This research paper highlights the enhanced humidity sensing and photocatalytic capabilities of Er2O3/COK-12 nanostructures. Advanced characterization techniques such as SAXS, WAXRD, FESEM, and HRTEM reveal their crystalline integrity, porous morphology, and uniform erbium distribution within the COK-12 framework. BET surface area analysis shows a substantial 893 m²g-1, facilitating efficient water vapor adsorption and desorption. The 6 %-Er2O3/COK-12 sensor exhibits outstanding humidity sensing performance with a 5-order resistance change, response time of 9 s, recovery time of 8 s, high sensitivity, and stability over 42 days. Additionally, this material demonstrates excellent photocatalytic activity, achieving 90 % reduction in Rose Bengal dye.
{"title":"Structural insights and performance evaluation of Er2O3/COK-12 nanostructures for humidity sensing and photocatalysis","authors":"Bhavna Rohilla, Aryan Boora, Supriya Sehrawat, Priya Malik, Surender Duhan","doi":"10.1016/j.materresbull.2024.113264","DOIUrl":"10.1016/j.materresbull.2024.113264","url":null,"abstract":"<div><div>This research paper highlights the enhanced humidity sensing and photocatalytic capabilities of Er<sub>2</sub>O<sub>3</sub>/COK-12 nanostructures. Advanced characterization techniques such as SAXS, WAXRD, FESEM, and HRTEM reveal their crystalline integrity, porous morphology, and uniform erbium distribution within the COK-12 framework. BET surface area analysis shows a substantial 893 m²g<sup>-1</sup>, facilitating efficient water vapor adsorption and desorption. The 6 %-Er<sub>2</sub>O<sub>3</sub>/COK-12 sensor exhibits outstanding humidity sensing performance with a 5-order resistance change, response time of 9 s, recovery time of 8 s, high sensitivity, and stability over 42 days. Additionally, this material demonstrates excellent photocatalytic activity, achieving 90 % reduction in Rose Bengal dye.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"184 ","pages":"Article 113264"},"PeriodicalIF":5.3,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143159251","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 : 2024-12-12DOI: 10.1016/j.materresbull.2024.113263
Boshuo Shi , Bo Wang , Yujiang Wang , Jianshe Chen , Binchuan Li , Qing Han , Kuiren Liu , Shicheng Wei
Constructing the magnetic/dielectric synergistic effect between ferrite and carbon materials is an important strategy to obtain microwave absorbers. ZnFe2O4 and graphite intercalation compounds (GICs) are creatively combined by high-temperature mechanochemical technology. The results show that ZnFe2O4 is attached to the surface and pores of graphite with special three-dimensional structure, the propagation path of microwaves in the composites can be extended, and polarization effects and magnetic loss of ZnFe2O4/C composites can be effectively enhanced. When the addition amounts of GICs is 10 wt%, the reflection loss (RL) of ZnFe2O4/C composite reaches −41.49 dB at a thickness of 4.5 mm, and the effective absorption bandwidth (EAB) reaches 3.92 GHz at a thickness of only 1.5 mm. This work provides a new idea for the synthesis of ZnFe2O4/C microwave absorbers agent by high-temperature mechanochemical technology.
{"title":"The microwave absorption performance of ZnFe2O4/C composites synthesized by high-temperature mechanochemical technology with graphite intercalation compounds","authors":"Boshuo Shi , Bo Wang , Yujiang Wang , Jianshe Chen , Binchuan Li , Qing Han , Kuiren Liu , Shicheng Wei","doi":"10.1016/j.materresbull.2024.113263","DOIUrl":"10.1016/j.materresbull.2024.113263","url":null,"abstract":"<div><div>Constructing the magnetic/dielectric synergistic effect between ferrite and carbon materials is an important strategy to obtain microwave absorbers. ZnFe<sub>2</sub>O<sub>4</sub> and graphite intercalation compounds (GICs) are creatively combined by high-temperature mechanochemical technology. The results show that ZnFe<sub>2</sub>O<sub>4</sub> is attached to the surface and pores of graphite with special three-dimensional structure, the propagation path of microwaves in the composites can be extended, and polarization effects and magnetic loss of ZnFe<sub>2</sub>O<sub>4</sub>/C composites can be effectively enhanced. When the addition amounts of GICs is 10 wt%, the reflection loss (RL) of ZnFe<sub>2</sub>O<sub>4</sub>/C composite reaches −41.49 dB at a thickness of 4.5 mm, and the effective absorption bandwidth (EAB) reaches 3.92 GHz at a thickness of only 1.5 mm. This work provides a new idea for the synthesis of ZnFe<sub>2</sub>O<sub>4</sub>/C microwave absorbers agent by high-temperature mechanochemical technology.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"184 ","pages":"Article 113263"},"PeriodicalIF":5.3,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143159252","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 : 2024-12-10DOI: 10.1016/j.materresbull.2024.113249
Asha Shalini V J , Johnsi M , Azhagulakshmi M , Dhivya S , Balasubramanian N
Yes, we are moving forward with the lithium ion batteries taking over the energy storage market. But, have we made them safer yet? This is indeed a point, that solid-state electrolytes (SSE) could shield the battery system from its vulnerability to catch fire. And they are to be on par with the liquid electrolytes at length, in terms of ionic conductivity, ion transfer and interfacial contact, which makes them the hotspot of lithium ion battery research. With shifting trend towards next-gen Lithium-Sulfur (Li-S) batteries, all solid state Li-S battery is focused on overcoming their inutile cycle life that comes with sulfur's offbeat conversion chemistry. In the modern era of risk-free battery, we have put our interest and attention together as an encyclopaedic review on the solid-state electrolyte in Li-S batteries to the history, mechanism, unique pathways of ionic conduction in SSE types and challenges that need immersive research.
{"title":"A review on solid-state electrolytes for Li-S batteries: Encompassing background to recent advancements","authors":"Asha Shalini V J , Johnsi M , Azhagulakshmi M , Dhivya S , Balasubramanian N","doi":"10.1016/j.materresbull.2024.113249","DOIUrl":"10.1016/j.materresbull.2024.113249","url":null,"abstract":"<div><div>Yes, we are moving forward with the lithium ion batteries taking over the energy storage market. But, have we made them safer yet? This is indeed a point, that solid-state electrolytes (SSE) could shield the battery system from its vulnerability to catch fire. And they are to be on par with the liquid electrolytes at length, in terms of ionic conductivity, ion transfer and interfacial contact, which makes them the hotspot of lithium ion battery research. With shifting trend towards next-gen Lithium-Sulfur (Li-S) batteries, all solid state Li-S battery is focused on overcoming their inutile cycle life that comes with sulfur's offbeat conversion chemistry. In the modern era of risk-free battery, we have put our interest and attention together as an encyclopaedic review on the solid-state electrolyte in Li-S batteries to the history, mechanism, unique pathways of ionic conduction in SSE types and challenges that need immersive research.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"184 ","pages":"Article 113249"},"PeriodicalIF":5.3,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143158762","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}
SrBi6-xBaxNb2Ti3O21 (x = 0.04,0.06,0.08) intergrowth Aurivillius ceramics were prepared using a solid-state reaction route. XRD data and Raman spectroscopy revealed a single-phase orthorhombic structure (‘I2cm’), showing that the Ba2+ dopant successfully entered the SrBi6Nb2Ti3O21 lattice. Rietveld analysis showed the addition of Ba2+ impacts the lattice symmetry of the structure. SEM micrographs showcase typical plate-like morphology of average size ∼2.63–3.50 μm. The dielectric investigations (RT-450 °C) revealed relaxor behavior with a decrease in the transition temperature and dielectric losses with an increase in doping concentration. The overall electrical response such as grain resistance, grain boundary resistance, and activation energy due to relaxation have been calculated using EIS. The Ea(Cond) increases with increasing Ba doping, indicating lower defect sites as corroborated through XPS analysis. Meanwhile, the ferroelectric loops indicate good saturation among Ba-doped ceramics and increased 2Pr values up to 1.02 μC/cm2 for x = 0.08. These insights will influence investigations on relaxor Aurivillius intergrowth ceramics.
{"title":"Enhanced ferroelectric behavior in Ba-modified SrBi6Nb2Ti3O21 intergrowth Aurivillius phases","authors":"Astha Sharma , Hemant Borakh , Pranat Jain , Oroosa Subohi","doi":"10.1016/j.materresbull.2024.113261","DOIUrl":"10.1016/j.materresbull.2024.113261","url":null,"abstract":"<div><div>SrBi<sub>6-x</sub>Ba<sub>x</sub>Nb<sub>2</sub>Ti<sub>3</sub>O<sub>21</sub> (<em>x</em> = 0.04,0.06,0.08) intergrowth Aurivillius ceramics were prepared using a solid-state reaction route. XRD data and Raman spectroscopy revealed a single-phase orthorhombic structure (<em>‘I2cm’</em>), showing that the Ba<sup>2+</sup> dopant successfully entered the SrBi<sub>6</sub>Nb<sub>2</sub>Ti<sub>3</sub>O<sub>21</sub> lattice. Rietveld analysis showed the addition of Ba<sup>2+</sup> impacts the lattice symmetry of the structure. SEM micrographs showcase typical plate-like morphology of average size ∼2.63–3.50 μm. The dielectric investigations (RT-450 °C) revealed relaxor behavior with a decrease in the transition temperature and dielectric losses with an increase in doping concentration. The overall electrical response such as grain resistance, grain boundary resistance, and activation energy due to relaxation have been calculated using EIS. The E<sub>a</sub>(Cond) increases with increasing Ba doping, indicating lower defect sites as corroborated through XPS analysis. Meanwhile, the ferroelectric loops indicate good saturation among Ba-doped ceramics and increased 2P<sub>r</sub> values up to 1.02 μC/cm<sup>2</sup> for <em>x</em> = 0.08. These insights will influence investigations on relaxor Aurivillius intergrowth ceramics.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"184 ","pages":"Article 113261"},"PeriodicalIF":5.3,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143159248","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 : 2024-12-10DOI: 10.1016/j.materresbull.2024.113262
Ammar M. Tighezza , Iram Manzoor , Abdul Ghafoor Abid , Zobia Siddique , Abdul Rasheed Rashid , Jafar Hussain Shah , Suleyman I. Allakhverdiev
Hydrogen produced from water has become a competitive substitute for fossil fuels. Numerous materials have been studied in this area as electrocatalysts for the production of clean hydrogen. In present work, we propose a hydrothermal method to synthesize the Ag-MoS2 for both oxygen evolution process (OER) plus hydrogen evolution process (HER). Furthermore, electrochemical impedance spectroscopy (EIS), linear sweep voltammetry (LSV), and cyclic voltammetry (CV) tests were performed in an alkaline electrolyte to assess the electrochemical performance. The Ag-MoS2 has an overpotential of 280 mV, 262 mV for OER and HER, correspondingly. Moreover, the Ag-MoS2 exhibits a lower Tafel slope of 53.8, and 112 mV dec−1 for OER and HER, compatibly. On the other hand, chronoamperometry tests validated the stability of synthesized Ag-MoS2. Hence, the peculiar and outstanding properties of Ag-MoS2 make it a promising candidate for next-generation electrochemical energy applications.
{"title":"Fabrication of excellent and novel flowery Ag-MoS2 electrocatalyst: As a high-efficiency for water oxidation","authors":"Ammar M. Tighezza , Iram Manzoor , Abdul Ghafoor Abid , Zobia Siddique , Abdul Rasheed Rashid , Jafar Hussain Shah , Suleyman I. Allakhverdiev","doi":"10.1016/j.materresbull.2024.113262","DOIUrl":"10.1016/j.materresbull.2024.113262","url":null,"abstract":"<div><div>Hydrogen produced from water has become a competitive substitute for fossil fuels. Numerous materials have been studied in this area as electrocatalysts for the production of clean hydrogen. In present work, we propose a hydrothermal method to synthesize the Ag-MoS<sub>2</sub> for both oxygen evolution process (OER) plus hydrogen evolution process (HER). Furthermore, electrochemical impedance spectroscopy (EIS), linear sweep voltammetry (LSV), and cyclic voltammetry (CV) tests were performed in an alkaline electrolyte to assess the electrochemical performance. The Ag-MoS<sub>2</sub> has an overpotential of 280 mV, 262 mV for OER and HER, correspondingly. Moreover, the Ag-MoS<sub>2</sub> exhibits a lower Tafel slope of 53.8, and 112 mV dec<sup>−1</sup> for OER and HER, compatibly. On the other hand, chronoamperometry tests validated the stability of synthesized Ag-MoS<sub>2</sub>. Hence, the peculiar and outstanding properties of Ag-MoS<sub>2</sub> make it a promising candidate for next-generation electrochemical energy applications.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"184 ","pages":"Article 113262"},"PeriodicalIF":5.3,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143159249","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 : 2024-12-09DOI: 10.1016/j.materresbull.2024.113254
Xinhao Guo , Fujun Zhang , Kang Liu , Mingshun Kong , Yongqi Liu , Ping Chen , Yu Zhang
Perovskite light-emitting diodes (PeLEDs) hold great promise to achieve next-generation lighting technologies and the display industry due to their excellent properties such as high efficiency, and high color purity. However, limited by the preparation process, all-perovskite white LEDs (WLEDs) are still a huge challenge, hindering the commercialization of PeLEDs. Herein, a perovskite/organic hybrid WLED integrated with perovskite and organic units, employing the multi-emitting layer structure which can modulate the exciton recombination region by varying the thickness of the organic unit, is demonstrated. As a result, the perovskite/organic hybrid WLED realizes the highest external quantum efficiency (EQE) of 13.54 % and luminance of 28,503 cd/m2 at 4 nm organic unit, and the corresponding flexible WLED demonstrates a luminance of 17,505 cd/m2 and EQE of 7.92 %. This strategy offers a simple and efficient method for achieving the perovskite-based white electroluminescent emission, which paves the way for the fabricating the highly efficient perovskite WLEDs.
{"title":"Bright and high-efficiency hybrid perovskite/organic white light-emitting diodes","authors":"Xinhao Guo , Fujun Zhang , Kang Liu , Mingshun Kong , Yongqi Liu , Ping Chen , Yu Zhang","doi":"10.1016/j.materresbull.2024.113254","DOIUrl":"10.1016/j.materresbull.2024.113254","url":null,"abstract":"<div><div>Perovskite light-emitting diodes (PeLEDs) hold great promise to achieve next-generation lighting technologies and the display industry due to their excellent properties such as high efficiency, and high color purity. However, limited by the preparation process, all-perovskite white LEDs (WLEDs) are still a huge challenge, hindering the commercialization of PeLEDs. Herein, a perovskite/organic hybrid WLED integrated with perovskite and organic units, employing the multi-emitting layer structure which can modulate the exciton recombination region by varying the thickness of the organic unit, is demonstrated. As a result, the perovskite/organic hybrid WLED realizes the highest external quantum efficiency (EQE) of 13.54 % and luminance of 28,503 cd/m<sup>2</sup> at 4 nm organic unit, and the corresponding flexible WLED demonstrates a luminance of 17,505 cd/m<sup>2</sup> and EQE of 7.92 %. This strategy offers a simple and efficient method for achieving the perovskite-based white electroluminescent emission, which paves the way for the fabricating the highly efficient perovskite WLEDs.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"184 ","pages":"Article 113254"},"PeriodicalIF":5.3,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143158823","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 : 2024-12-09DOI: 10.1016/j.materresbull.2024.113256
Fabiano R. Praxedes , Marcos A.L. Nobre , Silvania Lanfredi , Po S. Poon , Juan Matos
A key challenge in photocatalytic pollutant degradation lies in enhancing the efficiency of perovskite-based catalysts prepared under mild experimental conditions. The incorporation of tungsten (W) into nanostructured hollow particles of alkali niobates was studied as a strategy to improve photocatalytic activity. X-ray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), N2 adsorption/desorption isotherms, Raman and UV–Vis spectroscopies confirmed the successful formation of W-doped K0.5Na0.5NbO3 hollow spherical particles with a monoclinic perovskite structure. Detailed analysis by Rietveld refinement revealed improved octahedral distortion induced by W doping. The photocatalytic activity was evaluated using the molecular density of adsorbed azo dye and the first-order apparent rate-constant, revealing that W-doped samples demonstrated significantly higher activity (3.31×10–2 molecules·nm–2·min–1) compared to the host structure (1.05×10–2 molecules·nm–2·min–1). Based on scavenger tests and mass spectroscopy analysis, a mechanism for the photocatalytic oxidation of the azo dye is proposed.
{"title":"Influence of the structural properties and W/Nb ratio upon the photocatalytic activity of tungsten-doped potassium sodium niobate-based perovskites","authors":"Fabiano R. Praxedes , Marcos A.L. Nobre , Silvania Lanfredi , Po S. Poon , Juan Matos","doi":"10.1016/j.materresbull.2024.113256","DOIUrl":"10.1016/j.materresbull.2024.113256","url":null,"abstract":"<div><div>A key challenge in photocatalytic pollutant degradation lies in enhancing the efficiency of perovskite-based catalysts prepared under mild experimental conditions. The incorporation of tungsten (W) into nanostructured hollow particles of alkali niobates was studied as a strategy to improve photocatalytic activity. X-ray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), N<sub>2</sub> adsorption/desorption isotherms, Raman and UV–Vis spectroscopies confirmed the successful formation of W-doped K<sub>0.5</sub>Na<sub>0.5</sub>NbO<sub>3</sub> hollow spherical particles with a monoclinic perovskite structure. Detailed analysis by Rietveld refinement revealed improved octahedral distortion induced by W doping. The photocatalytic activity was evaluated using the molecular density of adsorbed azo dye and the first-order apparent rate-constant, revealing that W-doped samples demonstrated significantly higher activity (3.31×10<sup>–2</sup> molecules·nm<sup>–2</sup>·min<sup>–1</sup>) compared to the host structure (1.05×10<sup>–2</sup> molecules·nm<sup>–2</sup>·min<sup>–1</sup>). Based on scavenger tests and mass spectroscopy analysis, a mechanism for the photocatalytic oxidation of the azo dye is proposed.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"184 ","pages":"Article 113256"},"PeriodicalIF":5.3,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143159244","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 : 2024-12-09DOI: 10.1016/j.materresbull.2024.113259
Yugesh Singh Thakur , Aman Deep Acharya , Sakshi Sharma , Muzahir Iqbal , Sagar Bisoyi , Amisha , Bhawna
The physical and morphological features of materials play a key function in the electrochemical performance of supercapacitor electrodes, prompting extensive research into optimizing electrode material morphology. This investigation explores the effects of various solvents ethylene glycol (EG), diethylene glycol (DEG), and triethylene glycol (TEG) on the fabrication of BiOCl using a solvothermal method, focusing on the electrochemical, structural, and morphological characteristics of the resulting nanostructures. Notably, the BiOCl electrode synthesized with triethylene glycol (BT) exhibits a marigold flower-like morphology adorned with nanosheets, improving surface area and enriching electrical conductivity. Consequently, BT demonstrates a superior specific capacity of 665 C/g at 0.5 A/g, alongside impressive rate competence. In addition, a supercapacitor device using a BT//BT configuration was erected, showcasing an extreme energy density of 15.6 Wh/kg at 838 W/kg power density. The device maintained commendable cyclic stability, retaining approximately 78 % of its specific capacity and 83 % of its coulombic competence after 5000 cycles. Practical application was validated by powering a red LED, underscoring the potential of BT electrodes for energy storage applications. This study offers an effective synthesis method for high-performance BiOCl electrodes and emphasizes the influence of solvents on morphology and charge storage mechanisms. These findings provide valuable insights for future advancements in BiOCl and other metal oxide materials for energy storage applications.
{"title":"Optimizing solvent mixtures to boost the electrochemical performance of BiOCl for supercapacitor applications","authors":"Yugesh Singh Thakur , Aman Deep Acharya , Sakshi Sharma , Muzahir Iqbal , Sagar Bisoyi , Amisha , Bhawna","doi":"10.1016/j.materresbull.2024.113259","DOIUrl":"10.1016/j.materresbull.2024.113259","url":null,"abstract":"<div><div>The physical and morphological features of materials play a key function in the electrochemical performance of supercapacitor electrodes, prompting extensive research into optimizing electrode material morphology. This investigation explores the effects of various solvents ethylene glycol (EG), diethylene glycol (DEG), and triethylene glycol (TEG) on the fabrication of BiOCl using a solvothermal method, focusing on the electrochemical, structural, and morphological characteristics of the resulting nanostructures. Notably, the BiOCl electrode synthesized with triethylene glycol (BT) exhibits a marigold flower-like morphology adorned with nanosheets, improving surface area and enriching electrical conductivity. Consequently, BT demonstrates a superior specific capacity of 665 C/g at 0.5 A/g, alongside impressive rate competence. In addition, a supercapacitor device using a BT//BT configuration was erected, showcasing an extreme energy density of 15.6 Wh/kg at 838 W/kg power density. The device maintained commendable cyclic stability, retaining approximately 78 % of its specific capacity and 83 % of its coulombic competence after 5000 cycles. Practical application was validated by powering a red LED, underscoring the potential of BT electrodes for energy storage applications. This study offers an effective synthesis method for high-performance BiOCl electrodes and emphasizes the influence of solvents on morphology and charge storage mechanisms. These findings provide valuable insights for future advancements in BiOCl and other metal oxide materials for energy storage applications.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"184 ","pages":"Article 113259"},"PeriodicalIF":5.3,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143159250","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}
Thermoelectric materials based on cobalt-containing SiGe alloy films were fabricated using monocrystalline silicon wafers with thin porous silicon layers electrochemically decorated with cobalt nanoparticles, filled germanium and subsequently subjected to rapid thermal processing. SEM, XRD, Raman spectroscopy and measurements of electrical conductivity and thermoelectric parameters revealed that an intermediate silicidization step involving thermal processing at 850 °C after cobalt deposition is crucial to maximize the resulting alloy's thermoelectric capabilities. The obtained silicidized SiGe:Co samples demonstrate a Seebeck coefficient of -450 μV/K and an estimated figure-of-merit ZT value of up to 0.72 at 450 K due to the presence of crystalline cobalt silicides in the film. These results enable a new approach to the fabrication of thin film thermoelectric materials based on SiGe alloys.
{"title":"Thermoelectric materials based on cobalt-containing sintered silicon-germanium alloys","authors":"Nikita Grevtsov , Eugene Chubenko , Vitaly Bondarenko , Ilya Gavrilin , Alexey Dronov , Sergey Gavrilov , Dmitry Goroshko , Olga Goroshko , Grigory Rymski , Kazimir Yanushkevich","doi":"10.1016/j.materresbull.2024.113258","DOIUrl":"10.1016/j.materresbull.2024.113258","url":null,"abstract":"<div><div>Thermoelectric materials based on cobalt-containing SiGe alloy films were fabricated using monocrystalline silicon wafers with thin porous silicon layers electrochemically decorated with cobalt nanoparticles, filled germanium and subsequently subjected to rapid thermal processing. SEM, XRD, Raman spectroscopy and measurements of electrical conductivity and thermoelectric parameters revealed that an intermediate silicidization step involving thermal processing at 850 °C after cobalt deposition is crucial to maximize the resulting alloy's thermoelectric capabilities. The obtained silicidized SiGe:Co samples demonstrate a Seebeck coefficient of -450 μV/K and an estimated figure-of-merit ZT value of up to 0.72 at 450 K due to the presence of crystalline cobalt silicides in the film. These results enable a new approach to the fabrication of thin film thermoelectric materials based on SiGe alloys.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"184 ","pages":"Article 113258"},"PeriodicalIF":5.3,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143159247","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 : 2024-12-08DOI: 10.1016/j.materresbull.2024.113257
Yukun Huang , Xiaolei Chen , Zeying Wang , Biao Fu , Jiang Liu , Weijun Peng , Yijun Cao , Mingzhen Hu
Electromagnetic pollution does great harm to human health, production, and national security. Electromagnetic wave (EMW) absorption materials are the most promising way to solve electromagnetic pollution. Cobalt oxide-based absorbers have been widely studied because of their rich dissipation and excellent absorption performance. Herein, we prepared MnCo2O4 absorber by a solid-state roasting method, and the surface of MnCo2O4 was coated with flake-like graphene by ball milling, then the MnCo2O4@Graphene composites with heterogeneous interface was successfully synthesized. The results of XRD, SEM and TEM show that the spinel MnCo2O4 with high crystallinity, and the crystal lattice structure and surface morphology of MnCo2O4 can be improved by ball milling process, the EMW absorption capacity can be significantly enhanced. The synergy of MnCo2O4 and graphene in composites had better incidence and impedance matching, the reflection loss(RL) value is -40.2 dB at 5.8 GHz when the thickness is 4.0 mm.
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