Superhydrophobic surfaces with self-cleaning, anti-biofouling and corrosion resistance merits are attractive for applications in major engineering fields. Generally, these surfaces possess low-surface-energy chemistry and micro- or nanoscale surface roughness. However, rough surfaces are fragile and highly susceptible to abrasion for high local pressures under mechanical load, causing loss of superhydrophobicity. In this study, we proposed a "fiber weaving/hard particles embedding-soft membrane" strategy to construct a kind of organic-inorganic composite coating by embedding micro-glass fiber (GF)/micro-TiB2/nano-SiO2 particles into the polydimethylsiloxane (PDMS)@polyurethane (PU) for fabricating robust superhydrophobic coating. The addition of micro-nano ceramic particles plays two roles including "hard" micro-skeletons to overcome vulnerable issue of "soft" organic membrane and creation of wear-resistant bearing points on the surface. Furthermore, "soft" membrane can absorb stress when subjected to external mechanical force and PU serves as an adhesive to improve interfacial bond strength. Additionally, GF intersperses in the coating, providing anchoring effect and PDMS serves as a modifier to decrease surface energy. Consequently, the proposed hybrid coating could simultaneously augment its mechanical robustness and multifunctional performance, breaking the notorious "trade-off" restriction of superhydrophobic coating. The preparation parameters and operation condition on the performance of the coating were investigated systematacially. The optimized superhydrophobic coating exhibits the highest water contact angle (WCA) of 167.3° ± 3.9°, the lowest sliding angle (SA) of 4.6° ± 1.3°, corrosion protection efficiency of 95.7 % in 3.5 wt% NaCl solution, with exceptional self-cleaning, anti-pollution, adaptability to various substrates, thermostable, anti-icing and mechanical stability properties, among the top-tier multifunctional performance. The inherent properties of micro-glass fiber, micro-TiB2 and nano-SiO2 ceramics and their highly ordered arrangement in the superhydrophobic coating are expected to provide an effective and versatile design proposal for potential applications in corrosion protection.
{"title":"Anti-corrosion superhydrophobic micro-GF/micro-TiB2/nano-SiO2 based coating with braid strengthening structure fabricated by a single-step spray deposition","authors":"Hejie Yang, Yiming Dong, Xuewu Li, Yimin Gao, Weiping He, Yuanhai Liu, Xianlian Mu, Yizhi Zhao","doi":"10.1016/j.jallcom.2024.176725","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.176725","url":null,"abstract":"Superhydrophobic surfaces with self-cleaning, anti-biofouling and corrosion resistance merits are attractive for applications in major engineering fields. Generally, these surfaces possess low-surface-energy chemistry and micro- or nanoscale surface roughness. However, rough surfaces are fragile and highly susceptible to abrasion for high local pressures under mechanical load, causing loss of superhydrophobicity. In this study, we proposed a \"fiber weaving/hard particles embedding-soft membrane\" strategy to construct a kind of organic-inorganic composite coating by embedding micro-glass fiber (GF)/micro-TiB<ce:inf loc=\"post\">2</ce:inf>/nano-SiO<ce:inf loc=\"post\">2</ce:inf> particles into the polydimethylsiloxane (PDMS)@polyurethane (PU) for fabricating robust superhydrophobic coating. The addition of micro-nano ceramic particles plays two roles including \"hard\" micro-skeletons to overcome vulnerable issue of \"soft\" organic membrane and creation of wear-resistant bearing points on the surface. Furthermore, \"soft\" membrane can absorb stress when subjected to external mechanical force and PU serves as an adhesive to improve interfacial bond strength. Additionally, GF intersperses in the coating, providing anchoring effect and PDMS serves as a modifier to decrease surface energy. Consequently, the proposed hybrid coating could simultaneously augment its mechanical robustness and multifunctional performance, breaking the notorious \"trade-off\" restriction of superhydrophobic coating. The preparation parameters and operation condition on the performance of the coating were investigated systematacially. The optimized superhydrophobic coating exhibits the highest water contact angle (WCA) of 167.3° ± 3.9°, the lowest sliding angle (SA) of 4.6° ± 1.3°, corrosion protection efficiency of 95.7 % in 3.5 wt% NaCl solution, with exceptional self-cleaning, anti-pollution, adaptability to various substrates, thermostable, anti-icing and mechanical stability properties, among the top-tier multifunctional performance. The inherent properties of micro-glass fiber, micro-TiB<ce:inf loc=\"post\">2</ce:inf> and nano-SiO<ce:inf loc=\"post\">2</ce:inf> ceramics and their highly ordered arrangement in the superhydrophobic coating are expected to provide an effective and versatile design proposal for potential applications in corrosion protection.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142329651","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}
In this study, we developed an in-situ deposition method to load small-sized AgI nanoparticles as an oxidative photocatalyst (OP) onto phosphorus (P) and potassium (K) co-doped two-dimensional porous g-C3N4 (PK-CN-N) as a reductive photocatalyst (RP), forming an S-scheme heterojunction photocatalyst AgI/PK-CN-N. PK-CN-N achieved morphology control and element doping, leading to surface functionalization and heterostructure formation for the AgI/PK-CN-N photocatalyst. Notably, the 50AgI/PK-CN-N composite demonstrated an approximately 95 % removal efficiency for RhB within 30 minutes, 17.6 times higher than pure g-C3N4, surpassing most reported g-C3N4-based photocatalysts. The enhanced photocatalytic efficiency is attributed to the surface modification strategy and heterostructure formation of g-C3N4, which broadens the visible light response range, increases the number of active sites, improves the separation of photogenerated electron-hole pairs, and enhances REDOX capabilities. The band structure of the composite was elucidated through Mott-Schottky analysis and UV–vis DRS. The formation of the AgI/PK-CN-N S-scheme heterojunction and its charge transfer mechanism was confirmed through XPS, band structure analysis, KPFM, and EPR spectroscopy. Experimental data confirmed the presence of a strong and effective interface electric field between the two semiconductors, leading to band bending and accelerated charge separation. Additionally, the introduction of small-sized AgI semiconductors enhanced the exposure of the coupling interface, further improving catalytic performance. The reusability and lifespan of the catalyst were also analyzed, showing that after four cycles, the photocatalytic activity remained above 92 %.
{"title":"Interface engineering of AgI/(P, K)-g-C3N4 novel S-scheme heterostructures as a highly efficient photocatalyst for RhB degradation","authors":"Zhangwei Sun, Yuhao Qi, Kaile Wang, Jiaming Li, Xiaoyu Qiu, Yunhe Zhao, Li Guo","doi":"10.1016/j.jallcom.2024.176712","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.176712","url":null,"abstract":"In this study, we developed an in-situ deposition method to load small-sized AgI nanoparticles as an oxidative photocatalyst (OP) onto phosphorus (P) and potassium (K) co-doped two-dimensional porous g-C<ce:inf loc=\"post\">3</ce:inf>N<ce:inf loc=\"post\">4</ce:inf> (PK-CN-N) as a reductive photocatalyst (RP), forming an S-scheme heterojunction photocatalyst AgI/PK-CN-N. PK-CN-N achieved morphology control and element doping, leading to surface functionalization and heterostructure formation for the AgI/PK-CN-N photocatalyst. Notably, the 50AgI/PK-CN-N composite demonstrated an approximately 95 % removal efficiency for RhB within 30 minutes, 17.6 times higher than pure g-C<ce:inf loc=\"post\">3</ce:inf>N<ce:inf loc=\"post\">4</ce:inf>, surpassing most reported g-C<ce:inf loc=\"post\">3</ce:inf>N<ce:inf loc=\"post\">4</ce:inf>-based photocatalysts. The enhanced photocatalytic efficiency is attributed to the surface modification strategy and heterostructure formation of g-C<ce:inf loc=\"post\">3</ce:inf>N<ce:inf loc=\"post\">4</ce:inf>, which broadens the visible light response range, increases the number of active sites, improves the separation of photogenerated electron-hole pairs, and enhances REDOX capabilities. The band structure of the composite was elucidated through Mott-Schottky analysis and UV–vis DRS. The formation of the AgI/PK-CN-N S-scheme heterojunction and its charge transfer mechanism was confirmed through XPS, band structure analysis, KPFM, and EPR spectroscopy. Experimental data confirmed the presence of a strong and effective interface electric field between the two semiconductors, leading to band bending and accelerated charge separation. Additionally, the introduction of small-sized AgI semiconductors enhanced the exposure of the coupling interface, further improving catalytic performance. The reusability and lifespan of the catalyst were also analyzed, showing that after four cycles, the photocatalytic activity remained above 92 %.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142329560","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 : 2024-09-25DOI: 10.1016/j.jallcom.2024.176694
Jun Li, Jianbo Zhang, Zetao Mou, Qihang Wan, Yuan Huang, Zumin Wang
Oxygen reduction reaction (ORR) is very important for the applications of energy devices such as fuel cells and metal-air batteries. A powerful catalyst is essential for ORR. It is known that Pt is the most effective ORR catalyst, but it is expensive. In this work, we have developed a Pt-anchored nanoporous gold catalyst (named NPG-Pt) for ORR. The NPG films were prepared from two-layer Au/a-Ge precursors by a novel solid-phase reaction method. Then, NPG-Ptx catalysts were prepared by adsorption and electroreduction method (x = 2, 4, and 6, representing the cycle numbers of cyclic voltammetry). It was found that the NPG film with a good three-dimensional porous structure provides sufficient active sites and improves Pt utilization, which further enhances ORR performance. Among all NPG-Ptx catalysts, NPG-Pt4 catalyst shows the highest specific and mass activity (1.75 mA cm−2 and 4.21 A mgPt−1). The results of X-ray photoelectron spectroscopy analysis confirmed that the electron structure of the NPG-Pt4 catalyst is more suitable than those of other NPG-Ptx catalysts, in which the d-band center shifts more negatively, which is beneficial for the optimal adsorption of oxygen-containing intermediates and the improvement of ORR activity. This work provides a realistic perspective for the development of promising nanoporous metal-based ORR catalysts.
{"title":"Pt-decorated nanoporous gold film prepared via solid-phase reaction for enhancing oxygen reduction electrocatalysis","authors":"Jun Li, Jianbo Zhang, Zetao Mou, Qihang Wan, Yuan Huang, Zumin Wang","doi":"10.1016/j.jallcom.2024.176694","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.176694","url":null,"abstract":"Oxygen reduction reaction (ORR) is very important for the applications of energy devices such as fuel cells and metal-air batteries. A powerful catalyst is essential for ORR. It is known that Pt is the most effective ORR catalyst, but it is expensive. In this work, we have developed a Pt-anchored nanoporous gold catalyst (named NPG-Pt) for ORR. The NPG films were prepared from two-layer Au/a-Ge precursors by a novel solid-phase reaction method. Then, NPG-Pt<ce:inf loc=\"post\"><ce:italic>x</ce:italic></ce:inf> catalysts were prepared by adsorption and electroreduction method (<ce:italic>x</ce:italic> = 2, 4, and 6, representing the cycle numbers of cyclic voltammetry). It was found that the NPG film with a good three-dimensional porous structure provides sufficient active sites and improves Pt utilization, which further enhances ORR performance. Among all NPG-Pt<ce:inf loc=\"post\"><ce:italic>x</ce:italic></ce:inf> catalysts, NPG-Pt<ce:inf loc=\"post\">4</ce:inf> catalyst shows the highest specific and mass activity (1.75 mA cm<ce:sup loc=\"post\">−2</ce:sup> and 4.21 A mg<ce:inf loc=\"post\">Pt</ce:inf><ce:sup loc=\"post\">−1</ce:sup>). The results of X-ray photoelectron spectroscopy analysis confirmed that the electron structure of the NPG-Pt<ce:inf loc=\"post\">4</ce:inf> catalyst is more suitable than those of other NPG-Pt<ce:inf loc=\"post\">x</ce:inf> catalysts, in which the d-band center shifts more negatively, which is beneficial for the optimal adsorption of oxygen-containing intermediates and the improvement of ORR activity. This work provides a realistic perspective for the development of promising nanoporous metal-based ORR catalysts.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142329601","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 : 2024-09-25DOI: 10.1016/j.jallcom.2024.176648
Jiahui Chen, Jin Ke, Jianli Zhou, Zheng Zhong, Jin Zhang
The polycrystalline yttria-stabilized zirconia (YSZ) used in many industrial applications usually possesses micron-sized grains in cubic phase. However, mechanical properties and deformation mechanisms of cubic-phase YSZ at such small scales remains almost unknown to date. Herein, the mechanical properties and deformation mechanisms of cubic-phase YSZ under compression at different scales are investigated through in situ micropillars compression and indentation experiments combined with molecular dynamics (MD) simulations. Our work reveals that the yield strength and Young's modulus of YSZ at the microscale are much smaller than those of its bulk counterpart. In addition, the failure of micron-sized YSZ under compression is mainly due to slipping, while, besides slipping, cracking also occurs in the bulk structure of YSZ. This study expands current knowledge of mechanical behaviors of small-scale cubic-phase YSZ, which can provide valuable guidance for the microstructure design of YSZ materials to enhance their mechanical performance.
{"title":"Size-dependent mechanical behaviors of cubic-phase yttria-stabilized zirconia","authors":"Jiahui Chen, Jin Ke, Jianli Zhou, Zheng Zhong, Jin Zhang","doi":"10.1016/j.jallcom.2024.176648","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.176648","url":null,"abstract":"The polycrystalline yttria-stabilized zirconia (YSZ) used in many industrial applications usually possesses micron-sized grains in cubic phase. However, mechanical properties and deformation mechanisms of cubic-phase YSZ at such small scales remains almost unknown to date. Herein, the mechanical properties and deformation mechanisms of cubic-phase YSZ under compression at different scales are investigated through <ce:italic>in situ</ce:italic> micropillars compression and indentation experiments combined with molecular dynamics (MD) simulations. Our work reveals that the yield strength and Young's modulus of YSZ at the microscale are much smaller than those of its bulk counterpart. In addition, the failure of micron-sized YSZ under compression is mainly due to slipping, while, besides slipping, cracking also occurs in the bulk structure of YSZ. This study expands current knowledge of mechanical behaviors of small-scale cubic-phase YSZ, which can provide valuable guidance for the microstructure design of YSZ materials to enhance their mechanical performance.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142329603","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 : 2024-09-25DOI: 10.1016/j.jallcom.2024.176710
M.T. Acar, O. Çomaklı, M.E. Arslan
This study investigates the effects of graphene amount on TiO2 nanotubes (TNT) synthesized on Ti6Al4V alloy via selective laser melting (SLM) to optimize corrosion resistance and biocompatibility. XRD analysis indicated the presence of anatase and rutile phases in TNTs, and the peak shifts indicated that graphene was successfully incorporated into the TNT structure. SEM images revealed that increasing the amount of graphene resulted in smaller nanotube diameters, increased contact angles, and imparted hydrophobic properties. Corrosion tests including Tafel polarization and electrochemical impedance spectroscopy (EIS) showed that graphene, especially C4-TNTs, exhibited superior corrosion resistance with high Ecorr and Rt values. Biocompatibility tests with human dermal fibroblast cells (HDFa) demonstrated cell viability with the incorporation of graphene into TNTs. The findings suggest that the optimum amount of graphene can significantly improve the corrosion resistance and biocompatibility of TiO2 nanotubes on Ti6Al4V alloy, making them more suitable for biomedical implants.
{"title":"Selective laser melting of Ti6Al4V alloy: Effects of graphene-TiO2 nanotubes composites corrosion and biocompatibility","authors":"M.T. Acar, O. Çomaklı, M.E. Arslan","doi":"10.1016/j.jallcom.2024.176710","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.176710","url":null,"abstract":"This study investigates the effects of graphene amount on TiO<ce:inf loc=\"post\">2</ce:inf> nanotubes (TNT) synthesized on Ti6Al4V alloy via selective laser melting (SLM) to optimize corrosion resistance and biocompatibility. XRD analysis indicated the presence of anatase and rutile phases in TNTs, and the peak shifts indicated that graphene was successfully incorporated into the TNT structure. SEM images revealed that increasing the amount of graphene resulted in smaller nanotube diameters, increased contact angles, and imparted hydrophobic properties. Corrosion tests including Tafel polarization and electrochemical impedance spectroscopy (EIS) showed that graphene, especially C4-TNTs, exhibited superior corrosion resistance with high Ecorr and Rt values. Biocompatibility tests with human dermal fibroblast cells (HDFa) demonstrated cell viability with the incorporation of graphene into TNTs. The findings suggest that the optimum amount of graphene can significantly improve the corrosion resistance and biocompatibility of TiO<ce:inf loc=\"post\">2</ce:inf> nanotubes on Ti6Al4V alloy, making them more suitable for biomedical implants.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142329561","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 : 2024-09-25DOI: 10.1016/j.jallcom.2024.176700
Chin-Wei Lin, Cheng-Jui Chung, Da-Wei Chen, Chih-Chieh Chiang, I.Nan Chen, Zhujialei Lei, Ssu-Yen Huang, Li Min Wang
This study investigated the inverse-proximity effect (IPE) and two-dimensional (2D) superconductivity in α-phase Ta films and Ta/Au bilayers. These bilayers were deposited onto silicon substrates using a direct current (DC) sputtering system. The findings reveal that higher substrate temperatures and increased film thickness facilitate the formation of α-Ta up to a temperature limit of 300°C, resulting in higher Tc around 3.5–3.7 K. The fundamental superconductivity of α-Ta thin films is similar to that of a conventional s-wave BCS superconductor. The IPE in the Ta/Au bilayer films was observed, where the Tc increases and decreases with the Au overlayer thickness. This behavior was quantitatively described by considering a model accounting for the reduced superconducting fluctuations induced by the highly conductive Au layer. Furthermore, the presence of 2D superconductivity in the Ta film and Ta/Au bilayer was examined through critical field analysis, vortex motions, and Berezinskii-Kosterlitz-Thouless (BKT) transition detection. Finally, the results were summarized in an H-T phase diagram illustrating the presence of IPE and 2D superconductivity in a Ta/Au bilayer. This study provides additional insights into 2D superconductivity within normal/superconductor (N/S) bilayers, laying the groundwork for future research to optimize film properties to align more closely with theoretical expectations.
本研究调查了 α 相 Ta 薄膜和 Ta/Au 双层膜中的逆接近效应 (IPE) 和二维 (2D) 超导性。这些双层膜是利用直流（DC）溅射系统沉积在硅衬底上的。研究结果表明，较高的基底温度和增加的薄膜厚度有利于α-Ta的形成，最高温度可达300°C，从而使Tc升高到3.5-3.7 K左右。α-Ta 薄膜的基本超导性类似于传统的 s 波 BCS 超导体。在钽/金双层薄膜中观察到了 IPE，其中 Tc 随金覆盖层厚度的增加而增大，随金覆盖层厚度的增加而减小。通过考虑高导电金层引起的超导波动减小模型，可以定量地描述这种行为。此外，还通过临界场分析、涡旋运动和 Berezinski-Kosterlitz-Thouless（BKT）转变检测，研究了 Ta 薄膜和 Ta/Au 双层中是否存在二维超导。最后，研究结果总结为 H-T 相图，该相图说明了钽/金双层层中存在 IPE 和二维超导。这项研究为了解正常/超导体（N/S）双层膜中的二维超导性提供了更多的见解，为今后的研究奠定了基础，以优化薄膜特性，使其更符合理论预期。
{"title":"Inverse-proximity effect and 2D superconductivity of Ta/Au bilayer thin films","authors":"Chin-Wei Lin, Cheng-Jui Chung, Da-Wei Chen, Chih-Chieh Chiang, I.Nan Chen, Zhujialei Lei, Ssu-Yen Huang, Li Min Wang","doi":"10.1016/j.jallcom.2024.176700","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.176700","url":null,"abstract":"This study investigated the inverse-proximity effect (IPE) and two-dimensional (2D) superconductivity in α-phase Ta films and Ta/Au bilayers. These bilayers were deposited onto silicon substrates using a direct current (DC) sputtering system. The findings reveal that higher substrate temperatures and increased film thickness facilitate the formation of α-Ta up to a temperature limit of 300°C, resulting in higher <ce:italic>T</ce:italic><ce:inf loc=\"post\">c</ce:inf> around 3.5–3.7 K. The fundamental superconductivity of α-Ta thin films is similar to that of a conventional <ce:italic>s</ce:italic>-wave BCS superconductor. The IPE in the Ta/Au bilayer films was observed, where the <ce:italic>T</ce:italic><ce:inf loc=\"post\">c</ce:inf> increases and decreases with the Au overlayer thickness. This behavior was quantitatively described by considering a model accounting for the reduced superconducting fluctuations induced by the highly conductive Au layer. Furthermore, the presence of 2D superconductivity in the Ta film and Ta/Au bilayer was examined through critical field analysis, vortex motions, and Berezinskii-Kosterlitz-Thouless (BKT) transition detection. Finally, the results were summarized in an <ce:italic>H</ce:italic>-<ce:italic>T</ce:italic> phase diagram illustrating the presence of IPE and 2D superconductivity in a Ta/Au bilayer. This study provides additional insights into 2D superconductivity within normal/superconductor (N/S) bilayers, laying the groundwork for future research to optimize film properties to align more closely with theoretical expectations.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142329565","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 : 2024-09-25DOI: 10.1016/j.jallcom.2024.176708
Weici Zhuang, Zhenying Huang, Qun Yu, Hongjie Wang, Xue Li, Youbo Wu, Zhou Du, Qianwen Sun, Dingfeng Pei, Wenqiang Hu
Configuration design and microstructure regulation are paramount strategies to surmount strength and ductility trade-offs in Aluminum Matrix Composites (AMCs). In this study, both methods were harnessed in fabricating, strengthening, and toughening quasi-continuous network structured (Ti3AlC2-Al3Ti)/2024Al composites: configuration design was applied through hot rolling, whereas microstructure regulation was facilitated via heat treatment. Hot rolling modified the network configuration and optimized the strain distribution by improving the matrix connectivity and the directional load-bearing capacity of the network structure. Subsequent heat treatment weakened grain orientation, gave full play to dynamic recrystallization and refined grains, and enhanced the dispersion of precipitates. Superior strength-ductility compatibility of 405 MPa (ultimate tensile strength), 242 MPa (tensile yield strength), and 12 % (elongation) was achieved, positioning it among the most competitive AMCs to date. Finite element analysis was employed for the in-situ monitoring of strain behaviors, elucidating the strengthening and toughening mechanisms.
{"title":"Study on configuration design and microstructure optimization of quasi-continuous network structured (Ti3AlC2-Al3Ti)/2024Al","authors":"Weici Zhuang, Zhenying Huang, Qun Yu, Hongjie Wang, Xue Li, Youbo Wu, Zhou Du, Qianwen Sun, Dingfeng Pei, Wenqiang Hu","doi":"10.1016/j.jallcom.2024.176708","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.176708","url":null,"abstract":"Configuration design and microstructure regulation are paramount strategies to surmount strength and ductility trade-offs in Aluminum Matrix Composites (AMCs). In this study, both methods were harnessed in fabricating, strengthening, and toughening quasi-continuous network structured (Ti<ce:inf loc=\"post\">3</ce:inf>AlC<ce:inf loc=\"post\">2</ce:inf>-Al<ce:inf loc=\"post\">3</ce:inf>Ti)/2024Al composites: configuration design was applied through hot rolling, whereas microstructure regulation was facilitated via heat treatment. Hot rolling modified the network configuration and optimized the strain distribution by improving the matrix connectivity and the directional load-bearing capacity of the network structure. Subsequent heat treatment weakened grain orientation, gave full play to dynamic recrystallization and refined grains, and enhanced the dispersion of precipitates. Superior strength-ductility compatibility of 405 MPa (ultimate tensile strength), 242 MPa (tensile yield strength), and 12 % (elongation) was achieved, positioning it among the most competitive AMCs to date. Finite element analysis was employed for the in-situ monitoring of strain behaviors, elucidating the strengthening and toughening mechanisms.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142329563","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}
With in-depth research on photocatalytic pollution removal, homojunction semiconductors stand out for their simple structure and stability. However, their similar energy levels result in lower photocatalytic activity compared to heterojunctions, limiting their applications in photocatalysis. Therefore, in this study, homojunction BiVO4 photocatalysts with staggered energy level structures were prepared by compositing crystalline facet-modified BiVO4 with oxygen vacancy-modified BiVO4 and used for the removal of ammonia nitrogen from water. The homojunction BiVO4 photocatalysts were successfully prepared, and the good photocatalytic performance of OBVV-2 was confirmed by several characterizations and tests, with the ammonia nitrogen removal rate of 84.3 % under visible light, of which 93.6 % was converted into harmless N2. The Z-scheme transfer mechanism was illustrated by radical capture experiments, and the repeated cycling experiments demonstrated that the homojunction photocatalysts have excellent stability. In conclusion, this study confirmed that the Z-scheme homojunction BiVO4 (OBVV-2) photocatalyst has good potential for application and provides a homojunction solution for efficient and green ammonia nitrogen removal.
随着光催化除污研究的深入，同质结半导体因其结构简单和稳定性而脱颖而出。然而，与异质结相比，它们相似的能级导致光催化活性较低，限制了它们在光催化领域的应用。因此，在本研究中，通过将晶体面修饰的 BiVO4 与氧空位修饰的 BiVO4 复合，制备了具有交错能级结构的同质结 BiVO4 光催化剂，并将其用于去除水中的氨氮。成功制备了同质结 BiVO4 光催化剂，并通过多项表征和测试证实 OBVV-2 具有良好的光催化性能，在可见光下的氨氮去除率为 84.3%，其中 93.6% 转化为无害的 N2。通过自由基捕获实验说明了 Z 型转移机制，反复循环实验证明了同质结光催化剂具有良好的稳定性。总之，该研究证实了 Z 型均相结 BiVO4（OBVV-2）光催化剂具有良好的应用潜力，并为高效、绿色去除氨氮提供了均相结解决方案。
{"title":"An investigation of Z-scheme homojunction BiVO4 photocatalysts for efficient green removal of ammonia nitrogen","authors":"Huining Zhang, Yang Cao, Jianping Han, Shaofeng Wang, Zongqian Zhang, Zhiqiang Wei, Zhiguo Wu, Ying Zhu, Qi Guo","doi":"10.1016/j.jallcom.2024.176640","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.176640","url":null,"abstract":"With in-depth research on photocatalytic pollution removal, homojunction semiconductors stand out for their simple structure and stability. However, their similar energy levels result in lower photocatalytic activity compared to heterojunctions, limiting their applications in photocatalysis. Therefore, in this study, homojunction BiVO<ce:inf loc=\"post\">4</ce:inf> photocatalysts with staggered energy level structures were prepared by compositing crystalline facet-modified BiVO<ce:inf loc=\"post\">4</ce:inf> with oxygen vacancy-modified BiVO<ce:inf loc=\"post\">4</ce:inf> and used for the removal of ammonia nitrogen from water. The homojunction BiVO<ce:inf loc=\"post\">4</ce:inf> photocatalysts were successfully prepared, and the good photocatalytic performance of OBVV-2 was confirmed by several characterizations and tests, with the ammonia nitrogen removal rate of 84.3 % under visible light, of which 93.6 % was converted into harmless N<ce:inf loc=\"post\">2</ce:inf>. The Z-scheme transfer mechanism was illustrated by radical capture experiments, and the repeated cycling experiments demonstrated that the homojunction photocatalysts have excellent stability. In conclusion, this study confirmed that the Z-scheme homojunction BiVO<ce:inf loc=\"post\">4</ce:inf> (OBVV-2) photocatalyst has good potential for application and provides a homojunction solution for efficient and green ammonia nitrogen removal.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142329605","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 simple and rapid grinding method for preparing Er3+-doped and Er3+/Yb3+co-doped Cs3Bi2Cl9 upconversion phosphors was developed. We avoid to employ strong acids as reaction solvents, aligning with the principles of green chemistry. By controlling the thermal treatment temperature and adding BiCl3, a reversible phase transformation process between Cs3Bi2Cl9 and Cs3BiCl6 perovskite phosphors was achieved. The Er3+/Yb3+ co-doped Cs3Bi2Cl9 phosphors emit green light under 980 nm excitation, whereas Cs3BiCl6 phosphors emit red light. Their temperature sensing performance was tested through variable-temperature processes. Compared to Er3+-doped Cs3Bi2Cl9 phosphors, the co-doped Er3+/Yb3+ phosphors have a higher relative sensitivity of 1.60 % K−1. Compared to previously reported materials, Cs3Bi2Cl9 phosphors show enhanced sensitivity in temperature sensing. The study demonstrates that lead-free halide perovskites’ unique color-tunability not only underscores the innovativeness of this synthetic strategy but also provides a significant technological foundation for temperature sensing applications. Given their environmental friendliness and facile preparation process, these phosphors possess notable advantages for industrial production and hold promise as potential candidates for next-generation high-performance phosphor materials.
{"title":"Enhanced temperature sensing in lead-free Cs3Bi2Cl9 perovskite co-doping Yb3+/Er3+ for optical thermometry application","authors":"Maohao Yang, Wanyin Ge, Peng He, Qian Zhang, Xin Xie","doi":"10.1016/j.jallcom.2024.176701","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.176701","url":null,"abstract":"A simple and rapid grinding method for preparing Er<ce:sup loc=\"post\">3+</ce:sup>-doped and Er<ce:sup loc=\"post\">3+</ce:sup>/Yb<ce:sup loc=\"post\">3+</ce:sup>co-doped Cs<ce:inf loc=\"post\">3</ce:inf>Bi<ce:inf loc=\"post\">2</ce:inf>Cl<ce:inf loc=\"post\">9</ce:inf> upconversion phosphors was developed. We avoid to employ strong acids as reaction solvents, aligning with the principles of green chemistry. By controlling the thermal treatment temperature and adding BiCl<ce:inf loc=\"post\">3</ce:inf>, a reversible phase transformation process between Cs<ce:inf loc=\"post\">3</ce:inf>Bi<ce:inf loc=\"post\">2</ce:inf>Cl<ce:inf loc=\"post\">9</ce:inf> and Cs<ce:inf loc=\"post\">3</ce:inf>BiCl<ce:inf loc=\"post\">6</ce:inf> perovskite phosphors was achieved. The Er<ce:sup loc=\"post\">3+</ce:sup>/Yb<ce:sup loc=\"post\">3+</ce:sup> co-doped Cs<ce:inf loc=\"post\">3</ce:inf>Bi<ce:inf loc=\"post\">2</ce:inf>Cl<ce:inf loc=\"post\">9</ce:inf> phosphors emit green light under 980 nm excitation, whereas Cs<ce:inf loc=\"post\">3</ce:inf>BiCl<ce:inf loc=\"post\">6</ce:inf> phosphors emit red light. Their temperature sensing performance was tested through variable-temperature processes. Compared to Er<ce:sup loc=\"post\">3+</ce:sup>-doped Cs<ce:inf loc=\"post\">3</ce:inf>Bi<ce:inf loc=\"post\">2</ce:inf>Cl<ce:inf loc=\"post\">9</ce:inf> phosphors, the co-doped Er<ce:sup loc=\"post\">3+</ce:sup>/Yb<ce:sup loc=\"post\">3+</ce:sup> phosphors have a higher relative sensitivity of 1.60 % K<ce:sup loc=\"post\">−1</ce:sup>. Compared to previously reported materials, Cs<ce:inf loc=\"post\">3</ce:inf>Bi<ce:inf loc=\"post\">2</ce:inf>Cl<ce:inf loc=\"post\">9</ce:inf> phosphors show enhanced sensitivity in temperature sensing. The study demonstrates that lead-free halide perovskites’ unique color-tunability not only underscores the innovativeness of this synthetic strategy but also provides a significant technological foundation for temperature sensing applications. Given their environmental friendliness and facile preparation process, these phosphors possess notable advantages for industrial production and hold promise as potential candidates for next-generation high-performance phosphor materials.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142329564","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 : 2024-09-25DOI: 10.1016/j.jallcom.2024.176697
Sina Maghool, Ali Akbar Asgharinezhad, Afsanehsadat Larimi, Cyrus Ghotbi, Farhad Khorasheh
A major obstacle in achieving massive operations water splitting is the slow rate of the anodic reaction. To address this issue, metal phosphates have been extensively employed as efficient materials for the oxygen evolution reaction (OER). In this study, ZIF-67 structures were synthesized in both single-metal and bimetallic forms with different molar ratios of cerium. The structure with the best electrochemical activity ((5 present) cerium doped ZIF-67 ((5)CeZIF-67)) was subjected to a phosphatization process, resulting in the formation of the amorphous and hollow cerium doped cobalt phosphate (Ce-CPO) structure as a novel and highly efficient OER electrocatalyst. To the best of authors knowledge, this is the first report on the synthesis and application of Ce-CPO structure for boosting OER process. This resultant structure exhibited suitable electrochemical performance in the oxygen evolution reaction (OER), achieving an overpotential of 286 mV at a current density of 30 mA cm−2 and a Tafel slope of 74.4 mV decade−1. Furthermore, the final structure demonstrated satisfactory stability during a 10 h operation period. The notable improvement in the Ce-CPO structure was due to the use of a bimetallic framework combined with phosphorus and an amorphous porous structure. The distinctive configuration achieved greatly amplifies the effective surface area, hence improving electron transfer. The findings of this research can contribute to the development of electrodes with improved performance in OER.
实现大规模水分离操作的一个主要障碍是阳极反应速度缓慢。为解决这一问题，金属磷酸盐已被广泛用作氧进化反应（OER）的高效材料。本研究以不同摩尔比的铈合成了单金属和双金属形式的 ZIF-67 结构。电化学活性最佳的结构（(5 present) 铈掺杂 ZIF-67 ((5)CeZIF-67)）经过磷化过程，形成了无定形的空心铈掺杂磷酸钴（Ce-CPO）结构，成为一种新型高效的 OER 电催化剂。据作者所知，这是第一份关于合成和应用 Ce-CPO 结构促进 OER 过程的报告。这种结构在氧进化反应（OER）中表现出合适的电化学性能，在电流密度为 30 mA cm-2 时，过电位为 286 mV，塔菲尔斜率为 74.4 mV/10-1。此外，最终结构在 10 小时的运行期间表现出令人满意的稳定性。Ce-CPO 结构的显著改进是由于使用了一种结合了磷和非晶多孔结构的双金属框架。这种独特的结构大大增加了有效表面积，从而改善了电子传输。这项研究成果有助于开发性能更好的 OER 电极。
{"title":"Enhanced oxygen evolution reaction performance using amorphous hollow cerium-doped cobalt phosphate derived from ZIF-67 structures","authors":"Sina Maghool, Ali Akbar Asgharinezhad, Afsanehsadat Larimi, Cyrus Ghotbi, Farhad Khorasheh","doi":"10.1016/j.jallcom.2024.176697","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.176697","url":null,"abstract":"A major obstacle in achieving massive operations water splitting is the slow rate of the anodic reaction. To address this issue, metal phosphates have been extensively employed as efficient materials for the oxygen evolution reaction (OER). In this study, ZIF-67 structures were synthesized in both single-metal and bimetallic forms with different molar ratios of cerium. The structure with the best electrochemical activity ((5 present) cerium doped ZIF-67 ((5)CeZIF-67)) was subjected to a phosphatization process, resulting in the formation of the amorphous and hollow cerium doped cobalt phosphate (Ce-CPO) structure as a novel and highly efficient OER electrocatalyst. To the best of authors knowledge, this is the first report on the synthesis and application of Ce-CPO structure for boosting OER process. This resultant structure exhibited suitable electrochemical performance in the oxygen evolution reaction (OER), achieving an overpotential of 286 mV at a current density of 30 mA cm<ce:sup loc=\"post\">−2</ce:sup> and a Tafel slope of 74.4 mV decade<ce:sup loc=\"post\">−1</ce:sup>. Furthermore, the final structure demonstrated satisfactory stability during a 10 h operation period. The notable improvement in the Ce-CPO structure was due to the use of a bimetallic framework combined with phosphorus and an amorphous porous structure. The distinctive configuration achieved greatly amplifies the effective surface area, hence improving electron transfer. The findings of this research can contribute to the development of electrodes with improved performance in OER.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142329567","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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