Pub Date : 2024-11-27DOI: 10.1016/j.materresbull.2024.113231
Pan Chen , Bin Yuan , Jiachen Wang , Xin Zhang , Yaoguang Chen , Fengjiao Cao , Haojie Zhao , Yanquan Wang , Xiaohui Yuan , Zhongming Hu , Haojie Lian , Feng Zhu , Pei Li , Leilei Chen
For (1-x)Na0.5Bi0.5TiO3-xBaTiO3 (NBT-BT) ceramics, the highest piezoelectric performances appears at morphotropic phase boundary (x=0.06∼0.10). Recently, quenching has been as an effective way to improve their piezoelectric performances. In this work, comparative study on normally cooled and quenched NBT-BT ceramics was conducted. We found, there is a close positive correlation between electrical properties and local polar heterogeneity. It was verified in a case study on NBBT6 ceramics by tuning the local polar heterogeneity using Bi or Sr nonstoichiometric modification. And the highest d33 ∼ 207 pC/N is obtained in Bi-modified NBT-BT ceramics. It demonstrates that, to obtain a higher d33, the factors affecting local polar heterogeneity of piezoelectric ceramics could be preferentially considered.
{"title":"Enhanced piezoelectric response of Na0.5Bi0.5TiO3-BaTiO3 lead free ceramics by tuning the local polar heterogeneity","authors":"Pan Chen , Bin Yuan , Jiachen Wang , Xin Zhang , Yaoguang Chen , Fengjiao Cao , Haojie Zhao , Yanquan Wang , Xiaohui Yuan , Zhongming Hu , Haojie Lian , Feng Zhu , Pei Li , Leilei Chen","doi":"10.1016/j.materresbull.2024.113231","DOIUrl":"10.1016/j.materresbull.2024.113231","url":null,"abstract":"<div><div>For (1-<em>x</em>)Na<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub>-<em>x</em>BaTiO<sub>3</sub> (NBT-BT) ceramics, the highest piezoelectric performances appears at morphotropic phase boundary (<em>x</em>=0.06∼0.10). Recently, quenching has been as an effective way to improve their piezoelectric performances. In this work, comparative study on normally cooled and quenched NBT-BT ceramics was conducted. We found, there is a close positive correlation between electrical properties and local polar heterogeneity. It was verified in a case study on NBBT6 ceramics by tuning the local polar heterogeneity using Bi or Sr nonstoichiometric modification. And the highest d<sub>33</sub> ∼ 207 pC/N is obtained in Bi-modified NBT-BT ceramics. It demonstrates that, to obtain a higher d<sub>33</sub>, the factors affecting local polar heterogeneity of piezoelectric ceramics could be preferentially considered.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"184 ","pages":"Article 113231"},"PeriodicalIF":5.3,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142759365","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}
Scintillators, which can rapidly transform high-energy photons of ionizing radiation into low-energy photons, are widely utilized for radiation detectors. In particular, scintillators with a slow decay time constant (several µs-order) commonly mounted on radiation detectors classified with current-type detectors. The commercial scintillators currently employed in current-type detectors, such as Tl:CsI and CdWO4 (CWO), are containing substance restricted by the RoHS2 directives or exhibiting hygroscopic property, respectively. Therefore, there is a need for new scintillators that can overcome these limitations. In light of this, Dy:GdVO4 single crystals were fabricated and evaluated their potential as scintillators in current-type detectors. Our results demonstrate that the light yield of the Dy:GdVO4 shows 50,000 photons/MeV, with the afterglow level of 4.3 ppm. Such performances are equal or better than those of CWO and Tl:CsI, suggesting that Dy: GdVO4 is a promising candidate for new scintillator in current-type detectors.
{"title":"Fabrication of Dy:GdVO4 single crystals and evaluation of scintillation performance","authors":"Kensei Ichiba , Akihiro Nishikawa , Takumi Kato , Daisuke Nakauchi , Kenichi Watanabe , Noriaki Kawaguchi , Takayuki Yanagida","doi":"10.1016/j.materresbull.2024.113228","DOIUrl":"10.1016/j.materresbull.2024.113228","url":null,"abstract":"<div><div>Scintillators, which can rapidly transform high-energy photons of ionizing radiation into low-energy photons, are widely utilized for radiation detectors. In particular, scintillators with a slow decay time constant (several µs-order) commonly mounted on radiation detectors classified with current-type detectors. The commercial scintillators currently employed in current-type detectors, such as Tl:CsI and CdWO<sub>4</sub> (CWO), are containing substance restricted by the RoHS2 directives or exhibiting hygroscopic property, respectively. Therefore, there is a need for new scintillators that can overcome these limitations. In light of this, Dy:GdVO<sub>4</sub> single crystals were fabricated and evaluated their potential as scintillators in current-type detectors. Our results demonstrate that the light yield of the Dy:GdVO<sub>4</sub> shows 50,000 photons/MeV, with the afterglow level of 4.3 ppm. Such performances are equal or better than those of CWO and Tl:CsI, suggesting that Dy: GdVO<sub>4</sub> is a promising candidate for new scintillator in current-type detectors.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"184 ","pages":"Article 113228"},"PeriodicalIF":5.3,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-26DOI: 10.1016/j.materresbull.2024.113230
Xueying Wang , Hanmei Hu , Tianle Zhang , Han Xuan , Chonghai Deng
A new type of MnxCd1-xS p-n junction self-assembled by n-type twin-phase MnxCd1-xS (T-CdS-hosted MCS) and p-type MnxCd1-xS (α-MnS-hosted MCS) was fabricated through a convenient one-pot hydrothermal route. The photocatalytic HER performance of 0.5MCS (x = 0.5) was greatly improved on coupling with noble metal-free NiS cocatalyst. The H2-evolution rate of optimal 1.0 wt% NiS/0.5MCS reached 53.4 mmol·g-1·h-1 under visible-light irradiation, almost 17.6 times higher than that of pristine T-CdS, which significantly exceeded that of 1.0 wt% Pt/0.5MCS (16.7 mmol·g-1·h-1). The AQE of 1.0 wt% NiS/0.5MCS of was 22.49% at 420 nm. The possible photocatalytic mechanism was rationally put forward based on the current experimental results and band structure, revealing that the built-in electric field at the interface of MnxCd1-xS p-n junction as well as auxiliary catalytic effect of NiS effectively promoted the transfer and separation of the photogenerated electron-hole pairs, thus leading to the improvement of photocatalytic HER ability.
{"title":"Engineering novel MnxCd1-xS self-assembled p-n junction modified with NiS for enhanced photocatalytic hydrogen evolution","authors":"Xueying Wang , Hanmei Hu , Tianle Zhang , Han Xuan , Chonghai Deng","doi":"10.1016/j.materresbull.2024.113230","DOIUrl":"10.1016/j.materresbull.2024.113230","url":null,"abstract":"<div><div>A new type of Mn<sub>x</sub>Cd<sub>1-x</sub>S p-n junction self-assembled by n-type twin-phase Mn<sub>x</sub>Cd<sub>1-x</sub>S (T-CdS-hosted MCS) and p-type Mn<sub>x</sub>Cd<sub>1-x</sub>S (α-MnS-hosted MCS) was fabricated through a convenient one-pot hydrothermal route. The photocatalytic HER performance of 0.5MCS (<em>x</em> = 0.5) was greatly improved on coupling with noble metal-free NiS cocatalyst. The H<sub>2</sub>-evolution rate of optimal 1.0 wt% NiS/0.5MCS reached 53.4 mmol·g<sup>-1</sup>·h<sup>-1</sup> under visible-light irradiation, almost 17.6 times higher than that of pristine T-CdS, which significantly exceeded that of 1.0 wt% Pt/0.5MCS (16.7 mmol·g<sup>-1</sup>·h<sup>-1</sup>). The AQE of 1.0 wt% NiS/0.5MCS of was 22.49% at 420 nm. The possible photocatalytic mechanism was rationally put forward based on the current experimental results and band structure, revealing that the built-in electric field at the interface of Mn<sub>x</sub>Cd<sub>1-x</sub>S p-n junction as well as auxiliary catalytic effect of NiS effectively promoted the transfer and separation of the photogenerated electron-hole pairs, thus leading to the improvement of photocatalytic HER ability.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"184 ","pages":"Article 113230"},"PeriodicalIF":5.3,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-25DOI: 10.1016/j.materresbull.2024.113229
Viviana B. Daboin , Julieta S. Riva , Paula G. Bercoff
We study the magnetic characteristics of nanofilms composed of CoFe2O4 nanoparticles synthesized by thermal decomposition (TD) and self-combustion (SC) methods, assembled on glass substrates using the Langmuir-Blodgett technique. Despite both synthesis methods render crystalline Co ferrite nanoparticles, the differences in particle size and saturation magnetization are notable; however, both nanofilms reveal a ferrimagnetic behavior and display a significant surface contribution to the net magnetization at temperatures below 50 K. This effect is attributed to the nanoparticles' surface spins misaligning with the spins of the ordered core and freezing into a disordered structure. Effective anisotropy Keff values were determined, obtaining similar values to the bulk material (Keff ∼2 × 105J/m3) for the nanofilm made of TD nanoparticles, while the nanofilm prepared with SC nanoparticles presents an enhanced value (Keff=5 × 105J/m3). The temperature-dependent saturation magnetization curves were fitted with the modified Bloch's law and an additional term that corresponds to the frozen spins.
{"title":"Magnetic behavior of nanofilms prepared by assembling different Co ferrite nanoparticles","authors":"Viviana B. Daboin , Julieta S. Riva , Paula G. Bercoff","doi":"10.1016/j.materresbull.2024.113229","DOIUrl":"10.1016/j.materresbull.2024.113229","url":null,"abstract":"<div><div>We study the magnetic characteristics of nanofilms composed of CoFe<sub>2</sub>O<sub>4</sub> nanoparticles synthesized by thermal decomposition (TD) and self-combustion (SC) methods, assembled on glass substrates using the Langmuir-Blodgett technique. Despite both synthesis methods render crystalline Co ferrite nanoparticles, the differences in particle size and saturation magnetization are notable; however, both nanofilms reveal a ferrimagnetic behavior and display a significant surface contribution to the net magnetization at temperatures below 50 K. This effect is attributed to the nanoparticles' surface spins misaligning with the spins of the ordered core and freezing into a disordered structure. Effective anisotropy <em>K<sub>eff</sub></em> values were determined, obtaining similar values to the bulk material (<em>K<sub>eff</sub></em> ∼2 × 10<sup>5</sup> <em>J</em>/m<sup>3</sup>) for the nanofilm made of TD nanoparticles, while the nanofilm prepared with SC nanoparticles presents an enhanced value (<em>K<sub>eff</sub></em>=5 × 10<sup>5</sup> <em>J</em>/m<sup>3</sup>). The temperature-dependent saturation magnetization curves were fitted with the modified Bloch's law and an additional term that corresponds to the frozen spins.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"184 ","pages":"Article 113229"},"PeriodicalIF":5.3,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-24DOI: 10.1016/j.materresbull.2024.113226
Zijie Fang , Shouxin Zhu , Zhexiao Zhu , Can Sun , Jingyi Qu , Weiwei Li , Hui Zheng
Aiming to address the increasingly serious issue of tetracycline pollution, a photocatalyst was synthesized using the hydrothermal method with glutamic acid and isonicotinic acid as organic ligands, along with copper nitrate. The effectiveness of this photocatalyst in treating antibiotic wastewater under visible light was studied. The prepared photocatalysts were characterized using SEM, XRD, BET, XPS, UV and ESR. The results revealed the introduction of isonicotinic acid led to a transformation of the catalyst from a two-dimensional structure to a three-dimensional structure, thereby increasing the active sites for degradation of tetracycline (TC) in wastewater. Through degradation experiments conducted under visible light, the catalyst demonstrated a 92.28 % degradation of TC at a concentration of 40 mg/L and a catalyst concentration of 0.5 g/L. It exhibited a high degradation rate under neutral conditions and displayed strong performance in degrading municipal sewage and river sewage.
{"title":"Catalytic degradation of tetracycline antibiotics by copper-based containing organic ligands","authors":"Zijie Fang , Shouxin Zhu , Zhexiao Zhu , Can Sun , Jingyi Qu , Weiwei Li , Hui Zheng","doi":"10.1016/j.materresbull.2024.113226","DOIUrl":"10.1016/j.materresbull.2024.113226","url":null,"abstract":"<div><div>Aiming to address the increasingly serious issue of tetracycline pollution, a photocatalyst was synthesized using the hydrothermal method with glutamic acid and isonicotinic acid as organic ligands, along with copper nitrate. The effectiveness of this photocatalyst in treating antibiotic wastewater under visible light was studied. The prepared photocatalysts were characterized using SEM, XRD, BET, XPS, UV and ESR. The results revealed the introduction of isonicotinic acid led to a transformation of the catalyst from a two-dimensional structure to a three-dimensional structure, thereby increasing the active sites for degradation of tetracycline (TC) in wastewater. Through degradation experiments conducted under visible light, the catalyst demonstrated a 92.28 % degradation of TC at a concentration of 40 mg/L and a catalyst concentration of 0.5 g/L. It exhibited a high degradation rate under neutral conditions and displayed strong performance in degrading municipal sewage and river sewage.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"184 ","pages":"Article 113226"},"PeriodicalIF":5.3,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-23DOI: 10.1016/j.materresbull.2024.113227
Gaosong Wang , Wentao Sun , Da Xu , Minghui Zhang , Long Niu , Yanzhi Wang
In this paper, Al-Zn alloys with different Ce- and La contents (<1 %) were prepared by semi-continuous casting method, and the cost of adding a large amount of RE elements to large ingots was considered. The effects of rare earth element Ce and La content on the microstructure, properties and corrosion behavior of Al-Zn alloy were systematically studied. The results showed that the addition of RE promoted the formation of the Al11Ce3 phase, but the addition of too high a high amount led to the formation of the deleterious crude primary Al11Ce3 phase. With the increase of rare earth elements, the hardness of Al-Zn alloy gradually increases ( Approximately 22 % increase ), the wear resistance is improved ( Friction rate decreased from 54.3 to 36.5 mgN−1m−1 ), and the corrosion resistance is also improved. This can be attributed to the strengthening of the matrix by Al11Ce3 and the formation of a dense protective film, resulting in improved corrosion performance. Corrosion of alloys is caused by pitting corrosion. Corrosion starts from the passivation state and reaches a pitting stability phase through the pitting induction period.
{"title":"Effects of rare earth element content on the microstructural properties and corrosion resistance of Al-Zn alloy","authors":"Gaosong Wang , Wentao Sun , Da Xu , Minghui Zhang , Long Niu , Yanzhi Wang","doi":"10.1016/j.materresbull.2024.113227","DOIUrl":"10.1016/j.materresbull.2024.113227","url":null,"abstract":"<div><div>In this paper, Al-Zn alloys with different Ce- and La contents (<1 %) were prepared by semi-continuous casting method, and the cost of adding a large amount of RE elements to large ingots was considered. The effects of rare earth element Ce and La content on the microstructure, properties and corrosion behavior of Al-Zn alloy were systematically studied. The results showed that the addition of RE promoted the formation of the Al<sub>11</sub>Ce<sub>3</sub> phase, but the addition of too high a high amount led to the formation of the deleterious crude primary Al<sub>11</sub>Ce<sub>3</sub> phase. With the increase of rare earth elements, the hardness of Al-Zn alloy gradually increases ( Approximately 22 % increase ), the wear resistance is improved ( Friction rate decreased from 54.3 to 36.5 mgN<sup>−1</sup>m<sup>−1</sup> ), and the corrosion resistance is also improved. This can be attributed to the strengthening of the matrix by Al<sub>11</sub>Ce<sub>3</sub> and the formation of a dense protective film, resulting in improved corrosion performance. Corrosion of alloys is caused by pitting corrosion. Corrosion starts from the passivation state and reaches a pitting stability phase through the pitting induction period.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"184 ","pages":"Article 113227"},"PeriodicalIF":5.3,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-23DOI: 10.1016/j.materresbull.2024.113222
Chaoli Wang , Bin Liu , Jing Ren , Muhammad Sufyan Javed , Weihua Han
Photocatalysts based on zinc oxide (ZnO) are promising for environmental applications, but their weak photoresponse and low photocarrier separation efficiency limit their practical use. To tackle this issue, we constructed Z-scheme composite photocatalysts of ZnO to boost its photocatalytic performance. We achieved the Z-scheme structure by hydrothermal modification of SnS2 nanoparticles onto ZnO microspheres. Its photocatalytic performance was evaluated through the degradation of Rhodamine B (RhB) under visible light with the assistance of magnetic stirring. The composite photocatalyst exhibited superior performance compared to individual ZnO and SnS2, achieving an optimal degradation rate of 0.0706 min⁻¹. This rate was 15.08 times higher than that of individual ZnO and 10.51 times higher than individual SnS2. Free radical trapping experiments showed that ·O2⁻ and ·OH radicals played a key role in RhB degradation. The Z-scheme composite structure established novel charge transport pathways, guided the migration of photogenerated carriers, and improved spatial separation, thereby enhancing photocatalytic performance. This study provides valuable insights into the design of highly efficient photocatalysts for environmental remediation, offering a promising solution for addressing challenges in pollution control and wastewater treatment.
{"title":"Enhanced photocatalytic performance of SnS2/ZnO Z-scheme composite photocatalysts for efficient environmental remediation","authors":"Chaoli Wang , Bin Liu , Jing Ren , Muhammad Sufyan Javed , Weihua Han","doi":"10.1016/j.materresbull.2024.113222","DOIUrl":"10.1016/j.materresbull.2024.113222","url":null,"abstract":"<div><div>Photocatalysts based on zinc oxide (ZnO) are promising for environmental applications, but their weak photoresponse and low photocarrier separation efficiency limit their practical use. To tackle this issue, we constructed Z-scheme composite photocatalysts of ZnO to boost its photocatalytic performance. We achieved the Z-scheme structure by hydrothermal modification of SnS<sub>2</sub> nanoparticles onto ZnO microspheres. Its photocatalytic performance was evaluated through the degradation of Rhodamine B (RhB) under visible light with the assistance of magnetic stirring. The composite photocatalyst exhibited superior performance compared to individual ZnO and SnS<sub>2</sub>, achieving an optimal degradation rate of 0.0706 min⁻¹. This rate was 15.08 times higher than that of individual ZnO and 10.51 times higher than individual SnS<sub>2</sub>. Free radical trapping experiments showed that ·O<sub>2</sub>⁻ and ·OH radicals played a key role in RhB degradation. The Z-scheme composite structure established novel charge transport pathways, guided the migration of photogenerated carriers, and improved spatial separation, thereby enhancing photocatalytic performance. This study provides valuable insights into the design of highly efficient photocatalysts for environmental remediation, offering a promising solution for addressing challenges in pollution control and wastewater treatment.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"183 ","pages":"Article 113222"},"PeriodicalIF":5.3,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721237","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}
Quantum dot-sensitized solar cells (QDSSCs) present a promising approach for advancing solar energy conversion due to their tunable optical properties, quantum confinements and superior charge carrier dynamics. This review explores recent innovations in photoanode materials, focusing on the integration of functional quantum dots such as CdS, CdSe, PbS, and other novel QD materials like nickel phosphide, plasmonic, carbon/graphene, hexagonal-boron nitride, and black phosphorus, etc. Several studies show that optimally configured QDSSCs can reach power conversion efficiencies (PCE) of up to 8.6% in systems sensitized with PbS/CdS QDs on ZnO nanorods, marking significant advancements in light harvesting and energy conversion capabilities. Notably, core-shell architectures such as TiO₂-SiO₂ have been shown to enhance light scattering and optimize electron transfer pathways, resulting in PCEs of approximately 3.6%, a substantial increase over conventional designs. The review highlights the design of photoanodes with enhanced surface area, structural diversity, and light absorption, emphasizing the role of multi-band energetics, inter-band transitions and composite interactions. Additionally, this review offers insights into how optimized photoanode morphologies and QD coupling can mitigate surface charge recombination, enhance catalytic activity, and elevate green hydrogen production. By addressing key developments in material engineering, this work aims to guide future research towards more efficient and sustainable energy technologies.
{"title":"Exponential developments of quantum dots ecosystem for solar energy conversion and photocatalytic reactions: From photoanode design to renewable energy applications","authors":"Sunil Kumar , Niranjan Patra , Ismail Hossain , Abhinay Thakur , T. Jaseetharan , Navinchandra Gopal Shimpi","doi":"10.1016/j.materresbull.2024.113223","DOIUrl":"10.1016/j.materresbull.2024.113223","url":null,"abstract":"<div><div>Quantum dot-sensitized solar cells (QDSSCs) present a promising approach for advancing solar energy conversion due to their tunable optical properties, quantum confinements and superior charge carrier dynamics. This review explores recent innovations in photoanode materials, focusing on the integration of functional quantum dots such as CdS, CdSe, PbS, and other novel QD materials like nickel phosphide, plasmonic, carbon/graphene, hexagonal-boron nitride, and black phosphorus, etc. Several studies show that optimally configured QDSSCs can reach power conversion efficiencies (PCE) of up to 8.6% in systems sensitized with PbS/CdS QDs on ZnO nanorods, marking significant advancements in light harvesting and energy conversion capabilities. Notably, core-shell architectures such as TiO₂-SiO₂ have been shown to enhance light scattering and optimize electron transfer pathways, resulting in PCEs of approximately 3.6%, a substantial increase over conventional designs. The review highlights the design of photoanodes with enhanced surface area, structural diversity, and light absorption, emphasizing the role of multi-band energetics, inter-band transitions and composite interactions. Additionally, this review offers insights into how optimized photoanode morphologies and QD coupling can mitigate surface charge recombination, enhance catalytic activity, and elevate green hydrogen production. By addressing key developments in material engineering, this work aims to guide future research towards more efficient and sustainable energy technologies.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"184 ","pages":"Article 113223"},"PeriodicalIF":5.3,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-22DOI: 10.1016/j.materresbull.2024.113220
Pranita Sharma , Seunghyun Lee , Jonghyeon Choi , Jung-Woo Yoo , Krishna Begari , CheolGi Kim
Spin pumping in bilayer systems composed of ferromagnetic materials (FM) and heavy metals (HM) generates spin currents that can be detected by the inverse spin Hall effect (ISHE). Here, the reduction in Gilbert's damping (α) during spin pumping and the ISHE in the SiO2/Ta (tnm)/NiFe (10nm) bilayer system was observed. The value of α for SiO2/NiFe (10 nm) was determined to be 0.0121 ± 0.0003. However, for SiO2/Ta (t nm)/NiFe (10 nm), a consistently lower damping across all Ta thicknesses was observed, which could be due to non-equilibrium spin accumulation at the interface. Additionally, high interfacial spin mixing conductance values of -1.83(±0.05) × 1019 m-2 and a spin diffusion length (λSD) of 2.77±0.53 nm was obtained. Further high inverse spin Hall voltage was recorded and the spin Hall angle of -0.024 was calculated for the Ta 7 nm system.
{"title":"Impact of surface oxidation on gilbert damping and inverse spin hall effect in SiO2/Ta/NiFe multilayers","authors":"Pranita Sharma , Seunghyun Lee , Jonghyeon Choi , Jung-Woo Yoo , Krishna Begari , CheolGi Kim","doi":"10.1016/j.materresbull.2024.113220","DOIUrl":"10.1016/j.materresbull.2024.113220","url":null,"abstract":"<div><div>Spin pumping in bilayer systems composed of ferromagnetic materials (FM) and heavy metals (HM) generates spin currents that can be detected by the inverse spin Hall effect (ISHE). Here, the reduction in Gilbert's damping (<em>α</em>) during spin pumping and the ISHE in the SiO<sub>2</sub>/Ta (tnm)/NiFe (10nm) bilayer system was observed. The value of <em>α</em> for SiO<sub>2</sub>/NiFe (10 nm) was determined to be 0.0121 ± 0.0003. However, for SiO<sub>2</sub>/Ta (t nm)/NiFe (10 nm), a consistently lower damping across all Ta thicknesses was observed, which could be due to non-equilibrium spin accumulation at the interface. Additionally, high interfacial spin mixing conductance values of -1.83(±0.05) × 10<sup>19</sup> m<sup>-2</sup> and a spin diffusion length (<em>λ<sub>SD</sub></em>) of 2.77±0.53 nm was obtained. Further high inverse spin Hall voltage was recorded and the spin Hall angle of -0.024 was calculated for the Ta 7 nm system.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"183 ","pages":"Article 113220"},"PeriodicalIF":5.3,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-22DOI: 10.1016/j.materresbull.2024.113225
Sethumathavan Vadivel , Venkata Sai Harish Dharmavarapu , P. Sujita , S Sarmila , V. Gopal , Nagaraj Murugan , Yoong Ahm Kim , B. Saravanakumar , P.A. Periasamy
Modern scientific research development relies on high-entropy materials, which stand out for their intricate nature, positioning them as the nanomaterials of the future electrochemical energy storage device. In this work, we prepared a BiOX (X=Br, Cl, I) CO3 known as BiOXCO3 materials using a simple solvothermal approach. Further investigation was carried out on the electrochemical responses of electrodes based on BiOXCO3. BiOXCO3 (1) is the name given to the equal molar concentration of Br, Cl, I, and CO3. BiOXCO3 (2) was created when the concentration of Br was doubled, followed by BiOXCO3 (3) with Cl, BiOXCO3 (4) with I, and BiOXCO3 (5) with CO3. Among them, BiOXCO3 (5) has demonstrated a supreme specific capacitance value of 645 F g−1 at 1 A g−1. This preliminary work describes the tuning of the anion concentration in BiOXCO3 materials toward supercapacitor applications, paving the way for future investigations of bismuth-based high-entropy materials.
{"title":"A robust approach for designing a bismuth high entropy material (BiOXCO3) as a novel electrode material for supercapacitor applications","authors":"Sethumathavan Vadivel , Venkata Sai Harish Dharmavarapu , P. Sujita , S Sarmila , V. Gopal , Nagaraj Murugan , Yoong Ahm Kim , B. Saravanakumar , P.A. Periasamy","doi":"10.1016/j.materresbull.2024.113225","DOIUrl":"10.1016/j.materresbull.2024.113225","url":null,"abstract":"<div><div>Modern scientific research development relies on high-entropy materials, which stand out for their intricate nature, positioning them as the nanomaterials of the future electrochemical energy storage device. In this work, we prepared a BiOX (<sub>X=Br, Cl, I</sub>) CO<sub>3</sub> known as BiOXCO<sub>3</sub> materials using a simple solvothermal approach. Further investigation was carried out on the electrochemical responses of electrodes based on BiOXCO<sub>3</sub>. BiOXCO<sub>3</sub> (1) is the name given to the equal molar concentration of Br, Cl, I, and CO<sub>3</sub>. BiOXCO<sub>3</sub> (2) was created when the concentration of Br was doubled, followed by BiOXCO<sub>3</sub> (3) with Cl, BiOXCO<sub>3</sub> (4) with I, and BiOXCO<sub>3</sub> (5) with CO<sub>3</sub>. Among them, BiOXCO<sub>3</sub> (5) has demonstrated a supreme specific capacitance value of 645 F g<sup>−1</sup> at 1 A g<sup>−1</sup>. This preliminary work describes the tuning of the anion concentration in BiOXCO<sub>3</sub> materials toward supercapacitor applications, paving the way for future investigations of bismuth-based high-entropy materials.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"184 ","pages":"Article 113225"},"PeriodicalIF":5.3,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745318","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}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号