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Self-Supported ZIF-67 nanosheets on nickel foam: A Co-MOF-based high-performance electrode for supercapacitor applications
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-17 DOI: 10.1016/j.matlet.2025.138419
Mohit Bhatt , Kajal Gautam , A.K. Sinha
{"title":"Self-Supported ZIF-67 nanosheets on nickel foam: A Co-MOF-based high-performance electrode for supercapacitor applications","authors":"Mohit Bhatt ,&nbsp;Kajal Gautam ,&nbsp;A.K. Sinha","doi":"10.1016/j.matlet.2025.138419","DOIUrl":"10.1016/j.matlet.2025.138419","url":null,"abstract":"<div><div>In this work, the electrochemical performance of in-situ grown ZIF-67 nanosheets on nickel foam (ZIF-67@NF) is reported. The nanosheets were synthesized via a one-step hydrothermal method and characterized using different techniques to confirm their crystal structure, functional groups, and morphology. Electrochemical tests revealed that ZIF-67@NF delivered a high specific capacitance of 2195.23F/g at 1 A/g and retained 1000F/g at 10 A/g. The material demonstrated excellent cycling stability of 83.07% after 10,000 cycles at 10 A/g, showcasing its potential for high-performance supercapacitors.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"389 ","pages":"Article 138419"},"PeriodicalIF":2.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143643518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Construction of WO3/g-C3N4 heterojunction via cold plasma for enhanced visible-light-driven photocatalysis
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-17 DOI: 10.1016/j.matlet.2025.138413
Likang Wang, Yuxin Li, Zhao Wang
{"title":"Construction of WO3/g-C3N4 heterojunction via cold plasma for enhanced visible-light-driven photocatalysis","authors":"Likang Wang,&nbsp;Yuxin Li,&nbsp;Zhao Wang","doi":"10.1016/j.matlet.2025.138413","DOIUrl":"10.1016/j.matlet.2025.138413","url":null,"abstract":"<div><div>In this study, WO<sub>3</sub>/g-C<sub>3</sub>N<sub>4</sub> composites were synthesized using a cold plasma method. The high-energy electrons generated by cold plasma facilitated the formation of nitrogen vacancies in g-C<sub>3</sub>N<sub>4</sub> and oxygen vacancies in WO<sub>3</sub>. These defect sites enhanced the interfacial interactions between WO<sub>3</sub> and g-C<sub>3</sub>N<sub>4</sub>, enabling the construction of efficient WO<sub>3</sub>/g-C<sub>3</sub>N<sub>4</sub> heterojunctions. The formation of the heterojunctions resulted in a reduced band gap and improved separation efficiency of photogenerated electron-hole pairs, significantly enhancing the photocatalytic degradation performance under visible light irradiation. The composite achieved an exceptional Rhodamine B degradation rate of 96 % within 40 min, with reaction rates 5.9 and 22.8 times higher than those of g-C<sub>3</sub>N<sub>4</sub> and WO<sub>3</sub>, respectively.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"389 ","pages":"Article 138413"},"PeriodicalIF":2.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143643969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Preparation and properties of Baicalein loaded sodium alginate/polyvinyl alcohol nanofiber antibacterial wound dressing
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-17 DOI: 10.1016/j.matlet.2025.138408
Yexiong Qi , Peiyu Wang , Qingchen Lu , Zena Zhou , Yanhui Hu
{"title":"Preparation and properties of Baicalein loaded sodium alginate/polyvinyl alcohol nanofiber antibacterial wound dressing","authors":"Yexiong Qi ,&nbsp;Peiyu Wang ,&nbsp;Qingchen Lu ,&nbsp;Zena Zhou ,&nbsp;Yanhui Hu","doi":"10.1016/j.matlet.2025.138408","DOIUrl":"10.1016/j.matlet.2025.138408","url":null,"abstract":"<div><div>Bacterial infection is an essential factor affecting wound healing, which seriously hinders the process of wound healing. Developing a medical dressing loaded with traditional Chinese medicine ingredients is an effective way to promote wound healing. In this paper, we developed a Sodium alginate/polyvinyl alcohol (SA/PVA) nanofiber containing Baicalein (Ba) by electrospinning for medical dressings. Baicalein contains hydroxyl groups, which gives the prepared nanofibers uniform diameter, good hydrophilicity and high thermal stability. The results of in vitro experiments showed that the inhibition rate of 15%Ba/SA/PVA nanofiber against S. aureus and E. coli were 98.86% and 99.58%, respectively. Moreover, the drug release rate of 15%Ba/SA/PVA nanofiber was 78%. This drug-loaded nanofiber has a massive potential as an excellent antibacterial dressing for wound healing.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"389 ","pages":"Article 138408"},"PeriodicalIF":2.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143643971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Ni60-WC-Co double-layer coating fabricated on TC4 alloy substrate using the rapid hot pressing sintering
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-17 DOI: 10.1016/j.matlet.2025.138416
Xinxing Li , Hu Sun , Qiuyu Du , Ruihang Chen , Zirun Yang , Zhiqiang Hu , Hongqi Shi
{"title":"Ni60-WC-Co double-layer coating fabricated on TC4 alloy substrate using the rapid hot pressing sintering","authors":"Xinxing Li ,&nbsp;Hu Sun ,&nbsp;Qiuyu Du ,&nbsp;Ruihang Chen ,&nbsp;Zirun Yang ,&nbsp;Zhiqiang Hu ,&nbsp;Hongqi Shi","doi":"10.1016/j.matlet.2025.138416","DOIUrl":"10.1016/j.matlet.2025.138416","url":null,"abstract":"<div><div>Ni60-WC-Co double-layer coating was successfully prepared on TC4 alloy substrate using the rapid hot-press sintering method. The WC-Co coating primarily consists of WC and Co phases, with a small amount of W<sub>2</sub>C phase. The Ni60 interlayer is mainly composed of four phases: FeNi<sub>3</sub>, Cr<sub>7</sub>C<sub>3</sub>, CrB and Cr<sub>2</sub>B. A diffusion layer of approximately 500 μm was formed between the Ni60 interlayer and the TC4 substrate. The Ni60 interlayer significantly improved the interfacial bonding between the WC-Co coating and the TC4 substrate. Dense interfaces were formed between the TC4 substrate, the diffusion layer, the Ni60 interlayer, and the WC-Co coating, with no micro-porosity or cracks observed. Compared to the TC4 substrate, the microhardness and wear resistance of the coating were increased by 3.42 times and 12.12 times, respectively.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"390 ","pages":"Article 138416"},"PeriodicalIF":2.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Reusability and long-life storage SERS substrate based on epitaxial transition metal nitride films with a nanoisland-like surface
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-17 DOI: 10.1016/j.matlet.2025.138414
Shaoqin Peng , Xinwei Wang , Ruyi Zhang , Minghua Tang
{"title":"Reusability and long-life storage SERS substrate based on epitaxial transition metal nitride films with a nanoisland-like surface","authors":"Shaoqin Peng ,&nbsp;Xinwei Wang ,&nbsp;Ruyi Zhang ,&nbsp;Minghua Tang","doi":"10.1016/j.matlet.2025.138414","DOIUrl":"10.1016/j.matlet.2025.138414","url":null,"abstract":"<div><div>Nanostructures (e.g., nanogroove and nanocavity) composed of high crystalline-quality transition metal nitrides (TMN) have great potential for application in stable and reusable Surface-Enhanced Raman scattering (SERS) substrates. However, their development is hindered by the complex multi-step preparation method. Here, to easily obtain reusable SERS substrates with high crystalline quality, epitaxial and fully relaxed Nb<sub>0.5</sub>Ti<sub>0.5</sub>N (NbTiN) films with a nanoisland-like surface were deposited on a YAlO<sub>3</sub> (YAO) substrate with a large lattice mismatch (∼ −17.46 %) in one-step. The limit of detection (LOD) of NbTiN SERS substrates is 10<sup>-7</sup> mol/L, with an enhancement factor (EF) of 3.2 × 10<sup>4</sup> (for Rhodamine 6G). Remarkably, NbTiN SERS substrates exhibit a storage lifespan of over 6 months and recyclability for more than 5 cycles with two different target molecules. Finite-difference time-domain simulations (FDTD) show that the SERS performance of NbTiN/YAO films benefits from the local electric field enhancement generated by the nanoisland-like surface. Therefore, we present a facile approach to obtaining reusable SERS substrates with long-term storage for practical applications.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"390 ","pages":"Article 138414"},"PeriodicalIF":2.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Estimation of band gap energy and detection of electronic transitions in UV–visible spectrum of Co4Nb2O9
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-17 DOI: 10.1016/j.matlet.2025.138409
Parthasarathi Mohanty, Sunita Keshri
{"title":"Estimation of band gap energy and detection of electronic transitions in UV–visible spectrum of Co4Nb2O9","authors":"Parthasarathi Mohanty,&nbsp;Sunita Keshri","doi":"10.1016/j.matlet.2025.138409","DOIUrl":"10.1016/j.matlet.2025.138409","url":null,"abstract":"<div><div>Evaluation of optical band gap and detection of various optoelectronic transitions in the absorption spectra of <span><math><mrow><msub><mrow><mi>C</mi><mi>o</mi></mrow><mn>4</mn></msub><msub><mrow><mi>N</mi><mi>b</mi></mrow><mn>2</mn></msub><msub><mi>O</mi><mn>9</mn></msub></mrow></math></span> are the primary objectives of this article. Phase purity and crystallinity were checked using X-ray diffraction and Raman spectroscopy. The optical absorption study was conducted using UV–visible spectrum and the possible absorption maxima were described by density functional theory. Using the Tauc model the band gap is found to be 1.78 eV for direct allowed transition, and it is in good agreement with the <em>ab initio</em> band gap value. A combined study of absorption spectra and density of states shows seven major possible transitions comprising both metal–oxygen p-d transitions and metal–metal d-d transitions.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"390 ","pages":"Article 138409"},"PeriodicalIF":2.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Tailoring oxygen vacancies in CoSX-LDH electrocatalysts to boost bifunctional water splitting performance
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-17 DOI: 10.1016/j.matlet.2025.138412
José Béjar , Juan Pablo F. Rebolledo-Chávez , Lillian G. Ramírez-Palma , Juan Manuel Olivares Ramírez , Anabel D. Delgado , Alfredo Aguilar Elguezabal , Noé Arjona , Lorena Álvarez–Contreras
{"title":"Tailoring oxygen vacancies in CoSX-LDH electrocatalysts to boost bifunctional water splitting performance","authors":"José Béjar ,&nbsp;Juan Pablo F. Rebolledo-Chávez ,&nbsp;Lillian G. Ramírez-Palma ,&nbsp;Juan Manuel Olivares Ramírez ,&nbsp;Anabel D. Delgado ,&nbsp;Alfredo Aguilar Elguezabal ,&nbsp;Noé Arjona ,&nbsp;Lorena Álvarez–Contreras","doi":"10.1016/j.matlet.2025.138412","DOIUrl":"10.1016/j.matlet.2025.138412","url":null,"abstract":"<div><div>In this work, a straightforward synthesis method to obtain defect-engineered ZIF-derived bifunctional electrocatalysts designed for HER and OER applications is reported. The catalysts, based on CoS<sub>x</sub> or NiCoS<sub>x</sub> in heterojunction with NiFe-LDH, display notable enhancements in catalytic performance due to oxygen vacancies. The defect-rich NiCoS<sub>x</sub>-LDH OV catalyst achieved an impressive OER overpotential of 310 mV and a low Tafel slope of 21 mV/dec. For HER, NiCoS<sub>x</sub>-LDH OV exhibited an onset potential of −0.180 V <em>vs</em> RHE with a Tafel slope of 130 mV/dec, and an overall bifunctional capability of ΔE at 50 mA cm<sup>−2</sup> of 1.90 V. Stability tests demonstrated excellent catalytic durability, maintaining consistent current densities over 24 h.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"390 ","pages":"Article 138412"},"PeriodicalIF":2.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Design, optimization and performance Evaluation of a fully automatic electrochemical disc electrode polishing robot
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-16 DOI: 10.1016/j.matlet.2025.138410
Huiyuan Bi , Tao He , Hongxia Shen , Liqiu Zhang , Lichun Liu , Chuan-Ying Li
{"title":"Design, optimization and performance Evaluation of a fully automatic electrochemical disc electrode polishing robot","authors":"Huiyuan Bi ,&nbsp;Tao He ,&nbsp;Hongxia Shen ,&nbsp;Liqiu Zhang ,&nbsp;Lichun Liu ,&nbsp;Chuan-Ying Li","doi":"10.1016/j.matlet.2025.138410","DOIUrl":"10.1016/j.matlet.2025.138410","url":null,"abstract":"<div><div>In this study, a fully automatic electrochemical disc electrode polishing robot was designed and verified. The aim was to improve the efficiency and consistency of electrode polishing in electrochemical experiments. Through mechanical design, 3D modeling, intelligent control, and parameter optimization, the electrode surface state was restored. This system uses the CoreXY motion structure and self-designed polishing and rinsing modules, controlled by an ESP32 single-chip microcomputer. After optimizing factors like polishing powder size, pressure, revolutions, speed, and polishing cloth, optimal conditions were determined. Cyclic voltammetry (CV) tests on various electrodes verified the robot’s applicability and reliability. The results showed that the polishing robot’s performance could match or exceed traditional manual polishing, laying a foundation for electrochemical experiment automation.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"390 ","pages":"Article 138410"},"PeriodicalIF":2.7,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143643419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Tribological performance evaluation of CrAlN-Ag and CrAlN/CrAlN-Ag coatings
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-15 DOI: 10.1016/j.matlet.2025.138403
He Lu, Yuhou Wu, Zijin Liu, He Wang, Tongxiang Zheng, Jiancheng Guo
{"title":"Tribological performance evaluation of CrAlN-Ag and CrAlN/CrAlN-Ag coatings","authors":"He Lu,&nbsp;Yuhou Wu,&nbsp;Zijin Liu,&nbsp;He Wang,&nbsp;Tongxiang Zheng,&nbsp;Jiancheng Guo","doi":"10.1016/j.matlet.2025.138403","DOIUrl":"10.1016/j.matlet.2025.138403","url":null,"abstract":"<div><div>This study explores methods to enhance the performance of silicon nitride (Si<sub>3</sub>N<sub>4</sub>) bearings under oil-free lubrication by examining the tribological behavior of Ag-doped CrAlN coatings under varying loads. CrAlN-Ag and CrAlN/CrAlN-Ag coatings were deposited on Si<sub>3</sub>N<sub>4</sub> substrates using radio frequency magnetron sputtering. The coatings were characterized using scanning electron microscopy (SEM) and X-ray diffraction (XRD), while their mechanical properties were assessed through nanoindentation tests. Tribological performance was evaluated under different load conditions, and finite element analysis was employed to investigate the contact stress distribution within the coatings. The results reveal that Ag migrates toward the coating surface within a depth of approximately 250 nm, forming discrete Ag phases both internally and on the surface. Although Ag doping leads to a reduction in mechanical strength, the CrAlN/CrAlN-Ag coating demonstrates superior tribological performance under high loads. Furthermore, as the Ag concentration increases, the coating’s wear mechanism progressively transitions from abrasive wear to lubricated wear and, ultimately, to spalling wear.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"389 ","pages":"Article 138403"},"PeriodicalIF":2.7,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
3D hierarchically porous carbon derived from asphalt via salt template strategy for high-performance aqueous zinc-sulfur batteries
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-15 DOI: 10.1016/j.matlet.2025.138406
Tongtong Zheng , Zhiman Bai , Kun Tang , Mingzai Wu
{"title":"3D hierarchically porous carbon derived from asphalt via salt template strategy for high-performance aqueous zinc-sulfur batteries","authors":"Tongtong Zheng ,&nbsp;Zhiman Bai ,&nbsp;Kun Tang ,&nbsp;Mingzai Wu","doi":"10.1016/j.matlet.2025.138406","DOIUrl":"10.1016/j.matlet.2025.138406","url":null,"abstract":"<div><div>Conductive carbon materials have great potential as sulfur host for zinc-sulfur batteries, and their microstructures have a significant impact on the electrochemical activity. Herein, conductive carbon materials with different microstructures were synthesized from asphalt through a two-step annealing procedure using potassium citrate and sodium chloride as the templates. Among these materials, three-dimensional hierarchically porous carbon (3DPC) offers superior ionic and electronic conductivity for zinc-sulfur batteries due to its unique microstructure. The zinc-sulfur battery using S@3DPC as the cathode exhibits lower polarization (1.13 V) and excellent rate performance (582.2mAh g<sup>−1</sup> at 5.0 A g<sup>−1</sup>). A high discharged capacity of 322.4mAh g<sup>−1</sup> can still be maintained even after 500 cycles at 5 A g<sup>−1</sup>.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"389 ","pages":"Article 138406"},"PeriodicalIF":2.7,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143643970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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