Journal of Materials Chemistry A最新文献

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Hierarchical hard-phase-induced phase-separation toward high-strength, tough, and impact-resistant supramolecular polymers 层次硬相诱导相分离向高强度,韧性和抗冲击的超分子聚合物
IF 11.9 2区 材料科学
Journal of Materials Chemistry A Pub Date : 2026-10-14 DOI: 10.1039/d6ta03084j
Hui-Kang Xu,Shui-Juan Peng,Zhuo-Yang Li,Zi-Han Deng,Ze Zong,Feng Zhang,Yue-Yi Wang,Rui-Yu Ma,Ding-Xiang Yan,Zhong-Ming Li
{"title":"Hierarchical hard-phase-induced phase-separation toward high-strength, tough, and impact-resistant supramolecular polymers","authors":"Hui-Kang Xu,Shui-Juan Peng,Zhuo-Yang Li,Zi-Han Deng,Ze Zong,Feng Zhang,Yue-Yi Wang,Rui-Yu Ma,Ding-Xiang Yan,Zhong-Ming Li","doi":"10.1039/d6ta03084j","DOIUrl":"https://doi.org/10.1039/d6ta03084j","url":null,"abstract":"High-performance and self-healing polymeric materials are indispensable for flexible electronics. Advanced polymers are now expected to integrate high strength, large extensibility, excellent toughness, intrinsic self-healing, and recyclability within a single molecular framework. Here, we report a hierarchical hard-phase-induced phase-separation strategy to construct a supramolecular polymer composed of polyimide (PI) and polyurea (PUU), denoted as PIU. The synergistic aggregation of rigid segments drives the formation of hierarchical hard-phases with overlapping size distributions. Their coexistence establishes a continuous load-transfer network that effectively suppresses local stress concentration. Consequently, PIU achieves a tensile strength of 71 MPa, elongation at break of 822%, and toughness of 458 MJ m−3. The dynamic H-bond network endows the material with intrinsic self-healing capabilities. Interfacial interactions enable Carbon Fiber (CF)/PIU composites to achieve superior adhesion and structural integrity. The polymer demonstrates exceptional impact resistance, shielding fragile electronics from drop-weight impacts. These findings demonstrate this strategy offers a scalable design framework for constructing next-generation high-performance materials.","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":"33 1","pages":""},"PeriodicalIF":11.9,"publicationDate":"2026-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149173190","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
Ligand-engineered coordination microenvironments in metallized covalent organic frameworks for efficient photocatalytic CO reduction 金属化共价有机框架中配体工程配位微环境的高效光催化CO还原
IF 11.9 2区 材料科学
Journal of Materials Chemistry A Pub Date : 2026-10-14 DOI: 10.1039/d6ta03971e
Wenjing Liu,Daotong Wei,Xinyi Wu,Nianzu Shu,Chenli Wang,Jundong Lyu,Xiaochun Ke,Chuan-Lei Zhang
{"title":"Ligand-engineered coordination microenvironments in metallized covalent organic frameworks for efficient photocatalytic CO reduction","authors":"Wenjing Liu,Daotong Wei,Xinyi Wu,Nianzu Shu,Chenli Wang,Jundong Lyu,Xiaochun Ke,Chuan-Lei Zhang","doi":"10.1039/d6ta03971e","DOIUrl":"https://doi.org/10.1039/d6ta03971e","url":null,"abstract":"The catalytic conversion of CO2 into value-added chemicals represents a promising strategy for mitigating atmospheric CO2 levels, yet the development of efficient and selective photocatalysts remains a formidable challenge. Metalated covalent organic frameworks (M-COFs) offer a tunable platform for CO2 photoreduction, but precisely controlling the local coordination microenvironment around active sites to modulate electronic structure and charge-carrier dynamics has proven difficult. Herein, a series of imine-linked COFs bearing different substituents (–H, –CH3, –C(CH3)3), denoted as HCOF, DCOF, and TCOF, were first synthesized under ambient conditions, followed by the post-synthetic coordination anchoring of nickel (Ni) metal centers to construct the corresponding catalysts with atomically dispersed Ni sites (Ni@HCOF, Ni@DCOF, Ni@TCOF). Photocatalytic CO2 reduction tests revealed that Ni@TCOF achieved the highest catalytic activity with a CO production rate of 12 004.37 µmol g−1 h−1 and nearly 100% selectivity, substantially outperforming Ni@DCOF (4958.52 µmol g−1 h−1) and Ni@HCOF (2338.6 µmol g−1 h−1). Comprehensive characterization and mechanistic studies demonstrated that the superior performance originates from the strong electron-donating ability of the tert-butyl substituents, which optimize the local coordination microenvironment around the Ni active sites and promote the separation and transport of photogenerated charge carriers. This work provides profound insights into regulating the local coordination environment of M-COFs through ligand engineering for the development of highly active and selective CO2 reduction catalysts.","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":"408 1","pages":""},"PeriodicalIF":11.9,"publicationDate":"2026-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149173191","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
Complete Encapsulation of Sulfur-Bridged Carbonyl Molecules in Graphene Oxide Matrix Enables Ultrastable Organic Cathodes for Lithium-Ion Batteries 硫桥羰基分子在氧化石墨烯基体中的完全封装使锂离子电池的超稳定有机阴极成为可能
IF 11.9 2区 材料科学
Journal of Materials Chemistry A Pub Date : 2026-10-14 DOI: 10.1039/d6ta05610e
Hai Liu,Song Chen,Xing Wu,Zehao Yu,Hongli Deng,Yizhi Yuan,Zhiqiang Zhu,Jian Zhu
{"title":"Complete Encapsulation of Sulfur-Bridged Carbonyl Molecules in Graphene Oxide Matrix Enables Ultrastable Organic Cathodes for Lithium-Ion Batteries","authors":"Hai Liu,Song Chen,Xing Wu,Zehao Yu,Hongli Deng,Yizhi Yuan,Zhiqiang Zhu,Jian Zhu","doi":"10.1039/d6ta05610e","DOIUrl":"https://doi.org/10.1039/d6ta05610e","url":null,"abstract":"Small-molecule organic carbonyl compounds (SMOCCs) are promising cathode materials for lithium-ion batteries (LIBs) due to their high theoretical capacity and sustainable resource potential. However, their practical application is hindered by severe dissolution in organic electrolytes and poor intrinsic electronic conductivity. This work proposes a synergistic strategy integrating molecular design of SMOCCs benzo [b] naphtho [2', 3': 5, 6] [1, 4] dithiino [2, 3-i] thianthrene5, 7, 9, 14, 16, 18hexone (4S6Q) with complete encapsulation configurational engineering of graphene oxide (GO) to suppress dissolution and construct an efficient conductive network. Controlled configurational transition from island-like partial coverage to a continuous complete encapsulation network, effectively blocks active material-electrolyte direct contact and enhances interfacial charge transfer via strong π-π interactions. As a result, the cathode exhibits a reversible capacity of 206.4 mAh g -1 , excellent rate performance (88.1% capacity retention at 2.0 A g -1 ), and ultra-long cycling life (nearly 100% capacity retention after 1500 cycles). This work provides a clear and feasible research pathway for developing high-performance, long-life organic electrodes.","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":"1 1","pages":""},"PeriodicalIF":11.9,"publicationDate":"2026-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149152790","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
The Role of Mo in Nucleating Large Niobate Crystals for Li-ion Battery Anodes 钼在锂离子电池阳极大铌酸盐晶体成核中的作用
IF 11.9 2区 材料科学
Journal of Materials Chemistry A Pub Date : 2026-10-14 DOI: 10.1039/d6ta04984b
Stephanie Bazylevych,Nicolas Durand-Marandi,Janine Richter,Eric McCalla
{"title":"The Role of Mo in Nucleating Large Niobate Crystals for Li-ion Battery Anodes","authors":"Stephanie Bazylevych,Nicolas Durand-Marandi,Janine Richter,Eric McCalla","doi":"10.1039/d6ta04984b","DOIUrl":"https://doi.org/10.1039/d6ta04984b","url":null,"abstract":"High-power Wadsley-Roth anodes such as Nb 16 W 5 O 55 and Nb 18 W 16 O 93 show strong promise for safe, high-performance Li-ion batteries, driving significant interest and exploration of Nb-based oxide materials. However, these materials typically require high synthesis temperatures (e.g. 1200 °C) while previous studies on Nb-Mo-O materials show their formation at far lower temperatures (near 700 °C). Herein, high-throughput methods were used to systematically explore the entire Nb-W-Mo-O pseudoternary for the first time, and this revealed high performers in the ternary space at the modest synthesis temperature of 725 °C. Two solid-solution regions were identified, with Mo incorporation yielding much larger crystallites than along the Nb-W-O pseudobinary, demonstrating its ability to accelerate crystal growth in the sol-gel synthesis. Optimal materials exhibit initial capacities over 300 mAh g -1 alongside sustained cycling performance, particularly at 37 °C. These findings establish Nb-W-Mo-O as promising high-power anodes and demonstrate a cost-effective low temperature pathway toward high-performance materials.","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":"3 1","pages":""},"PeriodicalIF":11.9,"publicationDate":"2026-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149173182","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
Core-Shell-Shell CdS@PTh@COF with a Conductive Polymer Interlayer: Wiring a Dual Z-Scheme Heterojunction for Boosted Photocatalytic Hydrogen Production 芯壳壳CdS@PTh@COF与导电聚合物中间层:布线双z方案异质结促进光催化制氢
IF 11.9 2区 材料科学
Journal of Materials Chemistry A Pub Date : 2026-10-14 DOI: 10.1039/d6ta07038h
Jiandong Yang,Li Chen,Hajun Xue,Jiarui Shi,Shaohua Qu,Kang Liu,Haixia Ma,Zhaoqi Guo
{"title":"Core-Shell-Shell CdS@PTh@COF with a Conductive Polymer Interlayer: Wiring a Dual Z-Scheme Heterojunction for Boosted Photocatalytic Hydrogen Production","authors":"Jiandong Yang,Li Chen,Hajun Xue,Jiarui Shi,Shaohua Qu,Kang Liu,Haixia Ma,Zhaoqi Guo","doi":"10.1039/d6ta07038h","DOIUrl":"https://doi.org/10.1039/d6ta07038h","url":null,"abstract":"Photocatalytic hydrogen evolution is a promising route for solar-to-chemical conversion, but its efficiency is hampered by rapid charge recombination and poor interfacial charge transfer in photocatalysts. Here, we construct a core-shell-shell CdS@PTh@COF dual Z-scheme heterojunction in which polythiophene (PTh) acts as a conductive interlayer between the inorganic CdS core and the organic COF shell. Under visible-light irradiation, the built-in electric fields at the CdS/PTh and PTh/COF interfaces drive selective recombination of photogenerated electrons from CdS and COF with holes in PTh, yielding spatially separated strongly reducing electrons on PTh and strongly oxidizing holes on CdS and COF. The optimized CdS@PTh-4@10COF achieves a hydrogen evolution rate of 22.39 mmol•g -1 •h -1 , approximately 16.8 and 3.6 times those of pristine CdS and COF, respectively. Systematic characterization and electrochemical measurements reveal that the PTh bridge effectively suppresses charge recombination, lowers interfacial transfer resistance, and extends carrier lifetime. This work demonstrates that engineering a conductive polymer interlayer represents a viable strategy for constructing dual Z-scheme heterojunctions with enhanced charge separation and photocatalytic performance.","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":"7 1","pages":""},"PeriodicalIF":11.9,"publicationDate":"2026-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149173184","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
Synergistic Enhancement of Interfacial Stability of PEO -Based Solid -State Electrolytes via PVP -Mediated Amide-Bond-Regulated Li + Competitive Coordination and In Situ Interfacial Regulation by LiTDI Cyano Groups 通过PVP介导的酰胺键调节的Li +竞争配位和LiTDI氰基原位界面调节协同增强PEO基固态电解质的界面稳定性
IF 11.9 2区 材料科学
Journal of Materials Chemistry A Pub Date : 2026-10-13 DOI: 10.1039/d6ta06841c
Chaohua Song,Yinhui Li,Zhaoyu Sun,Xiaohan Chen,Jun Liu,Sibudjing Kawi
{"title":"Synergistic Enhancement of Interfacial Stability of PEO -Based Solid -State Electrolytes via PVP -Mediated Amide-Bond-Regulated Li + Competitive Coordination and In Situ Interfacial Regulation by LiTDI Cyano Groups","authors":"Chaohua Song,Yinhui Li,Zhaoyu Sun,Xiaohan Chen,Jun Liu,Sibudjing Kawi","doi":"10.1039/d6ta06841c","DOIUrl":"https://doi.org/10.1039/d6ta06841c","url":null,"abstract":"Polyethylene oxide (PEO) electrolytes have demonstrated significant potential in the field of all-solid-state lithium metal batteries (ASSLMBs) due to their excellent Li + coordination ability and processability. However, their low oxidation potential and poor interfacial stability limit their practical application. Here, we employ a synergistic strategy combining bulk modification and interfacial modification to enhance the electrochemical performance of PEO electrolytes in ASSLMBs. In this work, polyvinylpyrrolidone (PVP) was used to bind with Li + via C=O bonds, dissociating Li + -TFSI -clusters and increasing the content of active Li + . Furthermore, the decomposition voltage of PEO was improved by regulating the Li + coordination environment through modulation of ionic domaining behavior. In addition, the film-forming properties of PEO were improved through hydrogen bonding interactions between PVP and PEO, thereby broadening the bulk Li + transport pathways. Additionally, lithium 4,5-dicyano-2-(trifluoromethyl) imidazol-1-ide (LiTDI) was incorporated into the electrolyte to construct a TDI -/TFSI -dual-anion environment. TDI -preferentially decomposes on the electrode: it forms a LiF/Li 3 N-based SEI on the anode to improve the reversibility of lithium deposition and stripping, while its -C≡N groups oxidize on the cathode to form a stable CEI film, enhancing the cycling stability of solid-state lithium-metal batteries. This synergistic effect suppresses impedance growth. After 500 cycles at a 0.5 C rate, the LFP||Li battery retained 84.3% of its capacity. This study provides a new strategy for achieving stable cycling of ASSLMBs using PEO-based composite electrolytes.","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":"90 1","pages":""},"PeriodicalIF":11.9,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149152791","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
Bioinspired Nanocellulose-Functionalized PVDF Membrane for Simultaneously Maintaining High-Flux and Efficient Nanoplastics Filtration 生物启发纳米纤维素功能化PVDF膜同时保持高通量和高效的纳米塑料过滤
IF 11.9 2区 材料科学
Journal of Materials Chemistry A Pub Date : 2026-10-13 DOI: 10.1039/d6ta05928g
Xuan Shu,Yongbin Chen,Minjie Hou,Jiarui Liang,Xinyu Yan,Huiyang Bian,Chuanfu Liu
{"title":"Bioinspired Nanocellulose-Functionalized PVDF Membrane for Simultaneously Maintaining High-Flux and Efficient Nanoplastics Filtration","authors":"Xuan Shu,Yongbin Chen,Minjie Hou,Jiarui Liang,Xinyu Yan,Huiyang Bian,Chuanfu Liu","doi":"10.1039/d6ta05928g","DOIUrl":"https://doi.org/10.1039/d6ta05928g","url":null,"abstract":"Nanoplastics (NPs) pose growing environmental and health concerns owing to their small size, high mobility, and ability to penetrate biological barriers. However, efficient NP separation remains challenging because conventional membrane filtration often suffers from the trade-off between separation efficiency and water flux. Herein, a bioinspired composite membrane was developed by integrating a polydopamine/polyethylenimine (PDA/PEI) interfacial layer and a TEMPO-oxidized cellulose nanofiber (TCNF) functional coating onto a poly(vinylidene fluoride) (PVDF) ultrafiltration membrane. The PDA/PEI layer provided robust interfacial adhesion and abundant active sites for TCNF immobilization, while the hydroxyl- and carboxyl-rich TCNF network established a highly accessible hydrated interface that promoted nanoplastic capture through enhanced interfacial interactions. The optimized membrane achieved a high pure-water flux of 9857.3 L m⁻² h⁻¹ and nanoplastic rejection efficiencies exceeding 99.0% for 100 nm amino-functionalized polystyrene nanoparticles. Hermia model analysis revealed that nanoplastic rejection was dominated by cake filtration, with nanoparticles preferentially retained on the membrane surface rather than penetrating into the membrane interior. Molecular dynamics simulations further demonstrated that the hydrated TCNF interface strengthened hydrogen bonding, electrostatic attraction, and interfacial contact with nanoplastics, thereby stabilizing retained particles and promoting surface capture. Moreover, the excellent interfacial stability and reusability of the membrane enabled robust performance across diverse filtration scenarios, while maintaining an intact coating structure and stable separation efficiency throughout repeated filtration cycles. This work provides an effective bioinspired interfacial engineering strategy for constructing high-flux membranes with enhanced nanoplastic rejection and offers mechanistic insights into interfacial regulation for advanced water purification.","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":"33 1","pages":""},"PeriodicalIF":11.9,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149152051","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
Lattice expansion enhances electrochromism while surface Ni-site dilution suppresses oxygen evolution in divalent-doped NiO 在二价掺杂的NiO中,晶格膨胀增强电致变色,而表面ni位点稀释抑制析氧
IF 11.9 2区 材料科学
Journal of Materials Chemistry A Pub Date : 2026-10-13 DOI: 10.1039/d6ta05737c
Muhammad Waseem Yaseen,Xuefei Li
{"title":"Lattice expansion enhances electrochromism while surface Ni-site dilution suppresses oxygen evolution in divalent-doped NiO","authors":"Muhammad Waseem Yaseen,Xuefei Li","doi":"10.1039/d6ta05737c","DOIUrl":"https://doi.org/10.1039/d6ta05737c","url":null,"abstract":"In redox-active oxides, the same metal–oxygen redox chemistry that stores the charge can drive catalytic reactions at the electrolyte interface. In nickel oxide, anodic Ni–O redox produces electrochromic coloration and overlaps with the oxygen evolution reaction (OER) at higher potentials. This overlap limits coloration efficiency because the OER proceeds as a parasitic side reaction. The two responses have distinct structural requirements: coloration depends on the oxidation state of the Ni site and ion-coupled charge compensation in the lattice, whereas the OER depends on adjacent oxidized Ni–O sites at the surface. Here, we substitute Ni2+ with transparent redox-inactive cations (Zn2+, Mg2+, or Ca2+) with different size mismatch relative to Ni2+, which perturb the lattice and dilute surface Ni sites. In all three dopant series, the optical contrast increases at moderate content and decreases at 10% nominal doping; the enhancement is the largest for Ca2+, which produces the largest lattice expansion. The OER-region current instead decreases monotonically across the Zn series and at 10% for Mg and Ca, with the strongest suppression for Ca2+ despite its lowest incorporated dopant content. Operando UV-vis spectroelectrochemistry shows that the OER reaction order with respect to oxidized Ni–O species increases toward the pair-site value of two for all three dopants, consistent with reduced cooperativity among oxidized Ni–O species after substitution. Redox-inactive modification at moderate content thus enhances the electrochromic response through the lattice expansion and suppresses oxygen evolution through the dilution and disruption of the surface Ni network.","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":"6 1","pages":""},"PeriodicalIF":11.9,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149152793","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
From Molecular Reorganization to Nanoscale Heterogeneity: The Role of DMF in Aqueous Fe Electrodeposition Electrolytes 从分子重组到纳米尺度的非均质性:DMF在水铁电沉积电解质中的作用
IF 11.9 2区 材料科学
Journal of Materials Chemistry A Pub Date : 2026-10-13 DOI: 10.1039/d6ta06484a
Yunkai Sun,Nguyen Huong,Shivam Singh,Xingyi Lyu,Álvaro Vázquez-Mayagoitia,Jordi Cabana,Tao Li,Brian J Ingram,Zhenzhen Yang
{"title":"From Molecular Reorganization to Nanoscale Heterogeneity: The Role of DMF in Aqueous Fe Electrodeposition Electrolytes","authors":"Yunkai Sun,Nguyen Huong,Shivam Singh,Xingyi Lyu,Álvaro Vázquez-Mayagoitia,Jordi Cabana,Tao Li,Brian J Ingram,Zhenzhen Yang","doi":"10.1039/d6ta06484a","DOIUrl":"https://doi.org/10.1039/d6ta06484a","url":null,"abstract":"Incorporating a secondary organic solvent into aqueous electrolytes is a promising strategy for tuning solvent structure, suppressing parasitic reactions, and improving electrodeposition performance. Rational co-solvent selection requires mechanistic understanding of how the additive modifies metal-ion solvation, bulk electrolyte chemistry and transport, and interfacial electrochemistry. Here, we investigate dimethylformamide (DMF)/water mixed solvents for Fe electrodeposition from FeSO₄ electrolytes by testing these mechanisms. XANES and EXAFS show that below 50 vol% DMF, Fe(II) remains predominantly aqua-coordinated, indicating little change in the primary Fe(II) coordination environment. FTIR shows that DMF measurably reorganizes the DMF-H₂O hydrogen-bond network, consistent with reduced bulk-water-like activity. Electrochemical measurements show that DMF suppresses both HER and Fe deposition, while deposition efficiencies collapse approximately onto a common trend when normalized by the Fe limiting current, indicating that performance is governed primarily by bulk transport with changed viscosity and resistance. XPS detects no DMF-derived nitrogen on deposited Fe, and cathodic stability measurements indicate that DMF decomposition occurs well beyond the Fe deposition potential window, arguing against a dominant interfacial decomposition mechanism. Instead, the main practical benefit of DMF is bulk electrolyte stabilization that DMF suppresses Fe(III)-driven hydrolysis, raises the natural pH, and shifts the electrolyte open-circuit potential farther from the Fe(II)/Fe₂O₃·xH₂O instability boundary without substantially altering Fe(II)/Fe(0) thermodynamics. These findings show that DMF acts primarily through bulk solvent reorganization, Fe(III) stabilization, and transport modification rather than through strong direct Fe(II) solvation or persistent interfacial restructuring, and they provide a mechanistic framework for co-solvent design in aqueous Fe electrosynthesis.","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":"33 1","pages":""},"PeriodicalIF":11.9,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149152794","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
Engineering a triple-enhanced graphite cathode from waste: holey, defective, and N-doped architectures for stable Li–O batteries 利用废弃的多孔、缺陷和掺氮的三层增强石墨阴极,用于稳定的锂离子电池
IF 11.9 2区 材料科学
Journal of Materials Chemistry A Pub Date : 2026-10-13 DOI: 10.1039/d6ta04966d
Jiakui Zhang,Ran Bi,Lingyun Zhou,Liang Liu,Qinghua Fan,Jianyuming Zhang,Jiantie Xu
{"title":"Engineering a triple-enhanced graphite cathode from waste: holey, defective, and N-doped architectures for stable Li–O batteries","authors":"Jiakui Zhang,Ran Bi,Lingyun Zhou,Liang Liu,Qinghua Fan,Jianyuming Zhang,Jiantie Xu","doi":"10.1039/d6ta04966d","DOIUrl":"https://doi.org/10.1039/d6ta04966d","url":null,"abstract":"The sustainable reutilization of waste graphite from used lithium-ion batteries represents an important strategy for eco-friendly resource recovery. In this work, we successfully convert the graphite into N-doped expanded holey graphene (N-EhGH) as a cathode for lithium–oxygen batteries (LOBs) through H2O activation and nitrogen doping techniques. The synthesized N-EhGH possesses an expanded holey architecture with an ultrahigh specific surface area, which significantly facilitates the mass transport and storage of Li+ and O2. Experimental characterization studies combined with theoretical calculations demonstrate that the synergistic effect between carbon defects and pyrrolic-N species optimizes the electronic configuration and strengthens Li2O2 binding, thereby promoting oxygen redox kinetics. Benefiting from these structural and electronic advantages, the N-EhGH cathode exhibits exceptional electrochemical performance, achieving a maximum specific capacity of 11 816 mAh g−1 at 300 mA g−1 and maintaining remarkable cycling stability over 800 cycles with a limited capacity of 1000 mAh g−1 at 1000 mA g−1.","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":"1 1","pages":""},"PeriodicalIF":11.9,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149152796","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
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