Pub Date : 2025-02-01Epub Date: 2022-08-17DOI: 10.1111/bph.15930
Nick J Spencer, Damien J Keating
Since the 1950s, considerable circumstantial evidence had been presented that endogenous 5-HT (serotonin) synthesized from within the wall of the gastrointestinal (GI) tract played an important role in GI motility and transit. However, identifying the precise functional role of gut-derived 5-HT has been difficult to ascertain, for a number of reasons. Over the past decade, as recording techniques have advanced significantly and access to new genetically modified animals improved, there have been major new insights and major changes in our understanding of the functional role of endogenous 5-HT in the GI tract. Data from many different laboratories have shown that major patterns of GI motility and transit still occur with minor or no, change when all endogenous 5-HT is pharmacologically or genetically ablated from the gut. Furthermore, antagonists of 5-HT3 receptors are equally, or more potent at inhibiting GI motility in segments of intestine that are completely depleted of endogenous 5-HT. Here, the most recent findings are discussed with regard to the functional role of endogenous 5-HT in enterochromaffin cells and enteric neurons in gut motility and more broadly in some major homeostatic pathways.
{"title":"Role of 5-HT in the enteric nervous system and enteroendocrine cells.","authors":"Nick J Spencer, Damien J Keating","doi":"10.1111/bph.15930","DOIUrl":"10.1111/bph.15930","url":null,"abstract":"<p><p>Since the 1950s, considerable circumstantial evidence had been presented that endogenous 5-HT (serotonin) synthesized from within the wall of the gastrointestinal (GI) tract played an important role in GI motility and transit. However, identifying the precise functional role of gut-derived 5-HT has been difficult to ascertain, for a number of reasons. Over the past decade, as recording techniques have advanced significantly and access to new genetically modified animals improved, there have been major new insights and major changes in our understanding of the functional role of endogenous 5-HT in the GI tract. Data from many different laboratories have shown that major patterns of GI motility and transit still occur with minor or no, change when all endogenous 5-HT is pharmacologically or genetically ablated from the gut. Furthermore, antagonists of 5-HT<sub>3</sub> receptors are equally, or more potent at inhibiting GI motility in segments of intestine that are completely depleted of endogenous 5-HT. Here, the most recent findings are discussed with regard to the functional role of endogenous 5-HT in enterochromaffin cells and enteric neurons in gut motility and more broadly in some major homeostatic pathways.</p>","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":" ","pages":"471-483"},"PeriodicalIF":5.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40525099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2025-01-17DOI: 10.1038/s41563-024-02076-8
Francesco Furlan, Nicola Gasparini
Crystallization dynamics manipulation leads to vertically separated donor and acceptor phases in thick films, improving charge mobility and device efficiency.
{"title":"Organic photovoltaics surpass the 20% efficiency milestone","authors":"Francesco Furlan, Nicola Gasparini","doi":"10.1038/s41563-024-02076-8","DOIUrl":"https://doi.org/10.1038/s41563-024-02076-8","url":null,"abstract":"Crystallization dynamics manipulation leads to vertically separated donor and acceptor phases in thick films, improving charge mobility and device efficiency.","PeriodicalId":19058,"journal":{"name":"Nature Materials","volume":"55 1","pages":""},"PeriodicalIF":41.2,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The interactions between solid quantum dots (QDs) are weak as the excitons in QDs are difficult to be dissolved into electrons and holes, which limits the performance of QDs based photodetector. Herein, through putting QDs inside the water, it is intriguingly found that excitons are dissolved into electrons and holes by the interaction between QDs and water molecules, which further contribute to the formation of long-range electron/hole transport channels within the water. At zero voltage bias, a transient photo-polarized current is repeatedly produced, the specific responsivity and detectivity of liquid-based photodetector with molybdenum disulfide (MoS2) QDs aqueous suspension can reach 188.1 mA W−1 and 1.164 × 1010 Jones with 820 nm illumination, respectively. The specific spectra of photodetectors can be promoted by selected QDs with different absorption peaks. Actually, the responsivity of liquid-based photodetector with cadmium selenide (CdSe) QDs exhibits the most significant enhancement effect at the peak of exciton absorption wavelength of QDs, as much more excitons in QDs can be dissolved into electrons and holes. It is anticipated that the ability to dissolve excitons in QDs and form conducting channels by dynamic construction of water molecules will bring possibilities for high-performance optoelectronic devices across a wide range of application scenarios.
{"title":"Liquid Water Molecular Connected Quantum Dots for Self-Driven Photodetector","authors":"Zhihao Qian, Minhui Yang, Shisheng Lin","doi":"10.1002/adfm.202420182","DOIUrl":"https://doi.org/10.1002/adfm.202420182","url":null,"abstract":"The interactions between solid quantum dots (QDs) are weak as the excitons in QDs are difficult to be dissolved into electrons and holes, which limits the performance of QDs based photodetector. Herein, through putting QDs inside the water, it is intriguingly found that excitons are dissolved into electrons and holes by the interaction between QDs and water molecules, which further contribute to the formation of long-range electron/hole transport channels within the water. At zero voltage bias, a transient photo-polarized current is repeatedly produced, the specific responsivity and detectivity of liquid-based photodetector with molybdenum disulfide (MoS<sub>2</sub>) QDs aqueous suspension can reach 188.1 mA W<sup>−1</sup> and 1.164 × 10<sup>10</sup> Jones with 820 nm illumination, respectively. The specific spectra of photodetectors can be promoted by selected QDs with different absorption peaks. Actually, the responsivity of liquid-based photodetector with cadmium selenide (CdSe) QDs exhibits the most significant enhancement effect at the peak of exciton absorption wavelength of QDs, as much more excitons in QDs can be dissolved into electrons and holes. It is anticipated that the ability to dissolve excitons in QDs and form conducting channels by dynamic construction of water molecules will bring possibilities for high-performance optoelectronic devices across a wide range of application scenarios.","PeriodicalId":112,"journal":{"name":"Advanced Functional Materials","volume":"205 1","pages":""},"PeriodicalIF":19.0,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Inorganic CsPbI3 perovskite has emerged as a promising emitter for deep-red light-emitting diodes (LEDs) due to its intrinsic thermal stability and suitable bandgap. However, uncontrollable CsPbI3 crystallization induced by an alkaline zinc oxide (ZnO) substrate in bulk film-based LEDs leads to insufficient external quantum efficiencies (EQEs) at high brightness, leaving obstacles in commercialization progress. Herein, we demonstrate an effective acidic engineering strategy with wide applicability to modify the surface property of ZnO and regulate CsPbI3 crystallization. Via systematically selecting 1,4-cyclohexanedicarboxylic acid with a mild acid dissociation constant to functionalize the buried interface, we mitigate the speed of the deprotonation reaction and achieve homogeneous CsPbI3 films with high phase purity and fewer defects. The resulting CsPbI3 perovskite LEDs (PeLEDs) exhibit a record EQE of 19.4% at a high luminance of 3400 cd m–2, representing the state-of-art bulk CsPbI3 PeLEDs. These findings provide valuable insights in the advancement of efficient CsPbI3 PeLEDs.
{"title":"Acidic Engineering on Buried Interface toward Efficient Inorganic CsPbI3 Perovskite Light-Emitting Diodes","authors":"Wenji Zhan, Jingjing Cao, Haifei Wang, Meng Ren, Menglei Feng, Yingping Fan, Jiahao Guo, Yao Wang, Yuetian Chen, Yanfeng Miao, Yixin Zhao","doi":"10.1021/acs.nanolett.4c05694","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c05694","url":null,"abstract":"Inorganic CsPbI<sub>3</sub> perovskite has emerged as a promising emitter for deep-red light-emitting diodes (LEDs) due to its intrinsic thermal stability and suitable bandgap. However, uncontrollable CsPbI<sub>3</sub> crystallization induced by an alkaline zinc oxide (ZnO) substrate in bulk film-based LEDs leads to insufficient external quantum efficiencies (EQEs) at high brightness, leaving obstacles in commercialization progress. Herein, we demonstrate an effective acidic engineering strategy with wide applicability to modify the surface property of ZnO and regulate CsPbI<sub>3</sub> crystallization. Via systematically selecting 1,4-cyclohexanedicarboxylic acid with a mild acid dissociation constant to functionalize the buried interface, we mitigate the speed of the deprotonation reaction and achieve homogeneous CsPbI<sub>3</sub> films with high phase purity and fewer defects. The resulting CsPbI<sub>3</sub> perovskite LEDs (PeLEDs) exhibit a record EQE of 19.4% at a high luminance of 3400 cd m<sup>–2</sup>, representing the state-of-art bulk CsPbI<sub>3</sub> PeLEDs. These findings provide valuable insights in the advancement of efficient CsPbI<sub>3</sub> PeLEDs.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"30 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ferroelectric photovoltaic has attracted increasing attention since its discovery in the 1970s, due to above bandgap photovoltage and polarized light-dependent photocurrent. However, its practical applications have been limited by weak visible light absorption and low photoconductivity. Intrinsic modification of the material, such as bandgap tuning through chemical doping, has proven effective but usually leads to the degradation of ferroelectricity. Recently, various nanostructures such as multilayer heterojunctions, nanoparticles, vertically aligned nanocomposites and polar nanoregions have been developed to enhance photovoltaic performance. These approaches enable nanoassembling materials in a lower dimension manner to optimize the bulk photovoltaic effect whilst effectively preserving or even inducing ferroelectricity. This review highlights the fabrication processes of these emerging ferroelectric nanostructures and evaluates their photovoltaic performance.
{"title":"Nanostructure Engineering for Ferroelectric Photovoltaics","authors":"Wenzhong Ji, Teng Lu, Yun Liu","doi":"10.1039/d4nr04908j","DOIUrl":"https://doi.org/10.1039/d4nr04908j","url":null,"abstract":"Ferroelectric photovoltaic has attracted increasing attention since its discovery in the 1970s, due to above bandgap photovoltage and polarized light-dependent photocurrent. However, its practical applications have been limited by weak visible light absorption and low photoconductivity. Intrinsic modification of the material, such as bandgap tuning through chemical doping, has proven effective but usually leads to the degradation of ferroelectricity. Recently, various nanostructures such as multilayer heterojunctions, nanoparticles, vertically aligned nanocomposites and polar nanoregions have been developed to enhance photovoltaic performance. These approaches enable nanoassembling materials in a lower dimension manner to optimize the bulk photovoltaic effect whilst effectively preserving or even inducing ferroelectricity. This review highlights the fabrication processes of these emerging ferroelectric nanostructures and evaluates their photovoltaic performance.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"5 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Anusha, Anjali Yadav, Pratap Vishnoi, Dharmendar Kumar Sharma
Mixing different metal ions in the B site of ABX3 perovskites offers a promising approach to address challenges related to toxicity, stability and performance in optoelectronic applications. One such example is CsPb1-xSnxBr3 which addresses the toxicity issue posed by lead while allowing us to tune optoelectronic properties such as band gap. In this work, nearly monodisperse CsPb1-xSnxBr3 quantum dots (QDs) synthesized with variable Pb/Sn compositions, i.e. CsPbBr3, CsPb0.9Sn0.1Br3 and CsPb0.7Sn0.3Br3. Photoluminescence quantum yield (PLQY) of CsPb1-xSnxBr3 first increases for x=0.1 and then decrease for x=0.3 with respect to x=0. Such effect of Sn incorporation on the PLQY investigated using photoblinking studies which revealed three level blinking statistics namely ON, GRAY and OFF. These results along with the excited state lifetime measurements enabled us to understand charge carrier dynamics in CsPb1-xSnxBr3 QDs. Based on our findings we propose that the photogenerated hot electrons of Sn enhances the PLQY by filling TRAP states centered on Pb, which otherwise promote non-radiative relaxations in the Sn free CsPbBr3. However, at higher Sn concentrations, non-radiative recombination becomes more pronounced, reducing the PLQY.
{"title":"Mixed Metal Halide Perovskite CsPb1-xSnxBr3 Quantum Dots: Insight into Photophysics from Photoblinking Studies","authors":"A. Anusha, Anjali Yadav, Pratap Vishnoi, Dharmendar Kumar Sharma","doi":"10.1039/d4nr04879b","DOIUrl":"https://doi.org/10.1039/d4nr04879b","url":null,"abstract":"Mixing different metal ions in the B site of ABX<small><sub>3</sub></small> perovskites offers a promising approach to address challenges related to toxicity, stability and performance in optoelectronic applications. One such example is CsPb<small><sub>1-x</sub></small>Sn<small><sub>x</sub></small>Br<small><sub>3</sub></small> which addresses the toxicity issue posed by lead while allowing us to tune optoelectronic properties such as band gap. In this work, nearly monodisperse CsPb<small><sub>1-x</sub></small>Sn<small><sub>x</sub></small>Br<small><sub>3</sub></small> quantum dots (QDs) synthesized with variable Pb/Sn compositions, i.e. CsPbBr<small><sub>3</sub></small>, CsPb<small><sub>0.9</sub></small>Sn<small><sub>0.1</sub></small>Br<small><sub>3</sub></small> and CsPb<small><sub>0.7</sub></small>Sn<small><sub>0.3</sub></small>Br<small><sub>3</sub></small>. Photoluminescence quantum yield (PLQY) of CsPb<small><sub>1-x</sub></small>Sn<small><sub>x</sub></small>Br<small><sub>3</sub></small> first increases for x=0.1 and then decrease for x=0.3 with respect to x=0. Such effect of Sn incorporation on the PLQY investigated using photoblinking studies which revealed three level blinking statistics namely ON, GRAY and OFF. These results along with the excited state lifetime measurements enabled us to understand charge carrier dynamics in CsPb<small><sub>1-x</sub></small>Sn<small><sub>x</sub></small>Br<small><sub>3</sub></small> QDs. Based on our findings we propose that the photogenerated hot electrons of Sn enhances the PLQY by filling TRAP states centered on Pb, which otherwise promote non-radiative relaxations in the Sn free CsPbBr<small><sub>3</sub></small>. However, at higher Sn concentrations, non-radiative recombination becomes more pronounced, reducing the PLQY.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"51 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987647","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}
Li Tian, Haodong Gu, Qiuqi Zhang, Xiao You, Mengmeng Wang, Feiyan Cai, Shaoming Dong, Jinshan Yang
Aerogel and its phase change composites are two reliable strategies for thermal management. However, the inherent instability of these porous structures hinders their further development and application. Herein, a robust boron nitride metamaterial (BNM) enhanced by the negative Poisson's ratio effect is proposed for dual thermal management strategies obtained by the sacrificial template method. The negative Poisson's ratio confers enhanced structural stability to the BNMs. On the one hand, the BNM exhibits resilience (5% residual strain after 100 cycles), temperature invariance, fire resistance, and thermal superinsulation at high temperatures (102.83 mW·m−1·K−1 at 1000 °C). On the other hand, the robust BNM overcomes structural deformation during the vacuum impregnation process to obtain isotropic phase change composites, achieving efficient thermal conductivity (1 W·m−1·K−1 with 4 vol% BNM) and thermal conductivity enhancement effect of 97%. These composites effectively encapsulate phase change materials, preventing liquefaction and leakage. This approach offers a reliable solution for simultaneously improving both the thermal management strategies.
{"title":"Robust Boron Nitride Metamaterials with Negative Poisson's Ratio for Dual Thermal Management Strategies","authors":"Li Tian, Haodong Gu, Qiuqi Zhang, Xiao You, Mengmeng Wang, Feiyan Cai, Shaoming Dong, Jinshan Yang","doi":"10.1002/adfm.202418111","DOIUrl":"https://doi.org/10.1002/adfm.202418111","url":null,"abstract":"Aerogel and its phase change composites are two reliable strategies for thermal management. However, the inherent instability of these porous structures hinders their further development and application. Herein, a robust boron nitride metamaterial (BNM) enhanced by the negative Poisson's ratio effect is proposed for dual thermal management strategies obtained by the sacrificial template method. The negative Poisson's ratio confers enhanced structural stability to the BNMs. On the one hand, the BNM exhibits resilience (5% residual strain after 100 cycles), temperature invariance, fire resistance, and thermal superinsulation at high temperatures (102.83 mW·m<sup>−1</sup>·K<sup>−1</sup> at 1000 °C). On the other hand, the robust BNM overcomes structural deformation during the vacuum impregnation process to obtain isotropic phase change composites, achieving efficient thermal conductivity (1 W·m<sup>−1</sup>·K<sup>−1</sup> with 4 vol% BNM) and thermal conductivity enhancement effect of 97%. These composites effectively encapsulate phase change materials, preventing liquefaction and leakage. This approach offers a reliable solution for simultaneously improving both the thermal management strategies.","PeriodicalId":112,"journal":{"name":"Advanced Functional Materials","volume":"29 1","pages":""},"PeriodicalIF":19.0,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The use of bioresorbable compositions has been considered a promising therapeutic approach for treating compromised bone tissues. Gellan gum (GG) is a predominant polysaccharide recognized for its exceptional biocompatibility and biodegradability, facile bio-fabrication, and customizable mechanical attributes, rendering it well-suited for developing versatile bone scaffolds. On the other hand, MXene nanosheets have been declared a representational filler to augment the osteogenic effect and amend the mechanical properties of the polymeric biomaterials. Herein, the GG/MXene system was formulated to investigate the synergistic impact of gellan gum and MXene on promoting bone tissue engineering. Accordingly, Ti3C2Tx MXene nanogalleries were synthesized and loaded with 1, 3, and 5 wt% ratios into the GG matrix to fortify the overall performances. Based on the outcomes, the GG containing 1 wt% MXene showed a homogeneous surface with an optimized topography, providing greater amorphous regions (15%), boosted hydrophilicity (27.5°), and a favorable Young's modulus (13.43 MPa). Additionally, the designed scaffold provided exceptional osteogenetic adhesion and bactericidal behavior against both Gram-positive (S. aureus) and -negative (E. coli) bacteria. To achieve more desirable biological performance, 1 ml garlic extract (GA) was introduced to the freeze-dried composite network. The results exhibited better cell attachment in the porous GA-mediated scaffold with furthered antibacterial features through an increase in the zone diameter breakpoint from 4.8 ± 0.2 and 5.0 ± 0.1 mm to 5.9 ± 0.3 and 6.2 ± 0.2 mm against S. aureus and E. coli, respectively. Therefore, embedding GA, alongside MXene layered nanomaterials, into the GG-based matrix could provide a convenient scaffolding architecture for guided bone regeneration, facilitating appropriate cell attachment, growth, and proliferation.
{"title":"Multipurpose triadic MXene/garlic/gellan gum-based architecture in the horizon of bone tissue regeneration","authors":"Lin Zhou, Zhuo Zhao, Seyedeh Nooshin Banitaba, Sanaz Khademolqorani, Xin Han, Guang Chen","doi":"10.1039/d4nr03995e","DOIUrl":"https://doi.org/10.1039/d4nr03995e","url":null,"abstract":"The use of bioresorbable compositions has been considered a promising therapeutic approach for treating compromised bone tissues. Gellan gum (GG) is a predominant polysaccharide recognized for its exceptional biocompatibility and biodegradability, facile bio-fabrication, and customizable mechanical attributes, rendering it well-suited for developing versatile bone scaffolds. On the other hand, MXene nanosheets have been declared a representational filler to augment the osteogenic effect and amend the mechanical properties of the polymeric biomaterials. Herein, the GG/MXene system was formulated to investigate the synergistic impact of gellan gum and MXene on promoting bone tissue engineering. Accordingly, Ti<small><sub>3</sub></small>C<small><sub>2</sub></small>T<small><sub><em>x</em></sub></small> MXene nanogalleries were synthesized and loaded with 1, 3, and 5 wt% ratios into the GG matrix to fortify the overall performances. Based on the outcomes, the GG containing 1 wt% MXene showed a homogeneous surface with an optimized topography, providing greater amorphous regions (15%), boosted hydrophilicity (27.5°), and a favorable Young's modulus (13.43 MPa). Additionally, the designed scaffold provided exceptional osteogenetic adhesion and bactericidal behavior against both Gram-positive (<em>S. aureus</em>) and -negative (<em>E. coli</em>) bacteria. To achieve more desirable biological performance, 1 ml garlic extract (GA) was introduced to the freeze-dried composite network. The results exhibited better cell attachment in the porous GA-mediated scaffold with furthered antibacterial features through an increase in the zone diameter breakpoint from 4.8 ± 0.2 and 5.0 ± 0.1 mm to 5.9 ± 0.3 and 6.2 ± 0.2 mm against <em>S. aureus</em> and <em>E. coli</em>, respectively. Therefore, embedding GA, alongside MXene layered nanomaterials, into the GG-based matrix could provide a convenient scaffolding architecture for guided bone regeneration, facilitating appropriate cell attachment, growth, and proliferation.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"37 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987765","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}
Rapid kinetics and stable atom configuration of the catalysts are essential and greatly sought after for bifunctional oxygen reactions and energy conversion devices, but remain unsatisfactory. Herein, the Se dual atoms structure consisting of the periodically arranged Se-P-Se configurations within graphitic nitrogen carbon framework (P-Se dual atoms-NC) is constructed by P directionally mediated single atoms deposition strategy. The in situ/ex situ experiments combining the theoretical calculations reveal that both the inter-site distance effect of the adjacent Se atoms in the NC and the Se-P binding effect endow P-Se dual atoms-NC with a stable atom configuration and ultra-durable lifespan, and the locally polarized electronic micro-environment built by P 2p-Se 3d-C 2p orbital hybridization and the electrons transfer significantly promotes H2O-O2 coupling, boosts the adsorption/desorption of O-intermediates and accelerates the electron transport kinetics. Moreover, the adjacent Se atoms with a periodically arranged structure could provide more sites for the absorption and conversion of reactants. Thus, the as-prepared catalyst exhibits the top-level bifunctional activity with an ultra-low potential difference (ΔE) of 0.58 V and delivers the outstandingly low-temperature specific capacity of 796.41 mAh gZn−1 and the ultra-durable lifespan over 1000 h for assembled zinc-air batteries at −40 °C.
{"title":"Phosphorus-Mediated Selenium Dual Atoms for Bifunctional Oxygen Reactions and Long-Life Low-Temperature Energy Conversion","authors":"Lingzhi Xia, Jianhua Zhang, Pengfei Yan, Kai-Ling Zhou, Yuhong Jin, Xiaoxing Ke, Jingbin Liu, Hao Wang","doi":"10.1002/adfm.202423476","DOIUrl":"https://doi.org/10.1002/adfm.202423476","url":null,"abstract":"Rapid kinetics and stable atom configuration of the catalysts are essential and greatly sought after for bifunctional oxygen reactions and energy conversion devices, but remain unsatisfactory. Herein, the Se dual atoms structure consisting of the periodically arranged Se-P-Se configurations within graphitic nitrogen carbon framework (P-Se dual atoms-NC) is constructed by P directionally mediated single atoms deposition strategy. The in situ/ex situ experiments combining the theoretical calculations reveal that both the inter-site distance effect of the adjacent Se atoms in the NC and the Se-P binding effect endow P-Se dual atoms-NC with a stable atom configuration and ultra-durable lifespan, and the locally polarized electronic micro-environment built by P 2<i>p</i>-Se 3<i>d</i>-C 2<i>p</i> orbital hybridization and the electrons transfer significantly promotes H<sub>2</sub>O-O<sub>2</sub> coupling, boosts the adsorption/desorption of O-intermediates and accelerates the electron transport kinetics. Moreover, the adjacent Se atoms with a periodically arranged structure could provide more sites for the absorption and conversion of reactants. Thus, the as-prepared catalyst exhibits the top-level bifunctional activity with an ultra-low potential difference (Δ<i>E</i>) of 0.58 V and delivers the outstandingly low-temperature specific capacity of 796.41 mAh g<sub>Zn</sub><sup>−1</sup> and the ultra-durable lifespan over 1000 h for assembled zinc-air batteries at −40 °C.","PeriodicalId":112,"journal":{"name":"Advanced Functional Materials","volume":"8 1","pages":""},"PeriodicalIF":19.0,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The 90-year-old Hume–Rothery rule was adapted to design an outstanding bifunctional tetra-metallic alloy electrocatalyst for water electrolysis. Following the radius mismatch principles, Fe (131 pm) and Ni (124 pm) are selectively incorporated at the Pd (139 pm) site of Mo0.30Pd0.70 nanosheets. Analogously, Cu (132 pm) alloys with only Pd, while Ag (145 pm) alloys with both Pd and Mo (154 pm). The face-centered cubic Mo0.30Pd0.35Ni0.23Fe0.12 nanosheets with 10–12 atomic layers, featuring in-plane compressive strain along the {111} basal plane, show 1/3 (422) reflection from local hexagonal symmetry. The more electronegative Pd attracts electron density from Ni/Fe in Mo0.30Pd0.35Ni0.23Fe0.12, synergistically boosting the mass activities for hydrogen and oxygen evolution reactions to 89 ± 5 and 38.6 ± 3.1 A g–1 at ±400 mV versus RHE, respectively. Full water electrolysis continues for ≥550 h, requiring cell voltages of 1.51 and 1.63 V at 10 and 100 mA cm–2, delivering 45 mL h–1 green H2.
{"title":"Decoding the Hume–Rothery Rule in a Bifunctional Tetra-metallic Alloy for Alkaline Water Electrolysis","authors":"Surajit Mondal, Supriti Dutta, Vishwadeepa Hazra, Swapan K. Pati, Sayan Bhattacharyya","doi":"10.1021/acs.nanolett.4c04412","DOIUrl":"https://doi.org/10.1021/acs.nanolett.4c04412","url":null,"abstract":"The 90-year-old Hume–Rothery rule was adapted to design an outstanding bifunctional tetra-metallic alloy electrocatalyst for water electrolysis. Following the radius mismatch principles, Fe (131 pm) and Ni (124 pm) are selectively incorporated at the Pd (139 pm) site of Mo<sub>0.30</sub>Pd<sub>0.70</sub> nanosheets. Analogously, Cu (132 pm) alloys with only Pd, while Ag (145 pm) alloys with both Pd and Mo (154 pm). The face-centered cubic Mo<sub>0.30</sub>Pd<sub>0.35</sub>Ni<sub>0.23</sub>Fe<sub>0.12</sub> nanosheets with 10–12 atomic layers, featuring in-plane compressive strain along the {111} basal plane, show 1/3 (422) reflection from local hexagonal symmetry. The more electronegative Pd attracts electron density from Ni/Fe in Mo<sub>0.30</sub>Pd<sub>0.35</sub>Ni<sub>0.23</sub>Fe<sub>0.12</sub>, synergistically boosting the mass activities for hydrogen and oxygen evolution reactions to 89 ± 5 and 38.6 ± 3.1 A g<sup>–1</sup> at ±400 mV versus RHE, respectively. Full water electrolysis continues for ≥550 h, requiring cell voltages of 1.51 and 1.63 V at 10 and 100 mA cm<sup>–2</sup>, delivering 45 mL h<sup>–1</sup> green H<sub>2</sub>.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"27 1","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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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