Bismuth-borate-chromium oxide glass ceramics containing small concentrations of ZrO2 nanoparticles were synthesized. The AFM images showed uneven grains with crystal stripes of size ≈30-70 nm on surface of the glass ceramic samples. The optical bandgap (Eo) was determined in the range of 2.7 – 3.5 eV, using three different methods viz., Tauc, ASF, and DASF methods. The Tanabe-Sugano diagram has revealed that the Cr3+ ions were presented in the strong crystal field with > 2.3. Photoluminescence spectra have revealed two emission bands by 2T2g(F) → 4A2g(F) (green emission) and 2Eg(F) → 4A2g(G) (red emission) transitions of Cr3+ ions. The (x, y) coordinates in the CIE diagram were shifted from green to orange region as the concentration of ZrO2 nanoparticles has increased gradually. These glass ceramics may act as active laser media or LED sources for practical applications in visible band, especially green-yellow-orange band.
{"title":"Surface topology, bandgap evaluation, and photoluminescence characteristics of Bi2O3-B2O3-Cr2O3: ZrO2 glass ceramics for visible light devices","authors":"Adepu Navalika , Linganaboina Srinivasa Rao , Tumu Venkatappa Rao , Shamima Hussain , Sujay Chakravarty","doi":"10.1016/j.mseb.2024.117781","DOIUrl":"10.1016/j.mseb.2024.117781","url":null,"abstract":"<div><div>Bismuth-borate-chromium oxide glass ceramics containing small concentrations of ZrO<sub>2</sub> nanoparticles were synthesized. The AFM images showed uneven grains with crystal stripes of size ≈30-70 nm on surface of the glass ceramic samples. The optical bandgap (<em>E<sub>o</sub></em>) was determined in the range of 2.7 – 3.5 eV, using three different methods viz., Tauc, ASF, and DASF methods. The Tanabe-Sugano diagram has revealed that the Cr<sup>3+</sup> ions were presented in the strong crystal field with <span><math><mfrac><msub><mi>D</mi><mi>q</mi></msub><mi>B</mi></mfrac></math></span> > 2.3. Photoluminescence spectra have revealed two emission bands by <sup>2</sup>T<sub>2g</sub>(F) → <sup>4</sup>A<sub>2g</sub>(F) (green emission) and <sup>2</sup>E<sub>g</sub>(F) → <sup>4</sup>A<sub>2g</sub>(G) (red emission) transitions of Cr<sup>3+</sup> ions. The (<em>x, y</em>) coordinates in the CIE diagram were shifted from green to orange region as the concentration of ZrO<sub>2</sub> nanoparticles has increased gradually. These glass ceramics may act as active laser media or LED sources for practical applications in visible band, especially green-yellow-orange band.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering B-advanced Functional Solid-state Materials","volume":"311 ","pages":"Article 117781"},"PeriodicalIF":3.9,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142571846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-11-01DOI: 10.1016/j.mseb.2024.117784
W.J. Wu, J.C. Xu, B. Hong, J. Li, Y.X. Zeng, X.L. Peng, H.W. Chen, X.Q. Wang
The different valent metal-doping is a feasible and convenient way to adjust the microstructures and electron concentration of In2O3 gas sensors. In this paper, the different valence metals (Zn2+, Sb3+, Zr4+ and Nb5+) are doped into MIL-68 (In) metal–organic frameworks (MOFs) by solvothermal method, and then In2O3 and metal-doped In2O3 microtubes are obtained by pyrolysis MIL-68 MOFs. All samples exhibit the similar microtubular structures, indicating oxygen adsorption on both inner and outer surface. The average grain size of metal-doped In2O3 microtubes decreases a little while the specific surface area increases greatly. Metal-doping greatly affects the formaldehyde gas-sensing performance, and Zn2+-doped In2O3 sensor presents the highest response value (188.56), shortest response/recovery times and excellent selectivity to formaldehyde gas at 210 ℃. Compared the microstructural and gas-sensing parameters of In2O3 sensor, the specific surface area and oxygen vacancies of metal-doped In2O3 sensors enhance the surface . Moreover, acceptor Zn2+-doping directly extracts electrons from conduction band of Zn2+-doped In2O3 sensor, which greatly increases the resistance in air and the thickness of electron deletion layer for Zn2+-doped In2O3 sensor.
{"title":"Highly-enhanced gas-sensing performance of metal-doped In2O3 microtubes from acceptor doping and double surface adsorption","authors":"W.J. Wu, J.C. Xu, B. Hong, J. Li, Y.X. Zeng, X.L. Peng, H.W. Chen, X.Q. Wang","doi":"10.1016/j.mseb.2024.117784","DOIUrl":"10.1016/j.mseb.2024.117784","url":null,"abstract":"<div><div>The different valent metal-doping is a feasible and convenient way to adjust the microstructures and electron concentration of In<sub>2</sub>O<sub>3</sub> gas sensors. In this paper, the different valence metals (Zn<sup>2+</sup>, Sb<sup>3+</sup>, Zr<sup>4+</sup> and Nb<sup>5+</sup>) are doped into MIL-68 (In) metal–organic frameworks (MOFs) by solvothermal method, and then In<sub>2</sub>O<sub>3</sub> and metal-doped In<sub>2</sub>O<sub>3</sub> microtubes are obtained by pyrolysis MIL-68 MOFs. All samples exhibit the similar microtubular structures, indicating oxygen adsorption on both inner and outer surface. The average grain size of metal-doped In<sub>2</sub>O<sub>3</sub> microtubes decreases a little while the specific surface area increases greatly. Metal-doping greatly affects the formaldehyde gas-sensing performance, and Zn<sup>2+</sup>-doped In<sub>2</sub>O<sub>3</sub> sensor presents the highest response value (188.56), shortest response/recovery times and excellent selectivity to formaldehyde gas at 210 ℃. Compared the microstructural and gas-sensing parameters of In<sub>2</sub>O<sub>3</sub> sensor, the specific surface area and oxygen vacancies of metal-doped In<sub>2</sub>O<sub>3</sub> sensors enhance the surface <span><math><msup><mrow><mi>O</mi></mrow><mo>-</mo></msup></math></span>. Moreover, acceptor Zn<sup>2+</sup>-doping directly extracts electrons from conduction band of Zn<sup>2+</sup>-doped In<sub>2</sub>O<sub>3</sub> sensor, which greatly increases the resistance in air and the thickness of electron deletion layer for Zn<sup>2+</sup>-doped In<sub>2</sub>O<sub>3</sub> sensor.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering B-advanced Functional Solid-state Materials","volume":"311 ","pages":"Article 117784"},"PeriodicalIF":3.9,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142571845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-11-01DOI: 10.1016/j.mseb.2024.117776
S. Biswas , A. Sen , D. Pramanik , N. Roy , R. Biswas , A.S Kuar
Polymers provide superior strength-to-weight ratios, malleability, cost-effectiveness, and recyclability compared to metals and alloys, rendering them highly favoured in the domains of automobile, electrical, medicinal, and thermal engineering. The present study employs a fiber laser as an approach to generate Gaussian beam-shaped micro-channels on thick transparent PMMA material while being submerged in de-ionized water to mitigate the problems associated with infrared laser micro-channeling such as non-uniformity, combustion and region of altered properties due to heat. Micro-channel quality is assessed by measuring three key metrics: depth of cut, kerf width, and heat-affected zone. This analysis considers power, cutting speed, and pulse frequency. The laser transmission channelling experiment is conducted on PMMA employs a central composite rotatable experimental strategy. The optimal settings are set to have a depth of cut of 25.34 µm, a kerf width of 4.98 µm, and a HAZ width of 36.32 µm.
{"title":"A parametric evaluation of fiber laser micro-channelling performance on thick PMMA in water medium","authors":"S. Biswas , A. Sen , D. Pramanik , N. Roy , R. Biswas , A.S Kuar","doi":"10.1016/j.mseb.2024.117776","DOIUrl":"10.1016/j.mseb.2024.117776","url":null,"abstract":"<div><div>Polymers provide superior strength-to-weight ratios, malleability, cost-effectiveness, and recyclability compared to metals and alloys, rendering them highly favoured in the domains of automobile, electrical, medicinal, and thermal engineering. The present study employs a fiber laser as an approach to generate Gaussian beam-shaped micro-channels on thick transparent PMMA material while being submerged in de-ionized water to mitigate the problems associated with infrared laser micro-channeling such as non-uniformity, combustion and region of altered properties due to heat. Micro-channel quality is assessed by measuring three key metrics: depth of cut, kerf width, and heat-affected zone. This analysis considers power, cutting speed, and pulse frequency. The laser transmission channelling experiment is conducted on PMMA employs a central composite rotatable experimental strategy. The optimal settings are set to have a depth of cut of 25.34 µm, a kerf width of 4.98 µm, and a HAZ width of 36.32 µm.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering B-advanced Functional Solid-state Materials","volume":"311 ","pages":"Article 117776"},"PeriodicalIF":3.9,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142571844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-11-01DOI: 10.1016/j.mseb.2024.117778
Jihui Li, Dongsheng Wang, Fanning Meng, Guiqiang Wang
It is highly necessary to fabricate cost-effective counter electrode for promoting the development and practical deployment of dye-sensitized solar cells (DSSCs). Herein, nitrogen and sulfur co-doped porous carbon (NSPC) is prepared through directly carbonizing a renewable biomass, Eupatorium fortunei Turcz., and used as an alternative to expensive Pt to fabricate low-cost counter electrode for high-performance DSSCs. Scanning electron microscopy and N2 adsorption analyses demonstrate that the obtained carbon sample displays a hierarchical pore structure containing macropore channels and well-developed mesopores formed on the wall of macropore channels. X-ray photoelectron spectroscopy measurements suggest that nitrogen and sulfur atoms are doped in the framework of as-prepared carbon sample. These favorable characteristics endow the obtained NSPC counter electrode with a superior electrocatalytic performance. Consequently, the assembled DSSC with NSPC counter electrode shows an efficiency of 8.25%, nearly matching the efficiency of the cell with conventional Pt counter electrode.
{"title":"Nitrogen and sulfur co-doped porous carbon obtained from direct carbonization of a renewable biomass for counter electrode of efficient dye-sensitized solar cells","authors":"Jihui Li, Dongsheng Wang, Fanning Meng, Guiqiang Wang","doi":"10.1016/j.mseb.2024.117778","DOIUrl":"10.1016/j.mseb.2024.117778","url":null,"abstract":"<div><div>It is highly necessary to fabricate cost-effective counter electrode for promoting the development and practical deployment of dye-sensitized solar cells (DSSCs). Herein, nitrogen and sulfur co-doped porous carbon (NSPC) is prepared through directly carbonizing a renewable biomass, <em>Eupatorium fortunei Turcz</em>., and used as an alternative to expensive Pt to fabricate low-cost counter electrode for high-performance DSSCs. Scanning electron microscopy and N<sub>2</sub> adsorption analyses demonstrate that the obtained carbon sample displays a hierarchical pore structure containing macropore channels and well-developed mesopores formed on the wall of macropore channels. X-ray photoelectron spectroscopy measurements suggest that nitrogen and sulfur atoms are doped in the framework of as-prepared carbon sample. These favorable characteristics endow the obtained NSPC counter electrode with a superior electrocatalytic performance. Consequently, the assembled DSSC with NSPC counter electrode shows an efficiency of 8.25%, nearly matching the efficiency of the cell with conventional Pt counter electrode.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering B-advanced Functional Solid-state Materials","volume":"311 ","pages":"Article 117778"},"PeriodicalIF":3.9,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142571847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-10-31DOI: 10.1016/j.mseb.2024.117765
Qiang Ma , Yi Wang , Xianglong Zhang , Qianchen Zhao , Jinjun guo , Jiahu Guo , Xu Ren , Jin Huang , Yingjie Zhang , Yonghong Xie , Jiming Hao
This review explores the pivotal role of computational approaches in designing and developing Metal-Organic Frameworks (MOFs) for sustainable energy and environmental applications. As demand for advanced materials in energy conversion, storage, and environmental remediation intensifies, the synergy between theoretical simulations and experimental research has become critical. We provide a systematic overview of recent advancements in computational strategies guiding MOF synthesis and optimization, focusing on how these approaches offer insights into MOF mechanisms and working principles. The review examines fundamental computational techniques, including density functional theory, molecular dynamics, and machine learning, exploring their application in predicting and enhancing MOF performance for gas storage, catalysis, and pollutant capture. Through analysis of case studies, we demonstrate how computational modeling has successfully improved MOF performance in real-world scenarios. We also address challenges in bridging theory and experiment, discussing strategies for enhancing model accuracy and applicability.
{"title":"Computational design of Metal-Organic Frameworks for sustainable energy and environmental applications: Bridging theory and experiment","authors":"Qiang Ma , Yi Wang , Xianglong Zhang , Qianchen Zhao , Jinjun guo , Jiahu Guo , Xu Ren , Jin Huang , Yingjie Zhang , Yonghong Xie , Jiming Hao","doi":"10.1016/j.mseb.2024.117765","DOIUrl":"10.1016/j.mseb.2024.117765","url":null,"abstract":"<div><div>This review explores the pivotal role of computational approaches in designing and developing Metal-Organic Frameworks (MOFs) for sustainable energy and environmental applications. As demand for advanced materials in energy conversion, storage, and environmental remediation intensifies, the synergy between theoretical simulations and experimental research has become critical. We provide a systematic overview of recent advancements in computational strategies guiding MOF synthesis and optimization, focusing on how these approaches offer insights into MOF mechanisms and working principles. The review examines fundamental computational techniques, including density functional theory, molecular dynamics, and machine learning, exploring their application in predicting and enhancing MOF performance for gas storage, catalysis, and pollutant capture. Through analysis of case studies, we demonstrate how computational modeling has successfully improved MOF performance in real-world scenarios. We also address challenges in bridging theory and experiment, discussing strategies for enhancing model accuracy and applicability.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering B-advanced Functional Solid-state Materials","volume":"311 ","pages":"Article 117765"},"PeriodicalIF":3.9,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142560731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-10-30DOI: 10.1016/j.mseb.2024.117766
Muhammad Usama , Musammir Khan , Xingzhou Peng , Junjie Wang
Biocomposite films of chitosan (CS) and graphene oxide (GO) filler using glutaraldehyde crosslinker was prepared by Schiff-base linkages for enzyme-free biosensing applications. The obtained biocomposites (CS/GO) was characterized by different physicochemical techniques. The glassy carbon electrode (GCE) modified with these biocomposites indicated enhanced redox peak currents and peak separation potentials, as well as accompanied by a reduction in electron transfer resistance as compared with pristine CS material. The CS/GO modified GCE was tested for biosensing in the linear concentration range of glucose (Gl) ∼ 1.25 to 125 ppm, gallic acid (GA) ∼ 6.25 to 75 ppm and dopamine (DA) ∼ 25 to 100 ppm. Moreover, the biosensor indicated high sensitivity (72.9 µA.mM−1.cm−2), lower detection limit (0.094 mM) and lower quantification limit (0.313 mM) against Gl as compared with previous reported values. The proposed electro-oxidation mechanism on the modified GCE surface indicated the biocomposites as promising green electroactive smart materials for enzyme-free biosensing applications.
{"title":"Chitosan/graphene oxide based biocomposite dynamic films for enzyme-free biosensing application","authors":"Muhammad Usama , Musammir Khan , Xingzhou Peng , Junjie Wang","doi":"10.1016/j.mseb.2024.117766","DOIUrl":"10.1016/j.mseb.2024.117766","url":null,"abstract":"<div><div>Biocomposite films of chitosan (CS) and graphene oxide (GO) filler using glutaraldehyde crosslinker was prepared by Schiff-base linkages for enzyme-free biosensing applications. The obtained biocomposites (CS/GO) was characterized by different physicochemical techniques. The glassy carbon electrode (GCE) modified with these biocomposites indicated enhanced redox peak currents and peak separation potentials, as well as accompanied by a reduction in electron transfer resistance as compared with pristine CS material. The CS/GO modified GCE was tested for biosensing in the linear concentration range of glucose (Gl) ∼ 1.25 to 125 ppm, gallic acid (GA) ∼ 6.25 to 75 ppm and dopamine (DA) ∼ 25 to 100 ppm. Moreover, the biosensor indicated high sensitivity (72.9 µA.mM<sup>−1</sup>.cm<sup>−2</sup>), lower detection limit (0.094 mM) and lower quantification limit (0.313 mM) against Gl as compared with previous reported values. The proposed electro-oxidation mechanism on the modified GCE surface indicated the biocomposites as promising green electroactive smart materials for enzyme-free biosensing applications.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering B-advanced Functional Solid-state Materials","volume":"310 ","pages":"Article 117766"},"PeriodicalIF":3.9,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-10-30DOI: 10.1016/j.mseb.2024.117782
Fengjuan Miao , Bingchen Li , Tangjian Yao , Xiaojie Liu , Bairui Tao , Paul K. Chu
A chipless radio frequency identification (RFID) photosensitive sensor composed of zinc oxide (ZnO) / graphene oxide (GO) / cadmium sulfide (CdS) nanocomposites is designed and fabricated for remote monitoring of light in the environment. The label consists of a dielectric layer, a resonant structure, and a sensitive layer. The dielectric layer is made of inexpensive epoxy resin. By replacing the parallel plate capacitance of the traditional ELC resonator with the interdigital capacitance (idc), an ELC idc resonator with a larger capacitance per unit area is obtained and optimized by HFSS simulation. The label is evaluated using a vector network analyzer, and the experimental results confirm the feasibility of the photosensitive label. In the light environment of 0–49 klx, the sensitivity of the photosensitive label is 895.31 Hz/lx thus meeting the requirement for the monitoring of environmental light.
{"title":"Photosensitive RFID sensor based on ZnO/GO/CdS nanocomposite","authors":"Fengjuan Miao , Bingchen Li , Tangjian Yao , Xiaojie Liu , Bairui Tao , Paul K. Chu","doi":"10.1016/j.mseb.2024.117782","DOIUrl":"10.1016/j.mseb.2024.117782","url":null,"abstract":"<div><div>A chipless radio frequency identification (RFID) photosensitive sensor composed of zinc oxide (ZnO) / graphene oxide (GO) / cadmium sulfide (CdS) nanocomposites is designed and fabricated for remote monitoring of light in the environment. The label consists of a dielectric layer, a resonant structure, and a sensitive layer. The dielectric layer is made of inexpensive epoxy resin. By replacing the parallel plate capacitance of the traditional ELC resonator with the interdigital capacitance (idc), an ELC idc resonator with a larger capacitance per unit area is obtained and optimized by HFSS simulation. The label is evaluated using a vector network analyzer, and the experimental results confirm the feasibility of the photosensitive label. In the light environment of 0–49 klx, the sensitivity of the photosensitive label is 895.31 Hz/lx thus meeting the requirement for the monitoring of environmental light.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering B-advanced Functional Solid-state Materials","volume":"310 ","pages":"Article 117782"},"PeriodicalIF":3.9,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Low power density and low energy density associated with traditional devices, such as batteries, and supercapacitors led to the development of hybrid supercapacitors (HSCs). Researchers explore various classes of materials to cope with these limitations. Among them, transition metal dichalcogenides (TMDCs), due to their layered structure, are widely analyzed. Here the sputtering route was adopted to deposit a uniform interfacial layer of zirconium nitride (ZrN) 100 nm, which plays a crucial role in modulating the electrochemical properties of the top sputtered tungsten disulfide (WS2) layer of 250 nm. The electrochemical measurements resulted the specific capacitance of 858F/g for WS2 and 2036F/g for WS2/ZrN at scan rate of 3 mV/s. Hybrid device WS2/ZrN//AC exhibited an energy density of 76 Wh/kg, and a power density of 4325 W/kg. In addition to this, a semiempirical approach is adopted to deconvolute capacitive and diffusive contributions. This hybrid structure can improve charge storage capacity, stability, and cycle life, making it a promising material for next-generation energy storage solutions.
{"title":"Augmenting the electrochemical capability of TMDCs thin film electrodes via interface engineering for energy storage applications","authors":"Muhammad Zahir Iqbal , Asma Khizar , Sajid Khan , H.H. Hegazy , A.A. Alahmari","doi":"10.1016/j.mseb.2024.117757","DOIUrl":"10.1016/j.mseb.2024.117757","url":null,"abstract":"<div><div>Low power density and low energy density associated with traditional devices, such as batteries, and supercapacitors led to the development of hybrid supercapacitors (HSCs). Researchers explore various classes of materials to cope with these limitations. Among them, transition metal dichalcogenides (TMDCs), due to their layered structure, are widely analyzed. Here the sputtering route was adopted to deposit a uniform interfacial layer of zirconium nitride (ZrN) 100 nm, which plays a crucial role in modulating the electrochemical properties of the top sputtered tungsten disulfide (WS<sub>2</sub>) layer of 250 nm. The electrochemical measurements resulted the specific capacitance of 858F/g for WS2 and 2036F/g for WS<sub>2</sub>/ZrN at scan rate of 3 mV/s. Hybrid device WS<sub>2</sub>/ZrN//AC exhibited an energy density of 76 Wh/kg, and a power density of 4325 W/kg. In addition to this, a semiempirical approach is adopted to deconvolute capacitive and diffusive contributions. This hybrid structure can improve charge storage capacity, stability, and cycle life, making it a promising material for next-generation energy storage solutions.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering B-advanced Functional Solid-state Materials","volume":"310 ","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142528331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pure and cobalt-doped magnesium ferrite (Mg1-xCoxFe2O4, x = 0, 0.03, 0.06, and 0.09) nanoparticles were successfully synthesized via solgel method. X-ray diffraction (XRD) analysis conducted at room temperature validated the formation of single-phase spinel ferrites and assessed the material’s purity and crystal structure. Fourier transform infrared spectroscopy (FTIR) explored the diverse vibrational modes and the bonding arrangments between the atoms. Scanning electron microscopy (SEM) offered valuable insights into nanoparticles'morphology, shape, and size. Energy dispersive X-ray (EDX) spectroscopy was employed to analyze the composition of the prepared nanoparticles. An LCR meter was used at room temperture to analyze the dielectric properties of the synthesized nanoparticles. The study focused on the frequency dependence of key parameters, including capacitance () and real and imaginary parts of the dielectric constant (), tangent loss () and ac conductivity (). The dielectric measurements notably revealed high values of dielectric constants, particularly at lower frequencies. Doping of cobalt into pure MgFe2O4 has demonstrated a notable improvement in both charge storage and transport properties leading to enhanced dielectric parameters. The outcomes of this study suggest the promising applications of Mg1-xCoxFe2O4 nanoparticles in a wide range of energy storage devices.
通过溶胶法成功合成了纯镁铁氧体和掺钴镁铁氧体（Mg1-xCoxFe2O4，x = 0、0.03、0.06 和 0.09）纳米粒子。室温下进行的 X 射线衍射（XRD）分析验证了单相尖晶铁氧体的形成，并评估了材料的纯度和晶体结构。傅立叶变换红外光谱（FTIR）探究了不同的振动模式和原子间的成键排列。扫描电子显微镜（SEM）为了解纳米粒子的形态、形状和大小提供了宝贵的信息。能量色散 X 射线 (EDX) 光谱法用于分析制备的纳米粒子的成分。室温下使用 LCR 计分析合成纳米粒子的介电性能。研究重点是关键参数的频率依赖性，包括电容（Cp）、介电常数的实部和虚部（εr′&εr″）、正切损耗（tanδ）和交流电导率（σac）。介电测量明显显示出介电常数的高值，尤其是在较低频率时。在纯 MgFe2O4 中掺入钴后，电荷存储和传输特性都有显著改善，从而提高了介电参数。研究结果表明，Mg1-xCoxFe2O4 纳米粒子在各种储能设备中的应用前景广阔。
{"title":"Synthesis, structural characterization, and frequency dependent dielectric analysis of cobalt-doped magnesium ferrite nanoparticles for advanced energy storage systems","authors":"Zahid Sarfraz , Mozaffar Hussain , Mubasher , Muhammad Luqman , Rizwan Akram , Tahir","doi":"10.1016/j.mseb.2024.117780","DOIUrl":"10.1016/j.mseb.2024.117780","url":null,"abstract":"<div><div>Pure and cobalt-doped magnesium ferrite (Mg<sub>1-x</sub>Co<sub>x</sub>Fe<sub>2</sub>O<sub>4</sub>, x = 0, 0.03, 0.06, and 0.09) nanoparticles were successfully synthesized via solgel method. X-ray diffraction (XRD) analysis conducted at room temperature validated the formation of single-phase spinel ferrites and assessed the material’s purity and crystal structure. Fourier transform infrared spectroscopy (FTIR) explored the diverse vibrational modes and the bonding arrangments between the atoms. Scanning electron microscopy (SEM) offered valuable insights into nanoparticles'morphology, shape, and size. Energy dispersive X-ray (EDX) spectroscopy was employed to analyze the composition of the prepared nanoparticles. An LCR meter was used at room temperture to analyze the dielectric properties of the synthesized nanoparticles. The study focused on the frequency dependence of key parameters, including capacitance (<span><math><msub><mi>C</mi><mi>p</mi></msub></math></span>) and real and imaginary parts of the dielectric constant (<span><math><mrow><msubsup><mi>ε</mi><mrow><mi>r</mi></mrow><mo>′</mo></msubsup><mo>&</mo><msubsup><mi>ε</mi><mrow><mi>r</mi></mrow><mo>″</mo></msubsup></mrow></math></span>), tangent loss (<span><math><mrow><mi>t</mi><mi>a</mi><mi>n</mi><mspace></mspace><mi>δ</mi></mrow></math></span>) and ac conductivity (<span><math><msub><mi>σ</mi><mrow><mi>ac</mi></mrow></msub></math></span>). The dielectric measurements notably revealed high values of dielectric constants, particularly at lower frequencies. Doping of cobalt into pure MgFe<sub>2</sub>O<sub>4</sub> has demonstrated a notable improvement in both charge storage and transport properties leading to enhanced dielectric parameters. The outcomes of this study suggest the promising applications of Mg<sub>1-x</sub>Co<sub>x</sub>Fe<sub>2</sub>O<sub>4</sub> nanoparticles in a wide range of energy storage devices.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering B-advanced Functional Solid-state Materials","volume":"310 ","pages":"Article 117780"},"PeriodicalIF":3.9,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-10-29DOI: 10.1016/j.mseb.2024.117774
Nadiyah Alahmadi , Adel A. Ismail
Industrial contamination has harmed aquatic life by throwing huge quantities of toxic inorganic metals ions, especially Hg(II) ions into the ecosystem. Thus, it is critical demand to remove Hg species in industrial wastewater to match the safety standards. In this contribution, n-n heterojunction MnCo2O4/Bi2WO6 nanocomposites were fabricated using the sol–gel process utilizing Pluronic P-105 as a structure-directing agent. The photocatalytic Hg(II) reduction has been conducted over MnCo2O4/Bi2WO6 nanocomposites under illumination. The prepared MnCo2O4/Bi2WO6 photocatalysts exhibited better photocatalytic activity for reduction Hg(II) under visible illumination in comparison to bare Bi2WO6 NPs. Among the obtained photocatalysts, the optimum 6 %MnCo2O4/Bi2WO6 nanocomposite exhibited superior photocatalytic ability at about 100 % after 40 min. The rate constant of 6 %MnCo2O4/Bi2WO6 photocatalyst is 0.1177 min−1, which is almost 3.03 times greater than that of Bi2WO6 (0.0388 min−1). Moreover, the MnCo2O4/Bi2WO6 nanocomposite maintained its photocatalytic ability during five consecutive cycles. The mesostructure and S-scheme mechanism of MnCo2O4/Bi2WO6 nanocomposite promotes light absorption, high separation rate of carriers, and charge transport. The construction strategy of the obtained photocatalyst provides a feasible route for accelerating the practical abstraction of toxic Hg(II) ions.
{"title":"Integration of manganese-cobalt oxide nanoparticles into mesoporous Bi2WO6 n-n heterojunction for enhanced reductive removal of Hg(II) ions","authors":"Nadiyah Alahmadi , Adel A. Ismail","doi":"10.1016/j.mseb.2024.117774","DOIUrl":"10.1016/j.mseb.2024.117774","url":null,"abstract":"<div><div>Industrial contamination has harmed aquatic life by throwing huge quantities of toxic inorganic metals ions, especially Hg(II) ions into the ecosystem. Thus, it is critical demand to remove Hg species in industrial wastewater to match the safety standards. In this contribution, n-n heterojunction MnCo<sub>2</sub>O<sub>4</sub>/Bi<sub>2</sub>WO<sub>6</sub> nanocomposites were fabricated using the sol–gel process utilizing Pluronic P-105 as a structure-directing agent. The photocatalytic Hg(II) reduction has been conducted over MnCo<sub>2</sub>O<sub>4</sub>/Bi<sub>2</sub>WO<sub>6</sub> nanocomposites under illumination. The prepared MnCo<sub>2</sub>O<sub>4</sub>/Bi<sub>2</sub>WO<sub>6</sub> photocatalysts exhibited better photocatalytic activity for reduction Hg(II) under visible illumination in comparison to bare Bi<sub>2</sub>WO<sub>6</sub> NPs. Among the obtained photocatalysts, the optimum 6 %MnCo<sub>2</sub>O<sub>4</sub>/Bi<sub>2</sub>WO<sub>6</sub> nanocomposite exhibited superior photocatalytic ability at about 100 % after 40 min. The rate constant of 6 %MnCo<sub>2</sub>O<sub>4</sub>/Bi<sub>2</sub>WO<sub>6</sub> photocatalyst is 0.1177 min<sup>−1</sup>, which is almost 3.03 times greater than that of Bi<sub>2</sub>WO<sub>6</sub> (0.0388 min<sup>−1</sup>). Moreover, the MnCo<sub>2</sub>O<sub>4</sub>/Bi<sub>2</sub>WO<sub>6</sub> nanocomposite maintained its photocatalytic ability during five consecutive cycles. The mesostructure and S-scheme mechanism of MnCo<sub>2</sub>O<sub>4</sub>/Bi<sub>2</sub>WO<sub>6</sub> nanocomposite promotes light absorption, high separation rate of carriers, and charge transport. The construction strategy of the obtained photocatalyst provides a feasible route for accelerating the practical abstraction of toxic Hg(II) ions.</div></div>","PeriodicalId":18233,"journal":{"name":"Materials Science and Engineering B-advanced Functional Solid-state Materials","volume":"310 ","pages":"Article 117774"},"PeriodicalIF":3.9,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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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