPs) anode materials in lithium-ion batteries (LIBs) provide multifunctional active components. These components synergistically interact to address pivotal challenges of pronounced volume expansion and sluggish reaction kinetics within the electrode. Consequently, this engineering design approach significantly enhances the overall battery performance. In this study, a self-assembled approach is employed to integrate hybridized NiFe-PBA nanocubes with two-dimensional (2D) monolayer MXene (Ti3C2Tx), producing a heterostructured NiFeP/C@Ti3C2Tx composite. In this meticulously engineered architecture, the interface between the outer MXene layer and NiFeP embedded within the carbon matrix exhibits several distinct superiorities, such as rapid interfacial ion migration, multidirectional migration pathways, and strong spatial adaptability. The resulting non-uniform phase structure effectively mitigates electrode expansion and enhances electronic conductivity. Consequently, the NiFeP/C@Ti3C2Tx-15 composite demonstrates distinct performance advantages over NiFeP/C without MXene. The composite achieves a specific capacity of 689.4 mAh g⁻¹ at 200 mA g⁻¹ over 300 cycles, double that of NiFeP/C. Furthermore, density functional theory (DFT) calculations validate the electronic conductivity facilitated by the heterointerface between MXene and NiFeP, substantiating the strategic significance of the heterostructure in advancing high-performance anode materials for lithium-ion batteries.
{"title":"Carbon matrix NiFeP/C nanoparticles anchored on Ti3C2Tx nanosheets as heterostructure high-performance anode for lithium-ion batteries","authors":"Yanyang Wang, Ruixiang Wang, Jiaming Liu, Zhenping Qiu, Xiaohua Yu, Weilai Xu, Jinhui Li, Fupeng Liu","doi":"10.1016/j.jallcom.2024.176846","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.176846","url":null,"abstract":"Engineered micro-nano heterogeneous architectures for transition metal phosphide (TMPs) anode materials in lithium-ion batteries (LIBs) provide multifunctional active components. These components synergistically interact to address pivotal challenges of pronounced volume expansion and sluggish reaction kinetics within the electrode. Consequently, this engineering design approach significantly enhances the overall battery performance. In this study, a self-assembled approach is employed to integrate hybridized NiFe-PBA nanocubes with two-dimensional (2D) monolayer MXene (Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>), producing a heterostructured NiFeP/C@Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> composite. In this meticulously engineered architecture, the interface between the outer MXene layer and NiFeP embedded within the carbon matrix exhibits several distinct superiorities, such as rapid interfacial ion migration, multidirectional migration pathways, and strong spatial adaptability. The resulting non-uniform phase structure effectively mitigates electrode expansion and enhances electronic conductivity. Consequently, the NiFeP/C@Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>-15 composite demonstrates distinct performance advantages over NiFeP/C without MXene. The composite achieves a specific capacity of 689.4 mAh g⁻¹ at 200<!-- --> <!-- -->mA<!-- --> <!-- -->g⁻¹ over 300 cycles, double that of NiFeP/C. Furthermore, density functional theory (DFT) calculations validate the electronic conductivity facilitated by the heterointerface between MXene and NiFeP, substantiating the strategic significance of the heterostructure in advancing high-performance anode materials for lithium-ion batteries.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142369189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-02DOI: 10.1016/j.jallcom.2024.176729
Sajeesh Vadakkedath Gopi, Nicolae Spalatu, Atanas Katerski, Jaroslav Kuliček, Bohuslav Rezek, Egor Ukraintsev, Markéta Šlapal Bařinková, Guillaume Zoppi, Liga Ignatane, Raitis Grzibovskis, Malle Krunks, Ilona Oja Acik
No Abstract
无摘要
{"title":"Corrigendum to “An alternative chlorine-assisted optimization of CdS/Sb2Se3 solar cells: Towards understanding of chlorine incorporation mechanism” [J. Alloy. Compd. 1005 (2024) 176175]","authors":"Sajeesh Vadakkedath Gopi, Nicolae Spalatu, Atanas Katerski, Jaroslav Kuliček, Bohuslav Rezek, Egor Ukraintsev, Markéta Šlapal Bařinková, Guillaume Zoppi, Liga Ignatane, Raitis Grzibovskis, Malle Krunks, Ilona Oja Acik","doi":"10.1016/j.jallcom.2024.176729","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.176729","url":null,"abstract":"No Abstract","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142369188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-02DOI: 10.1016/j.jallcom.2024.176819
Huijia Luo, Han Wang, Songqing Zhang, Junliang Liu, Yongling Ren, Cailei Yuan, Wen Lei
This work reports the controlled growth of single-crystalline β-Ag2Se nanowires and their application in near-infrared photodetection. High-quality Ag2Se nanowires with an orthorhombic crystal structure are grown via the chemical vapor deposition method with a length up to 32.8 and a diameter down to 52.1 nm. By fine-tuning the growth parameters such as total tube inner pressure and precursor temperature, the length of Ag2Se nanowires can be precisely controlled. A dynamic growth model is also introduced to interpret the growth mechanism of Ag2Se nanowires. Two-terminal photodetectors based on single Ag2Se nanowire are fabricated and show competitive photodetection performance compared to that of other silver chalcogenide nanomaterial-based photodetectors. At room temperature, the fabricated Ag2Se nanowire-based photodetector exhibits a broadband response range of 400 - 1064 nm at a bias voltage of 2 V, while the peak photo-response performance is obtained in the near-infrared region. Under 830 nm light illumination, the maximum responsivity, specific detectivity, rise time and decay time are measured and calculated to be 99.6 mA/W and 4.01 × 106 Jones, 23.84 ms and 47.6 ms, respectively, demonstrating its potential in uncooled near-infrared photodetector applications.
{"title":"Controlled growth of high-quality β-Ag2Se nanowires and their applications in near-infrared photodetection","authors":"Huijia Luo, Han Wang, Songqing Zhang, Junliang Liu, Yongling Ren, Cailei Yuan, Wen Lei","doi":"10.1016/j.jallcom.2024.176819","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.176819","url":null,"abstract":"This work reports the controlled growth of single-crystalline β-Ag<sub>2</sub>Se nanowires and their application in near-infrared photodetection. High-quality Ag<sub>2</sub>Se nanowires with an orthorhombic crystal structure are grown <em>via</em> the chemical vapor deposition method with a length up to 32.8 <span><span style=\"\"></span><span data-mathml='<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi mathvariant=\"normal\" is=\"true\">&#x3BC;</mi><mi mathvariant=\"normal\" is=\"true\">m</mi></math>' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"><svg aria-hidden=\"true\" focusable=\"false\" height=\"1.855ex\" role=\"img\" style=\"vertical-align: -0.697ex;\" viewbox=\"0 -498.8 1437 798.9\" width=\"3.338ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><g is=\"true\"><use xlink:href=\"#MJMATHI-3BC\"></use></g><g is=\"true\" transform=\"translate(603,0)\"><use xlink:href=\"#MJMAIN-6D\"></use></g></g></svg><span role=\"presentation\"><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi is=\"true\" mathvariant=\"normal\">μ</mi><mi is=\"true\" mathvariant=\"normal\">m</mi></math></span></span><script type=\"math/mml\"><math><mi mathvariant=\"normal\" is=\"true\">μ</mi><mi mathvariant=\"normal\" is=\"true\">m</mi></math></script></span> and a diameter down to 52.1<!-- --> <!-- -->nm. By fine-tuning the growth parameters such as total tube inner pressure and precursor temperature, the length of Ag<sub>2</sub>Se nanowires can be precisely controlled. A dynamic growth model is also introduced to interpret the growth mechanism of Ag<sub>2</sub>Se nanowires. Two-terminal photodetectors based on single Ag<sub>2</sub>Se nanowire are fabricated and show competitive photodetection performance compared to that of other silver chalcogenide nanomaterial-based photodetectors. At room temperature, the fabricated Ag<sub>2</sub>Se nanowire-based photodetector exhibits a broadband response range of 400 - 1064<!-- --> <!-- -->nm at a bias voltage of 2<!-- --> <!-- -->V, while the peak photo-response performance is obtained in the near-infrared region. Under 830<!-- --> <!-- -->nm light illumination, the maximum responsivity, specific detectivity, rise time and decay time are measured and calculated to be 99.6<!-- --> <!-- -->mA/W and 4.01 × 10<sup>6</sup> Jones, 23.84 ms and 47.6 ms, respectively, demonstrating its potential in uncooled near-infrared photodetector applications.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142369198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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