Recently, much attention has been given to dielectric ceramic capacitors, which have excellent temperature stability and a high energy-storage density. Ecologically friendly ceramics ((1-x)(0.94Bi0.5Na0.5TiO3–0.06BaTiO3)-xBa(Mg1/3Ta2/3)O3, where x = 0, 0.15, 0.2, 0.25, or 0.3) were synthesised using a conventional solid-state method. The ceramic sample with x = 0.3 exhibited a superior dielectric temperature stability, relative permittivity that varied within ±15%, and low dielectric loss of less than 0.02 over a temperature range of −100 to +307 °C, which met the X9R specifications. In addition, a scanning electron microscopy image confirmed that the sample had a dense and uniform microstructure. Furthermore, a high recoverable energy-storage density of 6.75 J/cm3 was obtained for the ceramic sample with x = 0.3 under a moderate applied electric field of 420 kV/cm. These characteristics suggest that it is a promising candidate for an ecologically friendly temperature-insensitive dielectric ceramic for energy-storage capacitors.
{"title":"Superior dielectric temperature stability and high energy-storage density of ecologically friendly 0.7(0.94Bi0.5Na0.5TiO3–0.06BaTiO3)-0.3Ba(Mg1/3Ta2/3)O3 ceramics","authors":"Tianyu Li, Qisheng Chen, Yue Tian, Shuwang Shen, Aiwen Xie, Xuewen Jiang, Cong Zhou, Yi Zhang, Ruzhong Zuo","doi":"10.1016/j.materresbull.2024.113224","DOIUrl":"10.1016/j.materresbull.2024.113224","url":null,"abstract":"<div><div>Recently, much attention has been given to dielectric ceramic capacitors, which have excellent temperature stability and a high energy-storage density. Ecologically friendly ceramics ((1-<em>x</em>)(0.94Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>–0.06BaTiO<sub>3</sub>)-<em>x</em>Ba(Mg<sub>1/3</sub>Ta<sub>2/3</sub>)O<sub>3</sub>, where <em>x</em> = 0, 0.15, 0.2, 0.25, or 0.3) were synthesised using a conventional solid-state method. The ceramic sample with <em>x</em> = 0.3 exhibited a superior dielectric temperature stability, relative permittivity that varied within ±15%, and low dielectric loss of less than 0.02 over a temperature range of −100 to +307 °C, which met the X9R specifications. In addition, a scanning electron microscopy image confirmed that the sample had a dense and uniform microstructure. Furthermore, a high recoverable energy-storage density of 6.75 <em>J</em>/cm<sup>3</sup> was obtained for the ceramic sample with <em>x</em> = 0.3 under a moderate applied electric field of 420 kV/cm. These characteristics suggest that it is a promising candidate for an ecologically friendly temperature-insensitive dielectric ceramic for energy-storage capacitors.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"183 ","pages":"Article 113224"},"PeriodicalIF":5.3,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142705732","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}
This work presents an inorganic halide perovskite (CsPbBr3) is interfaced with a europium metal-organic framework (Eu-MOF). The presence of characteristic absorption edge and band edge emission of CsPbBr3 reveal a successful formation of CsPbBr3@Eu-MOF hybrid. The bi-flower morphology of Eu-MOF has tetragonal structure with space group P4322. The conical part of the bi-flower consists of many squared rods of edge length 200 nm. The CsPbBr3@Eu-MOF shows color-tunable emission under different excitation wavelengths whose CIE color coordinate covers the entire green to red region. The maximum luminous efficacy of the optical radiation achieved is 359 lm/W, and the maximum color purity is 94.4 %, which is significant for optical applications. Further for anti-counterfeiting application, a pattern “LMDD” is encrypted on four different substrates and the color change is captured under different excitation wavelengths. The results show that CsPbBr3@Eu-MOF is highly suitable for encryption and decryption of security codes particularly on plastic surface.
{"title":"Interfacing inorganic halide perovskites with metal-organic frameworks: Color tunable emission, energy transfer, and advanced anti-counterfeiting application","authors":"Santosh Kachhap , Akhil Kumar Rai , Akhilesh Kumar Singh , Sunil Kumar Singh","doi":"10.1016/j.materresbull.2024.113218","DOIUrl":"10.1016/j.materresbull.2024.113218","url":null,"abstract":"<div><div>This work presents an inorganic halide perovskite (CsPbBr<sub>3</sub>) is interfaced with a europium metal-organic framework (Eu-MOF). The presence of characteristic absorption edge and band edge emission of CsPbBr<sub>3</sub> reveal a successful formation of CsPbBr<sub>3</sub>@Eu-MOF hybrid. The bi-flower morphology of Eu-MOF has tetragonal structure with space group <em>P</em>4<sub>3</sub>22. The conical part of the bi-flower consists of many squared rods of edge length 200 nm. The CsPbBr<sub>3</sub>@Eu-MOF shows color-tunable emission under different excitation wavelengths whose CIE color coordinate covers the entire green to red region. The maximum luminous efficacy of the optical radiation achieved is 359 lm/W, and the maximum color purity is 94.4 %, which is significant for optical applications. Further for anti-counterfeiting application, a pattern “LMDD” is encrypted on four different substrates and the color change is captured under different excitation wavelengths. The results show that CsPbBr<sub>3</sub>@Eu-MOF is highly suitable for encryption and decryption of security codes particularly on plastic surface.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"183 ","pages":"Article 113218"},"PeriodicalIF":5.3,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142705735","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 : 2024-11-19DOI: 10.1016/j.materresbull.2024.113221
Basharat Hussain , Abid Ullah , Wasim Abbas , Shahbaz Ahmad , Mehmet Egilmez , P. Rosaiah , Yusuf Siraj Usmani , Tensangmu Lama Tamang , Iftikhar Hussain
Anatase phase TiO2 nanoparticles were successfully synthesized by annealing amorphous colloidal TiO2 spheres. The colloidal TiO2 nanoparticles exhibited enhanced specific discharge capacities ∼296 (0.1C), 185 (1C), 127 (2C), 101 (5C) and 82 mAh g-1 (10C) in contrast to their amorphous counterparts ∼182 (0.1C), 119 (1C), 81 (2 C), 43 (5 C) and 18 mAh g-1 (∼10C rates). Amorphous TiO2 nanoparticles developed a layer of solid electrolyte interface (SEI) comprising lithium carbonate, lithium alkyl carbonates, and organic phosphates, leading to heightened intrinsic resistance of cells and diminished performance in terms of rate and cycling. Conversely, annealing at high temperatures effectively eliminates chemisorbed water and hydroxyl groups, resulting in improved stability under varying rates and during cycling for lithium-ion batteries based on titanium dioxide. The annealed colloidal TiO2 demonstrated notably elevated specific discharge capacities and capacity retention of 93.5 % compared to amorphous titanium dioxide spheres of 42.1 %.
通过对无定形胶体二氧化钛球进行退火处理，成功合成了非晶相二氧化钛纳米粒子。胶体二氧化钛纳米粒子的比放电容量分别为 296（0.1C）、185（1C）、127（2C）、101（5C）和 82 mAh g-1（10C），而非晶态纳米粒子的比放电容量分别为 182（0.1C）、119（1C）、81（2C）、43（5C）和 18 mAh g-1（∼10C速率）。无定形二氧化钛纳米粒子形成了一层由碳酸锂、烷基碳酸锂和有机磷酸盐组成的固体电解质界面（SEI），导致电池的内在电阻增加，并降低了电池的速率和循环性能。相反，高温退火可有效消除化学吸附水和羟基，从而提高基于二氧化钛的锂离子电池在不同速率和循环过程中的稳定性。与无定形二氧化钛球的 42.1% 相比，退火胶体二氧化钛的比放电容量和容量保持率显著提高，达到 93.5%。
{"title":"Colloidal TiO₂ solid spheres as high-performance anodes for Lithium-ion batteries: Synthesis, characterization, and optimization","authors":"Basharat Hussain , Abid Ullah , Wasim Abbas , Shahbaz Ahmad , Mehmet Egilmez , P. Rosaiah , Yusuf Siraj Usmani , Tensangmu Lama Tamang , Iftikhar Hussain","doi":"10.1016/j.materresbull.2024.113221","DOIUrl":"10.1016/j.materresbull.2024.113221","url":null,"abstract":"<div><div>Anatase phase TiO<sub>2</sub> nanoparticles were successfully synthesized by annealing amorphous colloidal TiO<sub>2</sub> spheres. The colloidal TiO<sub>2</sub> nanoparticles exhibited enhanced specific discharge capacities ∼296 (0.1C), 185 (1C), 127 (2C), 101 (5C) and 82 mAh g<sup>-1</sup> (10C) in contrast to their amorphous counterparts ∼182 (0.1C), 119 (1C), 81 (2 C), 43 (5 C) and 18 mAh g<sup>-1</sup> (∼10C rates). Amorphous TiO<sub>2</sub> nanoparticles developed a layer of solid electrolyte interface (SEI) comprising lithium carbonate, lithium alkyl carbonates, and organic phosphates, leading to heightened intrinsic resistance of cells and diminished performance in terms of rate and cycling. Conversely, annealing at high temperatures effectively eliminates chemisorbed water and hydroxyl groups, resulting in improved stability under varying rates and during cycling for lithium-ion batteries based on titanium dioxide. The annealed colloidal TiO<sub>2</sub> demonstrated notably elevated specific discharge capacities and capacity retention of 93.5 % compared to amorphous titanium dioxide spheres of 42.1 %.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"183 ","pages":"Article 113221"},"PeriodicalIF":5.3,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721233","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 : 2024-11-19DOI: 10.1016/j.materresbull.2024.113214
Sakshi Sharma , Aman Deep Acharya , Yugesh Singh Thakur , Bhawna
This study explores mesoporous BiOCl nanoparticles as a promising photocatalyst for low-density polyethylene (LDPE) degradation under visible light for the first time. A solvothermal synthesis yields BiOCl nanoparticles with a high ratio of exposed {010} facets and abundant oxygen vacancies (OVs). These properties, along with the co-existence of Bi³-x and Bi³⁺x defect states, promote a tailored surface chemistry with high surface-bound hydroxyl groups. These properties optimize light absorption by inducing favorable surface states, leading to a red shift in the light absorption edge for efficient utilization of visible light. Additionally, OVs suppress the recombination of photo-generated charge carriers and enhance their transfer rate. Furthermore, the free-standing LDPE/BiOCl nanocomposite films of 50μm, prepared via solution casting technique with varying BiOCl weight percentages (3, 5, and 7 wt.%), exhibit remarkable photocatalytic activity. The analysis of photodegraded LDPE confirms the presence of carbonyl groups (C.I.= 86%), cracks, pores, and hydroxyl radicals (•OH), alongside reduced thermal stability and band gap changes. Through meticulous analysis of the results obtained, we have ascertained that the optimal photocatalytic degradation of LDPE is achieved by incorporating up to 5 wt.% of BiOCl.
{"title":"Solvothermal synthesized mesoporous BiOCl nano-ellipsoids with oxygen vacancies for photocatalytic degradation of low density polyethylene (LDPE) plastic","authors":"Sakshi Sharma , Aman Deep Acharya , Yugesh Singh Thakur , Bhawna","doi":"10.1016/j.materresbull.2024.113214","DOIUrl":"10.1016/j.materresbull.2024.113214","url":null,"abstract":"<div><div>This study explores mesoporous BiOCl nanoparticles as a promising photocatalyst for low-density polyethylene (LDPE) degradation under visible light for the first time. A solvothermal synthesis yields BiOCl nanoparticles with a high ratio of exposed {010} facets and abundant oxygen vacancies (OVs). These properties, along with the co-existence of Bi³<sup>-x</sup> and Bi³⁺<sup>x</sup> defect states, promote a tailored surface chemistry with high surface-bound hydroxyl groups. These properties optimize light absorption by inducing favorable surface states, leading to a red shift in the light absorption edge for efficient utilization of visible light. Additionally, OVs suppress the recombination of photo-generated charge carriers and enhance their transfer rate. Furthermore, the free-standing LDPE/BiOCl nanocomposite films of 50μm, prepared via solution casting technique with varying BiOCl weight percentages (3, 5, and 7 wt.%), exhibit remarkable photocatalytic activity. The analysis of photodegraded LDPE confirms the presence of carbonyl groups (C.I.= 86%), cracks, pores, and hydroxyl radicals (•OH), alongside reduced thermal stability and band gap changes. Through meticulous analysis of the results obtained, we have ascertained that the optimal photocatalytic degradation of LDPE is achieved by incorporating up to 5 wt.% of BiOCl.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"183 ","pages":"Article 113214"},"PeriodicalIF":5.3,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721236","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 : 2024-11-19DOI: 10.1016/j.materresbull.2024.113212
K. Sumi, K.S. Supraja, R.C. Aashika, M. Arivanandhan
Semiconductor-based photocatalysts offer potential solutions for carcinogenic dye-related issues in water under light irradiation. However, their efficiency is affected by the recombination of photoelectrons and holes. The present study focuses on synthesizing biomass-derived activated carbon (AC), Cerium Oxide (CeO2), and AC/CeO2 (ACO) nanocomposites for toxic dye degradation. The physicochemical properties of samples were analyzed by XRD, SEM, EDX, TEM, UV–visible, Raman, XPS, and PL analysis. The photocatalytic performance of AC, CeO2, and ACO nanocomposites was evaluated under dark and light conditions for the removal of carcinogenic Rhodamine B (RhB). ACO nanocomposites exhibited adsorptive-photocatalytic performance, displaying unique adsorption and photocatalytic degradation rates due to their synergistic combination. Remarkably, the ACO-4 composite showed lower recombination of e−/h+ pairs, thereby exhibiting superior photocatalytic activity compared to other samples. The degradation rate constant under light was 0.1815 min⁻¹ with a half-life time of 3.81 min, whereas in dark, it was 0.0665 min⁻¹ with a half-life time of 10.42 min.
{"title":"Biomass-derived activated carbon/cerium oxide nanocomposite as adsorptive photocatalyst for effective removal of carcinogenic dye","authors":"K. Sumi, K.S. Supraja, R.C. Aashika, M. Arivanandhan","doi":"10.1016/j.materresbull.2024.113212","DOIUrl":"10.1016/j.materresbull.2024.113212","url":null,"abstract":"<div><div>Semiconductor-based photocatalysts offer potential solutions for carcinogenic dye-related issues in water under light irradiation. However, their efficiency is affected by the recombination of photoelectrons and holes. The present study focuses on synthesizing biomass-derived activated carbon (AC), Cerium Oxide (CeO<sub>2</sub>), and AC/CeO<sub>2</sub> (ACO) nanocomposites for toxic dye degradation. The physicochemical properties of samples were analyzed by XRD, SEM, EDX, TEM, UV–visible, Raman, XPS, and PL analysis. The photocatalytic performance of AC, CeO<sub>2,</sub> and ACO nanocomposites was evaluated under dark and light conditions for the removal of carcinogenic Rhodamine B (RhB). ACO nanocomposites exhibited adsorptive-photocatalytic performance, displaying unique adsorption and photocatalytic degradation rates due to their synergistic combination. Remarkably, the ACO-4 composite showed lower recombination of <em>e</em><sup>−</sup>/<em>h</em><sup>+</sup> pairs, thereby exhibiting superior photocatalytic activity compared to other samples. The degradation rate constant under light was 0.1815 min⁻¹ with a half-life time of 3.81 min, whereas in dark, it was 0.0665 min⁻¹ with a half-life time of 10.42 min.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"183 ","pages":"Article 113212"},"PeriodicalIF":5.3,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721234","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}
A remarkable Zn-doped Co3O4 nanoparticle material exhibiting exceptional potential as a triethylamine (TEA) sensor was presented. Zn-doped Co3O4 nanoparticles were synthesized using a facile solvothermal method with varying concentrations of zinc dopant. The effects of Zn doping on the sensor triethylamine detection capabilities were investigated, revealing a notable enhancement in sensitivity and selectivity with a response of 2.04 at 25 °C. Furthermore, the calculated response and recovery times at the optimum temperature were 7.5 s and 27.8 s, respectively, making it an energy-efficient and quicker alternative to conventional sensors. This improvement in the sensing performance can be attributed to the optimized electronic structure and chemical properties achieved through Zn doping, which promoted the formation of abundant oxygen vacancies and improved the number of adsorption sites. These findings demonstrate that Zn-doped Co3O4 nanoparticles are promising sensor materials for efficient TEA detection, with potential applications in various industries.
{"title":"Zn-doped Co3O4 nanoparticles: promising room temperature sensor materials for efficient triethylamine (TEA) detection","authors":"Amensisa Negasa Begi , Shahid Hussain , Jesse Nii Okai Amu-Darko , Tahani Mazyad Almutairi , Muhammad Javed Liaqat , Amjad Iqbal , Rajesh Kumar Manavalan , Xiangzhao Zhang , Guanjun Qiao , Guiwu Liu","doi":"10.1016/j.materresbull.2024.113201","DOIUrl":"10.1016/j.materresbull.2024.113201","url":null,"abstract":"<div><div>A remarkable Zn-doped Co<sub>3</sub>O<sub>4</sub> nanoparticle material exhibiting exceptional potential as a triethylamine (TEA) sensor was presented. Zn-doped Co<sub>3</sub>O<sub>4</sub> nanoparticles were synthesized using a facile solvothermal method with varying concentrations of zinc dopant. The effects of Zn doping on the sensor triethylamine detection capabilities were investigated, revealing a notable enhancement in sensitivity and selectivity with a response of 2.04 at 25 °C. Furthermore, the calculated response and recovery times at the optimum temperature were 7.5 s and 27.8 s, respectively, making it an energy-efficient and quicker alternative to conventional sensors. This improvement in the sensing performance can be attributed to the optimized electronic structure and chemical properties achieved through Zn doping, which promoted the formation of abundant oxygen vacancies and improved the number of adsorption sites. These findings demonstrate that Zn-doped Co<sub>3</sub>O<sub>4</sub> nanoparticles are promising sensor materials for efficient TEA detection, with potential applications in various industries.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"183 ","pages":"Article 113201"},"PeriodicalIF":5.3,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142705723","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 : 2024-11-17DOI: 10.1016/j.materresbull.2024.113213
Thirumalai Lakshmi , A. Mohammed Basheer Ali , Noor Danish Ahrar Mundari , T. Mishra , Noor Aman
Cu2O loaded NiTiO3 based p-n heterojunction photocatalysts of various proportions have been synthesized by liquid phase reduction process resulting in NiTiO3 nanoparticles dispersed on the surface of Cu2O. Formation of both oxide phases is confirmed from the XRD, HR-SEM and XPS analysis. Heterojunction formation is confirmed by the intimate contact between NiTiO3 and Cu2O as evidenced by HR-TEM. UV-Vis spectra exhibit a red shift indicating the extended visible light absorption. XPS shows the presence of oxidation states of Ni2+, Ti4+, Cu+, Cu2+ and O2-. Heterojunction materials showed enhanced activity for the simultaneous photocatalytic reduction of Cr (VI) and degradation of Alizarine Cyanine Green dye under visible light irradiation. 1:2 ratio of Cu2O and NiTiO3 heterojunction (1C:2N) material exhibits 100% dye degradation in 90 minutes and Cr (VI) reduction in 180 minutes. Higher activity of Cu2O-NiTiO3 p-n heterojunction is ascribed to the effective charge separation and extended visible light absorption
{"title":"Integration of Cu2O-NiTiO3 as an efficient p-n heterojunction visible light photocatalytic system for the simultaneous removal of Cr (VI) and Alizarine Cyanine Green dye","authors":"Thirumalai Lakshmi , A. Mohammed Basheer Ali , Noor Danish Ahrar Mundari , T. Mishra , Noor Aman","doi":"10.1016/j.materresbull.2024.113213","DOIUrl":"10.1016/j.materresbull.2024.113213","url":null,"abstract":"<div><div>Cu<sub>2</sub>O loaded NiTiO<sub>3</sub> based p-n heterojunction photocatalysts of various proportions have been synthesized by liquid phase reduction process resulting in NiTiO<sub>3</sub> nanoparticles dispersed on the surface of Cu<sub>2</sub>O. Formation of both oxide phases is confirmed from the XRD, HR-SEM and XPS analysis. Heterojunction formation is confirmed by the intimate contact between NiTiO<sub>3</sub> and Cu<sub>2</sub>O as evidenced by HR-TEM. UV-Vis spectra exhibit a red shift indicating the extended visible light absorption. XPS shows the presence of oxidation states of Ni<sup>2+</sup>, Ti<sup>4+</sup>, Cu<sup>+</sup>, Cu<sup>2+</sup> and O<sup>2-</sup>. Heterojunction materials showed enhanced activity for the simultaneous photocatalytic reduction of Cr (VI) and degradation of Alizarine Cyanine Green dye under visible light irradiation. 1:2 ratio of Cu<sub>2</sub>O and NiTiO<sub>3</sub> heterojunction (1C:2N) material exhibits 100% dye degradation in 90 minutes and Cr (VI) reduction in 180 minutes. Higher activity of Cu<sub>2</sub>O-NiTiO<sub>3</sub> p-n heterojunction is ascribed to the effective charge separation and extended visible light absorption</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"183 ","pages":"Article 113213"},"PeriodicalIF":5.3,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142705728","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 : 2024-11-17DOI: 10.1016/j.materresbull.2024.113210
Aliva Saha , Tanmoy Chakraborty , Suman Saha , Subhojit Dutta , Tanmay Kundu , Sayak Mukherjee , Sukhen Das , Soumyaditya Sutradhar
The effects of size and distribution of magnetic filler materials with different loading percentages inside PVDF matrix having mono-layer and multi-layer structures for the modulation of EMI shielding behavior are discussed in the present report. W-type hexaferrites are prepared using the sol-gel method, followed by the manually mortared and ball-milled techniques and embedded inside the PVDF matrix separately. Phase analysis and morphological studies are performed and discussed herein to understand the effect of ball mill technique, over the manually mortared process of W-type hexaferrites. Magnetic and dielectric studies are performed and the influence of the ball mill technique on magnetic and dielectric behavior of nanofillers as well as nanocomposite systems are discussed. Various physical properties of the nanocomposite films are performed within the range of 8-12 GHz. Significant modulations of complex permeability and the complex permittivity with size, distribution and loading percentage of the W-type hexaferrite inside PVDF matrix are found and the effect of impedance matching on EMI shielding behavior are also discussed. EMI shielding behavior of the resultant W-type hexaferrite-PVDF films in the 8-12 GHz frequency region shows the modulations of their absorption and/or reflection effectiveness due to the variation of the size, distribution and loading percentage of magnetic filler materials inside PVDF matrix. Both mono-layer and multi-layer structures of W-type hexaferrite-PVDF films are considered and the effect of thickness on the various parts of EMI shielding behavior is also reported.
本报告讨论了具有单层和多层结构的 PVDF 基体中不同负载百分比的磁性填料的尺寸和分布对 EMI 屏蔽行为的调节作用。采用溶胶-凝胶法制备了 W 型六氟化碳，然后采用手工砂浆和球磨技术将其分别嵌入 PVDF 基体中。本文进行并讨论了相分析和形态学研究，以了解球磨技术对 W 型六铁氧体手工砂浆工艺的影响。还进行了磁性和介电研究，并讨论了球磨技术对纳米填料和纳米复合材料系统的磁性和介电行为的影响。在 8-12 GHz 范围内对纳米复合薄膜的各种物理特性进行了研究。研究发现，复磁导率和复介电常数随 PVDF 基体中 W 型六亚铁氧体的尺寸、分布和负载百分比而发生显著变化，同时还讨论了阻抗匹配对 EMI 屏蔽行为的影响。由于 PVDF 基体中磁性填充材料的尺寸、分布和装载百分比的变化，所生成的 W 型六铁氧体-PVDF 薄膜在 8-12 GHz 频率区域的 EMI 屏蔽行为显示出其吸收和/或反射效果的变化。研究还考虑了 W 型六氟丙烯-PVDF 薄膜的单层和多层结构，并报告了厚度对 EMI 屏蔽行为各部分的影响。
{"title":"Superior EMI shielding behavior of multi-layer structure of PVDF based laminated nanocomposite material by controlling the size and distribution of W-type hexaferrite magnetic nanofillers therein","authors":"Aliva Saha , Tanmoy Chakraborty , Suman Saha , Subhojit Dutta , Tanmay Kundu , Sayak Mukherjee , Sukhen Das , Soumyaditya Sutradhar","doi":"10.1016/j.materresbull.2024.113210","DOIUrl":"10.1016/j.materresbull.2024.113210","url":null,"abstract":"<div><div>The effects of size and distribution of magnetic filler materials with different loading percentages inside PVDF matrix having mono-layer and multi-layer structures for the modulation of EMI shielding behavior are discussed in the present report. W-type hexaferrites are prepared using the sol-gel method, followed by the manually mortared and ball-milled techniques and embedded inside the PVDF matrix separately. Phase analysis and morphological studies are performed and discussed herein to understand the effect of ball mill technique, over the manually mortared process of W-type hexaferrites. Magnetic and dielectric studies are performed and the influence of the ball mill technique on magnetic and dielectric behavior of nanofillers as well as nanocomposite systems are discussed. Various physical properties of the nanocomposite films are performed within the range of 8-12 GHz. Significant modulations of complex permeability and the complex permittivity with size, distribution and loading percentage of the W-type hexaferrite inside PVDF matrix are found and the effect of impedance matching on EMI shielding behavior are also discussed. EMI shielding behavior of the resultant W-type hexaferrite-PVDF films in the 8-12 GHz frequency region shows the modulations of their absorption and/or reflection effectiveness due to the variation of the size, distribution and loading percentage of magnetic filler materials inside PVDF matrix. Both mono-layer and multi-layer structures of W-type hexaferrite-PVDF films are considered and the effect of thickness on the various parts of EMI shielding behavior is also reported.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"183 ","pages":"Article 113210"},"PeriodicalIF":5.3,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142705733","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}
Composite polymer-ceramic electrolytes (CPEs) are emerging as viable substitute providing high ionic conductivity, mechanical stability, and good safety for the progress of all-solid-state rechargeable batteries. Here, SiO2 particles were generated from beach sands via a simple gelation method and embedded in to poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) to obtain precisely two types of the electrolytes namely, electrospun and solution casted. The 2.5 wt.% SiO2-embedded CPEs generated by electrospinning and solution-casting exhibit best ionic conductivities being 3.6 × 10–4 and 1.3 × 10–4 S cm-1 at 30 °C, respectively. The polarization voltage for the electrospun CPE was particularly low and showed an extremely stable voltage plateau up to 300 h demonstrating high electrochemical compatibility and immense cycling stability. Consequently, the all solid-state lithium metal battery (Li|CPE|LiFePO4) using the electrospun CPE initially exhibits a discharge capacity of 142 mAh g-1 at 0.1C-rate superior to that of the full cell using the solution-casted CPE.
复合聚合物陶瓷电解质（CPEs）具有高离子电导率、机械稳定性和良好的安全性，正在成为全固态充电电池的可行替代品。在这里，通过简单的凝胶化方法从海滩砂中生成了二氧化硅颗粒，并将其嵌入聚偏二氟乙烯-六氟丙烯（PVDF-HFP）中，从而获得了两种类型的电解质，即电纺电解质和溶液浇铸电解质。通过电纺丝和溶液浇铸生成的 2.5 wt.% 嵌入二氧化硅的氯化聚乙烯在 30 °C 时的离子电导率最好，分别为 3.6 × 10-4 和 1.3 × 10-4 S cm-1。电纺丝氯化聚乙烯的极化电压特别低，并在 300 小时内显示出极其稳定的电压平台，这表明其具有很高的电化学兼容性和巨大的循环稳定性。因此，使用电纺丝 CPE 的全固态锂金属电池（Li|CPE|LiFePO4）最初在 0.1C 速率下的放电容量为 142 mAh g-1，优于使用溶液浇铸 CPE 的全电池。
{"title":"Silica-reinforced functional composite polymer electrolyte with high electrochemical compatibility for solid-state lithium metal battery","authors":"Bhargabi Halder , A. Santhana Krishna Kumar , Wei-Lung Tseng , Perumal Elumalai","doi":"10.1016/j.materresbull.2024.113209","DOIUrl":"10.1016/j.materresbull.2024.113209","url":null,"abstract":"<div><div>Composite polymer-ceramic electrolytes (CPEs) are emerging as viable substitute providing high ionic conductivity, mechanical stability, and good safety for the progress of all-solid-state rechargeable batteries. Here, SiO<sub>2</sub> particles were generated from beach sands via a simple gelation method and embedded in to poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) to obtain precisely two types of the electrolytes namely, electrospun and solution casted. The 2.5 wt.% SiO<sub>2</sub>-embedded CPEs generated by electrospinning and solution-casting exhibit best ionic conductivities being 3.6 × 10<sup>–4</sup> and 1.3 × 10<sup>–4</sup> S cm<sup>-1</sup> at 30 °C, respectively. The polarization voltage for the electrospun CPE was particularly low and showed an extremely stable voltage plateau up to 300 h demonstrating high electrochemical compatibility and immense cycling stability. Consequently, the all solid-state lithium metal battery (Li|CPE|LiFePO<sub>4</sub>) using the electrospun CPE initially exhibits a discharge capacity of 142 mAh g<sup>-1</sup> at 0.1C-rate superior to that of the full cell using the solution-casted CPE.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"183 ","pages":"Article 113209"},"PeriodicalIF":5.3,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142705731","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 : 2024-11-17DOI: 10.1016/j.materresbull.2024.113211
Samira Doostikhah , Mehdi Shabani-Nooshabadi , Ali Ehsani , Mohammad Bigdeloo
This research focused on synthesizing nanocomposites from vanadium-1.3.5-benzene tricarboxylic acid (V-BTC), vanadium-molibden-1.3.5-benzene tricarboxylic acid (V-BTC-Mo), and vanadium-molibden-1.3.5-benzene tricarboxylic acid/poly-orto-aminophenol (V-BTC-Mo/POAP) using chemical and electrochemical methods. The materials were analyzed using various analytical techniques such as XRD, FT-IR, FE-SEM, Elemental Mapping, and Edx. The SEM images revealed a nanorod structure of metal-organic framework (MOF) with a high specific surface area (SSA) of 131.13 m2.g−1 determined by nitrogen adsorption-desorption analysis. Electrochemical techniques including galvanostatic charge-discharge (GCD), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV) were employed to assess the supercapacitor (SC) properties. The results indicated that the V-BTC-MO/POAP composite exhibited a high specific capacitance (Cs) of 420.2 F g−1, with a high energy density of 38.1 Wh kg−1 at a power density of 236.2 W kg−1. Also, the V-BTC-Mo/POAP electrode demonstrated a good performance in structural stability by maintaining 97.3 % of the initial capacitance after 5000 continuous charge-discharge. Overall, the research aimed to develop a new methodology for synthesizing bimetallic nanocomposites and enhancing the performance of SCs in a three and two-electrode system, particularly focusing on vanadium and MOF-based electrodes.
{"title":"Electropolymerization of an Ultra-thin Film on bimetallic nanocomposite: Enhanced performance, perfect stability for supercapacitors","authors":"Samira Doostikhah , Mehdi Shabani-Nooshabadi , Ali Ehsani , Mohammad Bigdeloo","doi":"10.1016/j.materresbull.2024.113211","DOIUrl":"10.1016/j.materresbull.2024.113211","url":null,"abstract":"<div><div>This research focused on synthesizing nanocomposites from vanadium-1.3.5-benzene tricarboxylic acid (V-BTC), vanadium-molibden-1.3.5-benzene tricarboxylic acid (V-BTC-Mo), and vanadium-molibden-1.3.5-benzene tricarboxylic acid/poly-orto-aminophenol (V-BTC-Mo/POAP) using chemical and electrochemical methods. The materials were analyzed using various analytical techniques such as XRD, FT-IR, FE-SEM, Elemental Mapping, and Edx. The SEM images revealed a nanorod structure of metal-organic framework (MOF) with a high specific surface area (SSA) of 131.13 m<sup>2</sup>.g<sup>−1</sup> determined by nitrogen adsorption-desorption analysis. Electrochemical techniques including galvanostatic charge-discharge (GCD), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV) were employed to assess the supercapacitor (SC) properties. The results indicated that the V-BTC-MO/POAP composite exhibited a high specific capacitance (Cs) of 420.2 F g<sup>−1</sup>, with a high energy density of 38.1 Wh kg<sup>−1</sup> at a power density of 236.2 W kg<sup>−1</sup>. Also, the V-BTC-Mo/POAP electrode demonstrated a good performance in structural stability by maintaining 97.3 % of the initial capacitance after 5000 continuous charge-discharge. Overall, the research aimed to develop a new methodology for synthesizing bimetallic nanocomposites and enhancing the performance of SCs in a three and two-electrode system, particularly focusing on vanadium and MOF-based electrodes.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"183 ","pages":"Article 113211"},"PeriodicalIF":5.3,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142705734","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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