Pub Date : 2025-02-14DOI: 10.1016/j.materresbull.2025.113375
Yuchun Huan , Junhua Sheng , Jin Bai , Junping Wang , Yue Dong , Huilong Tao , Min Wang
CVD-grown continuous graphene films are promising candidates as transparent electrodes. Although pristine graphene films have high breaking strength, they are still prone to ripping after tensile bending or stretching, which affects their electrical conductivity negatively. Here, we prepared nanoarchitectonics with stacked CVD-grown graphene sheets for transparent conductive films. While possessing ultra-flexibility, their conductivity and optical transparence have no gap between those of CVD-grown continuous graphene films with a sheet resistance of 108 Ω sq−1 at 89.93 % transmittance. The electromechanical bendability and stretchability of stacked graphene sheets is larger than 30 % and up to 20 %, respectively. In contrast, the electromechanical bendability and stretchability of continuous graphene films is only 10 %. Our experiment results show that a large number of edges in graphene sheets would generate massive strain release, which causes much less crack density in each layer of graphene sheets. Therefore, the stacked graphene sheets have more stable electromechanical behavior.
{"title":"Nanoarchitectonics with stacked CVD-grown graphene sheets for high-performance ultra-flexible transparent conductive films","authors":"Yuchun Huan , Junhua Sheng , Jin Bai , Junping Wang , Yue Dong , Huilong Tao , Min Wang","doi":"10.1016/j.materresbull.2025.113375","DOIUrl":"10.1016/j.materresbull.2025.113375","url":null,"abstract":"<div><div>CVD-grown continuous graphene films are promising candidates as transparent electrodes. Although pristine graphene films have high breaking strength, they are still prone to ripping after tensile bending or stretching, which affects their electrical conductivity negatively. Here, we prepared nanoarchitectonics with stacked CVD-grown graphene sheets for transparent conductive films. While possessing ultra-flexibility, their conductivity and optical transparence have no gap between those of CVD-grown continuous graphene films with a sheet resistance of 108 Ω sq<sup>−1</sup> at 89.93 % transmittance. The electromechanical bendability and stretchability of stacked graphene sheets is larger than 30 % and up to 20 %, respectively. In contrast, the electromechanical bendability and stretchability of continuous graphene films is only 10 %. Our experiment results show that a large number of edges in graphene sheets would generate massive strain release, which causes much less crack density in each layer of graphene sheets. Therefore, the stacked graphene sheets have more stable electromechanical behavior.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"187 ","pages":"Article 113375"},"PeriodicalIF":5.3,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143429187","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 : 2025-02-13DOI: 10.1016/j.materresbull.2025.113357
Vuong Dinh Trung , Weili Zhao , Phuoc-Anh Le , Yinjia Zhang , Yanyan Sun , Jun Natsuki , Jing Tan , Weimin Yang , Toshiaki Natsuki
The development of flexible and compressible multifunctional sensors for integration into artificial intelligence systems represents a critical advancement in next-generation electronics. This study introduces a cost-effective method for fabricating a compressible, humidity-sensitive conductive sponge applied for dual pressure-humidity sensing. The multifunctional sensor is based on novel poly(vinyl alcohol)/phosphoric acid/Ni-Al layered double hydroxide@melamine (PVA/HP/Ni-Al LDH@ME) sponges, developed via a multi-step dip-coating process. It provides two main functions: compressive junction sensing, which detects minute motion due to an increase in conductive pathways under pressure, with gauge factors from 1.08−5.72 over a 0 − 85 % strain range and high sensitivity (0.09−15.37 kPa–1); and humidity sensing based on moisture-induced potential (∼0.5 V) generated by hydroxyl gradients and water diffusion within its porous structure. The iontronic sensor shows potential for on-site detection of human body deformations, humidity-responsive electronic skin, wearable breathing monitors, as well as dual pressure-humidity energy harvesting, thereby advancing multifunctional wearables for artificial intelligence applications.
{"title":"Iontronic dual pressure-humidity sensor based on poly(vinyl alcohol)/phosphoric acid/Ni-Al layered double hydroxide hydrogel@melamine sponge for advanced wearable electronics","authors":"Vuong Dinh Trung , Weili Zhao , Phuoc-Anh Le , Yinjia Zhang , Yanyan Sun , Jun Natsuki , Jing Tan , Weimin Yang , Toshiaki Natsuki","doi":"10.1016/j.materresbull.2025.113357","DOIUrl":"10.1016/j.materresbull.2025.113357","url":null,"abstract":"<div><div>The development of flexible and compressible multifunctional sensors for integration into artificial intelligence systems represents a critical advancement in next-generation electronics. This study introduces a cost-effective method for fabricating a compressible, humidity-sensitive conductive sponge applied for dual pressure-humidity sensing. The multifunctional sensor is based on novel poly(vinyl alcohol)/phosphoric acid/Ni-Al layered double hydroxide@melamine (PVA/HP/Ni-Al LDH@ME) sponges, developed via a multi-step dip-coating process. It provides two main functions: compressive junction sensing, which detects minute motion due to an increase in conductive pathways under pressure, with gauge factors from 1.08−5.72 over a 0 − 85 % strain range and high sensitivity (0.09−15.37 kPa<sup>–1</sup>); and humidity sensing based on moisture-induced potential (∼0.5 V) generated by hydroxyl gradients and water diffusion within its porous structure. The iontronic sensor shows potential for on-site detection of human body deformations, humidity-responsive electronic skin, wearable breathing monitors, as well as dual pressure-humidity energy harvesting, thereby advancing multifunctional wearables for artificial intelligence applications.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"186 ","pages":"Article 113357"},"PeriodicalIF":5.3,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403393","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 : 2025-02-13DOI: 10.1016/j.materresbull.2025.113374
Li Ping Tan , Karl P. Davidson , Mehmet Cagirici , Xuesong Xu , Shakti P. Padhy , V. Chaudhary , R.V. Ramanujan
Next generation magnetic materials used in high frequency rotating electrical machines, e.g., motors, require a good balance of magnetic, electrical and mechanical properties. Pure Fe has good magnetic properties but has insufficient resistivity and strength. Adding Cu to Fe can improve resistivity and strength. In this work, Fe-xCu (x = 1 to 4 wt %) alloys were studied. The Cu content was restricted to a maximum of 4 wt % to minimize detrimental effects to the magnetic properties. The mechanical properties were investigated using profilometry-based indentation plastometry (PIP) and micro tensile tests. A desirable doubling of yield strength and ultimate tensile strength was observed with increasing Cu content, from 317 to 801 MPa and 417 to ∼888 MPa respectively in tensile tests. Microhardness correspondingly increased from ∼225.7 to ∼368.2 HV. There was a three-fold increase in resistivity to ∼28 to 30 µm.cm, as compared to Fe, while Ms, Hc and Tc were in the range of 204 to 210.6 emu/g, 5.6 to 6.1 Oe and 758 to 762 °C, respectively. These alloys exhibit the desired good balance of magnetic, mechanical and electrical properties. Our results show that low Cu content Fe-Cu binary alloys are promising low-cost materials for next-generation electrical machines.
{"title":"Multi-property evaluation of low Cu content Fe-Cu magnetic alloys","authors":"Li Ping Tan , Karl P. Davidson , Mehmet Cagirici , Xuesong Xu , Shakti P. Padhy , V. Chaudhary , R.V. Ramanujan","doi":"10.1016/j.materresbull.2025.113374","DOIUrl":"10.1016/j.materresbull.2025.113374","url":null,"abstract":"<div><div>Next generation magnetic materials used in high frequency rotating electrical machines, e.g., motors, require a good balance of magnetic, electrical and mechanical properties. Pure Fe has good magnetic properties but has insufficient resistivity and strength. Adding Cu to Fe can improve resistivity and strength. In this work, Fe-xCu (<em>x</em> = 1 to 4 wt %) alloys were studied. The Cu content was restricted to a maximum of 4 wt % to minimize detrimental effects to the magnetic properties. The mechanical properties were investigated using profilometry-based indentation plastometry (PIP) and micro tensile tests. A desirable doubling of yield strength and ultimate tensile strength was observed with increasing Cu content, from 317 to 801 MPa and 417 to ∼888 MPa respectively in tensile tests. Microhardness correspondingly increased from ∼225.7 to ∼368.2 HV. There was a three-fold increase in resistivity to <strong>∼</strong>28 to 30 µm.cm, as compared to Fe, while <em>M<sub>s</sub>, H<sub>c</sub></em> and <em>T<sub>c</sub></em> were in the range of 204 to 210.6 emu/g<em>,</em> 5.6 to 6.1 Oe and 758 to 762 °C, respectively. These alloys exhibit the desired good balance of magnetic, mechanical and electrical properties. Our results show that low Cu content Fe-Cu binary alloys are promising low-cost materials for next-generation electrical machines.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"187 ","pages":"Article 113374"},"PeriodicalIF":5.3,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436724","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}
We develop a novel 3D network-structured composite, denoted as rGO@C@SNT, wherein carbon-coated SiO2 nanotubes (C@SNT) are integrated onto reduced graphene oxide (rGO). The synergistic effects of this composite provide both structural and interfacial stability during the lithiation/delithiation processes, while the carbon layer effectively improves mechanical stress and enhances conductivity. As a result, the rGO@C@SNT exhibits higher cyclic capacity, lower electrochemical impedance, and stronger charge transfer capability. Specifically, we show that the rGO@C@SNT composite maintains a high capacity of 826 mAh g-1 after 200 cycles with a capacity retention rate of 100 %. The unique 3D network enhances the mobility of Li+ ions and electrons, and provides the contact between the electrolyte and the active sites, thereby improving the battery performance. These findings underscore the significant potential of the rGO@C@SNT composite in advancing LIBs technology, offering a sustainable solution for next-generation energy storage systems.
{"title":"A 3D network of carbon-coated SiO2 nanotubes on reduced graphene oxide for high-performance lithium-ion battery anodes","authors":"Hanlu Xu , Rui Yu , Qiong Zhang , Qi Zhou , Bo Liu , Zihan Zhou , Yuan Gao , Rongli Jiang","doi":"10.1016/j.materresbull.2025.113366","DOIUrl":"10.1016/j.materresbull.2025.113366","url":null,"abstract":"<div><div>We develop a novel 3D network-structured composite, denoted as rGO@C@SNT, wherein carbon-coated SiO<sub>2</sub> nanotubes (C@SNT) are integrated onto reduced graphene oxide (rGO). The synergistic effects of this composite provide both structural and interfacial stability during the lithiation/delithiation processes, while the carbon layer effectively improves mechanical stress and enhances conductivity. As a result, the rGO@C@SNT exhibits higher cyclic capacity, lower electrochemical impedance, and stronger charge transfer capability. Specifically, we show that the rGO@C@SNT composite maintains a high capacity of 826 mAh g<sup>-1</sup> after 200 cycles with a capacity retention rate of 100 %. The unique 3D network enhances the mobility of Li<sup>+</sup> ions and electrons, and provides the contact between the electrolyte and the active sites, thereby improving the battery performance. These findings underscore the significant potential of the rGO@C@SNT composite in advancing LIBs technology, offering a sustainable solution for next-generation energy storage systems.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"186 ","pages":"Article 113366"},"PeriodicalIF":5.3,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403394","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 : 2025-02-10DOI: 10.1016/j.materresbull.2025.113355
Jiaming Li , Lunbin Xia , Yu Liu , Zhuwei Gu , Huasong Liang , Xuteng Wu , Zixuan Qian , Sihang Ji , Jialong Zhao , Xi Yuan
It is crucial to obtain pure blue perovskite nanocrystals (NCs) with high photoluminescence quantum yield (PL QY) and good stability. This work focuses on optimizing the luminescence properties of CsPbBr3 NCs through the introduction of Cd2+, aiming to achieve stable and efficient pure blue perovskite NCs. By employing an improved hot-injection method, we successfully synthesized alloyed CsPb1-xCdxBr3 NCs. The introduction of Cd2+ not only significantly tunes the bandgap of the NCs, realizing a blueshift in the emission wavelength, but also enhances the PL QY and stability of the NCs. Notably, the highest PL QY of 98% is achieved at a Cd/Pb molar ratio of 1:1. The changes in the luminescence properties of the NCs are attributed to lattice distortion induced by the incorporation of Cd2+, leading to a gradual transition from the CsPbBr3 phase to the Cs(Pb/Cd)Br3 and CsCdBr3 phases. The alloyed CsPb1-xCdxBr3 NCs exhibit a smaller temperature dependent bandgap variation rate and a larger exciton binding energy, improving the water and thermal stability. Finally, we fabricated blue light emitting diodes (LEDs) using the alloyed CsPb1-xCdxBr3 NCs, achieving a maximum external quantum efficiency of 1.95% and a maximum brightness of 489.44 cd/m2. This study provides a material foundation for developing high-performance blue LED devices.
{"title":"Optimizing luminescence performance of alloyed CsPb1−xCdxBr3 perovskite nanocrystals for blue light-emitting diodes","authors":"Jiaming Li , Lunbin Xia , Yu Liu , Zhuwei Gu , Huasong Liang , Xuteng Wu , Zixuan Qian , Sihang Ji , Jialong Zhao , Xi Yuan","doi":"10.1016/j.materresbull.2025.113355","DOIUrl":"10.1016/j.materresbull.2025.113355","url":null,"abstract":"<div><div>It is crucial to obtain pure blue perovskite nanocrystals (NCs) with high photoluminescence quantum yield (PL QY) and good stability. This work focuses on optimizing the luminescence properties of CsPbBr<sub>3</sub> NCs through the introduction of Cd<sup>2+</sup>, aiming to achieve stable and efficient pure blue perovskite NCs. By employing an improved hot-injection method, we successfully synthesized alloyed CsPb<sub>1-x</sub>Cd<sub>x</sub>Br<sub>3</sub> NCs. The introduction of Cd<sup>2+</sup> not only significantly tunes the bandgap of the NCs, realizing a blueshift in the emission wavelength, but also enhances the PL QY and stability of the NCs. Notably, the highest PL QY of 98% is achieved at a Cd/Pb molar ratio of 1:1. The changes in the luminescence properties of the NCs are attributed to lattice distortion induced by the incorporation of Cd<sup>2+</sup>, leading to a gradual transition from the CsPbBr<sub>3</sub> phase to the Cs(Pb/Cd)Br<sub>3</sub> and CsCdBr<sub>3</sub> phases. The alloyed CsPb<sub>1-x</sub>Cd<sub>x</sub>Br<sub>3</sub> NCs exhibit a smaller temperature dependent bandgap variation rate and a larger exciton binding energy, improving the water and thermal stability. Finally, we fabricated blue light emitting diodes (LEDs) using the alloyed CsPb<sub>1-x</sub>Cd<sub>x</sub>Br<sub>3</sub> NCs, achieving a maximum external quantum efficiency of 1.95% and a maximum brightness of 489.44 cd/m<sup>2</sup>. This study provides a material foundation for developing high-performance blue LED devices.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"186 ","pages":"Article 113355"},"PeriodicalIF":5.3,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395165","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 : 2025-02-09DOI: 10.1016/j.materresbull.2025.113353
M.R. Alfaro Cruz , Luis F. Garay-Rodríguez , Mayur A. Gaikwad , Jin Hyeok Kim , Leticia M. Torres-Martínez
To avoid ZnO photocorrosion, In-doped ZnO nanorods were grown using chemical bath deposition by varying the In concentration (0.5, 0.75, and 1 mol %). The increase in the In load enhanced the photocatalytic activity for hydrogen production, evolving 10 times more hydrogen in the ZnONRD/1-In (1 % In) sample compared to bare ZnO NRD, associated with larger presence of dislocations in this sample, which acted as electron traps. Unfortunately, the recyclability cycles indicated that this sample was not stable because its photoactivity decreased by 90 %. Despite this, it was observed that the ZnONRD/0.5-In film (0.5 % In) maintained constant its gas evolution, indicating good stability and possibly a photocorrosion suppression. This feature was confirmed with a long reaction time, reaching maximum hydrogen evolution at 48 h (up to 50 µmol). Similarly, hydrogen production was increased by a factor of 43 by adding Na2S/Na2SO3 as a sacrificial agent, confirming sample efficiency.
{"title":"Optimization of a thin film photocatalyst for hydrogen production: Effect of In-doping in ZnO photo-corrosion suppression","authors":"M.R. Alfaro Cruz , Luis F. Garay-Rodríguez , Mayur A. Gaikwad , Jin Hyeok Kim , Leticia M. Torres-Martínez","doi":"10.1016/j.materresbull.2025.113353","DOIUrl":"10.1016/j.materresbull.2025.113353","url":null,"abstract":"<div><div>To avoid ZnO photocorrosion, In-doped ZnO nanorods were grown using chemical bath deposition by varying the In concentration (0.5, 0.75, and 1 mol %). The increase in the In load enhanced the photocatalytic activity for hydrogen production, evolving 10 times more hydrogen in the ZnO<img>NRD/1-In (1 % In) sample compared to bare ZnO NRD, associated with larger presence of dislocations in this sample, which acted as electron traps. Unfortunately, the recyclability cycles indicated that this sample was not stable because its photoactivity decreased by 90 %. Despite this, it was observed that the ZnO<img>NRD/0.5-In film (0.5 % In) maintained constant its gas evolution, indicating good stability and possibly a photocorrosion suppression. This feature was confirmed with a long reaction time, reaching maximum hydrogen evolution at 48 h (up to 50 µmol). Similarly, hydrogen production was increased by a factor of 43 by adding Na<sub>2</sub>S/Na<sub>2</sub>SO<sub>3</sub> as a sacrificial agent, confirming sample efficiency.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"186 ","pages":"Article 113353"},"PeriodicalIF":5.3,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419140","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}
The introduction of protonated interlayers in layered perovskite compounds has already demonstrated promising results in terms of photocatalytic activity. However, the mechanisms behind the observed enhancements remain unexplored. Here, we report a rapid and efficient proton exchange process for Na0.5Bi2.5Nb2O9 (ABNO), involving selective leaching of (Bi2O2)2- layers accompanied by the introduction of interlayer H+. This process, using acid treatment at room temperature is completed within only 24 h, the fastest method to date for a layered perovskite. Protonation induces changes at the molecular and electronic level, investigated using Synchrotron-based techniques, diffused reflectance spectroscopy (DRS), DFT calculation, and transient absorption spectroscopy (TAS), influencing the electronic band structure, surface properties, and charge carrier dynamics of the compounds. After protonation, BET surface area increases by > 20 times, to 156.19 m2/g. These structural and surface modifications unlock the material's latent photocatalytic potential, enabling H+ exchanged Na0.5Bi2.5Nb2O9 (HABNO) to achieve a H2 production rate of 242 μmol/h/g. This work delves into the photocatalytic mechanism, revealing how substitution by H+ provides more active sites and enhances the ability of the material to generate more highly reactive electrons that can participate in H2O reduction. This study highlights the promising strategy of altering the structure and electronic properties of layered materials through protonation to improve their performance for applications in photocatalysis for a cleaner and more sustainable future.
{"title":"Insights into unlocking the latent photocatalytic H2 production activity in the protonated Aurivillius-phase layered perovskite Na0.5Bi2.5Nb2O9","authors":"Arreerat Jiamprasertboon , Andreas Kafizas , Tanachat Eknapakul , Thitipong Choklap , Justine Quinet , Wutthigrai Sailuam , Peng Jiang , Ratchadaporn Supruangnet , Supinya Nijpanich , Atipong Bootchanont , Upsorn Boonyang , Theeranun Siritanon , Thomas Cottineau","doi":"10.1016/j.materresbull.2025.113352","DOIUrl":"10.1016/j.materresbull.2025.113352","url":null,"abstract":"<div><div>The introduction of protonated interlayers in layered perovskite compounds has already demonstrated promising results in terms of photocatalytic activity. However, the mechanisms behind the observed enhancements remain unexplored. Here, we report a rapid and efficient proton exchange process for Na<sub>0.5</sub>Bi<sub>2.5</sub>Nb<sub>2</sub>O<sub>9</sub> (ABNO), involving selective leaching of (Bi<sub>2</sub>O<sub>2</sub>)<sup>2-</sup> layers accompanied by the introduction of interlayer <em>H</em><sup>+</sup>. This process, using acid treatment at room temperature is completed within only 24 h, the fastest method to date for a layered perovskite. Protonation induces changes at the molecular and electronic level, investigated using Synchrotron-based techniques, diffused reflectance spectroscopy (DRS), DFT calculation, and transient absorption spectroscopy (TAS), influencing the electronic band structure, surface properties, and charge carrier dynamics of the compounds. After protonation, BET surface area increases by > 20 times, to 156.19 m<sup>2</sup>/g. These structural and surface modifications unlock the material's latent photocatalytic potential, enabling <em>H</em><sup>+</sup> exchanged Na<sub>0.5</sub>Bi<sub>2.5</sub>Nb<sub>2</sub>O<sub>9</sub> (HABNO) to achieve a H<sub>2</sub> production rate of 242 μmol/h/g. This work delves into the photocatalytic mechanism, revealing how substitution by <em>H</em><sup>+</sup> provides more active sites and enhances the ability of the material to generate more highly reactive electrons that can participate in H<sub>2</sub>O reduction. This study highlights the promising strategy of altering the structure and electronic properties of layered materials through protonation to improve their performance for applications in photocatalysis for a cleaner and more sustainable future.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"186 ","pages":"Article 113352"},"PeriodicalIF":5.3,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419138","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 : 2025-02-08DOI: 10.1016/j.materresbull.2025.113350
Ashima Makhija, Sangeeta Kadyan, Manju Nain, Anil Ohlan, Sajjan Dahiya, R. Punia, A.S. Maan
The Ce³⁺-Sm³⁺ co-doped nanocomposite phosphors, MgO-La1-x-yCexSmyAlO3 (x = 0.009; y = 0 – 0.04), were synthesized via Pechini sol-gel method. XRD and Rietveld refinements corroborated the face-centered cubic crystal structure for MgO and rhombohedral structure for LaAlO₃. FESEM with EDAX revealed inhomogeneous grains with uniform elemental distribution. The optical bandgaps of the nanocomposites were found to range between 5.06 and 5.53 eV. Photoluminescence (PL) excitation and emission spectra, along with time-resolved PL, have been employed to investigate energy transfer behavior from Ce³⁺ to Sm³⁺. The energy transfer mechanism has been attributed to d-d interlinkages, with a transfer efficiency of ∼80% in the MgO-La0.951Ce0.009Sm0.04AlO3. The nanocomposite phosphor MgO-La0.961Ce0.009Sm0.03AlO3 exhibited maximum luminescence among the studied nanocomposites, even higher than the nanophosphor La0.961Ce0.009Sm0.03AlO3. Analysis of parameters, such as correlated color temperature (CCT) and CIE 1931 chromaticity coordinates, demonstrated its potential as a green-to-orange color-tunable cool phosphor, indicating its suitability for diverse photonic applications.
{"title":"Energy transfer in Ce-Sm co-doped in-situ synthesized nanocomposites: Unveiling structural, morphological and photoluminescent properties for enhanced luminescence","authors":"Ashima Makhija, Sangeeta Kadyan, Manju Nain, Anil Ohlan, Sajjan Dahiya, R. Punia, A.S. Maan","doi":"10.1016/j.materresbull.2025.113350","DOIUrl":"10.1016/j.materresbull.2025.113350","url":null,"abstract":"<div><div>The Ce³⁺-Sm³⁺ co-doped nanocomposite phosphors, MgO-La<sub>1-x-y</sub>Ce<sub>x</sub>Sm<sub>y</sub>AlO<sub>3</sub> (x = 0.009; y = 0 – 0.04), were synthesized via Pechini sol-gel method. XRD and Rietveld refinements corroborated the face-centered cubic crystal structure for MgO and rhombohedral structure for LaAlO₃. FESEM with EDAX revealed inhomogeneous grains with uniform elemental distribution. The optical bandgaps of the nanocomposites were found to range between 5.06 and 5.53 eV. Photoluminescence (PL) excitation and emission spectra, along with time-resolved PL, have been employed to investigate energy transfer behavior from Ce³⁺ to Sm³⁺. The energy transfer mechanism has been attributed to d-d interlinkages, with a transfer efficiency of ∼80% in the MgO-La<sub>0.951</sub>Ce<sub>0.009</sub>Sm<sub>0.04</sub>AlO<sub>3</sub>. The nanocomposite phosphor MgO-La<sub>0.961</sub>Ce<sub>0.009</sub>Sm<sub>0.03</sub>AlO<sub>3</sub> exhibited maximum luminescence among the studied nanocomposites, even higher than the nanophosphor La<sub>0.961</sub>Ce<sub>0.009</sub>Sm<sub>0.03</sub>AlO<sub>3</sub>. Analysis of parameters, such as correlated color temperature (CCT) and CIE 1931 chromaticity coordinates, demonstrated its potential as a green-to-orange color-tunable cool phosphor, indicating its suitability for diverse photonic applications.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"186 ","pages":"Article 113350"},"PeriodicalIF":5.3,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419139","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 : 2025-02-06DOI: 10.1016/j.materresbull.2025.113344
Hangxi Liu , Haorong Sun , Peng Zhao , Kangle Shang , Ming Fang , Xiaoli Tan , Long Yu , Bin Ma
Nitrite ions originate from various natural and anthropogenic sources and can cause health issues including methemoglobinemia and potential carcinogenic effects. As the nitrite in water has become an increasing threat to human health, the accurate evaluation of nitrite is urgently needed for environmental quality and safety management. In this paper, we designed a CTAB/SF5/GCE sensor, which exhibited an obvious enhancement compared to the pristine glassy carbon electrode (GCE). The morphology characterization confirmed the hexagonal nanosheets of SnS2 and the even distribution of Fe element. The energy band, Tafel plots, and EIS spectroscopy were employed to investigate the enhancement mechanism, demonstrating that improving charge transfer on the sensing interface is crucial in enhanced signals. Cyclic voltammetry (CV) was adopted as the electrochemical method to measure the nitrite in water and a sensitivity of 0.129 μA·μM−1 was exhibited in the range of 30–500 μM, and the limit of detection (LOD) was calculated to be 6.51 μM. The reliability including the repeatability, reproducibility, and stability of this sensor were estimated and showed satisfactory results. The test in real samples and the assessment of interfering substances showed the CTAB/SF5/GCE possesses a large potential in the practical application of electrochemical sensing of nitrite.
{"title":"Enhanced electrochemical detection of nitrite ions by CTAB-modified hexagonal Fe-doped SnS2 nanosheets in water","authors":"Hangxi Liu , Haorong Sun , Peng Zhao , Kangle Shang , Ming Fang , Xiaoli Tan , Long Yu , Bin Ma","doi":"10.1016/j.materresbull.2025.113344","DOIUrl":"10.1016/j.materresbull.2025.113344","url":null,"abstract":"<div><div>Nitrite ions originate from various natural and anthropogenic sources and can cause health issues including methemoglobinemia and potential carcinogenic effects. As the nitrite in water has become an increasing threat to human health, the accurate evaluation of nitrite is urgently needed for environmental quality and safety management. In this paper, we designed a CTAB/SF5/GCE sensor, which exhibited an obvious enhancement compared to the pristine glassy carbon electrode (GCE). The morphology characterization confirmed the hexagonal nanosheets of SnS<sub>2</sub> and the even distribution of Fe element. The energy band, Tafel plots, and EIS spectroscopy were employed to investigate the enhancement mechanism, demonstrating that improving charge transfer on the sensing interface is crucial in enhanced signals. Cyclic voltammetry (CV) was adopted as the electrochemical method to measure the nitrite in water and a sensitivity of 0.129 μA·μM<sup>−1</sup> was exhibited in the range of 30–500 μM, and the limit of detection (LOD) was calculated to be 6.51 μM. The reliability including the repeatability, reproducibility, and stability of this sensor were estimated and showed satisfactory results. The test in real samples and the assessment of interfering substances showed the CTAB/SF5/GCE possesses a large potential in the practical application of electrochemical sensing of nitrite.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"186 ","pages":"Article 113344"},"PeriodicalIF":5.3,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143372957","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 : 2025-02-06DOI: 10.1016/j.materresbull.2025.113348
Shruti Kaushik, Prakash Chand, Swati Sharma
The present work reported a sustainable zeolitic imidazolate framework-67 in redox additive electrolyte with ultrahigh capacitance and superior energy & power density as potential electrode materials for energy storage applications. The interest stems from its unique combination of desirable characteristics and reveals novel high-performance supercapacitors (SCs). The work employs redox additive electrolyte (RAE), specifically 0.08 M [K3(Fe(CN)6)] in 6 M KOH. When synthesized dodecahedral structured material was tested in a 3-electrode (3E) setup, it presented an ultrahigh specific capacitance (CS) of 8307.38 Fg-1 at a current density of 2 Ag-1 and a worthy cycling performance with 88.25% initial capacitance retention after 10,000 cycles. The asymmetric supercapacitor device (ASSC) fabricated shows impressive energy density (E), reaching 49.80 Whkg-1 at a current density of 4 Ag-1 with an exceptional CS of 917.83 Fg-1. Remarkably, it also delivers a high power density (P) of 1361.38 Wkg-1 at the same current density. The ASSC devices showed outstanding stability that stays almost 90% of the initial capacitance even after 10,000 charge-discharge cycles at an ultrahigh current density of 80 Ag-1 along with good columbic efficiency. The wide potential window, ranging from 0.0 to 1.6 V, further increases their potential applications. In essence, this work paves the way for a new generation of supercapacitors by combining electrodes with a tailored electrolyte, achieving exceptional E and P alongside remarkable stability.
{"title":"Nanoarchitectonics for ultrahigh capacitance with superior energy and power density of sustainable zeolitic imidazolate framework-67 in redox additive electrolyte","authors":"Shruti Kaushik, Prakash Chand, Swati Sharma","doi":"10.1016/j.materresbull.2025.113348","DOIUrl":"10.1016/j.materresbull.2025.113348","url":null,"abstract":"<div><div>The present work reported a sustainable zeolitic imidazolate framework-67 in redox additive electrolyte with ultrahigh capacitance and superior energy & power density as potential electrode materials for energy storage applications. The interest stems from its unique combination of desirable characteristics and reveals novel high-performance supercapacitors (SCs). The work employs redox additive electrolyte (RAE), specifically 0.08 M [K<sub>3</sub>(Fe(CN)<sub>6</sub>)] in 6 M KOH. When synthesized dodecahedral structured material was tested in a 3-electrode (3E) setup, it presented an ultrahigh specific capacitance (C<sub>S</sub>) of 8307.38 Fg<sup>-1</sup> at a current density of 2 Ag<sup>-1</sup> and a worthy cycling performance with 88.25% initial capacitance retention after 10,000 cycles. The asymmetric supercapacitor device (ASSC) fabricated shows impressive energy density (E), reaching 49.80 Whkg<sup>-1</sup> at a current density of 4 Ag<sup>-1</sup> with an exceptional C<sub>S</sub> of 917.83 Fg<sup>-1</sup>. Remarkably, it also delivers a high power density (P) of 1361.38 Wkg<sup>-1</sup> at the same current density. The ASSC devices showed outstanding stability that stays almost 90% of the initial capacitance even after 10,000 charge-discharge cycles at an ultrahigh current density of 80 Ag<sup>-1</sup> along with good columbic efficiency. The wide potential window, ranging from 0.0 to 1.6 V, further increases their potential applications. In essence, this work paves the way for a new generation of supercapacitors by combining electrodes with a tailored electrolyte, achieving exceptional E and P alongside remarkable stability.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"186 ","pages":"Article 113348"},"PeriodicalIF":5.3,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143386496","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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