Ping Zhang, Xiujie Yue, Yajie Sun, Hanping Zhou, Youqiang Wang
{"title":"Ultrasonic Peening-Water Jet combined Surface Modification Mechanism and Surface Integrity Study of 7075 Aluminum Alloy","authors":"Ping Zhang, Xiujie Yue, Yajie Sun, Hanping Zhou, Youqiang Wang","doi":"10.1016/j.jallcom.2024.177706","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177706","url":null,"abstract":"This study employs an orthogonal experimental framework to investigate the effects of ultrasonic peening and solid projectile with water jet (UIT-SPEWJ) as a hybrid surface enhancement method on the surface integrity of 7075-T6 aluminum alloy. The research delves into the impact of various processing parameters on the alloy’s surface characteristics, encompassing surface finish, microhardness, residual stresses, and microstructural alterations. Our findings reveal a variation in surface roughness post-treatment, ranging from 0.852 to 2.411 μm; When the jet pressure was 25<!-- --> <!-- -->MPa, the jet target distance was 7.5<!-- --> <!-- -->mm, and the ultrasonic amplitude was 5 μm (referred to as UIT-SPEWJ-6), the surface roughness was the lowest at 0.852 μm. In contrast, when the jet pressure was 20<!-- --> <!-- -->MPa, the jet target distance was 12.5<!-- --> <!-- -->mm, and the ultrasonic amplitude was 20 μm (referred to as UIT-SPEWJ-4), the surface roughness was the highest at 2.411 μm. Surface textures displayed notable features such as crater-like indentations, adhered debris, and microporosity. The microhardness values on the treated surfaces were measured between 180 and 240 HV, marking an enhancement of 2.2% to 36.3% over the untreated samples. Among the specimens, UIT-SPEWJ-6 exhibited the deepest hardening effect with a layer reaching 240 μm, whereas UIT-SPEWJ-4 showed the shallowest at approximately 210 μm. Residual compressive stresses were observed to lie between 277 and 530<!-- --> <!-- -->MPa, which denotes a substantial increase of 394.6% to 846.4% over the baseline stress of 56<!-- --> <!-- -->MPa in untreated samples. Morphologically, UIT-SPEWJ-4 displayed continuous precipitate-free zones (PFZs) measuring 11 to 23<!-- --> <!-- -->nm and abundant precipitates within 42 to 61<!-- --> <!-- -->nm accompanied by pronounced dislocation activity. In contrast, UIT-SPEWJ-6 revealed discontinuous PFZs ranging from 7 to 16<!-- --> <!-- -->nm, smaller precipitates between 22 and 36<!-- --> <!-- -->nm, refined grain structures, and a higher dislocation density.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"188 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142684677","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}
Ali Akhtar, Shama Sadaf, Rujun Zhou, Qiang Ling, Si Luo, Mingming Han, Wu Di, Jianqiao Liu, Daru Chen, Xiangfeng Chu
{"title":"Highly responsive and stable room temperature acetic acid gas sensor based on nano-composite of MXene Ti3C2TX-NiCo2O4-MnO2","authors":"Ali Akhtar, Shama Sadaf, Rujun Zhou, Qiang Ling, Si Luo, Mingming Han, Wu Di, Jianqiao Liu, Daru Chen, Xiangfeng Chu","doi":"10.1016/j.jallcom.2024.177715","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177715","url":null,"abstract":"Designing novel acetic acid gas sensors is highly imperative for human health. Two-dimensional (2D) layered MXene Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> is becoming an emerging and promising material in gas sensing. In this manuscript, the hydrothermal method was used to synthesize MXenes Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>/Nb<sub>2</sub>CT<sub>x</sub> supported NiCo<sub>2</sub>O<sub>4</sub>-MnO<sub>2</sub> composites and pure materials. The structure, chemical composition and morphology of the samples were studied by SEM, EDS, TEM, HRTEM, XRD, BET, FTIR, UV-visible, XPS and Raman, justifying the successful synthesis of products. The layered structure of Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> enhanced the BET surface area and provided sufficient sites, which assisted the gas sensing improvement. The gas sensors were fabricated from synthesized products and were tested for different kinds of VOCs deeply. The results exposed that the gas sensor of Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>-NiCo<sub>2</sub>O<sub>4</sub>-MnO<sub>2</sub> (5% of Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>=NCO-Mn-Ti-5) was highly sensitive to 20 ppm acetic acid and very less responsive to all other VOCs (acetone, TMA, ethanol, methanol, formaldehyde, acetaldehyde, acetylene and xylene) at room temperature. The response (R<sub>g</sub>/R<sub>a</sub>) to 20 ppm acetic acid was 12.5 and the lowest detection limit was 0.05 ppm. Additionally, the sensor of NCO-Mn-Ti-5 revealed great stability/reproducibility, short response/recovery times and linearity between acetic acid concentration and response. The idea of the novel sensor (NCO-Mn-Ti-5) could be potentially useful in the field of sensors.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"38 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142684680","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}
{"title":"High-sensitivity and ultra-broad linear working region flexible piezoresistive pressure sensors based on PDMS/CNT/TPU","authors":"Zhiwen Chen, Jingchen Ma, Xiaoyu Zhang, Aixiang Wei, Ningqi Luo, Yuding He, Yu Zhao, Zhen Liu, Jiaxiong Xu","doi":"10.1016/j.jallcom.2024.177711","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177711","url":null,"abstract":"Designing and fabricating flexible piezoresistive pressure sensors (FPPS) with simultaneous high sensitivity and a broad linear working region remains a considerable challenge. In this work, thermoplastic polyurethane (TPU) fiber films were first prepared via electrospinning. Then, the CNTs were anchored onto the surface of a TPU fiber films via ultrasonication as the driving force. Finally, polydimethylsiloxane (PDMS) was used to modify the CNT/TPU and obtain the PDMS/CNT/TPU composite materials. The electrical and mechanical properties of CNT/TPU and PDMS/CNT/TPU were studied. The sensor performances of FPPS based on CNT/TPU and PDMS/CNT/TPU were analyzed and compared. These results prove that the sensitivity of FPPS is significantly improved after the PDMS modification. The optimized PDMS/CNT/TPU FPPS has a sensitivity of 1.43 kPa<sup>-1</sup> in a ultra-broad linear working region of 0-2500 kPa and cycling stability over 6000 cycles. FPPS has been successfully used to monitor physiological signals and human movements, which indicates great potential for wearable electronics and human-machine interfaces.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"16 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142684681","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}
Muhammad Nauman Tahir, Gui Yang, Yang Wu, Juan Long, Dan Xiong, Xiaomin Ren, Bin Huang, Xuejun Pan
{"title":"Controllable fabrication of Fluorite-type Bi4MoO9 nanocrystals with well-defined octahedral shape for visible-light photocatalytic degradation","authors":"Muhammad Nauman Tahir, Gui Yang, Yang Wu, Juan Long, Dan Xiong, Xiaomin Ren, Bin Huang, Xuejun Pan","doi":"10.1016/j.jallcom.2024.177714","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177714","url":null,"abstract":"The Fluorite-type Bi<sub>4</sub>MoO<sub>9</sub> nanocrystals with well-defined octahedral shape were successfully synthesized via a facile hydrothermal route. The structural transformation from the Aurivillius-type Bi<sub>2</sub>MoO<sub>6</sub> nanocrystals to the Fluorite-related nanocrystals (Bi<sub>4</sub>MoO<sub>9</sub>) can be efficiently and precisely controlled by regulating the pH value of the reaction. The influences of reaction time and temperature were investigated to gain a deep understanding of the formation process of octahedral-shaped Bi<sub>4</sub>MoO<sub>9</sub>. Furthermore, the photocatalytic activity results showed that the octahedral Bi<sub>4</sub>MoO<sub>9</sub> single crystals manifested excellent photocatalytic activities for the degradation of tetracycline (TC), rhodamine B (RhB), and bisphenol A (BPA). Additionally, the possible degradation intermediates of TC were unraveled and the ecotoxicity changes of identified TC intermediates were evaluated in detail. This present study develops a novel morphology structure of Bi<sub>4</sub>MoO<sub>9</sub> and highlights its promise in the field of environmental remediation.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"15 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142684687","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}
Peter Benard Oboso, Seiya Oyama, Julia Horioka, Li-Fu Yi, Tetsuhiko Onda, Shigekazu Morito, Zhong-Chun Chen
{"title":"Microstructure and mechanical properties of CuCrFeNi medium entropy alloys synthesized via mechanical alloying and spark plasma sintering","authors":"Peter Benard Oboso, Seiya Oyama, Julia Horioka, Li-Fu Yi, Tetsuhiko Onda, Shigekazu Morito, Zhong-Chun Chen","doi":"10.1016/j.jallcom.2024.177700","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177700","url":null,"abstract":"In this study, two novel Co-free medium entropy alloys (MEAs) with compositions of Cu<sub>20</sub>Cr<sub>10</sub>Fe<sub>35</sub>Ni<sub>35</sub> (Cu20) and Cu<sub>10</sub>Cr<sub>20</sub>Fe<sub>35</sub>Ni<sub>35</sub> (Cu10) were successfully prepared by a combination of mechanical alloying (MA) and spark plasma sintering (SPS). The Cu20 alloy exhibited a heterogeneous microstructure consisting of coarse and ultrafine grains (UFG) with a face-centered cubic (FCC) structure. In contrast, the Cu10 alloy showed a homogeneous UFG microstructure with an FCC matrix and a small amount of BCC phase. Moreover, both alloys contained a small amount of Cr<sub>7</sub>C<sub>3</sub> particles, introduced by milling media during MA. In comparison with the Cu20 alloy, the Cu10 alloy exhibited better tensile properties, <em>e.g.</em>, yield strength of 712<!-- --> <!-- -->MPa, ultimate tensile strength of 843<!-- --> <!-- -->MPa, and elongation of 20.1%, demonstrating an excellent balance between strength and ductility compared to some well-established FCC-structured multi-component MEAs and high entropy alloys (HEAs). The enhanced tensile properties of the Cu10 alloy are attributed to the synergistic effects of grain refinement and Orowan strengthening by the fine Cr<sub>7</sub>C<sub>3</sub> particles. The findings of this work provide valuable insights for designing cost-effective HEAs and MEAs with high strength and desirable ductility for various structural applications.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142684690","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}
{"title":"Boost efficiency with buffer and bottom stack optimization in Cu2BaSn(S,Se)4 solar cells by simulation","authors":"Kaviya Tracy Arockiya Dass, Aruna-Devi Rasu Chettiar, Evangeline Linda, Latha Marasamy","doi":"10.1016/j.jallcom.2024.177707","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177707","url":null,"abstract":"Cu<sub>2</sub>BaSn(S,Se)<sub>4</sub> is gaining tremendous attention as a potential absorber due to its non-toxicity, earth abundance, and low antisite defects opposing Cu<sub>2</sub>ZnSn(S,Se)<sub>4</sub>. However, the highest experimental efficiency of 6.17% is achieved with the device structure Al:ZnO/Mg:ZnO/Zn<sub>1-x</sub>Cd<sub>x</sub>S/Cu<sub>2</sub>BaSn(S,Se)<sub>4</sub>/Mo where the drawback is large open circuit voltage (V<sub>OC</sub>) loss stemming from the large cliff at the absorber/buffer interface and back contact recombination. Therefore, finding a suitable non-toxic buffer with modification of the bottom stack is crucial. In this regard, Cu<sub>2</sub>BaSn(S,Se)<sub>4</sub> solar cells based on diverse buffers are numerically simulated using SCAPS-1D with Ni as back contact and introducing back surface field (BSF) at the absorber/Ni interface. At first, a baseline model validating the experimental efficiency is designed. The application of Ni enhanced efficiency to 7.92% due to the formation of ohmic contact. Further, it is improved to 9.91% with anti-reflection coating. Afterward, a total of 780 solar cells were designed with six buffer and eight BSF combinations by optimizing the absorber, buffer, and interface properties where the highest efficiency of 28.11% with incredible fill factor (90%) and less V<sub>OC</sub> loss (0.24<!-- --> <!-- -->V) is accomplished for the AZO/ZMO/TiO<sub>2</sub>/Cu<sub>2</sub>BaSn(S,Se)<sub>4</sub>/CuI/Ni solar cell. Further, the importance of BSF is analyzed via energy band diagrams, Mott-Schottky and Nyquist plots. The outcomes disclosed that the BSF greatly influences the energy band alignment, built-in potential, depletion width, and recombination resistance of solar cells, underscoring its significance in improving performance. Overall, the present work proposes an efficient strategy to modify the device configuration of Cu<sub>2</sub>BaSn(S,Se)<sub>4</sub> solar cells to enhance their efficiency.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"23 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142684683","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}
{"title":"Molecular doping of graphitic carbon nitride for enhanced visible light-driven photodegradation of organic contaminants","authors":"Guowei Wang, Shuang Fu, Peng Hou, Yuedong Li, Chunxue Cui, Tonghui Yi, Hongguang Zhang","doi":"10.1016/j.jallcom.2024.177713","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177713","url":null,"abstract":"Utilizing solar energy for photodegradation of organic contaminants is an attractive strategy for environmental remediation. However, the synthesis of photocatalysts for efficient use of solar energy remains a challenge. Herein, we designed and synthesized a hierarchical and porous g-C<sub>3</sub>N<sub>4</sub> (CN) via thermal polymerization of 5-amino-1H-tetrazole (ATZ) and melamine molecules. Experimental results demonstrate that the incorporation of electron-deficient ATZ into the CN structure drastically promotes the separation and transport of photoexcited charge carriers, and increases the specific surface area and pore size of the sample. Based on these unique features, the optimal CN-ATZ1 sample exhibited excellent photocatalytic activity with a rate constant of 0.091<!-- --> <!-- -->min<sup>-1</sup> for the degradation of rhodamine B (RhB) under visible light irradiation, which was about 10.71 times higher than that of bulk CN. Radical trapping experiments demonstrate that the superoxide radical (•O<sub>2</sub><sup>−</sup>) is the major active species during the photodegradation process. This study provides a feasible strategy for the design and construction of g-C<sub>3</sub>N<sub>4</sub> photocatalysts with high degradation activity.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"129 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142684621","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}
{"title":"Low-temperature preparation of nano-sized Al2TiO5 powder via non-hydrolytic sol-gel route with Al metal as the aluminum source","authors":"Quan Zhang, Junxiong Zhang, Yu Cao, Feng Jiang, Guo Feng, Jianmin Liu, Jian Liang, Hua Li, Qing Hu, Zhifang Xu","doi":"10.1016/j.jallcom.2024.177716","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177716","url":null,"abstract":"Al<sub>2</sub>TiO<sub>5</sub> powder was prepared using the non-hydrolytic sol-gel route, with Al powder and titanium tetrachloride as precursor materials. The synthesized powder was characterized via XRD, DSC-TG, TEM, FTIR, FE-SEM, and laser particle size analyzer. The results indicated that Al<sub>2</sub>TiO<sub>5</sub> powder can be synthesized at 750 ℃ via gelation when the aluminum-to-alcohol molar ratio was 1:14 and titanium tetrachloride concentration was 0.9<!-- --> <!-- -->mol/L. The average particle size of Al<sub>2</sub>TiO<sub>5</sub> powder was 80<!-- --> <!-- -->nm using reflux gelation and 35<!-- --> <!-- -->nm with direct drying gelation. The Al metal utilized the hydrogen chloride produced in situ to activate itself and formed Al-O-Ti hetero-bonds through non-hydrolytic polycondensation. The Al-O-Ti hetero-bonds underwent an exothermic reaction at around 695 ℃ to form Al<sub>2</sub>TiO<sub>5</sub>. This research has broadened the range of precursor materials available for preparing Al<sub>2</sub>TiO<sub>5</sub> using the non-hydrolytic sol-gel route.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"110 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142684684","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}
Jun Han, Junhui Shao, Xingchen He, Najun Li, Shuxian Wang, Dongyun Chen, Jianmei Lu
{"title":"Boosting piezocatalytic activity for hydrogen bonding self-assembled Ti3C2/BaTiO3 heterojunction via accumulated piezoelectric effect","authors":"Jun Han, Junhui Shao, Xingchen He, Najun Li, Shuxian Wang, Dongyun Chen, Jianmei Lu","doi":"10.1016/j.jallcom.2024.177697","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177697","url":null,"abstract":"Constructing heterojunctions has been proved to effectively improve the carrier transfer capability for enhanced catalytic activity. Herein, Ti<sub>3</sub>C<sub>2</sub>/BaTiO<sub>3</sub> heterojunctions were fabricated through self-assembly driven by hydrogen bonding between piezoelectric barium titanate (BaTiO<sub>3</sub>) stabilized by oleic acid molecules and titanium carbide (Ti<sub>3</sub>C<sub>2</sub>) with surficial functional groups under continuous ultrasonic vibration. Owing to the formation of heterojunction, the separation of free charges can be promoted by the conductive Ti<sub>3</sub>C<sub>2</sub>. Additionally, the recombination of electrons and holes pairs in BaTiO<sub>3</sub> can be hindered by built-in piezoelectric field. Hence, the piezocatalytic activity of Ti<sub>3</sub>C<sub>2</sub>/BaTiO<sub>3</sub> was significantly enhanced by the accumulated piezoelectric effect, maintaining stability during the piezocatalytic degradation of bisphenol A and achieving rate constants that were 22.2 and 3.2 times higher than those of Ti<sub>3</sub>C<sub>2</sub> and BaTiO<sub>3</sub>, respectively. This work thus presents a novel strategy for designing high-activity heterojunction piezocatalysts through hydrogen bonding self-assembly.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"188 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142684689","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}
Amira. H. Abdelhamid, Asmaa. M.A. Omar, Nadia. H. Yahia, M.M. El-Rabiei, Sameh S. Ali, Gomaa Khabiri, Hemdan S.H. Mohamed
{"title":"In-Situ Growing of MIL88A(Fe)@Active Faceted Cu2O Core-Shell Heterostructure for Super Photocatalytic Performance and Catalytic Reduction of Toxic Nitrophenol Compounds","authors":"Amira. H. Abdelhamid, Asmaa. M.A. Omar, Nadia. H. Yahia, M.M. El-Rabiei, Sameh S. Ali, Gomaa Khabiri, Hemdan S.H. Mohamed","doi":"10.1016/j.jallcom.2024.177701","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177701","url":null,"abstract":"Herein, well-constructed 2D active (110) and (111) faceted Cu<sub>2</sub>O nanosheets are in-situ grown on the surface of spindle MIL-88A to form a novel porous MIL88A (Fe)@active faceted Cu<sub>2</sub>O core-shell heterostructure via a facile solvothermal method. The fabricated heterostructure is optimized to be a promising catalyst for the catalytic reduction of various nitrophenol compounds such as P-nitrophenol and 2,4-dinitrophenols, as well as the removal of methylene blue dye (MB). The optimal M88@Cu<sub>2</sub>O-2 heterostructure demonstrated an outstanding catalytic performance for reducing nitrophenols, reaching 96.7% for P-nitrophenol and 96.1% for 2.4-dinitrophenol. It also achieved excellent photocatalytic activity for MB dye, reaching 95% through 30<!-- --> <!-- -->min, compared to 64% and 72% for Cu<sub>2</sub>O and MIL-88A, with rate constants (k) reaching 0.1, 0.038, and 0.04<!-- --> <!-- -->min<sup>-1</sup>, respectively. The surprising photocatalytic performance of the prepared structure could be attributed to the following aspects: (i) the growth of the active (111) and (110) facets Cu<sub>2</sub>O on the surface of MIL-88A, which could provide various surface energies, reactivates, and crystallographic arrangements, all of which impact the photocatalytic efficiency of the designed M88@Cu<sub>2</sub>O-2 heterostructure, (ii) the construction of an efficient heterojunction between active faceted Cu<sub>2</sub>O and MIL88A, which resists the recombination of e<sup>-</sup> and h<sup>+</sup>, improving the migration and separation of charge carriers, and (iii) the core-shell construction could provide more electron transport channels to significantly enhance the suppression of electron-hole pair recombination in the photocatalytic process. Besides that, the M88@Cu<sub>2</sub>O-2 core-shell has great photo-electrochemical performance, reaching 17.68 μA/cm<sup>2</sup> for the photocurrent test and 73<!-- --> <!-- -->mA/cm<sup>2</sup> for the LSV test when exposed to visible light. Our study will provide a new vision for developing more hierarchical core/shell MOF-based heterostructures with outstanding multifunctional performance for future industrial practice.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"129 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678178","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}