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Sustainable Electrospun Hybrid Nanofibers for Triboelectric Nanogenerators

IF 13.3 2区材料科学

Small Pub Date : 2025-01-29 DOI: 10.1002/smll.202410271

Sweetly Thomas-Kochakkadan, Marcos Duque, Gonzalo Murillo, Viraj P. Nirwan, Amir Fahmi

{"title":"Sustainable Electrospun Hybrid Nanofibers for Triboelectric Nanogenerators","authors":"Sweetly Thomas-Kochakkadan, Marcos Duque, Gonzalo Murillo, Viraj P. Nirwan, Amir Fahmi","doi":"10.1002/smll.202410271","DOIUrl":"https://doi.org/10.1002/smll.202410271","url":null,"abstract":"Triboelectric nanogenerators (TENGs) have emerged as potential energy-harvesting modules for miniaturized devices. TENG modules are derived often from components having low sustainability whereas the current environmental and economic circumstances demand a focus on sustainable, ecologically friendly approaches for the development of advanced hybrid materials. Herein, recycled polyethylene terephthalate (PET) along with commercially available nylon are electrospun into nanofibers for TENG devices. The obtained nanofibers are characterized using microscopy, spectroscopy, and thermal and mechanical analysis. Electrospinning of pristine and titanium dioxide nanoparticles (TiO2 NPs) blended polymer solutions resulted in uniform nanofibers without beads. The addition of TiO2 NPs improved the thermal properties and significantly improved the mechanical stability of the nanofibers. The performance of the fabricated TENG device has been improved by functionalizing the nanofibers with TiO2 NPs. Particularly, the combination of pristine PET and TiO2 NPs (5%) functionalized nylon nanofibers reached a peak power density of 23.44 mW m−2 with a surface charge density of 6.81 µC m−2, a max output voltage of 111 V and a max current of −1.61µA. This study opens a new avenue to utilize upcycled cost-effective polymers processed using electrospinning as a powerful tool for the fabrication of the next generation of sustainable TENG devices.","PeriodicalId":228,"journal":{"name":"Small","volume":"22 1","pages":""},"PeriodicalIF":13.3,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143057271","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}

引用次数: 0

Tuning of Oxygen Vacancies in Co3O4 Electrocatalyst for Effectiveness in Urea Oxidation and Water Splitting (Small 4/2025)

IF 13.3 2区材料科学

Small Pub Date : 2025-01-29 DOI: 10.1002/smll.202570027

Pandian Mannu, Ranjith Kumar Dharman, Ta Thi Thuy Nga, Athibala Mariappan, Yu-Cheng Shao, Hirofumi Ishii, Yu-Cheng Huang, Asokan Kandasami, Tae Hwan Oh, Wu-Ching Chou, Chi-Liang Chen, Jeng-Lung Chen, Chung-Li Dong

引用次数: 0

Unlocking Peak Efficiency in Anion-Exchange Membrane Electrolysis with Iridium-Infused Ni/Ni2P Heterojunction Electrocatalysts

IF 13.3 2区材料科学

Small Pub Date : 2025-01-29 DOI: 10.1002/smll.202410986

Balaji S. Salokhe, Thanh Tuan Nguyen, Rohit Singh Rawat, Hewei Song, Nam Hoon Kim, Joong Hee Lee

{"title":"Unlocking Peak Efficiency in Anion-Exchange Membrane Electrolysis with Iridium-Infused Ni/Ni2P Heterojunction Electrocatalysts","authors":"Balaji S. Salokhe, Thanh Tuan Nguyen, Rohit Singh Rawat, Hewei Song, Nam Hoon Kim, Joong Hee Lee","doi":"10.1002/smll.202410986","DOIUrl":"https://doi.org/10.1002/smll.202410986","url":null,"abstract":"Developing cost-effective, highly efficient, and durable bifunctional electrocatalysts for water electrolysis remains a significant challenge. Nickel-based materials have shown promise as catalysts, but their efficiency in alkaline electrolytes is still lacking. Fascinatingly, Mott–Schottky catalysts can fine-tune electron density at interfaces, boosting intermediate adsorption and facilitating desorption to reduce the energy barrier. In this study, iridium-implanted Mott–Schottky Ni/Ni2P nanosheets (IrSA–Ni/Ni2P) is introduced, which are delivered from the metal–organic framework and employ them as the bifunctional catalysts for water electrolysis devices. This catalyst requires a small 54 mV overpotential for hydrogen evolution reaction (HER) and 192 mV for oxygen evolution reaction (OER) to reach 10 mA·cm−2 in a 1.0 m KOH electrolyte. Density functional theory (DFT) calculations reveal that the incorporation of Ir atoms with enriched interfaces between Ni and Ni2P can promote the active sites and be favorable for the HER and OER. This discovery highlights the most likely reactive sites and offers a valuable blueprint for designing highly efficient and stable catalysts tailored for industrial-scale electrolysis. The IrSA-Ni/Ni2P electrode exhibits exceptional current density and outstanding stability in a single-cell anion-exchange membrane electrolyzer.","PeriodicalId":228,"journal":{"name":"Small","volume":"48 1","pages":""},"PeriodicalIF":13.3,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143057275","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}

引用次数: 0

Controlled Release of Hydrophilic Drug from Hollow Nanodots

IF 13.3 2区材料科学

Small Pub Date : 2025-01-29 DOI: 10.1002/smll.202409112

Patitta Preedanorawut, Orawan Chatchawankanphanich, Doungporn Yiamsawas, Daniel Crespy

引用次数: 0

Deciphering the Impact of Current, Composition, and Potential on the Lithiation Behavior of Si-Rich Silicon-Graphite Anodes (Small 4/2025) 解读电流、成分和电位对富硅石墨阳极锂化行为的影响（Small 4/2025）

IF 13.3 2区材料科学

Small Pub Date : 2025-01-29 DOI: 10.1002/smll.202570029

Philipp Schweigart, Weicheng Hua, Pedro Alonso Sánchez, Camilla Lian, Inger-Emma Nylund, David Wragg, Samson Yuxiu Lai, Federico Cova, Ann Mari Svensson, Maria Valeria Blanco

引用次数: 0

Defect-Engineered Biomimetic Piezoelectric Nanocomposites With Enhanced ROS Production, Macrophage Re-polarization, and Ca2+ Channel Activation for Therapy of MRSA-Infected Wounds and Osteomyelitis

IF 13.3 2区材料科学

Small Pub Date : 2025-01-29 DOI: 10.1002/smll.202411906

Shubham Roy, Shaohua Wang, Zia Ullah, Huiyao Hao, Renhao Xu, Jhilik Roy, Tingting Gong, Ikram Hasan, Wei Jiang, Menglong Li, Dhananjoy Mondal, Jihong Li, Jian Jin, Yinghe Zhang, Wujiong Xia, Bing Guo

{"title":"Defect-Engineered Biomimetic Piezoelectric Nanocomposites With Enhanced ROS Production, Macrophage Re-polarization, and Ca2+ Channel Activation for Therapy of MRSA-Infected Wounds and Osteomyelitis","authors":"Shubham Roy, Shaohua Wang, Zia Ullah, Huiyao Hao, Renhao Xu, Jhilik Roy, Tingting Gong, Ikram Hasan, Wei Jiang, Menglong Li, Dhananjoy Mondal, Jihong Li, Jian Jin, Yinghe Zhang, Wujiong Xia, Bing Guo","doi":"10.1002/smll.202411906","DOIUrl":"https://doi.org/10.1002/smll.202411906","url":null,"abstract":"Antibiotic-resistant bacteria often cause lethal infections in both the surficial and deep organs of humans. Failure of antibiotics in resistant infections leads to more effective alternative therapies, like spatiotemporally controllable piezodynamic therapy (PZDT) with deep penetration. Currently, PZDT demands further investigation for improved treatment outcomes and the corresponding therapeutic mechanisms. Herein, a nanocomposite cloaked is reported with a biomimetic coating of TLR-upregulated macrophage membrane for targeted PZDT against MRSA-induced skin wound infection and osteomyelitis, representing surficial and deep infection models, respectively. To boost the therapeutic efficacy, crystal defect engineering is applied by impregnating Fe2+ into bismuth oxy-iodide nanosheets to increase the crystal defects. This results in a significantly higher piezoelectric coefficient than in previous reports, contributing to an amplified reactive oxygen species generation for bacterial killing. More importantly, the notable piezoelectric effect not only re-programs the macrophages into an anti-inflammatory M2 phenotype for accelerating bacterial wound healing but also stimulates the opening of the piezo-stimulated Ca2+ channels and boosts the differentiation of mesenchymal stem cells into osteoblasts for expediting bone tissue repair in osteomyelitis model. Moreover, the Fe-doping supplements T2-magnetic resonance imaging for real-time visualization of nanocomposite distribution. This theranostic system opens a new avenue for future treatment of drug-resistant bacteria-caused diseases.","PeriodicalId":228,"journal":{"name":"Small","volume":"74 1","pages":""},"PeriodicalIF":13.3,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143056399","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}

引用次数: 0

Color Tuning and Efficiency Enhancement of Transparent c-Si Solar Cells with Ag/TiO2 Double Layer

IF 13.3 2区材料科学

Small Pub Date : 2025-01-29 DOI: 10.1002/smll.202409487

Kangmin Lee, Jiwoo Yeop, Jeonghwan Park, Jung Geon Son, Jin Young Kim, Kwanyong Seo

引用次数: 0

Interconnected Lamellar 3D Semiconductive PCP for Rechargeable Aqueous Zinc Battery Cathodes

IF 13.3 2区材料科学

Small Pub Date : 2025-01-29 DOI: 10.1002/smll.202411386

Zirui Lin, Ken-ichi Otake, Takashi Kajiwara, Shotaro Hiraide, Maryam Nurhuda, Daniel Packwood, Kentaro Kadota, Hirotoshi Sakamoto, Shogo Kawaguchi, Yoshiki Kubota, Ming-Shui Yao, Satoshi Horike, Xiaoqi Sun, Susumu Kitagawa

{"title":"Interconnected Lamellar 3D Semiconductive PCP for Rechargeable Aqueous Zinc Battery Cathodes","authors":"Zirui Lin, Ken-ichi Otake, Takashi Kajiwara, Shotaro Hiraide, Maryam Nurhuda, Daniel Packwood, Kentaro Kadota, Hirotoshi Sakamoto, Shogo Kawaguchi, Yoshiki Kubota, Ming-Shui Yao, Satoshi Horike, Xiaoqi Sun, Susumu Kitagawa","doi":"10.1002/smll.202411386","DOIUrl":"https://doi.org/10.1002/smll.202411386","url":null,"abstract":"2D electronically conductive porous coordination polymers/metal–organic frameworks (2D EC-MOFs) of M-HHTPs (HHTP = 2,3,6,7,10,11-hexahydroxytriphenylene; M = Co, Ni, Cu, etc.) have received extensive attention due to their ease of preparation, semiconductive properties, and tunability based on the choice of metal species. However, slight shifts between layers attenuate their specific surface area and stability. In this study, the metal-ion bridge strategy is newly adopted and a vanadyl counterpart of M-HHTP is synthesized with a chemical formula of (VO)3(HHTP)2, hereafter referred to as VO-HHTP. The semiconductor VO-HHTP has a vertical interconnection by octahedral VO6 chains and exhibits a relatively high specific surface area (ca. 590 m2 g−1) compared to other 2D EC-MOFs. Motivated by its redox activity and porous nature, VO-HHTP is applied as the cathode material in rechargeable aqueous zinc batteries (RAZBs). VO-HHTP demonstrates a high capacity of 240 mAh g−1 and excellent rate capability, even with a reduced amount of conductive agent, surpassing the performance of the previous EC-MOFs. Furthermore, its stable structure ensures long-term cycling stability, addressing a common issue in previous EC-MOFs. The work contributes to the development of new concepts in both the design of π-conjugated EC-MOFs and the study of cathode materials for RAZBs.","PeriodicalId":228,"journal":{"name":"Small","volume":"29 1","pages":""},"PeriodicalIF":13.3,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143057268","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}

引用次数: 0

Elucidating Mesostructural Effects on Thermal Conductivity for Enhanced Insulation Applications

IF 13.3 2区材料科学

Small Pub Date : 2025-01-28 DOI: 10.1002/smll.202410872

Tingting Ren, Zhenxiang Chen, Jiahao Chen, Xirui Huang, Xingjin Li, Jie Zhang, Qianqian Lu, Chin-Te Hung, Tiancong Zhao, Min Wang, Dongyuan Zhao

{"title":"Elucidating Mesostructural Effects on Thermal Conductivity for Enhanced Insulation Applications","authors":"Tingting Ren, Zhenxiang Chen, Jiahao Chen, Xirui Huang, Xingjin Li, Jie Zhang, Qianqian Lu, Chin-Te Hung, Tiancong Zhao, Min Wang, Dongyuan Zhao","doi":"10.1002/smll.202410872","DOIUrl":"https://doi.org/10.1002/smll.202410872","url":null,"abstract":"Thermal management is a key link in improving energy utilization and preparing insulation materials with excellent performance is the core technological issue. Complex and irregular pore structures of insulation materials hinder the exploration of structure-property relationships and the further promotion of material performance. Ordered mesoporous silica (OMS) is a kind of porous material with ordered frameworks. This work elucidates the effects of ordered porous architecture on the thermal conductivity of mesoporous silica. Herein, two typical OMS, SBA-15 and SBA-16, characterized by well-defined porous structures with distinct spatial orientations are synthesized to study the relevance between structure and thermal conductivity. Compared to the 3D cubic mesoporous structure of SBA-16, the 2D hexagonal structure of SBA-15 exhibits anisotropic effects that restrict both solid and gaseous conduction, thereby providing better thermal insulating. Due to the influence of porosity, the thermal conductivity is found to decrease strongly with increasing pore size and decreasing wall thickness. Moreover, OMS composite aerogels with outstanding thermal insulation, mechanical performance, and hydrophobicity are fabricated through incorporating OMS into cellulose nanofibers (CNF). Consequently, this work contributes to a deeper understanding of heat transfer in OMS and provides an idea for designing OMS-based composite materials, thereby advancing their potential applications.","PeriodicalId":228,"journal":{"name":"Small","volume":"24 1","pages":""},"PeriodicalIF":13.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143050895","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}

引用次数: 0

Deep-Learning-Enabled Fast Raman Identification of the Twist Angle of Bi-Layer Graphene

IF 13.3 2区材料科学

Small Pub Date : 2025-01-28 DOI: 10.1002/smll.202411833

Yangbo Chen, Cheng Li, Shan Liu, Shikun Gao, Chenyi Huang, Xin Yu, Xiangrui Xu, Haibo Ke, Dezhen Xue, Gui Yu, Zhe Liu, Mengyan Dai, Xueao Zhang

{"title":"Deep-Learning-Enabled Fast Raman Identification of the Twist Angle of Bi-Layer Graphene","authors":"Yangbo Chen, Cheng Li, Shan Liu, Shikun Gao, Chenyi Huang, Xin Yu, Xiangrui Xu, Haibo Ke, Dezhen Xue, Gui Yu, Zhe Liu, Mengyan Dai, Xueao Zhang","doi":"10.1002/smll.202411833","DOIUrl":"https://doi.org/10.1002/smll.202411833","url":null,"abstract":"Twisted bilayer graphene (TBG) has drawn considerable attention due to its angle-dependent electrical, optical, and mechanical properties, yet preparing and identifying samples at specific angles on a large scale remains challenging and labor-intensive. Here, a data-driven strategy that leverages Raman spectroscopy is proposed in combination with deep learning to rapidly and non-destructively decode and predict the twist angle of TBG across the full angular range. By processing high-dimensional Raman data, the deep learning model extracts hidden information to achieve precise twist angle identification. This approach is further extended to a 2D plane, enabling accurate orientational mapping within individual samples. Through interpretability analysis, the model is validated in conjunction with first-principles theoretical calculations, ensuring robust and explainable results. This data-driven methodology not only facilitates efficient TBG characterization but also introduces a broadly applicable framework for studying other angle-dependent 2D materials, thereby advancing the field of material spectroscopy and analysis.","PeriodicalId":228,"journal":{"name":"Small","volume":"23 1","pages":""},"PeriodicalIF":13.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143050930","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}

引用次数: 0