Silpa S, Nidha Mariyam, Kritika Sharu, Saptak Majumder, Joy Mitra, Vinayak B. Kamble
Hydrogen is emerging as a promising fuel source for a sustainable, carbon-free future. However, its explosive nature necessitates robust safety measures, including optical hydrogen sensors, which are ideal for detecting minor leaks in hazardous environments due to their non-contact operation. In this study, we investigate two photonic crystal structures using novel transition metal oxide CuCo2O4 (CCO), CCO Opal, and inverse opal for sensing hydrogen through dynamic reflectance measurements. The CCO opal shows a detection ranging from 25%-1% by the decrease in the intensity of the photonic band gap with a shift of 5 nm with a response time of 20 minutes, while CCO inverse Opal detects 1%-0.3% of hydrogen with a 12 nm shift within 2 minutes with a change in the effective refractive index of 0.0159. Further, in-situ Raman spectroscopic studies reveal that the change in the vibrational modes of CCO on exposure to hydrogen results in the formation of an intermediate compound structurally analogous to CoO, causing a change in the effective refractive index. The metal ion coordination shows distinct changes favoring a tetrahedral environment for reduced metal ions. The ratio of the intensity of A1g mode and F2g mode shows a decrement with time while exposing to 5%-0.5% of hydrogen with a response time of 3 minutes, which coincides with the optical sensing response. Thus, the optical gas sensors are fabricated using scalable and facile techniques for the detection of hydrogen without any noble metal catalyst and demonstrating room temperature application for safety and process control.
{"title":"Novel CuCo₂O₄ Photonic Crystals for Optical Hydrogen Sensing: Catalyst-Free Detection and Mechanistic insights via in-situ Raman Spectroscopy","authors":"Silpa S, Nidha Mariyam, Kritika Sharu, Saptak Majumder, Joy Mitra, Vinayak B. Kamble","doi":"10.1039/d4ta08963d","DOIUrl":"https://doi.org/10.1039/d4ta08963d","url":null,"abstract":"Hydrogen is emerging as a promising fuel source for a sustainable, carbon-free future. However, its explosive nature necessitates robust safety measures, including optical hydrogen sensors, which are ideal for detecting minor leaks in hazardous environments due to their non-contact operation. In this study, we investigate two photonic crystal structures using novel transition metal oxide CuCo2O4 (CCO), CCO Opal, and inverse opal for sensing hydrogen through dynamic reflectance measurements. The CCO opal shows a detection ranging from 25%-1% by the decrease in the intensity of the photonic band gap with a shift of 5 nm with a response time of 20 minutes, while CCO inverse Opal detects 1%-0.3% of hydrogen with a 12 nm shift within 2 minutes with a change in the effective refractive index of 0.0159. Further, in-situ Raman spectroscopic studies reveal that the change in the vibrational modes of CCO on exposure to hydrogen results in the formation of an intermediate compound structurally analogous to CoO, causing a change in the effective refractive index. The metal ion coordination shows distinct changes favoring a tetrahedral environment for reduced metal ions. The ratio of the intensity of A1g mode and F2g mode shows a decrement with time while exposing to 5%-0.5% of hydrogen with a response time of 3 minutes, which coincides with the optical sensing response. Thus, the optical gas sensors are fabricated using scalable and facile techniques for the detection of hydrogen without any noble metal catalyst and demonstrating room temperature application for safety and process control.","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":"20 1","pages":""},"PeriodicalIF":11.9,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143797725","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}
Sikandar Iqbal, Aadil Nabi Chishti, Javed Rehman, Fakhr ur Zaman, Ting Luo, Moazzam Ali, Muhammad Ali, Samia Aman, Hamid Hussain, Huiqin Huang, Shakeel Ahmad Khandy, Yinzhu Jiang, Muhammad Yousaf
Introducing highly sodiophilic skeletons is a highly efficient approach to mitigating the challenges of sodium metal anode (SMA). However, the limited functionality of skeletons and poor processability of bare sodium metal further obstruct the practical application of SMA. Herein, a stable SMA with high processability is realized by introducing a percolated multi-functional NPC/Na2Se framework throughout metallic Na using simple heating infusion and rolling/folding processes. This percolated framework provides mechanical strength to mitigate cracking and facilitates interconnected pathways for the rapid and even distribution of charges, reducing hotspots and promoting homogenous Na deposition. Moreover, the Na2Se in the NPC/Na2Se framework produces a stable solid electrolyte interphase (SEI) for fast Na+ diffusion. At the same time, the NPC acts as a 3D matrix to confine the Na and buffer the huge volume change. Consequently, the modified Na@NPC/Na2Se anode demonstrates excellent performance in both low-cost carbonate (1200 h at 1.0 mA cm-2) and ether-based (8000 h at 5.0 mA cm-2) electrolytes with high Coulombic efficiency (99.89% for 200 h of plating/striping). More remarkably, the Na@NPC/Na2Se||NVP full cell manifests unprecedented cycling (85 m Ah g-1 at 20C after 4000 cycles) and excellent rate capability (~105 m Ah g-1 at 50C). This electrode featuring a multi-functional framework creates new opportunities for the development of SMA and can be extended to anode free batteries.
{"title":"Introduction of a Multifunctional Percolated Framework into Na Metal for Highly Stable Sodium Metal Batteries","authors":"Sikandar Iqbal, Aadil Nabi Chishti, Javed Rehman, Fakhr ur Zaman, Ting Luo, Moazzam Ali, Muhammad Ali, Samia Aman, Hamid Hussain, Huiqin Huang, Shakeel Ahmad Khandy, Yinzhu Jiang, Muhammad Yousaf","doi":"10.1039/d4ta09090j","DOIUrl":"https://doi.org/10.1039/d4ta09090j","url":null,"abstract":"Introducing highly sodiophilic skeletons is a highly efficient approach to mitigating the challenges of sodium metal anode (SMA). However, the limited functionality of skeletons and poor processability of bare sodium metal further obstruct the practical application of SMA. Herein, a stable SMA with high processability is realized by introducing a percolated multi-functional NPC/Na2Se framework throughout metallic Na using simple heating infusion and rolling/folding processes. This percolated framework provides mechanical strength to mitigate cracking and facilitates interconnected pathways for the rapid and even distribution of charges, reducing hotspots and promoting homogenous Na deposition. Moreover, the Na2Se in the NPC/Na2Se framework produces a stable solid electrolyte interphase (SEI) for fast Na+ diffusion. At the same time, the NPC acts as a 3D matrix to confine the Na and buffer the huge volume change. Consequently, the modified Na@NPC/Na2Se anode demonstrates excellent performance in both low-cost carbonate (1200 h at 1.0 mA cm-2) and ether-based (8000 h at 5.0 mA cm-2) electrolytes with high Coulombic efficiency (99.89% for 200 h of plating/striping). More remarkably, the Na@NPC/Na2Se||NVP full cell manifests unprecedented cycling (85 m Ah g-1 at 20C after 4000 cycles) and excellent rate capability (~105 m Ah g-1 at 50C). This electrode featuring a multi-functional framework creates new opportunities for the development of SMA and can be extended to anode free batteries.","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":"90 1","pages":""},"PeriodicalIF":11.9,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143797935","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}
Sodium-ion batteries (SIBs) have emerged as a compelling alternative to lithium-ion batteries, driven by the abundance of raw materials and lower costs. Iron-based polyanionic compounds, particularly Na2+xFe1+x(PO4)xP2O7 (NFPP), stand out as promising cathode materials due to their structural stability, high operating voltage, and superior cycling performance. This review offers a comprehensive overview of recent advances in NFPP cathodes, addressing their crystal structure, electrochemical mechanisms, synthesis techniques, and performance-enhancing modifications. Key challenges—including low electronic conductivity, impurity phase formation, and constrained energy density—are critically examined. To mitigate these issues, strategic approaches such as phase optimization, carbon coating, doping, and heterostructure design are systematically evaluated for their efficacy in improving conductivity, stability, and energy output. Furthermore, the barriers to scaling NFPP production, such as synthesis scalability and cost-efficient processing, are discussed in the context of commercialization. Finally, future research priorities are proposed, emphasizing advanced nanostructure, novel doping elements, and sustainable synthesis routes to accelerate the development of high-performance NFPP cathodes. These efforts aim to pave the way for practical, economically viable, and environmentally sustainable SIB technologies.
{"title":"Iron-Based Polyanionic Cathodes for Sustainable Sodium-Ion Batteries","authors":"Long Li, Jiaqi Meng, Xiangpeng Kong, Peiling Lin, Qiang Rong, Xingxing Jiao, Zhongxiao Song, Yangyang Liu, Shujiang Ding","doi":"10.1039/d5ta01112d","DOIUrl":"https://doi.org/10.1039/d5ta01112d","url":null,"abstract":"Sodium-ion batteries (SIBs) have emerged as a compelling alternative to lithium-ion batteries, driven by the abundance of raw materials and lower costs. Iron-based polyanionic compounds, particularly Na2+xFe1+x(PO4)xP2O7 (NFPP), stand out as promising cathode materials due to their structural stability, high operating voltage, and superior cycling performance. This review offers a comprehensive overview of recent advances in NFPP cathodes, addressing their crystal structure, electrochemical mechanisms, synthesis techniques, and performance-enhancing modifications. Key challenges—including low electronic conductivity, impurity phase formation, and constrained energy density—are critically examined. To mitigate these issues, strategic approaches such as phase optimization, carbon coating, doping, and heterostructure design are systematically evaluated for their efficacy in improving conductivity, stability, and energy output. Furthermore, the barriers to scaling NFPP production, such as synthesis scalability and cost-efficient processing, are discussed in the context of commercialization. Finally, future research priorities are proposed, emphasizing advanced nanostructure, novel doping elements, and sustainable synthesis routes to accelerate the development of high-performance NFPP cathodes. These efforts aim to pave the way for practical, economically viable, and environmentally sustainable SIB technologies.","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":"20 1","pages":""},"PeriodicalIF":11.9,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143797898","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}
Heptazine-based conjugated microporous polymers (CMPs) constructed by s-heptazine and designable linker are considered promising materials for photocatalytic hydrogen evolution (PHE). However, there is a lack of systematic research concerning the influence of linker regulation on structure-property-performance relationship of heptazine-based CMPs, the detailed mechanism of which remains largely elusive and is usually ignored. Herein, we proposed the electron-donor engineering strategy that electron donors TAPB and TAPPy are introduced at different feed ratios to construct a series of novel heptazine-based donor-acceptor CMPs (Y1-Y4). The substantial experimental and theoretical evidences support that linker replacement of TAPB with stronger electron donor TAPPy can facilitate the formation of more powerful local built-in electric fields, which thereby significantly reduces exciton binding energy, accelerates charge separation and enhances PHE performance. At the optimized condition, the hydrogen evolution rate of Y4 is up to 27 mmol g-1 h-1, which is 57 and 1928 times than that of Y1 and g-C3N4, respectively. Without cocatalyst, the AQY of Y4 can reach to 8.5% at 420 nm, superior to most catalysts currently reported. This work uncovers the key role of electron-donating linker and provides new ideas for the design of high-performance heptazine-based CMPs.
{"title":"Electron-Donor Engineering of Heptazine-Based Donor-Acceptor Conjugated Microporous Polymers for Efficient Metal-Free Photocatalytic Hydrogen Evolution","authors":"Lin-Fang Yang, Yi-Zhou Zhu, Cheng-Cheng Zhang, Jian-Yu Zheng","doi":"10.1039/d5ta01288k","DOIUrl":"https://doi.org/10.1039/d5ta01288k","url":null,"abstract":"Heptazine-based conjugated microporous polymers (CMPs) constructed by s-heptazine and designable linker are considered promising materials for photocatalytic hydrogen evolution (PHE). However, there is a lack of systematic research concerning the influence of linker regulation on structure-property-performance relationship of heptazine-based CMPs, the detailed mechanism of which remains largely elusive and is usually ignored. Herein, we proposed the electron-donor engineering strategy that electron donors TAPB and TAPPy are introduced at different feed ratios to construct a series of novel heptazine-based donor-acceptor CMPs (<strong>Y1</strong>-<strong>Y4</strong>). The substantial experimental and theoretical evidences support that linker replacement of TAPB with stronger electron donor TAPPy can facilitate the formation of more powerful local built-in electric fields, which thereby significantly reduces exciton binding energy, accelerates charge separation and enhances PHE performance. At the optimized condition, the hydrogen evolution rate of <strong>Y4</strong> is up to 27 mmol g<small><sup>-1</sup></small> h<small><sup>-1</sup></small>, which is 57 and 1928 times than that of <strong>Y1</strong> and g-C<small><sub>3</sub></small>N<small><sub>4</sub></small>, respectively. Without cocatalyst, the AQY of <strong>Y4</strong> can reach to 8.5% at 420 nm, superior to most catalysts currently reported. This work uncovers the key role of electron-donating linker and provides new ideas for the design of high-performance heptazine-based CMPs.","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":"32 1","pages":""},"PeriodicalIF":11.9,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143797937","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}
Irshad Ahmad, Zaheer Ud Din Babar, Yifei Zhang, Ayman Al-Qattan, Samia Ben Ahmed, Gao Li
Covalent organic frameworks (COFs) are highly porous and crystalline organic polymers with remarkable thermal and chemical stability. Their tunable structures and properties have enabled their application in diverse fields. However, COFs suffer from significant drawbacks, including poor processability, strong self-stacking tendencies, limited electrical conductivity, restricted ion transport due to pore blockage, and rapid recombination of photogenerated charge carriers. To address these limitations, the construction of heterojunctions between COFs and other semiconductors has emerged as an effective approach. In particular, the S-scheme heterojunction design has recently attracted increasing attention due to its ability to suppress charge carrier recombination while preserving strong redox capability, thereby enhancing photocatalytic efficiency. Despite these advantages, there remains a scarcity of comprehensive reviews focusing on COFs-based S-scheme heterojunctions. This review provides a detailed overview of their structural characteristics and functional properties in photocatalysis. It further discusses various synthesis strategies and charge transfer mechanisms involved in constructing S-scheme heterojunctions by integrating COFs with different semiconductor materials. Additionally, the recent advancements in COFs-based S-scheme heterojunction photocatalysts are summarized, highlighting their various applications. Finally, the persisting challenges and potential future research directions in this field are critically examined.
{"title":"Unlocking sunlight driven photocatalysis: synthesis, diversity, and applications of COF-based S-scheme heterojunctions","authors":"Irshad Ahmad, Zaheer Ud Din Babar, Yifei Zhang, Ayman Al-Qattan, Samia Ben Ahmed, Gao Li","doi":"10.1039/d5ta01232e","DOIUrl":"https://doi.org/10.1039/d5ta01232e","url":null,"abstract":"Covalent organic frameworks (COFs) are highly porous and crystalline organic polymers with remarkable thermal and chemical stability. Their tunable structures and properties have enabled their application in diverse fields. However, COFs suffer from significant drawbacks, including poor processability, strong self-stacking tendencies, limited electrical conductivity, restricted ion transport due to pore blockage, and rapid recombination of photogenerated charge carriers. To address these limitations, the construction of heterojunctions between COFs and other semiconductors has emerged as an effective approach. In particular, the S-scheme heterojunction design has recently attracted increasing attention due to its ability to suppress charge carrier recombination while preserving strong redox capability, thereby enhancing photocatalytic efficiency. Despite these advantages, there remains a scarcity of comprehensive reviews focusing on COFs-based S-scheme heterojunctions. This review provides a detailed overview of their structural characteristics and functional properties in photocatalysis. It further discusses various synthesis strategies and charge transfer mechanisms involved in constructing S-scheme heterojunctions by integrating COFs with different semiconductor materials. Additionally, the recent advancements in COFs-based S-scheme heterojunction photocatalysts are summarized, highlighting their various applications. Finally, the persisting challenges and potential future research directions in this field are critically examined.","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":"13 1","pages":""},"PeriodicalIF":11.9,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143797890","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}
Marek K. Węcławski, Marie Jakešová, Martyna Charyton, Nicola Demitri, Beata Koszarna, Kerstin Oppelt, Serdar Sariciftci, Daniel T. Gryko, Eric Daniel Głowacki
Correction for ‘Biscoumarin-containing acenes as stable organic semiconductors for photocatalytic oxygen reduction to hydrogen peroxide’ by Marek K. Węcławski et al., J. Mater. Chem. A, 2017, 5, 20780–20788, https://doi.org/10.1039/C7TA05882A.
{"title":"Correction: Biscoumarin-containing acenes as stable organic semiconductors for photocatalytic oxygen reduction to hydrogen peroxide","authors":"Marek K. Węcławski, Marie Jakešová, Martyna Charyton, Nicola Demitri, Beata Koszarna, Kerstin Oppelt, Serdar Sariciftci, Daniel T. Gryko, Eric Daniel Głowacki","doi":"10.1039/d5ta90079d","DOIUrl":"https://doi.org/10.1039/d5ta90079d","url":null,"abstract":"Correction for ‘Biscoumarin-containing acenes as stable organic semiconductors for photocatalytic oxygen reduction to hydrogen peroxide’ by Marek K. Węcławski <em>et al.</em>, <em>J. Mater. Chem. A</em>, 2017, <strong>5</strong>, 20780–20788, https://doi.org/10.1039/C7TA05882A.","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":"33 1","pages":""},"PeriodicalIF":11.9,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143797771","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}
Zinc–air batteries (ZABs) are a potential category of energy storage devices that are typically driven by strong and effective catalysts at the oxygen-based cathode. Hence, highly active and robust non-noble metal-based electrocatalysts with binary active sites for stabilizing the various oxygen-based species formed during the battery cycling are major requisites for the global application of zinc–air batteries. Co–N–C is a promising alternative to noble metal-based oxygen electrocatalysts. Herein, we report an ionic liquid-driven synthesis of a Co–N–C based catalyst via self-doping of ternary heteroatoms (B, N, and F) using a simple one-pot pyrolysis method. The heteroatoms further synergized the performance of the Co–N–C, and the best-optimized catalyst, namely, CoILPh 700, was capable of delivering a positive ORR onset potential of 0.956 V with a limiting current density of 5.6 mA cm−2 and an OER overpotential of 380 mV with enhanced stability, outperforming their corresponding benchmarks. A prototype zinc–air battery fabricated based on the CoILPh 700 electrocatalyst achieved a maximum peak power density and specific capacity of 228 mW cm−2 and 815 mA h g−1, respectively, with a cycling stability of more than 300 h at 5 mA cm−2. The novelty of this work is that an interesting study was performed, wherein the battery was cycled at different increasing depths of charge–discharge time intervals to evaluate its real-time performance. Notably, the device was able to completely recharge even after 72 h of discharge, which was quite impressive. This study offers an approach to improve the endurance of advanced zinc–air batteries at higher depths of discharge via the sensible design of non-noble metal catalysts.
{"title":"Ionic-liquid-engineered, interfacial π–π-anchored, cobalt-dispersed, and N-, F-, B-doped carbon matrix as an oxygen electrocatalyst for advanced zinc–air batteries","authors":"Nadar Allwyn, Mukkattu Kuniyil Nikhil Chandran, Venkatraman Maithreyan, Maria Antony Shalom, Marappan Sathish","doi":"10.1039/d5ta00770d","DOIUrl":"https://doi.org/10.1039/d5ta00770d","url":null,"abstract":"Zinc–air batteries (ZABs) are a potential category of energy storage devices that are typically driven by strong and effective catalysts at the oxygen-based cathode. Hence, highly active and robust non-noble metal-based electrocatalysts with binary active sites for stabilizing the various oxygen-based species formed during the battery cycling are major requisites for the global application of zinc–air batteries. Co–N–C is a promising alternative to noble metal-based oxygen electrocatalysts. Herein, we report an ionic liquid-driven synthesis of a Co–N–C based catalyst <em>via</em> self-doping of ternary heteroatoms (B, N, and F) using a simple one-pot pyrolysis method. The heteroatoms further synergized the performance of the Co–N–C, and the best-optimized catalyst, namely, CoILPh 700, was capable of delivering a positive ORR onset potential of 0.956 V with a limiting current density of 5.6 mA cm<small><sup>−2</sup></small> and an OER overpotential of 380 mV with enhanced stability, outperforming their corresponding benchmarks. A prototype zinc–air battery fabricated based on the CoILPh 700 electrocatalyst achieved a maximum peak power density and specific capacity of 228 mW cm<small><sup>−2</sup></small> and 815 mA h g<small><sup>−1</sup></small>, respectively, with a cycling stability of more than 300 h at 5 mA cm<small><sup>−2</sup></small>. The novelty of this work is that an interesting study was performed, wherein the battery was cycled at different increasing depths of charge–discharge time intervals to evaluate its real-time performance. Notably, the device was able to completely recharge even after 72 h of discharge, which was quite impressive. This study offers an approach to improve the endurance of advanced zinc–air batteries at higher depths of discharge <em>via</em> the sensible design of non-noble metal catalysts.","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":"18 1","pages":""},"PeriodicalIF":11.9,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143797894","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}
To solve the deterioration of water resource environment, on-site water production technologies have garnered attention. Here, we demonstrate the example of pressure-induced water production using a copper–chromium Prussian blue analog (CuCr PBA). Applying pressure caused water droplets to generate from the CuCr PBA. Collecting the water droplets with a pipette revealed that approximately 240 g of water was obtained per 1 kg of CuCr PBA. One possible mechanism of the water production could be the hydrophobization of pores at defect sites based on partial electron transfer from the oxygen of ligand water to copper upon pressure application. This article presents a new approach to water production, which is an important step towards the further development of the water environmental improvement technology.
{"title":"Pressure-induced water producing using a copper–chromium Prussian blue analog","authors":"Shintaro Akagi, Mayuko Tanaka, Junhao Wang, Hisao Kiuchi, Yoshihisa Harada, Yizhou Chen, Kazuhiro Marumoto, Kenta Imoto, Shin-ichi Ohkoshi, Hiroko Tokoro","doi":"10.1039/d4ta08305a","DOIUrl":"https://doi.org/10.1039/d4ta08305a","url":null,"abstract":"To solve the deterioration of water resource environment, on-site water production technologies have garnered attention. Here, we demonstrate the example of pressure-induced water production using a copper–chromium Prussian blue analog (CuCr PBA). Applying pressure caused water droplets to generate from the CuCr PBA. Collecting the water droplets with a pipette revealed that approximately 240 g of water was obtained per 1 kg of CuCr PBA. One possible mechanism of the water production could be the hydrophobization of pores at defect sites based on partial electron transfer from the oxygen of ligand water to copper upon pressure application. This article presents a new approach to water production, which is an important step towards the further development of the water environmental improvement technology.","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":"35 1","pages":""},"PeriodicalIF":11.9,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143797933","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}
Single-crystal cobalt-free, nickel-rich layered oxides have garnered considerable attention as cathode materials for lithium-ion batteries (LIBs), primarily due to their impressive reversible specific capacity and low cost-effectiveness. However, a notable drawback of cobalt-free materials is their susceptibility to rapid structural degradation during cycling. In this study, we introduce a Mg/Nb/Al co-doped and surface-coated single-crystal LiNi0.9Mn0.1O2 (SHE-SC-LNM) cathode material that demonstrates significantly enhanced cycling stability. The formation of a high-entropy layer near the surface enhances the reversibility of lattice oxygen, effectively inhibiting oxygen evolution and release, alleviating the formation of oxygen vacancies, and stabilizing transition metal ions. During both delithiation and lithiation processes, this layer enhances the reversibility of the H2–H3 phase transition, reduces lattice-plane slippage, minimizes the accumulation and release of anisotropic lattice strain, and facilitates Li+ diffusion kinetics. Additionally, an Al2O3/LiAlO2 interfacial layer forms on the surface, giving rise to a thin and stable cathode–electrolyte interphase (CEI) that effectively mitigates HF attack and curbs the dissolution of metal ions. Thanks to its fast charge/discharge capability and high-voltage stability, the SHE-SC-LNM cathode exhibits an initial discharge capacity of 213.61 mAh g-1 at 0.1 C. Furthermore, it retains an impressive 90.1% of its capacity after 300 cycles at 1.0 C. These findings underscore the potential of Mg/Nb/Al co-doped and coated single-crystal LiNi0.9Mn0.1O2 as a high-performance, cobalt-free cathode material for the next-generation lithium-ion batteries.
{"title":"Ultra-high nickel cobalt-free cathode material toward high-energy and long-cycle stable Li-ion batteries: a single-crystal and surface high-entropy design strategy","authors":"Jianyao Ma, Xin Huang, Ruijian Huang, Yang Tang, Shengyi Huang, Yuhang Wang, Bin Huang, Jianwen Yang, Yanwei Li, Meng Qin, Shunhua Xiao","doi":"10.1039/d5ta01897h","DOIUrl":"https://doi.org/10.1039/d5ta01897h","url":null,"abstract":"Single-crystal cobalt-free, nickel-rich layered oxides have garnered considerable attention as cathode materials for lithium-ion batteries (LIBs), primarily due to their impressive reversible specific capacity and low cost-effectiveness. However, a notable drawback of cobalt-free materials is their susceptibility to rapid structural degradation during cycling. In this study, we introduce a Mg/Nb/Al co-doped and surface-coated single-crystal LiNi0.9Mn0.1O2 (SHE-SC-LNM) cathode material that demonstrates significantly enhanced cycling stability. The formation of a high-entropy layer near the surface enhances the reversibility of lattice oxygen, effectively inhibiting oxygen evolution and release, alleviating the formation of oxygen vacancies, and stabilizing transition metal ions. During both delithiation and lithiation processes, this layer enhances the reversibility of the H2–H3 phase transition, reduces lattice-plane slippage, minimizes the accumulation and release of anisotropic lattice strain, and facilitates Li+ diffusion kinetics. Additionally, an Al2O3/LiAlO2 interfacial layer forms on the surface, giving rise to a thin and stable cathode–electrolyte interphase (CEI) that effectively mitigates HF attack and curbs the dissolution of metal ions. Thanks to its fast charge/discharge capability and high-voltage stability, the SHE-SC-LNM cathode exhibits an initial discharge capacity of 213.61 mAh g-1 at 0.1 C. Furthermore, it retains an impressive 90.1% of its capacity after 300 cycles at 1.0 C. These findings underscore the potential of Mg/Nb/Al co-doped and coated single-crystal LiNi0.9Mn0.1O2 as a high-performance, cobalt-free cathode material for the next-generation lithium-ion batteries.","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":"37 1","pages":""},"PeriodicalIF":11.9,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143797896","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}
Peng Sang, Ningning Liang, Yi Liu, Lei Gu, Zan Zhang, Yongsheng Li
Microstructure design is effective in achieving strength-ductility synergy in high/medium entropy alloys. A new type of non-equiatomic FeCrNiAl0.3V0.1Ti0.2 medium entropy alloy (Al3V1Ti2 MEA) was designed and prepared in as-cast, the unique microstructures are consist of high-density hierarchical L21 nanoparticles and serrated grain boundaries. By using Ti to replace part of V in Al3V3 (FeCrNiAl0.3V0.3) alloy, the Al3V1Ti2 alloy obtained two additional L21 phases in near-spherical nano and lamellar shape in addition to the near-spherical sub-micron L21 phase in Al3V3 alloy. The triple hierarchical precipitation (THP) and serrated grain boundaries in Al3V1Ti2 MEA contribute the super-strength and plastic properties, the compressive yield strength reaches 1.15 GPa, the maximum strength is 3.04 GPa, and the elongation is maintained at 24%. The mechanical properties are superior to most of the FeCrAlNiCo and FeCrNiAl-based HEAs. These results indicate that the Co-free low-cost high/medium entropy alloys with THP are promising new system for engineering applications.
{"title":"Triple hierarchical precipitation and serrated grain boundaries strengthened Co-free medium-entropy alloys","authors":"Peng Sang, Ningning Liang, Yi Liu, Lei Gu, Zan Zhang, Yongsheng Li","doi":"10.1039/d5ta01907a","DOIUrl":"https://doi.org/10.1039/d5ta01907a","url":null,"abstract":"Microstructure design is effective in achieving strength-ductility synergy in high/medium entropy alloys. A new type of non-equiatomic FeCrNiAl<small><sub>0.3</sub></small>V<small><sub>0.1</sub></small>Ti0.2 medium entropy alloy (Al3V1Ti2 MEA) was designed and prepared in as-cast, the unique microstructures are consist of high-density hierarchical L21 nanoparticles and serrated grain boundaries. By using Ti to replace part of V in Al3V3 (FeCrNiAl0.3V0.3) alloy, the Al3V1Ti2 alloy obtained two additional L21 phases in near-spherical nano and lamellar shape in addition to the near-spherical sub-micron L21 phase in Al3V3 alloy. The triple hierarchical precipitation (THP) and serrated grain boundaries in Al3V1Ti2 MEA contribute the super-strength and plastic properties, the compressive yield strength reaches 1.15 GPa, the maximum strength is 3.04 GPa, and the elongation is maintained at 24%. The mechanical properties are superior to most of the FeCrAlNiCo and FeCrNiAl-based HEAs. These results indicate that the Co-free low-cost high/medium entropy alloys with THP are promising new system for engineering applications.","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":"10 1","pages":""},"PeriodicalIF":11.9,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143797938","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}
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