Soft responsive surfaces have generated significant interest due to their dynamic control over wetting behaviors through geometrical reorganization in response to external stimuli. Here, magnetoactive elastomeric surfaces are 3D printed using the direct ink writing technology. By designing a “high-wall” structure, superhydrophobic ability is achieved, with water contact angle of 152° and a sliding angle of 9°. The mechanical softness of the elastomer allows for reversible geometrical changes under magnetic field. This deformation can be precisely controlled by adjusting the strength and position of the magnet, causing the water droplet to move towards the desired location with a speed of 3.33 mm/s. This study introduces a new strategy for achieving lossless transportation of μL-scale nonmagnetic droplets, which holds potential for applications in microfluidics and soft robotics.
{"title":"3D printing of soft magnetoactive superhydrophobic elastomers for droplet manipulation","authors":"Xinying Li, Tianqi Pang, Ziyue Huang, Jianping Wang, Fang Huang, Liang Zhang","doi":"10.1016/j.matlet.2024.137658","DOIUrl":"10.1016/j.matlet.2024.137658","url":null,"abstract":"<div><div>Soft responsive surfaces have generated significant interest due to their dynamic control over wetting behaviors through geometrical reorganization in response to external stimuli. Here, magnetoactive elastomeric surfaces are 3D printed using the direct ink writing technology. By designing a “high-wall” structure, superhydrophobic ability is achieved, with water contact angle of 152° and a sliding angle of 9°. The mechanical softness of the elastomer allows for reversible geometrical changes under magnetic field. This deformation can be precisely controlled by adjusting the strength and position of the magnet, causing the water droplet to move towards the desired location with a speed of 3.33 mm/s. This study introduces a new strategy for achieving lossless transportation of μL-scale nonmagnetic droplets, which holds potential for applications in microfluidics and soft robotics.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137658"},"PeriodicalIF":2.7,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656614","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}
To increase the photocatalytic activity of nanocomposite based on TiO2 and rGO (NC) and improve its photosensitivity in the visible region of the spectrum, the influence of CdS concentration (1 to 10 wt% with respect to NC) on its physicochemical and photocatalytic properties was studied. The addition of CdS to NC leads to a significant increase in the photocatalytic activity. An almost fivefold increase in photocurrent compared to pure NC was registered for NC/CdS_5%. Data on Methylene blue photodegradation showed that after 210 min of irradiation, only 5 % of dye molecules remained in solution. This value is 14.4 and 11.6 times higher than that of pure NC or CdS, respectively. Enhanced photocatalytic activity is related both to the improvement of NC absorption in the region of 400–800 nm and the decrease of the band gap width of NC upon addition of CdS, as well as the significant change in the electrophysical characteristics of the nanocomposite.
{"title":"Enhanced photocatalytic properties of TiO2/rGO nanocomposites Doped with CdS","authors":"Evgeniya Seliverstova , Timur Serikov , Aigul Sadykova , Niyazbek Ibrayev , Nurxat Nuraje","doi":"10.1016/j.matlet.2024.137660","DOIUrl":"10.1016/j.matlet.2024.137660","url":null,"abstract":"<div><div>To increase the photocatalytic activity of nanocomposite based on TiO<sub>2</sub> and rGO (NC) and improve its photosensitivity in the visible region of the spectrum, the influence of CdS concentration (1 to 10 wt% with respect to NC) on its physicochemical and photocatalytic properties was studied. The addition of CdS to NC leads to a significant increase in the photocatalytic activity. An almost fivefold increase in photocurrent compared to pure NC was registered for NC/CdS_5%. Data on Methylene blue photodegradation showed that after 210 min of irradiation, only 5 % of dye molecules remained in solution. This value is 14.4 and 11.6 times higher than that of pure NC or CdS, respectively. Enhanced photocatalytic activity is related both to the improvement of NC absorption in the region of 400–800 nm and the decrease of the band gap width of NC upon addition of CdS, as well as the significant change in the electrophysical characteristics of the nanocomposite.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137660"},"PeriodicalIF":2.7,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656530","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}
In this study, we synthesized cerium oxide nanoparticles (CeO2 NPs) using Plectranthus barbatus leaf extract. Characterization via X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and UV–visible spectroscopy revealed a bandgap of 2.98 eV. XRD confirmed their crystalline nature, while HRTEM showed cubic fluorite structures with an average particle size of 11.23 nm. The CeO2 NPs exhibited antibacterial properties against both gram-positive and gram-negative bacteria and high sensitivity to carbon monoxide (CO) at 100 °C, especially at low concentrations. This research highlights the low environmental impact and potential applications of CeO2 NPs in gas sensing and antibacterial contexts.
{"title":"Synthesis and characterization of CeO2 nanoparticles using Plectranthus barbatus leaf extract and its CO gas sensing and antimicrobial activity","authors":"Huda Imran Ahemad , Ganesh Eknath Patil , Yogesh Bhaskar Aher , Momin Shoaib Malik , Laxmi Dilip Sonawane , Manoj Annasaheb More , Abhinay Subhash Mandawade , Dnyaneshwari Yuvraj Patil , Sarika Digambar Shinde , Gotan Hiralal Jain","doi":"10.1016/j.matlet.2024.137652","DOIUrl":"10.1016/j.matlet.2024.137652","url":null,"abstract":"<div><div>In this study, we synthesized cerium oxide nanoparticles (CeO<sub>2</sub> NPs) using <em>Plectranthus barbatus</em> leaf extract. Characterization via X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and UV–visible spectroscopy revealed a bandgap of 2.98 eV. XRD confirmed their crystalline nature, while HRTEM showed cubic fluorite structures with an average particle size of 11.23 nm. The CeO<sub>2</sub> NPs exhibited antibacterial properties against both gram-positive and gram-negative bacteria and high sensitivity to carbon monoxide (CO) at 100 °C, especially at low concentrations. This research highlights the low environmental impact and potential applications of CeO<sub>2</sub> NPs in gas sensing and antibacterial contexts.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137652"},"PeriodicalIF":2.7,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656521","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 : 2024-11-04DOI: 10.1016/j.matlet.2024.137654
Zhichuan Shen , Junli Zhu , Junqiao Huang , Keying Cao , Naiguang Wang , Zhicong Shi
The design of electrolytes holds paramount importance for technology iteration of sodium metal batteries. This study introduces 1,4-Dichloro-2-iodobenzene as an electrolyte additive into the in-situ polymerization process of an gel polymer electrolyte (FS-GPE-DCIB-0.1 %) with high ionic conductivity (3.96 × 10-3 S cm−1 at 30 ℃). The Na|FS-GPE-DCIB-0.1 %|Na battery demonstrates stable cycling for over 1000 h at a current density of 0.1 mA cm−2. Even at 10C, NVP|FS-GPE-DCIB-0.1 %|Na battery can maintain a capacity retention rate of 91.6 % after undergoing 6000 cycles. This work demonstrates a promising potential for practical implementation of sodium metal battery.
{"title":"Superior gel polymer electrolyte for sodium metal battery with long-term cycling stability at elevated current density","authors":"Zhichuan Shen , Junli Zhu , Junqiao Huang , Keying Cao , Naiguang Wang , Zhicong Shi","doi":"10.1016/j.matlet.2024.137654","DOIUrl":"10.1016/j.matlet.2024.137654","url":null,"abstract":"<div><div>The design of electrolytes holds paramount importance for technology iteration of sodium metal batteries. This study introduces 1,4-Dichloro-2-iodobenzene as an electrolyte additive into the in-situ polymerization process of an gel polymer electrolyte (FS-GPE-DCIB-0.1 %) with high ionic conductivity (3.96 × 10<sup>-3</sup> S cm<sup>−1</sup> at 30 ℃). The Na|FS-GPE-DCIB-0.1 %|Na battery demonstrates stable cycling for over 1000 h at a current density of 0.1 mA cm<sup>−2</sup>. Even at 10C, NVP|FS-GPE-DCIB-0.1 %|Na battery can maintain a capacity retention rate of 91.6 % after undergoing 6000 cycles. This work demonstrates a promising potential for practical implementation of sodium metal battery.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137654"},"PeriodicalIF":2.7,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656515","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 : 2024-11-04DOI: 10.1016/j.matlet.2024.137656
Jing He, Hongye Xuan, Renwei Jing, Chao Yan, Minjie Shi
Electrochemical supercapacitors (ESCs) have great potential in many energy storage technologies because of their outstanding performance. Transition metal oxides with high theoretical specific capacity are promising for ESC electrodes, but their low utilization of capacitive active components and poor cycle stability limit their practical usage. Herein, we have prepared a novel cobalt metal cyanometallic framework (Co-CMF) and further thermally modified it to easily produce a Co3O4 positive electrode with excellent capacitive storage performance. As a result, the electrode exhibits fast, stable and reversible electrochemical performance with a high specific capacity of 241.9 C g−1 and long-term stability with as low as 0.004 % decline per cycle in the 5 M KOH aqueous electrolyte, which are confirmed by in-situ Raman investigation and electrochemical tests, further demonstrating that this modified approach provides a new idea for the development of promising high-capacity electrode materials for large-scale energy storage.
电化学超级电容器（ESC）因其卓越的性能，在许多储能技术中具有巨大的潜力。具有高理论比容量的过渡金属氧化物有望成为电调电极，但其电容活性成分利用率低、循环稳定性差，限制了其实际应用。在此，我们制备了一种新型钴金属氰金属框架（Co-CMF），并进一步对其进行热改性，从而轻松制备出具有优异电容存储性能的 Co3O4 正极。结果表明，该电极具有快速、稳定和可逆的电化学性能，比容量高达 241.9 C g-1，并且具有长期稳定性，在 5 M KOH 水性电解液中每循环衰减率低至 0.004%，这些都得到了原位拉曼研究和电化学测试的证实。
{"title":"Modified organic-template synthesis of Co3O4 as high-performance electrode with superior capacitive storage","authors":"Jing He, Hongye Xuan, Renwei Jing, Chao Yan, Minjie Shi","doi":"10.1016/j.matlet.2024.137656","DOIUrl":"10.1016/j.matlet.2024.137656","url":null,"abstract":"<div><div>Electrochemical supercapacitors (ESCs) have great potential in many energy storage technologies because of their outstanding performance. Transition metal oxides with high theoretical specific capacity are promising for ESC electrodes, but their low utilization of capacitive active components and poor cycle stability limit their practical usage. Herein, we have prepared a novel cobalt metal cyanometallic framework (Co-CMF) and further thermally modified it to easily produce a Co<sub>3</sub>O<sub>4</sub> positive electrode with excellent capacitive storage performance. As a result, the electrode exhibits fast, stable and reversible electrochemical performance with a high specific capacity of 241.9 C g<sup>−1</sup> and long-term stability with as low as 0.004 % decline per cycle in the 5 M KOH aqueous electrolyte, which are confirmed by in-situ Raman investigation and electrochemical tests, further demonstrating that this modified approach provides a new idea for the development of promising high-capacity electrode materials for large-scale energy storage.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137656"},"PeriodicalIF":2.7,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656514","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 : 2024-11-04DOI: 10.1016/j.matlet.2024.137659
Zeliang Ju , Xiujuan Tan , Xuyun Zhang , Yong Wang , Chengfeng Yin , Qingxin Kang
The development of highly active electrocatalysts for Oxygen Evolution Reactions (OER) is critical in the field of energy conversion and storage. Among potential candidates, diatomic catalysts have demonstrated the potential to outperform monoatomic counterparts, though comprehensive studies on their reaction mechanisms remain limited. In this study, a Co-Cu diatomic catalyst was computationally designed using density functional theory (DFT), and four reaction pathways involving multiple intermediates (*O, *OH, *OOH, *2OH, *O + *OH) were calculated. The results indicate that the Co-Cu diatomic catalyst exhibits superior catalytic performance on pathway II (H2O → *OH → *2OH → *OOH → O2) with an overpotential of 0.27 V, overcoming the limitations imposed by the active site of conventional anion exchange membrane (AEM) catalysts. The high catalytic activity is attributed to the synergistic interaction between the metal atoms, bypassing the high-energy barrier step typically observed in conventional pathways. In this mechanism, the Cu d-band center is close to the Fermi energy level, enhancing electron transfer, while Co provides a stable adsorption site and effectively regulates the adsorption and conversion of reaction intermediates. These findings offer new strategies for the rational synthesis of bimetallic catalysts.
{"title":"Unveiling the synergistic mechanism of Co-Cu catalysts for efficient oxygen evolution reactions","authors":"Zeliang Ju , Xiujuan Tan , Xuyun Zhang , Yong Wang , Chengfeng Yin , Qingxin Kang","doi":"10.1016/j.matlet.2024.137659","DOIUrl":"10.1016/j.matlet.2024.137659","url":null,"abstract":"<div><div>The development of highly active electrocatalysts for Oxygen Evolution Reactions (OER) is critical in the field of energy conversion and storage. Among potential candidates, diatomic catalysts have demonstrated the potential to outperform monoatomic counterparts, though comprehensive studies on their reaction mechanisms remain limited. In this study, a Co-Cu diatomic catalyst was computationally designed using density functional theory (DFT), and four reaction pathways involving multiple intermediates (*O, *OH, *OOH, *2OH, *O + *OH) were calculated. The results indicate that the Co-Cu diatomic catalyst exhibits superior catalytic performance on pathway II (H<sub>2</sub>O → *OH → *2OH → *OOH → O<sub>2</sub>) with an overpotential of 0.27 V, overcoming the limitations imposed by the active site of conventional anion exchange membrane (AEM) catalysts. The high catalytic activity is attributed to the synergistic interaction between the metal atoms, bypassing the high-energy barrier step typically observed in conventional pathways. In this mechanism, the Cu d-band center is close to the Fermi energy level, enhancing electron transfer, while Co provides a stable adsorption site and effectively regulates the adsorption and conversion of reaction intermediates. These findings offer new strategies for the rational synthesis of bimetallic catalysts.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137659"},"PeriodicalIF":2.7,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142587136","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 : 2024-11-03DOI: 10.1016/j.matlet.2024.137651
M.S. Bahrudin , A.Z. Arsad , M.N.A. Rahman , S.F. Abdullah , A.W.M. Zuhdi
This study presents a method to improve Cu(In1−xGax)Se2 (CIGS) absorber layer performance through an annealing technique that enhances the quality of as-deposited CIGS films. CIGS films were deposited on soda-lime glass substrates using RF magnetron sputtering at 300 °C, 400 °C, and 500 °C, followed by annealing at 500 °C for 30 min. By annealing, the crystal structure of the CIGS films is aligned, and surface strain is minimized. It can significantly boost the films’ crystallinity, crystallite sizes, carrier concentration, mobility, and energy gap. The highest temperatures enhanced crystallinity due to larger crystallite size, resulting in lower resistivity. The properties improvements are crucial for optimizing CIGS absorber layer performance. Complete CIGS solar cell at 300 °C yield Voc = 253 mV, Jsc = 1.78 mA/cm2, and efficiency = 0.15 %.
{"title":"Improving the crystallinity of quaternary sputtered CIGS absorber layer properties via optimized deposition and annealing temperature","authors":"M.S. Bahrudin , A.Z. Arsad , M.N.A. Rahman , S.F. Abdullah , A.W.M. Zuhdi","doi":"10.1016/j.matlet.2024.137651","DOIUrl":"10.1016/j.matlet.2024.137651","url":null,"abstract":"<div><div>This study presents a method to improve Cu(In<sub>1−x</sub>Ga<sub>x</sub>)Se<sub>2</sub> (CIGS) absorber layer performance through an annealing technique that enhances the quality of as-deposited CIGS films. CIGS films were deposited on soda-lime glass substrates using RF magnetron sputtering at 300 °C, 400 °C, and 500 °C, followed by annealing at 500 °C for 30 min. By annealing, the crystal structure of the CIGS films is aligned, and surface strain is minimized. It can significantly boost the films’ crystallinity, crystallite sizes, carrier concentration, mobility, and energy gap. The highest temperatures enhanced crystallinity due to larger crystallite size, resulting in lower resistivity. The properties improvements are crucial for optimizing CIGS absorber layer performance. Complete CIGS solar cell at 300 °C yield V<sub>oc</sub> = 253 mV, J<sub>sc</sub> = 1.78 mA/cm<sup>2</sup>, and efficiency = 0.15 %.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"378 ","pages":"Article 137651"},"PeriodicalIF":2.7,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142571421","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 : 2024-11-02DOI: 10.1016/j.matlet.2024.137648
Yihan Cui , Huijie Feng , Xiaoqiao Xie
A new family of versatile water-enhanced adhesives based on hydrophobic polymers and amphiphilic alkanoic acids has been developed. These polymer gels form responsive surface bonding upon water exposure through softening effect and/or autonomous rearrangement of alkanoic acid molecules at the interface, thereby enhancing adhesion on both hydrophilic and hydrophobic, smooth and rough surfaces under wet conditions.
{"title":"Water-enhanced polymer gel adhesive driven by interfacial solvent molecule rearrangement","authors":"Yihan Cui , Huijie Feng , Xiaoqiao Xie","doi":"10.1016/j.matlet.2024.137648","DOIUrl":"10.1016/j.matlet.2024.137648","url":null,"abstract":"<div><div>A new family of versatile water-enhanced adhesives based on hydrophobic polymers and amphiphilic alkanoic acids has been developed. These polymer gels form responsive surface bonding upon water exposure through softening effect and/or autonomous rearrangement of alkanoic acid molecules at the interface, thereby enhancing adhesion on both hydrophilic and hydrophobic, smooth and rough surfaces under wet conditions.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137648"},"PeriodicalIF":2.7,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142592911","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 : 2024-11-02DOI: 10.1016/j.matlet.2024.137650
Qian Li , Changlin Li , Shuoran Wang , Na Huang , Wenpei Wang , Xihong He , Jinjing Du , Hongzhou Ma , Yaqing Weng
Silicon monoxide (SiO) has a high theoretical capacity as an anode for lithium-ion batteries, but its poor conductivity and bulk effect can cause the capacity to plummet. The combination of SiO and other materials to form a core–shell mechanism on the surface of SiO can effectively alleviate these problems. In this work, a silicon dioxide (SiO2)/carbon (C) bilayer core–shell structure coated on SiO anode material was designed and synthesized to address the issues inherent in core–shell structures. When the temperature was 900 °C, SiO@SiO2@C exhibited an excellent reversible capacity of 2500.08 mAh·g−1 and a first coulombic efficiency of 75.92 %. After 100 charge/discharge cycles, it still retained 1298.25 mAh·g−1 of its capacity. Compared with those of pure SiO, its cycling stability and capacity retention are significantly improved, providing a new approach for anode materials in lithium-ion batteries.
{"title":"SiO2/C double-layer-coated SiO as a high-performance anode for lithium-ion batteries","authors":"Qian Li , Changlin Li , Shuoran Wang , Na Huang , Wenpei Wang , Xihong He , Jinjing Du , Hongzhou Ma , Yaqing Weng","doi":"10.1016/j.matlet.2024.137650","DOIUrl":"10.1016/j.matlet.2024.137650","url":null,"abstract":"<div><div>Silicon monoxide (SiO) has a high theoretical capacity as an anode for lithium-ion batteries, but its poor conductivity and bulk effect can cause the capacity to plummet. The combination of SiO and other materials to form a core–shell mechanism on the surface of SiO can effectively alleviate these problems. In this work, a silicon dioxide (SiO<sub>2</sub>)/carbon (C) bilayer core–shell structure coated on SiO anode material was designed and synthesized to address the issues inherent in core–shell structures. When the temperature was 900 °C, SiO@SiO<sub>2</sub>@C exhibited an excellent reversible capacity of 2500.08 mAh·g<sup>−1</sup> and a first coulombic efficiency of 75.92 %. After 100 charge/discharge cycles, it still retained 1298.25 mAh·g<sup>−1</sup> of its capacity. Compared with those of pure SiO, its cycling stability and capacity retention are significantly improved, providing a new approach for anode materials in lithium-ion batteries.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137650"},"PeriodicalIF":2.7,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656519","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}
Hexavalent chromium (Cr(VI)) is the most toxic state of chromium that can lead to serious ecological and human health consequences. This research investigated the efficacy of visible-light-active silver-doped zinc oxide (Ag-Doped ZnO) nanoparticles to remove Cr(VI) via reduction to a non-toxic state. The study was focused on determining the optimum Ag-Doped ZnO dose for Cr(VI) removal under the effect of pH, and investigating the kinetics of Cr(VI) reduction. The ZnO NPs were prepared using the co-precipitation method and doping with Ag was achieved with KOH and thermal decomposition. Cr(VI) removal was efficient at NP:Cr(VI) ratios of 50:1 and 25:1 achieving 100 % removal in 24 h and 48 h respectively. The removal process was hindered at pH below 6 and above 9 at a lower NP dose. The test for contact time, showed that 42 ± 9 % of the removal was attained in the first 6 h while most of the removal (73 ± 8 %) occurred in the first 12 h. The rate constant revealed that the reduction with Ag-Doped ZnO exhibited a pseudo-first-order kinetic rate with k values of −0.065 ± 0.01 mg/L.h−1.
{"title":"Decontamination of hexavalent chromium in aqueous systems through reduction with silver doped zinc oxide nanoparticles","authors":"Ghazala Ahmad , Dilawar Farhan Shams , Seema Anjum Khattak , Waliullah Khan , Akhtar Nadhman","doi":"10.1016/j.matlet.2024.137647","DOIUrl":"10.1016/j.matlet.2024.137647","url":null,"abstract":"<div><div>Hexavalent chromium (Cr(VI)) is the most toxic state of chromium that can lead to serious ecological and human health consequences. This research investigated the efficacy of visible-light-active silver-doped zinc oxide (Ag-Doped ZnO) nanoparticles to remove Cr(VI) via reduction to a non-toxic state. The study was focused on determining the optimum Ag-Doped ZnO dose for Cr(VI) removal under the effect of pH, and investigating the kinetics of Cr(VI) reduction. The ZnO NPs were prepared using the co-precipitation method and doping with Ag was achieved with KOH and thermal decomposition. Cr(VI) removal was efficient at NP:Cr(VI) ratios of 50:1 and 25:1 achieving 100 % removal in 24 h and 48 h respectively. The removal process was hindered at pH below 6 and above 9 at a lower NP dose. The test for contact time, showed that 42 ± 9 % of the removal was attained in the first 6 h while most of the removal (73 ± 8 %) occurred in the first 12 h. The rate constant revealed that the reduction with Ag-Doped ZnO exhibited a pseudo-first-order kinetic rate with <em>k</em> values of −0.065 ± 0.01 mg/L.h<sup>−1</sup>.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137647"},"PeriodicalIF":2.7,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142587139","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}
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