Pub Date : 2025-12-06DOI: 10.1016/j.matlet.2025.139920
Tiqiang Pang , Guibao Wang , Miao Yu , Renxu Jia
A one-step high-pressure tabletting method was developed to directly prepare size and thickness controlled all-inorganic double perovskite Cs2NaInCl6 target. The improvement in the phase purity of the Cs2NaInCl6 target is attributed to natural wetting of the precursor powder and the tuning of the powder ratio during the grinding process. Interestingly, the Cs2NaInCl6 target has the property of warm white-light emission. The target annealing study found that the annealing temperature has a critical impact on the fluorescence intensity and the excitation peak position due to thermal effects will change the intensity of the [InCl6]3− vibration mode and energy levels. The optimized Cs2NaInCl6 targets obtained by annealing at 250 °C has supreme luminescence performance, with a PLQY of up to 21.3 %. Our method provides new insights into the larger-scale synthesis of perovskite targets and films.
{"title":"Lead-free double perovskite Cs2NaInCl6 targets through one-step high-pressure Tabletting method for warm white-light emission","authors":"Tiqiang Pang , Guibao Wang , Miao Yu , Renxu Jia","doi":"10.1016/j.matlet.2025.139920","DOIUrl":"10.1016/j.matlet.2025.139920","url":null,"abstract":"<div><div>A one-step high-pressure tabletting method was developed to directly prepare size and thickness controlled all-inorganic double perovskite Cs<sub>2</sub>NaInCl<sub>6</sub> target. The improvement in the phase purity of the Cs<sub>2</sub>NaInCl<sub>6</sub> target is attributed to natural wetting of the precursor powder and the tuning of the powder ratio during the grinding process. Interestingly, the Cs<sub>2</sub>NaInCl<sub>6</sub> target has the property of warm white-light emission. The target annealing study found that the annealing temperature has a critical impact on the fluorescence intensity and the excitation peak position due to thermal effects will change the intensity of the [InCl<sub>6</sub>]<sup>3−</sup> vibration mode and energy levels. The optimized Cs<sub>2</sub>NaInCl<sub>6</sub> targets obtained by annealing at 250 °C has supreme luminescence performance, with a PLQY of up to 21.3 %. Our method provides new insights into the larger-scale synthesis of perovskite targets and films.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"406 ","pages":"Article 139920"},"PeriodicalIF":2.7,"publicationDate":"2025-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145734034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-06DOI: 10.1016/j.matlet.2025.139923
Xiaolian Liu , Jianzhong Li , Weiyang Jin , Tinglan Wu , Zhenhua Zhang , Lianze Ji , Kai Zhong
Although incorporating a ductile FCC γ phase into the martensite matrix is known to enhance ductility in Ni-Fe-Ga ferromagnetic shape memory alloys, the nanoscale structural features of these precipitates and their correlation with mechanical properties remain unclear. In this study, we investigate the atomic-scale structures of solution-treated Ni50+xFe24-xGa26 (x = −1, 0, 2, 5) alloys. The microstructural analyses reveal that Ni-rich compositions promote a higher volume fraction of γ-phase precipitates. Atomic-scale characterization uncovers coherent γ’ nanoprecipitates within the γ phase. Nanoindentation shows increased hardness and enhanced strain recovery, illustrates significant interfacial strengthening effects at interface of two-phase region with Ni increase. These coherent nanostructures and interfacial strengthening are identified as key to the superior strength-ductility synergy, offering new mechanistic insights into precipitation strengthening in Ni-Fe-Ga alloys.
{"title":"Atomic-scale coherent precipitation and interfacial strengthening in Ni-Fe-Ga shape memory alloys","authors":"Xiaolian Liu , Jianzhong Li , Weiyang Jin , Tinglan Wu , Zhenhua Zhang , Lianze Ji , Kai Zhong","doi":"10.1016/j.matlet.2025.139923","DOIUrl":"10.1016/j.matlet.2025.139923","url":null,"abstract":"<div><div>Although incorporating a ductile FCC γ phase into the martensite matrix is known to enhance ductility in Ni-Fe-Ga ferromagnetic shape memory alloys, the nanoscale structural features of these precipitates and their correlation with mechanical properties remain unclear. In this study, we investigate the atomic-scale structures of solution-treated Ni<sub>50+x</sub>Fe<sub>24-x</sub>Ga<sub>26</sub> (x = −1, 0, 2, 5) alloys. The microstructural analyses reveal that Ni-rich compositions promote a higher volume fraction of γ-phase precipitates. Atomic-scale characterization uncovers coherent γ’ nanoprecipitates within the γ phase. Nanoindentation shows increased hardness and enhanced strain recovery, illustrates significant interfacial strengthening effects at interface of two-phase region with Ni increase. These coherent nanostructures and interfacial strengthening are identified as key to the superior strength-ductility synergy, offering new mechanistic insights into precipitation strengthening in Ni-Fe-Ga alloys.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"406 ","pages":"Article 139923"},"PeriodicalIF":2.7,"publicationDate":"2025-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145733589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-06DOI: 10.1016/j.matlet.2025.139925
Jie Zheng , Chensong Liang , Ying Li , Yongtao Huang , Tianlong Wang , Wei Zhang , Chunsheng Zhuang
The study presents a novel heterostructure electrolyte composed of fluorite-structured Sm0.2Ce0.8O1.9 (SDC), hexagonal YBaCo4O7+δ (YBC), and ultra-wide bandgap MgO (∼6.7 eV) as composite materials in this study. Compared to SDC and SDC/YBC electrolyte, the addition of MgO significantly broadens the depletion region and improves charge separation efficiency. Additionally, the ultra-wide bandgap of MgO minimizes electronic conductivity and prevents internal leakage. A fuel cell incorporating this composite electrolyte attained a peak power density of 826 mW cm−2 and an open-circuit voltage of 1.1 V at 550 °C. This represents a 12 % improvement over SDC/YBC electrolytes and a 47 % increase compared to SDC electrolytes. This study demonstrates that the SDC/YBC/MgO composite electrolyte effectively optimizes both ionic transport and interfacial stability.
{"title":"MgO-engineered depletion regions in Sm0.2Ce0.8O1.9/ YBaCo4O7+δ electrolytes boosting low-temperature SOFCs performance","authors":"Jie Zheng , Chensong Liang , Ying Li , Yongtao Huang , Tianlong Wang , Wei Zhang , Chunsheng Zhuang","doi":"10.1016/j.matlet.2025.139925","DOIUrl":"10.1016/j.matlet.2025.139925","url":null,"abstract":"<div><div>The study presents a novel heterostructure electrolyte composed of fluorite-structured Sm<sub>0.2</sub>Ce<sub>0.8</sub>O<sub>1.9</sub> (SDC), hexagonal YBaCo<sub>4</sub>O<sub>7+δ</sub> (YBC), and ultra-wide bandgap MgO (∼6.7 eV) as composite materials in this study. Compared to SDC and SDC/YBC electrolyte, the addition of MgO significantly broadens the depletion region and improves charge separation efficiency. Additionally, the ultra-wide bandgap of MgO minimizes electronic conductivity and prevents internal leakage. A fuel cell incorporating this composite electrolyte attained a peak power density of 826 mW cm<sup>−2</sup> and an open-circuit voltage of 1.1 V at 550 °C. This represents a 12 % improvement over SDC/YBC electrolytes and a 47 % increase compared to SDC electrolytes. This study demonstrates that the SDC/YBC/MgO composite electrolyte effectively optimizes both ionic transport and interfacial stability.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"406 ","pages":"Article 139925"},"PeriodicalIF":2.7,"publicationDate":"2025-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145733588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-05DOI: 10.1016/j.matlet.2025.139916
Jiacheng Li , Xiuqing Zhang , Siyu Li , Zhenhua Hao , Rulong Ma , Yongchun Shu , Jilin He
Violet tungsten oxide (W18O49) is an ideal precursor for producing ultrafine tungsten powder with uniform particle size. This study presents a mild hydrogen reduction method to prepare W18O49 from WO3 using controlled H₂/Ar ratios. The effects of reduction temperature and hydrogen/argon ratio on the morphology, phase composition, specific surface area and oxygen content of the reduced products were investigated. The results show that single-phase W18O49 with the highest specific surface area of 1.97 m2/g can be obtained under a hydrogen/argon ratio of 1:39 at 800 °C for 5 min. Furthermore, ultrafine tungsten powder can be subsequently produced from this precursor, which exhibits an average particle size of 84.7 nm and a specific surface area of 3.86 m2/g.
{"title":"Hydrogen reduction of WO3 to prepare single-phase W18O49","authors":"Jiacheng Li , Xiuqing Zhang , Siyu Li , Zhenhua Hao , Rulong Ma , Yongchun Shu , Jilin He","doi":"10.1016/j.matlet.2025.139916","DOIUrl":"10.1016/j.matlet.2025.139916","url":null,"abstract":"<div><div>Violet tungsten oxide (W<sub>18</sub>O<sub>49</sub>) is an ideal precursor for producing ultrafine tungsten powder with uniform particle size. This study presents a mild hydrogen reduction method to prepare W<sub>18</sub>O<sub>49</sub> from WO<sub>3</sub> using controlled H₂/Ar ratios. The effects of reduction temperature and hydrogen/argon ratio on the morphology, phase composition, specific surface area and oxygen content of the reduced products were investigated. The results show that single-phase W<sub>18</sub>O<sub>49</sub> with the highest specific surface area of 1.97 m<sup>2</sup>/g can be obtained under a hydrogen/argon ratio of 1:39 at 800 °C for 5 min. Furthermore, ultrafine tungsten powder can be subsequently produced from this precursor, which exhibits an average particle size of 84.7 nm and a specific surface area of 3.86 m<sup>2</sup>/g.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"406 ","pages":"Article 139916"},"PeriodicalIF":2.7,"publicationDate":"2025-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145733590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-05DOI: 10.1016/j.matlet.2025.139915
K.S. Siva Baskar, Anurag Kumar Singh, Atheena Pramod, R. Nagalakshmi
Electrospinning is one of the fiber preparation methods, which enhances crystallinity and dipole alignment in piezoelectric materials, leading to increased piezoelectric activity. Using this technique, nanofibers composed of L-Phenylalanine (LPA) inside the polymer matrix of polyethylene oxide (PEO) have been synthesized. The LPA incorporated PEO nanofiber matrix enhances the mechanical strength of the sample when compared with bare polymeric PEO fibrous film of comparable thickness. Using the polymeric LPA-PEO fiber mat, a piezoelectric nanogenerator (PENG) has been fabricated to study its energy harvesting behaviour. The sample generates a peak voltage as high as ∼8 V during palm tapping and releasing process. This study shows that the nanocomposite-based flexible PENGs are promising mechanical energy harvesters and effective power sources for portable electronic and wearable devices.
{"title":"L-phenylalanine (LPA)-poly-ethylene-oxide (PEO) based piezoelectric electrospun nanofibers for energy harvesting applications","authors":"K.S. Siva Baskar, Anurag Kumar Singh, Atheena Pramod, R. Nagalakshmi","doi":"10.1016/j.matlet.2025.139915","DOIUrl":"10.1016/j.matlet.2025.139915","url":null,"abstract":"<div><div>Electrospinning is one of the fiber preparation methods, which enhances crystallinity and dipole alignment in piezoelectric materials, leading to increased piezoelectric activity. Using this technique, nanofibers composed of L-Phenylalanine (LPA) inside the polymer matrix of polyethylene oxide (PEO) have been synthesized. The LPA incorporated PEO nanofiber matrix enhances the mechanical strength of the sample when compared with bare polymeric PEO fibrous film of comparable thickness. Using the polymeric LPA-PEO fiber mat, a piezoelectric nanogenerator (PENG) has been fabricated to study its energy harvesting behaviour. The sample generates a peak voltage as high as ∼8 V during palm tapping and releasing process. This study shows that the nanocomposite-based flexible PENGs are promising mechanical energy harvesters and effective power sources for portable electronic and wearable devices.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"406 ","pages":"Article 139915"},"PeriodicalIF":2.7,"publicationDate":"2025-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145733991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-05DOI: 10.1016/j.matlet.2025.139918
Son Van Nguyen
Rising UV radiation levels caused by ozone depletion and atmospheric changes, together with increasing environmental concerns, are driving the demand for eco-friendly, high-efficiency UV absorbers. In this study, the UV-blocking performance of apple pomace-derived carbon dots (CDs) prepared by three methods—pyrolysis, hydrothermal treatment, and combined extraction-hydrothermal process—was investigated as potential UV absorbers. The results showed that the hydrothermal CDs (H-CDs) exhibited the highest UV-absorption ability. The H-CDs present nearly quasi-spherical shapes with a mean diameter of 5.2 nm and multifunctional surface groups. To demonstrate their practical potential as a green and highly efficient UV absorber, the H-CDs were used to develop UV-protective cotton fabrics. H-CD-coated cotton fabrics showed excellent UV-protective performance, blocking 96.10 % of UVA and 96.27 % of UVB. Moreover, the H-CD-coated cotton exhibited 8.1 times the UV protection factor (UPF) offered by pure cotton.
{"title":"Apple pomace-derived carbon dots: A sustainable and excellent material for UV protection","authors":"Son Van Nguyen","doi":"10.1016/j.matlet.2025.139918","DOIUrl":"10.1016/j.matlet.2025.139918","url":null,"abstract":"<div><div>Rising UV radiation levels caused by ozone depletion and atmospheric changes, together with increasing environmental concerns, are driving the demand for eco-friendly, high-efficiency UV absorbers. In this study, the UV-blocking performance of apple pomace-derived carbon dots (CDs) prepared by three methods—pyrolysis, hydrothermal treatment, and combined extraction-hydrothermal process—was investigated as potential UV absorbers. The results showed that the hydrothermal CDs (H-CDs) exhibited the highest UV-absorption ability. The H-CDs present nearly quasi-spherical shapes with a mean diameter of 5.2 nm and multifunctional surface groups. To demonstrate their practical potential as a green and highly efficient UV absorber, the H-CDs were used to develop UV-protective cotton fabrics. H-CD-coated cotton fabrics showed excellent UV-protective performance, blocking 96.10 % of UVA and 96.27 % of UVB. Moreover, the H-CD-coated cotton exhibited 8.1 times the UV protection factor (UPF) offered by pure cotton.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"406 ","pages":"Article 139918"},"PeriodicalIF":2.7,"publicationDate":"2025-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145733599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-05DOI: 10.1016/j.matlet.2025.139914
N.A. Ali , F.A. Halim Yap , N.A. Sazelee , M.S. Yahya , M. Ismail
The MgH2–NaAlH4–Ca(BH4)2 ternary system resulted in reduced decomposition temperature with faster absorption/desorption kinetics. Compared to unary NaBH4 and MgH2, the decomposition temperature in the ternary composite decreased by 100 °C and 65 °C, respectively. The MgH2–NaAlH4–Ca(BH4)2 system exhibits faster kinetics, nearly double the rate of the destabilized system, with lower activation energies for MgH2-related and NaBH4-related (110.5 and 141.7 kJ/mol). Overall, the MgH2–NaAlH4–Ca(BH4)2 system delivers promising performance largely due to Mg–Al–B alloy formation, highlighting its potential as an efficient solid-state hydrogen storage material.
{"title":"The thermal hydrogen storage properties of a ternary hydride system: MgH2–NaAlH4–Ca(BH4)2","authors":"N.A. Ali , F.A. Halim Yap , N.A. Sazelee , M.S. Yahya , M. Ismail","doi":"10.1016/j.matlet.2025.139914","DOIUrl":"10.1016/j.matlet.2025.139914","url":null,"abstract":"<div><div>The MgH<sub>2</sub>–NaAlH<sub>4</sub>–Ca(BH<sub>4</sub>)<sub>2</sub> ternary system resulted in reduced decomposition temperature with faster absorption/desorption kinetics. Compared to unary NaBH<sub>4</sub> and MgH<sub>2</sub>, the decomposition temperature in the ternary composite decreased by 100 °C and 65 °C, respectively. The MgH<sub>2</sub>–NaAlH<sub>4</sub>–Ca(BH<sub>4</sub>)<sub>2</sub> system exhibits faster kinetics, nearly double the rate of the destabilized system, with lower activation energies for MgH<sub>2</sub>-related and NaBH<sub>4</sub>-related (110.5 and 141.7 kJ/mol). Overall, the MgH<sub>2</sub>–NaAlH<sub>4</sub>–Ca(BH<sub>4</sub>)<sub>2</sub> system delivers promising performance largely due to Mg–Al–B alloy formation, highlighting its potential as an efficient solid-state hydrogen storage material.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"406 ","pages":"Article 139914"},"PeriodicalIF":2.7,"publicationDate":"2025-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145733650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-05DOI: 10.1016/j.matlet.2025.139910
Ying Chen , Chang Liu , Mengxue Hu , Qingfang Li , Jing Su
In this work, KCuCl₃ and K₂CuCl₄·2H₂O crystals were synthesized via a solution evaporation method. Their crystal structures were verified by XRD, while the (110) interplanar spacing of K₂CuCl₄·2H₂O was further identified by HRTEM and the corresponding SAED. Thermal behavior was examined using TG/DSC. Both compounds exhibit reversible discoloration in response to temperature (20–100 °C) and humidity (0–80 % RH). UV–Vis absorption reveals band gaps of 3.05 eV for KCuCl₃ and 3.09 eV for K₂CuCl₄·2H₂O. PL spectra show blue-green emission, with CIE coordinates indicating a warmer hue for K₂CuCl₄·2H₂O, primarily attributed to the Cu2+ centers. The strong light absorption and efficient PL response of these halides highlight their potential for humidity sensing and luminescent device applications.
{"title":"Growth and reversible discoloration of KCuCl₃ and K₂CuCl₄·2H₂O crystals","authors":"Ying Chen , Chang Liu , Mengxue Hu , Qingfang Li , Jing Su","doi":"10.1016/j.matlet.2025.139910","DOIUrl":"10.1016/j.matlet.2025.139910","url":null,"abstract":"<div><div>In this work, KCuCl₃ and K₂CuCl₄·2H₂O crystals were synthesized via a solution evaporation method. Their crystal structures were verified by XRD, while the (110) interplanar spacing of K₂CuCl₄·2H₂O was further identified by HRTEM and the corresponding SAED. Thermal behavior was examined using TG/DSC. Both compounds exhibit reversible discoloration in response to temperature (20–100 °C) and humidity (0–80 % RH). UV–Vis absorption reveals band gaps of 3.05 eV for KCuCl₃ and 3.09 eV for K₂CuCl₄·2H₂O. PL spectra show blue-green emission, with CIE coordinates indicating a warmer hue for K₂CuCl₄·2H₂O, primarily attributed to the Cu<sup>2+</sup> centers. The strong light absorption and efficient PL response of these halides highlight their potential for humidity sensing and luminescent device applications.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"406 ","pages":"Article 139910"},"PeriodicalIF":2.7,"publicationDate":"2025-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145733649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-04DOI: 10.1016/j.matlet.2025.139911
Mengling Hong , Fan Li , Hongfei Yin
Research on high-entropy sulfides (HES) in photocatalytic hydrogen evolution remains limited. In this work, a precoordination-solvothermal route was developed to synthesize a high-entropy sulfide, (CdZnMnCuNiAg)Sx, for enhanced photocatalytic hydrogen production. The results demonstrate that the high-entropy (CdZnMnCuNiAg)Sx significantly outperforms pure CdS, achieving a hydrogen evolution rate of 5223.4 μmol g−1 h−1, which is 8.1 times higher than that of pristine CdS. Comprehensive analyses were conducted to examine the phase composition, morphological features, and surface chemical states of the synthesized material. Photoelectrochemical characterization reveals that the improved photocatalytic performance stems from enhanced charge separation and transfer efficiency. This study offers valuable insights into the design of high-entropy materials for advanced photocatalytic applications.
{"title":"One-dimensional high-entropy sulfides for efficient photocatalytic H2 evolution","authors":"Mengling Hong , Fan Li , Hongfei Yin","doi":"10.1016/j.matlet.2025.139911","DOIUrl":"10.1016/j.matlet.2025.139911","url":null,"abstract":"<div><div>Research on high-entropy sulfides (HES) in photocatalytic hydrogen evolution remains limited. In this work, a precoordination-solvothermal route was developed to synthesize a high-entropy sulfide, (CdZnMnCuNiAg)S<sub>x</sub>, for enhanced photocatalytic hydrogen production. The results demonstrate that the high-entropy (CdZnMnCuNiAg)S<sub>x</sub> significantly outperforms pure CdS, achieving a hydrogen evolution rate of 5223.4 μmol g<sup>−1</sup> h<sup>−1</sup>, which is 8.1 times higher than that of pristine CdS. Comprehensive analyses were conducted to examine the phase composition, morphological features, and surface chemical states of the synthesized material. Photoelectrochemical characterization reveals that the improved photocatalytic performance stems from enhanced charge separation and transfer efficiency. This study offers valuable insights into the design of high-entropy materials for advanced photocatalytic applications.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"406 ","pages":"Article 139911"},"PeriodicalIF":2.7,"publicationDate":"2025-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145682194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-04DOI: 10.1016/j.matlet.2025.139913
Vikas Kumar , Poornesh Kumar Koorata
Gaskets/sealants play a crucial role in Polymer electrolyte fuel membrane cells (PEFCs), as they separate the reactant gases from mixing and prevent leakage from the cell's edges. The sealants are subjected to PEFC working conditions with temperatures varying from room temperature to 80 °C and relative humidity (RH) in the range of 10–100 %. The sealant material's response to these environmental conditions is crucial in quantifying its impact on the PEFC performance. An experimental investigation is performed to examine the cumulative impact of RH and temperature on the dynamic characteristics of ethylene propylene diene monomer (EPDM) rubber, Fluoroelastomer (VITON) rubber, and polytetrafluoroethylene (PTFE) sealants in PEFCs. The findings imply that VITON sealant is the least, and EPDM sealant is the most influenced in the RH sweep test, whereas, PTFE sealant is the least and VITON sealant is the most influenced in the temperature sweep test. The current study highlights the impact of sealant material selection and its viscoelastic characteristics on the longevity and performance of PEFC.
{"title":"Impact of hygrothermal factor on the dynamic mechanical responses of sealants applicable to polymer electrolyte fuel cells","authors":"Vikas Kumar , Poornesh Kumar Koorata","doi":"10.1016/j.matlet.2025.139913","DOIUrl":"10.1016/j.matlet.2025.139913","url":null,"abstract":"<div><div>Gaskets/sealants play a crucial role in Polymer electrolyte fuel membrane cells (PEFCs), as they separate the reactant gases from mixing and prevent leakage from the cell's edges. The sealants are subjected to PEFC working conditions with temperatures varying from room temperature to 80 °C and relative humidity (RH) in the range of 10–100 %. The sealant material's response to these environmental conditions is crucial in quantifying its impact on the PEFC performance. An experimental investigation is performed to examine the cumulative impact of RH and temperature on the dynamic characteristics of ethylene propylene diene monomer (EPDM) rubber, Fluoroelastomer (VITON) rubber, and polytetrafluoroethylene (PTFE) sealants in PEFCs. The findings imply that VITON sealant is the least, and EPDM sealant is the most influenced in the RH sweep test, whereas, PTFE sealant is the least and VITON sealant is the most influenced in the temperature sweep test. The current study highlights the impact of sealant material selection and its viscoelastic characteristics on the longevity and performance of PEFC.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"406 ","pages":"Article 139913"},"PeriodicalIF":2.7,"publicationDate":"2025-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145733591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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