We developed a hybrid electrocatalyst of polyaniline (PANI), reduced graphene oxide (rGO), and transition metal dichalcogenides (TMDs) embedded in a NiMoP matrix via electroless plating. This architecture enhances charge carrier mobility, facilitates ion transport, and increases active site exposure, while NiMoP ensures stability. The rGO-PANI-TMD heterostructure lowers kinetic barriers and accelerates charge transfer. The optimized catalyst achieved excellent alkaline HER performance (η10 = 90.1 mV, b = 91 mVdec−1), high exchange current density, and durability, offering a scalable, cost-effective route to robust electrocatalysts for efficient hydrogen production.
我们开发了一种由聚苯胺（PANI）、还原氧化石墨烯（rGO）和过渡金属二硫族化合物（TMDs）通过化学镀嵌入NiMoP基体的杂化电催化剂。这种结构增强了电荷载流子迁移率，促进了离子传输，增加了活性位点暴露，而NiMoP则确保了稳定性。rGO-PANI-TMD异质结构降低了动力学势垒，加速了电荷转移。优化后的催化剂具有优异的碱性HER性能（η10 = 90.1 mV, b = 91 mVdec−1）、高交换电流密度和耐用性，为高效制氢提供了一种可扩展、经济高效的电催化剂途径。
{"title":"Strategic tuning of multi-component NiMoP/TMD-rGO-PANI catalysts for efficient alkaline hydrogen evolution reaction","authors":"Rijith Sreenivasan , Sarika Sasidharan , Aswathy Retnakaran Sugandhi , Abhilash Sudhakaran , Antony Bruz , Sumi Vijayakumari Sasidharan Nair","doi":"10.1016/j.matlet.2026.140180","DOIUrl":"10.1016/j.matlet.2026.140180","url":null,"abstract":"<div><div>We developed a hybrid electrocatalyst of polyaniline (PANI), reduced graphene oxide (rGO), and transition metal dichalcogenides (TMDs) embedded in a NiMoP matrix via electroless plating. This architecture enhances charge carrier mobility, facilitates ion transport, and increases active site exposure, while NiMoP ensures stability. The rGO-PANI-TMD heterostructure lowers kinetic barriers and accelerates charge transfer. The optimized catalyst achieved excellent alkaline HER performance (η<sub>10</sub> = 90.1 mV, b = 91 mVdec<sup>−1</sup>), high exchange current density, and durability, offering a scalable, cost-effective route to robust electrocatalysts for efficient hydrogen production.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"409 ","pages":"Article 140180"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171495","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}
Pub Date : 2026-04-15Epub Date: 2026-02-05DOI: 10.1016/j.matlet.2026.140200
Jonathan Elias Rodrigues Martins , David da Silva Braz , Amanda Batista Nascimento , Paulo Elesson Guimarães de Oliveira , Denner Silvino da Silva , José Ednésio da Cruz Freire , Francisco Carlos Carneiro Soares Salomão , Marilia de Albuquerque Oliveira , Carlúcio Roberto Alves , Márjory Lima Holanda Araújo , Felipe Pantoja Mesquita , Jannison Karlly Cavalcante Ribeiro , Pedro Everson Alexandre de Aquino , Luciana Maria de Barros Carlos , Francisca Vânia Barreto Aguiar Ferreira Gomes , Luany Elvira Mesquita Carvalho , Vânia Marilande Ceccatto
Impaired wound healing, particularly under diabetic conditions, demands biomaterials capable of providing structural stability and biological support. In this study, a bioactive iota/kappa-carrageenan hydrogel membrane was fabricated by extrusion-based 3D printing and evaluated in excisional wound models in healthy and diabetic mice. The printed membrane, incorporating proline, hydroxyproline, α-bisabolol, peptides, and zinc sulfate (1% w/v each), exhibited sustained zero-order release kinetics (Y = 0.0163× + 1.336) and reduced water absorption compared with polymeric controls (p < 0.05). Atomic force microscopy revealed increased surface roughness (62.74 nm versus 51.64 nm), indicating polymer reorganization. In vivo, the bioactive membrane significantly accelerated wound contraction, increased collagen deposition, and enhanced fibroblast density in healthy animals (p < 0.05). In diabetic wounds, treatment improved collagen organization and significantly increased VEGF and FGF2 expression, indicating enhanced angiogenesis and fibroplasia. These results demonstrate that the 3D-printed carrageenan membrane provides a stable and biologically active platform for wound repair.
{"title":"Evaluation of the healing potential of a 3D biomembrane with carrageenan matrix in an excisional wound model","authors":"Jonathan Elias Rodrigues Martins , David da Silva Braz , Amanda Batista Nascimento , Paulo Elesson Guimarães de Oliveira , Denner Silvino da Silva , José Ednésio da Cruz Freire , Francisco Carlos Carneiro Soares Salomão , Marilia de Albuquerque Oliveira , Carlúcio Roberto Alves , Márjory Lima Holanda Araújo , Felipe Pantoja Mesquita , Jannison Karlly Cavalcante Ribeiro , Pedro Everson Alexandre de Aquino , Luciana Maria de Barros Carlos , Francisca Vânia Barreto Aguiar Ferreira Gomes , Luany Elvira Mesquita Carvalho , Vânia Marilande Ceccatto","doi":"10.1016/j.matlet.2026.140200","DOIUrl":"10.1016/j.matlet.2026.140200","url":null,"abstract":"<div><div>Impaired wound healing, particularly under diabetic conditions, demands biomaterials capable of providing structural stability and biological support. In this study, a bioactive iota/kappa-carrageenan hydrogel membrane was fabricated by extrusion-based 3D printing and evaluated in excisional wound models in healthy and diabetic mice. The printed membrane, incorporating proline, hydroxyproline, α-bisabolol, peptides, and zinc sulfate (1% <em>w</em>/<em>v</em> each), exhibited sustained zero-order release kinetics (Y = 0.0163× + 1.336) and reduced water absorption compared with polymeric controls (<em>p</em> < 0.05). Atomic force microscopy revealed increased surface roughness (62.74 nm versus 51.64 nm), indicating polymer reorganization. In vivo, the bioactive membrane significantly accelerated wound contraction, increased collagen deposition, and enhanced fibroblast density in healthy animals (<em>p</em> < 0.05). In diabetic wounds, treatment improved collagen organization and significantly increased VEGF and FGF2 expression, indicating enhanced angiogenesis and fibroplasia. These results demonstrate that the 3D-printed carrageenan membrane provides a stable and biologically active platform for wound repair.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"409 ","pages":"Article 140200"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171499","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}
Gold nanoparticles (Au-NPs) were synthesized by pulsed laser ablation in liquids for their application in surface-enhanced Raman spectroscopy (SERS) detection of methylene blue (MB). A Nd:YAG laser was employed to ablate a gold target immersed methanol, ethanol, acetone, or isopropanol. UV–Vis spectroscopy revealed solvent-dependent shifts of the localized surface plasmon resonance (LSPR).
Au-NPs obtained in isopropanol showed the most intense plasmonic response and strongest Raman enhancement, enabling clear identification of MB vibrational modes. The results highlight how solvent polarity and dielectric constant influence nanoparticles aggregation, morphology, and plasmonic coupling, offering a clean and controllable route to design SERS-active nanostructures.
{"title":"Solvent-dependent Plasmonic response of laser-ablated gold nanoparticles for SERS detection of methylene blue","authors":"Omar Gaspar-Ramírez , Jesús Cervantes-Martínez , L.P. Rivera , J.G. Quiñones-Galván","doi":"10.1016/j.matlet.2026.140214","DOIUrl":"10.1016/j.matlet.2026.140214","url":null,"abstract":"<div><div>Gold nanoparticles (Au-NPs) were synthesized by pulsed laser ablation in liquids for their application in surface-enhanced Raman spectroscopy (SERS) detection of methylene blue (MB). A Nd:YAG laser was employed to ablate a gold target immersed methanol, ethanol, acetone, or isopropanol. UV–Vis spectroscopy revealed solvent-dependent shifts of the localized surface plasmon resonance (LSPR).</div><div>Au-NPs obtained in isopropanol showed the most intense plasmonic response and strongest Raman enhancement, enabling clear identification of MB vibrational modes. The results highlight how solvent polarity and dielectric constant influence nanoparticles aggregation, morphology, and plasmonic coupling, offering a clean and controllable route to design SERS-active nanostructures.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"409 ","pages":"Article 140214"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171603","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}
Pub Date : 2026-04-15Epub Date: 2026-02-08DOI: 10.1016/j.matlet.2026.140235
Fei Meng, Hongrun Luo, Ruixue Sun
A novel multi-functional composite coating with micro-arc oxidation (MAO) coating as the inner layer, polycaprolactone (PCL) coating doped with polydopamine (PDA) modified MXene (MXene@PDA) as the outer layer was successfully prepared on AZ31B alloy. The few-layer Ti3C2Tx MXene can be uniformly and stably dispersed in PCL layer after modification with PDA. Compared with the AZ31B alloy, the MAO-PCL/MXene@PDA composite coating exhibited an increase of three orders of magnitude in charge-transfer resistance (Rct) and demonstrated self-healing performance driven by near-infrared (NIR) irradiation. The addition of MXene@PDA particles can endow the composite coating with good photothermal antibacterial performance with 92.5% and 95.8% efficacy against E. coli and S. aureus, respectively. Moreover, the cellular experiments confirmed the low cytotoxicity of the composite coating and its great capacity for promoting cell proliferation as well as osteogenic differentiation.
{"title":"Design of polycaprolactone/MXene@PDA composite coating on MAO-treated magnesium alloy for enhanced photothermal antimicrobial property","authors":"Fei Meng, Hongrun Luo, Ruixue Sun","doi":"10.1016/j.matlet.2026.140235","DOIUrl":"10.1016/j.matlet.2026.140235","url":null,"abstract":"<div><div>A novel multi-functional composite coating with micro-arc oxidation (MAO) coating as the inner layer, polycaprolactone (PCL) coating doped with polydopamine (PDA) modified MXene (MXene@PDA) as the outer layer was successfully prepared on AZ31B alloy. The few-layer Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene can be uniformly and stably dispersed in PCL layer after modification with PDA. Compared with the AZ31B alloy, the MAO-PCL/MXene@PDA composite coating exhibited an increase of three orders of magnitude in charge-transfer resistance (<em>R</em><sub><em>ct</em></sub>) and demonstrated self-healing performance driven by near-infrared (NIR) irradiation. The addition of MXene@PDA particles can endow the composite coating with good photothermal antibacterial performance with 92.5% and 95.8% efficacy against <em>E. coli</em> and <em>S. aureus</em>, respectively. Moreover, the cellular experiments confirmed the low cytotoxicity of the composite coating and its great capacity for promoting cell proliferation as well as osteogenic differentiation.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"409 ","pages":"Article 140235"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171579","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}
Bovine-derived bone graft materials are widely used for localized bone defect treatment, yet direct comparisons of different processing forms remain limited. In this study, bovine cancellous bone (BBC), demineralized bone matrix cancellous (DBMC), and bovine-derived hydroxyapatite (HAp) were prepared from the same source in standardized cube form and comparatively evaluated. BBC retained a natural trabecular architecture with large interconnected pores and exhibited the highest compressive strength (13.27 ± 8.13 MPa). DBMC showed a collagen-rich, amorphous structure with high swelling capacity but markedly reduced mechanical strength (1.49 ± 0.79 MPa). HAp demonstrated high crystallinity, low swelling, and brittle mechanical behavior with low compressive strength (1.22 ± 0.68 MPa). All materials exhibited high cell viability (>90%). These findings reveal clear structure–property relationships among bovine-derived grafts and support informed material selection for localized bone defect applications.
{"title":"Structure and property comparison of bovine cancellous bone, demineralized bone matrix, and hydroxyapatite for localized bone graft applications","authors":"Octarina , Florencia Livia Kurniawan , Niko Falatehan , Karen Sofiana , Astri Rinanti , Meircurius Dwi Condro Surboyo","doi":"10.1016/j.matlet.2026.140230","DOIUrl":"10.1016/j.matlet.2026.140230","url":null,"abstract":"<div><div>Bovine-derived bone graft materials are widely used for localized bone defect treatment, yet direct comparisons of different processing forms remain limited. In this study, bovine cancellous bone (BBC), demineralized bone matrix cancellous (DBMC), and bovine-derived hydroxyapatite (HAp) were prepared from the same source in standardized cube form and comparatively evaluated. BBC retained a natural trabecular architecture with large interconnected pores and exhibited the highest compressive strength (13.27 ± 8.13 MPa). DBMC showed a collagen-rich, amorphous structure with high swelling capacity but markedly reduced mechanical strength (1.49 ± 0.79 MPa). HAp demonstrated high crystallinity, low swelling, and brittle mechanical behavior with low compressive strength (1.22 ± 0.68 MPa). All materials exhibited high cell viability (>90%). These findings reveal clear structure–property relationships among bovine-derived grafts and support informed material selection for localized bone defect applications.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"409 ","pages":"Article 140230"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171583","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}
PVA/MgCl2 electrolytes with 5 wt% BTO show enhanced structural and electrochemical properties. FTIR and UV–Vis confirm BTO incorporation, bandgap reduction, and stronger polymer–ceramic interactions. SEM and XRD reveal porous morphologies, lower polymer crystallinity, and preserved BTO structure. EIS indicates increased ionic conductivity (10−4 → 6 × 10−3 S cm−1) and reduced activation energy (0.23 → 0.15 eV). LSV, impedance, and DC polarization analyses show improved oxidative stability, lower interfacial resistance, and higher Mg2+ mobility. Symmetric Mg|PE|Mg cycling demonstrates more uniform Mg deposition/stripping, highlighting the potential of 5 wt% BTO-doped electrolytes for magnesium batteries.
添加5 wt% BTO的PVA/MgCl2电解质具有增强的结构和电化学性能。FTIR和UV-Vis证实了BTO的掺入，带隙减小和更强的聚合物陶瓷相互作用。SEM和XRD显示多孔形态，较低的聚合物结晶度和保留的BTO结构。EIS表明离子电导率增加（10−4→6 × 10−3 S cm−1），活化能降低（0.23→0.15 eV）。LSV，阻抗和直流极化分析表明，氧化稳定性提高，界面电阻降低，Mg2+迁移率提高。对称Mg|PE|Mg循环显示更均匀的Mg沉积/剥离，突出了5wt % bto掺杂电解质用于镁电池的潜力。
{"title":"Synergistic enhancement of ionic transport and interfacial stability in PVA-MgCl2 electrolytes via BaTiO3 nanofiller integration for magnesium-ion batteries","authors":"Rania Gamal , Abdel-Menem Elnemr , Mostafa.A. Moselhy , Reda Khalil , Eslam Sheha","doi":"10.1016/j.matlet.2026.140167","DOIUrl":"10.1016/j.matlet.2026.140167","url":null,"abstract":"<div><div>PVA/MgCl<sub>2</sub> electrolytes with 5 wt% BTO show enhanced structural and electrochemical properties. FTIR and UV–Vis confirm BTO incorporation, bandgap reduction, and stronger polymer–ceramic interactions. SEM and XRD reveal porous morphologies, lower polymer crystallinity, and preserved BTO structure. EIS indicates increased ionic conductivity (10<sup>−4</sup> → 6 × 10<sup>−3</sup> S cm<sup>−1</sup>) and reduced activation energy (0.23 → 0.15 eV). LSV, impedance, and DC polarization analyses show improved oxidative stability, lower interfacial resistance, and higher Mg<sup>2+</sup> mobility. Symmetric Mg|PE|Mg cycling demonstrates more uniform Mg deposition/stripping, highlighting the potential of 5 wt% BTO-doped electrolytes for magnesium batteries.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"409 ","pages":"Article 140167"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146076736","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}
Pub Date : 2026-04-15Epub Date: 2026-01-27DOI: 10.1016/j.matlet.2026.140160
Hong Ji , Kexin Hao , Mengye Zhang , Ke Yang , Zhixiang Xing
Through a stepwise impregnation-coating strategy, acetylated lignin (AL), modified porous corn starch (MPCS), hydrophobic silica (SiO2), and titanium disulfide (WS₂) nanoparticles were integrated into a polyurethane (PU) matrix to prepare multifunctional PU@WS2-SiO2@PDMS composites. The resulting sponge exhibits stable high hydrophobicity/oleophobicity with a water contact angle (WCA) of 153°. It demonstrates remarkable adsorption capacity (>24 g/g for both diesel and soybean oil), retaining approximately 18 g/g adsorption capacity after 20 cycles while maintaining stable mechanical properties. This material combines outstanding oil-water separation performance with reusability. Thermogravimetric analysis (TGA) indicates the modified sponge retains 4.8 times the residual mass of the original sponge. Furthermore, the WS₂-induced photothermal enhancement effect reduces crude oil adsorption time under illumination from 636 s to 152 s. these combined properties highlight the application potential of PU@WS2-SiO2@PDMS sponge as a highly efficient, resilient material for oil spill remediation and organic pollutant management
{"title":"Multifunctional PU@WS2-SiO2@PDMS sponge oil spill remediation and flame retardancy","authors":"Hong Ji , Kexin Hao , Mengye Zhang , Ke Yang , Zhixiang Xing","doi":"10.1016/j.matlet.2026.140160","DOIUrl":"10.1016/j.matlet.2026.140160","url":null,"abstract":"<div><div>Through a stepwise impregnation-coating strategy, acetylated lignin (AL), modified porous corn starch (MPCS), hydrophobic silica (SiO<sub>2</sub>), and titanium disulfide (WS₂) nanoparticles were integrated into a polyurethane (PU) matrix to prepare multifunctional PU@WS<sub>2</sub>-SiO<sub>2</sub>@PDMS composites. The resulting sponge exhibits stable high hydrophobicity/oleophobicity with a water contact angle (WCA) of 153°. It demonstrates remarkable adsorption capacity (>24 g/g for both diesel and soybean oil), retaining approximately 18 g/g adsorption capacity after 20 cycles while maintaining stable mechanical properties. This material combines outstanding oil-water separation performance with reusability. Thermogravimetric analysis (TGA) indicates the modified sponge retains 4.8 times the residual mass of the original sponge. Furthermore, the WS₂-induced photothermal enhancement effect reduces crude oil adsorption time under illumination from 636 s to 152 s. these combined properties highlight the application potential of PU@WS<sub>2</sub>-SiO<sub>2</sub>@PDMS sponge as a highly efficient, resilient material for oil spill remediation and organic pollutant management</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"409 ","pages":"Article 140160"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171509","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}
Pub Date : 2026-04-15Epub Date: 2026-02-05DOI: 10.1016/j.matlet.2026.140221
Yingmei Zhou , Ran Jin , Huiying Zhang , Zhengnan Wei , Wendan Xue , Xun Cui
The sluggish kinetics of the oxygen reduction reaction (ORR) limits the performance of fuel cells and metal-air batteries, while Pt-based catalysts suffer from high cost and poor durability. Herein, a controllable pyrolysis-free strategy is developed to construct a conjugated coordination polymer with well-defined CoN4 sites on graphene oxide (CCP-CoN4/GO). Strong electronic coupling between the conjugated coordination framework and the GO substrate facilitates electron transfer and optimizes the electronic structure of Co active centers, leading to high ORR activity and durability in alkaline media. The CCP-CoN4/GO delivers an onset potential of 0.96 V and a half-wave potential of 0.85 V. When applied as the cathode in zinc-air batteries, it exhibits high power density and excellent cycling stability, demonstrating strong potential for efficient energy conversion devices.
{"title":"Pyrolysis-free cobalt-based conjugated coordination polymer/graphene oxide hybrid for efficient oxygen reduction","authors":"Yingmei Zhou , Ran Jin , Huiying Zhang , Zhengnan Wei , Wendan Xue , Xun Cui","doi":"10.1016/j.matlet.2026.140221","DOIUrl":"10.1016/j.matlet.2026.140221","url":null,"abstract":"<div><div>The sluggish kinetics of the oxygen reduction reaction (ORR) limits the performance of fuel cells and metal-air batteries, while Pt-based catalysts suffer from high cost and poor durability. Herein, a controllable pyrolysis-free strategy is developed to construct a conjugated coordination polymer with well-defined Co<img>N<sub>4</sub> sites on graphene oxide (CCP-CoN<sub>4</sub>/GO). Strong electronic coupling between the conjugated coordination framework and the GO substrate facilitates electron transfer and optimizes the electronic structure of Co active centers, leading to high ORR activity and durability in alkaline media. The CCP-CoN<sub>4</sub>/GO delivers an onset potential of 0.96 V and a half-wave potential of 0.85 V. When applied as the cathode in zinc-air batteries, it exhibits high power density and excellent cycling stability, demonstrating strong potential for efficient energy conversion devices.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"409 ","pages":"Article 140221"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171602","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}
Pub Date : 2026-04-15Epub Date: 2026-02-04DOI: 10.1016/j.matlet.2026.140217
Song Liu , Zhenhai Yu , Siyu Yang , Zhengfei Zhang
Layered vanadium pentoxide (V₂O₅) is considered a highly promising cathode material for aqueous zinc-ion batteries (AZIBs). However, its practical application is hindered by poor cycling stability and sluggish Zn2+ diffusion kinetics. In this study, a dual-ion Cu, Ni-doped V₂O₅ cathode material, denoted as CNVO 6–1, was successfully synthesized via a convenient one-step hydrothermal method. The incorporation of Cu2+ slightly expands the interlayer spacing, facilitating rapid Zn2+ insertion/extraction. Furthermore, the combined effect of Cu2+ and Ni2+ ions stabilizes the layered structure. The CNVO 6–1 electrode delivers a high specific capacity of 384.49 mAh g−1 at 1 A g−1, superior rate capability (119.47 mAh g−1 at 20 A g−1), and outstanding long-term cycling stability with 85.02% capacity retention after 5000 cycles at 15 A g−1.
层状五氧化二钒（V₂O₅）被认为是水锌离子电池（azib）极有前途的阴极材料。然而，循环稳定性差和Zn2+扩散动力学缓慢阻碍了其实际应用。在本研究中，通过方便的一步水热法成功合成了双离子Cu， ni掺杂V₂O₅阴极材料，记为CNVO 6-1。Cu2+的加入略微扩大了层间间距，有利于快速插入/提取Zn2+。Cu2+和Ni2+离子的共同作用使层状结构更加稳定。CNVO 6-1电极在1 a g- 1时具有384.49 mAh g- 1的高比容量，在20 a g- 1时具有119.47 mAh g- 1的优越倍率能力，并且在15 a g- 1下5000次循环后具有85.02%的长期循环稳定性。
{"title":"Dual-ion Cu, Ni-doped V₂O₅ as a high-performance cathode material for aqueous zinc-ion batteries","authors":"Song Liu , Zhenhai Yu , Siyu Yang , Zhengfei Zhang","doi":"10.1016/j.matlet.2026.140217","DOIUrl":"10.1016/j.matlet.2026.140217","url":null,"abstract":"<div><div>Layered vanadium pentoxide (<em>V</em>₂O₅) is considered a highly promising cathode material for aqueous zinc-ion batteries (AZIBs). However, its practical application is hindered by poor cycling stability and sluggish Zn<sup>2+</sup> diffusion kinetics. In this study, a dual-ion Cu, Ni-doped <em>V</em>₂O₅ cathode material, denoted as CNVO 6–1, was successfully synthesized via a convenient one-step hydrothermal method. The incorporation of Cu<sup>2+</sup> slightly expands the interlayer spacing, facilitating rapid Zn<sup>2+</sup> insertion/extraction. Furthermore, the combined effect of Cu<sup>2+</sup> and Ni<sup>2+</sup> ions stabilizes the layered structure. The CNVO 6–1 electrode delivers a high specific capacity of 384.49 mAh g<sup>−1</sup> at 1 A g<sup>−1</sup>, superior rate capability (119.47 mAh g<sup>−1</sup> at 20 A g<sup>−1</sup>), and outstanding long-term cycling stability with 85.02% capacity retention after 5000 cycles at 15 A g<sup>−1</sup>.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"409 ","pages":"Article 140217"},"PeriodicalIF":2.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171580","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}
Pub Date : 2026-04-15Epub Date: 2026-01-29DOI: 10.1016/j.matlet.2026.140163
Chengwei Yang , Yuqin Guo , Xu Jia , Xiao Li
A novel fluorescence sensing platform was developed for the ultrasensitive detection of chloramphenicol (CAP) using aptamer-functionalized Fe3O4@Au nanoparticles. Under optimized conditions, the assay demonstrated a wide linear range from 1 pM to 1 μM with an exceptionally low detection limit of 0.3 pM, high specificity against structural analogs, and remarkable reproducibility. The method was successfully applied to milk, honey, and fish samples, achieving recoveries of 91.4–109.0% with RSDs ≤6.8%, highlighting its strong anti-interference capacity and practicality. This work offers a robust, reliable, and highly sensitive approach for monitoring trace CAP in food safety applications.
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