Zanxin Zhou, Xinkai Xu, Jialin Hu, Hongyu Zhao, Shuang Li, Kai Chen, Qi Gu, Yewang Su
Acne, the most prevalent chronic inflammatory skin condition, significantly impacts patients’ quality of life and mental health. Radiofrequency (RF) therapy offers a deep heating effect, devoid of antibiotic resistance, and side effects in pharmacological treatments, while avoiding the skin-type limitations in phototherapy. However, conventional RF devices face challenges associated with long-time hand-held use and short effective treatment-duration due to small sizes and continuous movement of the probe. Consequently, the stretchable electronic facial mask for radiofrequency therapy (SEFM-RFT) is presented for large-area treatment and hands-free operation. A radiofrequency-array heating model is proposed to ensure the therapeutic efficacy and safety, and an adsorption hot-pressing packaging technique is developed to maintain close skin contact. Animal experiments demonstrate that SEFM-RFT reduces the number of lesions by 78%, while the effect on acne recovery is proved through bacterial and histochemical experiments. The development of SEFM-RFT represents a significant advancement in flexible electrical therapy devices.
{"title":"Stretchable Electronic Facial Masks for Radiofrequency Therapy","authors":"Zanxin Zhou, Xinkai Xu, Jialin Hu, Hongyu Zhao, Shuang Li, Kai Chen, Qi Gu, Yewang Su","doi":"10.1002/adfm.202421075","DOIUrl":"https://doi.org/10.1002/adfm.202421075","url":null,"abstract":"Acne, the most prevalent chronic inflammatory skin condition, significantly impacts patients’ quality of life and mental health. Radiofrequency (RF) therapy offers a deep heating effect, devoid of antibiotic resistance, and side effects in pharmacological treatments, while avoiding the skin-type limitations in phototherapy. However, conventional RF devices face challenges associated with long-time hand-held use and short effective treatment-duration due to small sizes and continuous movement of the probe. Consequently, the stretchable electronic facial mask for radiofrequency therapy (SEFM-RFT) is presented for large-area treatment and hands-free operation. A radiofrequency-array heating model is proposed to ensure the therapeutic efficacy and safety, and an adsorption hot-pressing packaging technique is developed to maintain close skin contact. Animal experiments demonstrate that SEFM-RFT reduces the number of lesions by 78%, while the effect on acne recovery is proved through bacterial and histochemical experiments. The development of SEFM-RFT represents a significant advancement in flexible electrical therapy devices.","PeriodicalId":112,"journal":{"name":"Advanced Functional Materials","volume":"54 1","pages":""},"PeriodicalIF":19.0,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987200","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}
Can Wang, Zeping Ou, Yi Pan, Nabonswende Aida Nadege Ouedraogo, Peidong Chen, Qin Gao, Ke Yang, Hongliang Lei, Yunfei Ouyang, Wei Wan, Mingyang Gao, Zhiwei Wu, Deyong Peng, Tingming Jiang, Kuan Sun
Defect density on the perovskite film surface significantly exceeds that found in the bulk, primarily due to the presence of dangling bonds and excessive strain. Herein, a synergistic surface engineering is reported aimed at reducing surface defects of perovskite films. This method involves subjecting the thermally-annealed perovskite films to a controlled cooling condition involving an ambient environment with regulated humidity, as opposed to a nitrogen environment, followed by phenethylammonium iodide (PEAI) passivation. The perovskite films treated with moisture cooling (MC) exhibit enhanced radiative recombination, prolonged charge carrier lifetime, and improved hole transport and extraction when in contact with the hole transport layer (HTL), alongside a significant reduction in strain. Notably, the passivation effect of PEAI on the MC-treated perovskite films is significantly amplified compared with the films subjected to nitrogen cooling (NC) treatment, as evidenced by a more uniform surface potential mapping and a markedly extended charge carrier lifetime. This enhanced passivation effect may arise from the higher ratio of newly-formed 2D perovskite phase PEA2FAPb2I7 to PEA2PbI4 in the MC-treated film. Consequently, the MC-based perovskite solar cell (PSC) achieves a champion power conversion efficiency (PCE) of 25.28%, surpassing that of the NC-treated device, which exhibits a PCE of only 24.01%.
{"title":"Surface Engineering of Perovskite Films via Sequential Moisture Cooling and Passivation for Efficient Solar Cells","authors":"Can Wang, Zeping Ou, Yi Pan, Nabonswende Aida Nadege Ouedraogo, Peidong Chen, Qin Gao, Ke Yang, Hongliang Lei, Yunfei Ouyang, Wei Wan, Mingyang Gao, Zhiwei Wu, Deyong Peng, Tingming Jiang, Kuan Sun","doi":"10.1002/adfm.202420084","DOIUrl":"https://doi.org/10.1002/adfm.202420084","url":null,"abstract":"Defect density on the perovskite film surface significantly exceeds that found in the bulk, primarily due to the presence of dangling bonds and excessive strain. Herein, a synergistic surface engineering is reported aimed at reducing surface defects of perovskite films. This method involves subjecting the thermally-annealed perovskite films to a controlled cooling condition involving an ambient environment with regulated humidity, as opposed to a nitrogen environment, followed by phenethylammonium iodide (PEAI) passivation. The perovskite films treated with moisture cooling (MC) exhibit enhanced radiative recombination, prolonged charge carrier lifetime, and improved hole transport and extraction when in contact with the hole transport layer (HTL), alongside a significant reduction in strain. Notably, the passivation effect of PEAI on the MC-treated perovskite films is significantly amplified compared with the films subjected to nitrogen cooling (NC) treatment, as evidenced by a more uniform surface potential mapping and a markedly extended charge carrier lifetime. This enhanced passivation effect may arise from the higher ratio of newly-formed 2D perovskite phase PEA<sub>2</sub>FAPb<sub>2</sub>I<sub>7</sub> to PEA<sub>2</sub>PbI<sub>4</sub> in the MC-treated film. Consequently, the MC-based perovskite solar cell (PSC) achieves a champion power conversion efficiency (PCE) of 25.28%, surpassing that of the NC-treated device, which exhibits a PCE of only 24.01%.","PeriodicalId":112,"journal":{"name":"Advanced Functional Materials","volume":"8 1","pages":""},"PeriodicalIF":19.0,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987561","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}
Solid composite electrolytes (SCEs) composed of functional fillers and solid polymer electrolytes (SPEs) can overcome some shortcomings of single‐phase and combine some advantages of each component, and are considered as high‐performance solid‐state electrolytes (SSEs) candidates for assembling solid‐state lithium metal batteries (SSLMBs) with high safety and high energy density. In recent years, due to high designability of metal–organic frameworks (MOFs), MOFs/polymer composite electrolytes (MPCEs) have become a highly promising novel type of SCEs. Based on the above content, this article first describes the composition and mechanism of action of MPCEs, followed by a discussion on typical fabrication methods for MPCEs. In addition, the mechanisms of unmodified neat MOFs in improving performance for SSEs and enhancing interface stability are presented in detail, with a focus on the design strategies of MOFs and their applications in MPCEs, including dimensional design, ligand design, IL@MOFs design, and hybrid design. Finally, a thorough analysis is conducted on the current challenges faced by MPCEs, and corresponding future development directions are proposed. This review presents a comprehensive, systematic, and easily understandable analysis of the application and mechanism of action of different MOFs designs in MPCEs, providing a new perspective for researchers to study high‐performance SSEs.
{"title":"Design Strategies, Characterization Mechanisms, and Applications of MOFs in Polymer Composite Electrolytes for Solid‐State Lithium Metal Batteries","authors":"Honggui He, Nanping Deng, Xiaoyin Wang, Lu Gao, Chuqing Tang, Enjie Wu, Junguang Ren, Xianbo Yang, Nini Feng, Dezhou Gao, Xupin Zhuang","doi":"10.1002/adfm.202421670","DOIUrl":"https://doi.org/10.1002/adfm.202421670","url":null,"abstract":"Solid composite electrolytes (SCEs) composed of functional fillers and solid polymer electrolytes (SPEs) can overcome some shortcomings of single‐phase and combine some advantages of each component, and are considered as high‐performance solid‐state electrolytes (SSEs) candidates for assembling solid‐state lithium metal batteries (SSLMBs) with high safety and high energy density. In recent years, due to high designability of metal–organic frameworks (MOFs), MOFs/polymer composite electrolytes (MPCEs) have become a highly promising novel type of SCEs. Based on the above content, this article first describes the composition and mechanism of action of MPCEs, followed by a discussion on typical fabrication methods for MPCEs. In addition, the mechanisms of unmodified neat MOFs in improving performance for SSEs and enhancing interface stability are presented in detail, with a focus on the design strategies of MOFs and their applications in MPCEs, including dimensional design, ligand design, IL@MOFs design, and hybrid design. Finally, a thorough analysis is conducted on the current challenges faced by MPCEs, and corresponding future development directions are proposed. This review presents a comprehensive, systematic, and easily understandable analysis of the application and mechanism of action of different MOFs designs in MPCEs, providing a new perspective for researchers to study high‐performance SSEs.","PeriodicalId":112,"journal":{"name":"Advanced Functional Materials","volume":"94 1","pages":""},"PeriodicalIF":19.0,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142986058","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}
Orhan Sisman, Oksana Smirnova, Yang Xia, Nadja Greiner-Mai, Aaron Reupert, Vahid Nozari, Jose J. Velazquez, Dusan Galusek, Alexander Knebel, Lothar Wondraczek
Hybrid glasses derived from meltable metal-organic frameworks (MOFs) have emerged as a new class of amorphous materials. Combining the porosity of MOFs with the processing ability of glasses, they are thought to enable a wholly new range of functional compounds. By way of example, it is demonstrated here how the intrinsic porosity of glasses obtained from zeolitic imidazolates (ZIFs) can be used to overcome the selectivity-sensitivity trade-off in electroactive gas sensing. For this, composites are fabricated in which metallophthalocyanines are embedded within a ZIF-62 MOF glass matrix. Such a material enables the detection of gas species (or their absence) utilizing the pronounced electrochemical sensitivity of phthalocyanines. Thereby, the solid glass does not only stabilize and protect the active component, but also – through its retained, highly tunable porosity – ensures sensor selectivity by molecular sieving and targeted size exclusion of larger molecules. In addition, the hydrophobicity of the ZIF pore interior protects the active component from degradation caused by ambient humidity. Investigations of the structural, optical and electronic properties of the composite indicate that compoundation is purely physical, that is, chemical interactions between the compound partners are avoided and the individual properties of the hybrid glass matrix and the electroactive metallophthalocyanine are retained. Atmosphere-controlled high-temperature electrical impedance measurements reveal significant shifts in resistance in CO2 and Ar atmosphere as compared to airflow. These results provide a proof of concept for sensitive and selective gas sensors based on such composites.
{"title":"Overcoming the Selectivity-Sensitivity Trade-Off in Electroactive Gas Sensing Using Hybrid Glass Composites","authors":"Orhan Sisman, Oksana Smirnova, Yang Xia, Nadja Greiner-Mai, Aaron Reupert, Vahid Nozari, Jose J. Velazquez, Dusan Galusek, Alexander Knebel, Lothar Wondraczek","doi":"10.1002/adfm.202416535","DOIUrl":"https://doi.org/10.1002/adfm.202416535","url":null,"abstract":"Hybrid glasses derived from meltable metal-organic frameworks (MOFs) have emerged as a new class of amorphous materials. Combining the porosity of MOFs with the processing ability of glasses, they are thought to enable a wholly new range of functional compounds. By way of example, it is demonstrated here how the intrinsic porosity of glasses obtained from zeolitic imidazolates (ZIFs) can be used to overcome the selectivity-sensitivity trade-off in electroactive gas sensing. For this, composites are fabricated in which metallophthalocyanines are embedded within a ZIF-62 MOF glass matrix. Such a material enables the detection of gas species (or their absence) utilizing the pronounced electrochemical sensitivity of phthalocyanines. Thereby, the solid glass does not only stabilize and protect the active component, but also – through its retained, highly tunable porosity – ensures sensor selectivity by molecular sieving and targeted size exclusion of larger molecules. In addition, the hydrophobicity of the ZIF pore interior protects the active component from degradation caused by ambient humidity. Investigations of the structural, optical and electronic properties of the composite indicate that compoundation is purely physical, that is, chemical interactions between the compound partners are avoided and the individual properties of the hybrid glass matrix and the electroactive metallophthalocyanine are retained. Atmosphere-controlled high-temperature electrical impedance measurements reveal significant shifts in resistance in CO<sub>2</sub> and Ar atmosphere as compared to airflow. These results provide a proof of concept for sensitive and selective gas sensors based on such composites.","PeriodicalId":112,"journal":{"name":"Advanced Functional Materials","volume":"74 1","pages":""},"PeriodicalIF":19.0,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987205","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}
Yibo Gao, Miaomiao Zhang, Zutao Fan, Yang Jin, Zhanlong Song, Wenlong Wang, Xiqiang Zhao, Yanpeng Mao
For photocatalytic CO2 reduction, traditional ABO3 perovskite oxides have suffered from the natural surface covered by the passivated AO layer, resulting in low photocatalytic activity. Herein, the double perovskite Sr2TiFeO6 is used as a precursor and citric acid is employed to selectively dissolve the A-site cation, obtaining Srv-Sr2TiFeO6 with abundant A-site vacancies. Without using any co-catalysts or sacrificial agents, the Srv-Sr2TiFeO6 achieves efficient photoreduction of CO2 to CH4 with 91% selectivity and 43.17 µmol g−1 h−1 yield, which is almost five times that of the original Sr2TiFeO6. The results indicate that selectively removing A-site can increase the concentration of oxygen vacancies and significantly reduce the exciton binding energy from 0.61 to 0.32 eV, thereby enhancing the charge transfer efficiency. Furthermore, the A-site vacancies can adjust the surface electronic structure, leading to a decrease of eg electrons occupancy on the active B-site. This results in a shift of the reaction intermediates from strong adsorption to moderate adsorption. Specifically, the energy barrier of the water oxidation reaction, the rate-determining step for the overall CO2 reduction, is greatly reduced. This work provides a vivid case for modulating the electronic structure of perovskite oxide through introducing A-site defects for efficient photoreduction of CO2.
{"title":"Modulating eg Occupancy by A-Site Vacancy to Boost Photocatalytic CO2 Reduction on Perovskite Oxides","authors":"Yibo Gao, Miaomiao Zhang, Zutao Fan, Yang Jin, Zhanlong Song, Wenlong Wang, Xiqiang Zhao, Yanpeng Mao","doi":"10.1002/adfm.202423288","DOIUrl":"https://doi.org/10.1002/adfm.202423288","url":null,"abstract":"For photocatalytic CO<sub>2</sub> reduction, traditional ABO<sub>3</sub> perovskite oxides have suffered from the natural surface covered by the passivated AO layer, resulting in low photocatalytic activity. Herein, the double perovskite Sr<sub>2</sub>TiFeO<sub>6</sub> is used as a precursor and citric acid is employed to selectively dissolve the A-site cation, obtaining Sr<sub>v</sub>-Sr<sub>2</sub>TiFeO<sub>6</sub> with abundant A-site vacancies. Without using any co-catalysts or sacrificial agents, the Sr<sub>v</sub>-Sr<sub>2</sub>TiFeO<sub>6</sub> achieves efficient photoreduction of CO<sub>2</sub> to CH<sub>4</sub> with 91% selectivity and 43.17 µmol g<sup>−1</sup> h<sup>−1</sup> yield, which is almost five times that of the original Sr<sub>2</sub>TiFeO<sub>6</sub>. The results indicate that selectively removing A-site can increase the concentration of oxygen vacancies and significantly reduce the exciton binding energy from 0.61 to 0.32 eV, thereby enhancing the charge transfer efficiency. Furthermore, the A-site vacancies can adjust the surface electronic structure, leading to a decrease of <i>e</i><sub>g</sub> electrons occupancy on the active B-site. This results in a shift of the reaction intermediates from strong adsorption to moderate adsorption. Specifically, the energy barrier of the water oxidation reaction, the rate-determining step for the overall CO<sub>2</sub> reduction, is greatly reduced. This work provides a vivid case for modulating the electronic structure of perovskite oxide through introducing A-site defects for efficient photoreduction of CO<sub>2</sub>.","PeriodicalId":112,"journal":{"name":"Advanced Functional Materials","volume":"13 1","pages":""},"PeriodicalIF":19.0,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987206","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}
Single-atom nanozymes (SANs) are promising enzyme-active catalysts due to their maximum atomic utilization. However, it is still a challenge to precisely regulate the single-atom structure, especially in multimetallic MOFs. Based on the Cu-N4 structure of Zn4Cu1, a cascade competition strategy mediated by a buffer (polydopamine) is proposed for the first time, which induces a one-step nonthermal reaction to precisely remove the inactive Zn site and adjust the Cu coordination environment. Experimental results and theoretical calculations show that the Cu single-atom nanozyme with Cu-N2O2 structure (Cu-N/O) breaks the strong steric restriction, and the exposed Cu active site can better adsorb H2O2, making it have peroxidase-like activity. Compared with traditional bimetallic (Cu4Zn1) and monometallic (Cu-MoF) nanozymes, it has stronger peroxidase-like catalytic activity and photothermal properties, as well as good photocatalytic activity and extremely strong stability. It is successfully applied to Lateral flow immunoassay to achieve three-mode ultrasensitive detection of Escherichia coli O157:H7, and the test strips after detection are subjected to broad-spectrum sterilization treatment.
{"title":"Enhancing Peroxidase-Like Activity and Photothermal Property of Copper Single-Atom Nanozyme via A Cascade Competition Strategy","authors":"Qiushuang Wu, Guoan Zheng, Lihua Li, Li Wang","doi":"10.1002/adfm.202422588","DOIUrl":"https://doi.org/10.1002/adfm.202422588","url":null,"abstract":"Single-atom nanozymes (SANs) are promising enzyme-active catalysts due to their maximum atomic utilization. However, it is still a challenge to precisely regulate the single-atom structure, especially in multimetallic MOFs. Based on the Cu-N<sub>4</sub> structure of Zn<sub>4</sub>Cu<sub>1</sub>, a cascade competition strategy mediated by a buffer (polydopamine) is proposed for the first time, which induces a one-step nonthermal reaction to precisely remove the inactive Zn site and adjust the Cu coordination environment. Experimental results and theoretical calculations show that the Cu single-atom nanozyme with Cu-N<sub>2</sub>O<sub>2</sub> structure (Cu-N/O) breaks the strong steric restriction, and the exposed Cu active site can better adsorb H<sub>2</sub>O<sub>2</sub>, making it have peroxidase-like activity. Compared with traditional bimetallic (Cu<sub>4</sub>Zn<sub>1</sub>) and monometallic (Cu-MoF) nanozymes, it has stronger peroxidase-like catalytic activity and photothermal properties, as well as good photocatalytic activity and extremely strong stability. It is successfully applied to Lateral flow immunoassay to achieve three-mode ultrasensitive detection of <i>Escherichia coli</i> O157:H7, and the test strips after detection are subjected to broad-spectrum sterilization treatment.","PeriodicalId":112,"journal":{"name":"Advanced Functional Materials","volume":"30 1","pages":""},"PeriodicalIF":19.0,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987702","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}
Promoting the sulfur reduction reaction (SRR) and sulfur evolution reaction (SER) kinetics is crucial for practical lithium–sulfur batteries. However, the electrode will be passivated by insulated Li2S if blindly accelerated the SRR kinetics, meanwhile, the high activation energy of Li2S will lead to premature the oxidation of Li2S (SER), achieving limited catalyst. Here, a nano-nickel nitrogen-doped carbon gel material (CG/Ni) induces the instantaneous nucleation, further endows Li2S fast ion/electron transfer, resulting porous 3D growth instead single lateral growth. Therefore, CG/Ni material avoids being passivated, accelerating the SRR kinetics. Meanwhile, CG/Ni decreases the delithiation barrier, thus, facilitating the Li2S dissociation. Both experiments and theory calculation prove that CG/Ni achieves efficient bidirectional catalysis. Consequently, CG/Ni cathode delivers a low-capacity decay ratio of 0.047% per cycle for 900 cycles at 5 C. This work unlocks a bidirectional catalyst and provide new insight for high-efficiency lithium–sulfur batteries.
{"title":"Regulation of Li2S Deposition and Dissolution to Achieve an Efficient Bidirectional Lithium–Sulfur Battery","authors":"Dan You, Wenhao Yang, Yongshun Liang, Chunman Yang, Yiwei Yu, Ziyi Zhu, Xue Li, Yiyong Zhang, Yingjie Zhang","doi":"10.1002/adfm.202421900","DOIUrl":"https://doi.org/10.1002/adfm.202421900","url":null,"abstract":"Promoting the sulfur reduction reaction (SRR) and sulfur evolution reaction (SER) kinetics is crucial for practical lithium–sulfur batteries. However, the electrode will be passivated by insulated Li<sub>2</sub>S if blindly accelerated the SRR kinetics, meanwhile, the high activation energy of Li<sub>2</sub>S will lead to premature the oxidation of Li<sub>2</sub>S (SER), achieving limited catalyst. Here, a nano-nickel nitrogen-doped carbon gel material (CG/Ni) induces the instantaneous nucleation, further endows Li<sub>2</sub>S fast ion/electron transfer, resulting porous 3D growth instead single lateral growth. Therefore, CG/Ni material avoids being passivated, accelerating the SRR kinetics. Meanwhile, CG/Ni decreases the delithiation barrier, thus, facilitating the Li<sub>2</sub>S dissociation. Both experiments and theory calculation prove that CG/Ni achieves efficient bidirectional catalysis. Consequently, CG/Ni cathode delivers a low-capacity decay ratio of 0.047% per cycle for 900 cycles at 5 C. This work unlocks a bidirectional catalyst and provide new insight for high-efficiency lithium–sulfur batteries.","PeriodicalId":112,"journal":{"name":"Advanced Functional Materials","volume":"8 1","pages":""},"PeriodicalIF":19.0,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987703","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}
Jiawei Luo, Ze Lv, Linping Zhang, Yi Zhong, Hong Xu, Zhiping Mao
Multifunctional materials that muster electromagnetic waves absorption (EMA) and thermal conduction features are highly desirable in electronic packaging of advanced electronics. However, traditional carbon-based and ceramic-based materials often rely on semiempirical rules when preparing these bifunctional composites because incompatibility between dielectric behavior and thermal conductivity. Herein, two bifunctional materials (SiC@RGO/EP (SCGE) and Si3N4@RGO/EP (SNGE)) with different dielectric features are obtained by assembling 1D ceramics whiskers and 2D graphene sheets to construct 3D porous skeleton followed by epoxy (EP) encapsulation to understand this underlying relationship. Since semiconductor-type silicon carbide (SiC) ceramics enhance the conductivity and dielectric response of material, thereby significantly intensifying electromagnetic waves loss, the obtained SCGE material harvests remarkable minimal reflection loss values (RLmin) of −85.92 dB at 2.07 mm, which outperform reported SiC-based EMA materials so far. Whereas SNGE material prepared by introducing insulator silicon nitride (Si3N4) ceramics only delivers thermal conductivity (0.86 W m−1 K−1) close to that of SCGE (0.93 W m−1 K−1), but EMA performance is dramatically reduced with RLmin of −19.88 dB at 5 mm. The finding of this work offers new insights for modulating dielectric behavior of ceramic materials and carbon-based materials to achieve the integration of EMA and thermal conduction functions.
{"title":"Modulation of Dielectric Behavior in Ceramic-Based Materials for Integrated Electromagnetic Waves Absorption and Thermal Conduction","authors":"Jiawei Luo, Ze Lv, Linping Zhang, Yi Zhong, Hong Xu, Zhiping Mao","doi":"10.1002/adfm.202420086","DOIUrl":"https://doi.org/10.1002/adfm.202420086","url":null,"abstract":"Multifunctional materials that muster electromagnetic waves absorption (EMA) and thermal conduction features are highly desirable in electronic packaging of advanced electronics. However, traditional carbon-based and ceramic-based materials often rely on semiempirical rules when preparing these bifunctional composites because incompatibility between dielectric behavior and thermal conductivity. Herein, two bifunctional materials (SiC@RGO/EP (SCGE) and Si<sub>3</sub>N<sub>4</sub>@RGO/EP (SNGE)) with different dielectric features are obtained by assembling 1D ceramics whiskers and 2D graphene sheets to construct 3D porous skeleton followed by epoxy (EP) encapsulation to understand this underlying relationship. Since semiconductor-type silicon carbide (SiC) ceramics enhance the conductivity and dielectric response of material, thereby significantly intensifying electromagnetic waves loss, the obtained SCGE material harvests remarkable minimal reflection loss values (RL<sub>min</sub>) of −85.92 dB at 2.07 mm, which outperform reported SiC-based EMA materials so far. Whereas SNGE material prepared by introducing insulator silicon nitride (Si<sub>3</sub>N<sub>4</sub>) ceramics only delivers thermal conductivity (0.86 W m<sup>−1</sup> K<sup>−1</sup>) close to that of SCGE (0.93 W m<sup>−1</sup> K<sup>−1</sup>), but EMA performance is dramatically reduced with RL<sub>min</sub> of −19.88 dB at 5 mm. The finding of this work offers new insights for modulating dielectric behavior of ceramic materials and carbon-based materials to achieve the integration of EMA and thermal conduction functions.","PeriodicalId":112,"journal":{"name":"Advanced Functional Materials","volume":"83 1","pages":""},"PeriodicalIF":19.0,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987197","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}
Jun Zhao, Menglin Li, Xiayun Huang, Xiaoya Zhao, Jie Zhu, Jiahao Wang, Tao Yue, Zhuo Li
Traditional adhesion coupling agents based on small molecules often face challenges such as uneven interface distribution, sensitivity to humidity, and lack of energy dissipation in bulk adhesives, which limit both adhesion performance and long-term reliability. In this work, amphiphilic block copolymer brushes are presented as a new type of coupling agent to overcome these issues. The hydrophilic block forms stable, multi-site interactions with the substrate, while the hydrophobic block penetrates and entangles with the adhesive matrix, facilitating effective energy transmission and dissipation across a broader zone. For instance, before grafting amphiphilic block copolymer brushes, the adhesion strength between copper and polydimethylsiloxane is only 0.5 MPa, but after grafting, the adhesion strength is increased to 8.2 MPa, representing a 16.4-fold improvement, even in the absence of covalent bonding, and surpassing previous enhancement strategies. The adhesion remained strong under various harsh conditions, including thermal aging, thermal cycling, high temperature/high humidity, and even immersion in water. This adaptive approach, which allows for the customization of block compositions, offers great potential for a wide range of applications, including flexible electronics, microfluidics, coatings, and sealing technologies.
{"title":"Diblock Copolymer Brush-Based Adhesion Coupling Agents","authors":"Jun Zhao, Menglin Li, Xiayun Huang, Xiaoya Zhao, Jie Zhu, Jiahao Wang, Tao Yue, Zhuo Li","doi":"10.1002/adfm.202423298","DOIUrl":"https://doi.org/10.1002/adfm.202423298","url":null,"abstract":"Traditional adhesion coupling agents based on small molecules often face challenges such as uneven interface distribution, sensitivity to humidity, and lack of energy dissipation in bulk adhesives, which limit both adhesion performance and long-term reliability. In this work, amphiphilic block copolymer brushes are presented as a new type of coupling agent to overcome these issues. The hydrophilic block forms stable, multi-site interactions with the substrate, while the hydrophobic block penetrates and entangles with the adhesive matrix, facilitating effective energy transmission and dissipation across a broader zone. For instance, before grafting amphiphilic block copolymer brushes, the adhesion strength between copper and polydimethylsiloxane is only 0.5 MPa, but after grafting, the adhesion strength is increased to 8.2 MPa, representing a 16.4-fold improvement, even in the absence of covalent bonding, and surpassing previous enhancement strategies. The adhesion remained strong under various harsh conditions, including thermal aging, thermal cycling, high temperature/high humidity, and even immersion in water. This adaptive approach, which allows for the customization of block compositions, offers great potential for a wide range of applications, including flexible electronics, microfluidics, coatings, and sealing technologies.","PeriodicalId":112,"journal":{"name":"Advanced Functional Materials","volume":"55 1","pages":""},"PeriodicalIF":19.0,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987199","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}
Qixiang Jia, Zhujun Yao, Jiayuan Xiang, Juntao Shi, Yan Zhou, Jianhao Huang, Hongliang Zhang, Xiaoxiao Zhang, Yefeng Yang, Jiangping Tu
Li2ZrCl6 (LZC) solid electrolyte has been recognized as a promising candidate for all-solid-state batteries (ASSBs), owing to its remarkable compatibility with high-voltage cathodes and the cost advantage among halide electrolytes. However, the ionic conductivity of LZC (≈0.4 mS cm−1) requires enhancement. Herein, rare earth metal elements (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb, Y) have been doped into LZC, resulting in a doubling of the ionic conductivity. Moreover, Ta5+ is utilized to further modulate the concentration of Li+ to enhance the ionic conductivity and reduce the dosage of expensive rare-earth metal. Using the Li-Zr-Dy-Cl component as a case study, 16 types of Dy3+ and Ta5+ co-doped electrolytes have been synthesized and the optimal Li2.1Zr0.8Dy0.15Ta0.05Cl6 (LZDTC) exhibits the ionic conductivity of 1.67 mS cm−1. Three-dimensional Li-ion transport pathways in LZDTC has been revealed. The dual-substitution of Dy and Ta at Zr site changes length of Li-Cl bond and Li occupation, thereby reducing the resistance to Li+ migration. ASSBs of Li-In/LGPS-LZDTC/NCM811 demonstrate a capacity of 117 mA h g−1 after 500 cycle at 0.5 C with a 74% retention rate, highlighting the effectiveness of the dual-doping strategy for creating superionic conductors for ASSBs.
{"title":"Rare Earth Metal Ion-Doped Halide Solid Electrolytes plus Ta5+ Substitution for Long Cycling All-Solid-State Batteries","authors":"Qixiang Jia, Zhujun Yao, Jiayuan Xiang, Juntao Shi, Yan Zhou, Jianhao Huang, Hongliang Zhang, Xiaoxiao Zhang, Yefeng Yang, Jiangping Tu","doi":"10.1002/adfm.202426053","DOIUrl":"https://doi.org/10.1002/adfm.202426053","url":null,"abstract":"Li<sub>2</sub>ZrCl<sub>6</sub> (LZC) solid electrolyte has been recognized as a promising candidate for all-solid-state batteries (ASSBs), owing to its remarkable compatibility with high-voltage cathodes and the cost advantage among halide electrolytes. However, the ionic conductivity of LZC (≈0.4 mS cm<sup>−1</sup>) requires enhancement. Herein, rare earth metal elements (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb, Y) have been doped into LZC, resulting in a doubling of the ionic conductivity. Moreover, Ta<sup>5+</sup> is utilized to further modulate the concentration of Li<sup>+</sup> to enhance the ionic conductivity and reduce the dosage of expensive rare-earth metal. Using the Li-Zr-Dy-Cl component as a case study, 16 types of Dy<sup>3+</sup> and Ta<sup>5+</sup> co-doped electrolytes have been synthesized and the optimal Li<sub>2.1</sub>Zr<sub>0.8</sub>Dy<sub>0.15</sub>Ta<sub>0.05</sub>Cl<sub>6</sub> (LZDTC) exhibits the ionic conductivity of 1.67 mS cm<sup>−1</sup>. Three-dimensional Li-ion transport pathways in LZDTC has been revealed. The dual-substitution of Dy and Ta at Zr site changes length of Li-Cl bond and Li occupation, thereby reducing the resistance to Li<sup>+</sup> migration. ASSBs of Li-In/LGPS-LZDTC/NCM811 demonstrate a capacity of 117 mA h g<sup>−1</sup> after 500 cycle at 0.5 C with a 74% retention rate, highlighting the effectiveness of the dual-doping strategy for creating superionic conductors for ASSBs.","PeriodicalId":112,"journal":{"name":"Advanced Functional Materials","volume":"20 1","pages":""},"PeriodicalIF":19.0,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987203","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}