Coatings
·
2024
·Vol. 14
·期 5
·631
·
IF 2.9
Leiyu Du,Renxin Xu,Yunfa Si,Wei Zhao,Hongyi Luo,Wei Jin,Dan Liu
Developing microwave absorbers with superior low-frequency electromagnetic wave absorption properties is one of the foremost important factors driving the boom in 5G technology development. In this study, via a simple hydrothermal and pyrolysis strategy, randomly interleaved CoNiO2nanosheets and uniformly ultrafine CoNi nanocrystals are anchored onto both sides of a single-layered MXene. The absorption mechanism demonstrated that the hierarchical heterostructure prevents the aggregation of MXene nanoflakes and magnetic crystallites. In addition, the introduction of the double-magnetic phase of CoNiO2/CoNi arrays can not only enhance the magnetic loss capacity but also generate larger void spaces and abundant heterogeneous interfaces, collectively promoting impedance-matching and furthering microwave attenuation capabilities at a low frequency. Hence, the reflection loss of the optimal absorber (M–MCNO) is −45.33 dB at 3.24 GHz, which corresponds to a matching thickness of 5.0 mm. Moreover, its EAB can entirely cover the S-band and C-band by tailoring the matching thickness from 2 to 7 mm. Satellite radar cross-section (RCS) simulations demonstrated that the M–MCNO can reduce the RCS value to below −10 dB m2over a multi-angle range. Thus, the proposed hybrid absorber is of great significance for the development of magnetized MXene composites with superior low-frequency microwave absorption properties.
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2025
·
IF 1.1
Ziling Zhuang,Shiqi Li,Chen Chen,Shengyong Mo,Fengwei Zhang,Yurong Cai
In view of the problem that epoxy resin cannot achieve effective flame retardancy, smoke and toxic gas suppression functions in fire, and poor interface compatibility with flame retardants, a coreshell structure with SiO 2 as the nucleus was designed, and a new multi-component flame retardant was prepared by introducing Ni and phytic acid using metalorganic frameworks (MOFs) as precursors. After mixing and curing with epoxy resin, the SiO 2 /CoNi-DH-PA/EP was obtained. With only 5% SiO 2 /CoNi-DH-PA added, the peak heat release, total smoke production, and total CO production of epoxy resin composites are reduced by 63.72%, 31.88%, and 63.74%, respectively, and the residue yield increased from 15.05% to 24.40%. It has been verified that SiO 2 , Co-Ni bimetallic ions and phytic acid have synergistic effects, which can induce and catalyze the formation of a complete and dense carbon layer. This significantly reduces the heat release, smoke, and toxic gas production, thereby reducing the fire hazard of epoxy resin. Additionally, the SiO 2 /CoNi-DH-PA/EP ensures good mechanical properties.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Zexiang Liu,Ke He,Zhiguang Yang,Zijie Xu,Meiyu Li,Jinming Zhang,Chenxue Yao,Qianqian Chen,Xiaochen Li
Metal–organic framework (MOF)-derived materials show great potential as highly efficient and stable electrocatalysts for the oxygen evolution reaction (OER). However, conventional derivation strategies (such as high-temperature calcination and chemical etching) often require harsh reaction conditions and inevitably compromise the structural integrity of the material, thereby limiting their practical applicability. To address this challenge, this study presents an innovative room-temperature dielectric barrier discharge (DBD) plasma surface engineering approach that enables the precise activation of CoNi-MOF-74 catalysts at room temperature. After DBD treatment, the surface of NF/PMOF is etched, generating cracks and exposing the nanoporous structure of the internal framework. Remarkably, through merely 5 min of DBD surface treatment, the resulting catalyst NF/PMOF5 achieves an ultralow overpotential of 173 mV at a current density of 10 mA cm–2 and a Tafel slope of 43 mV·dec–1, demonstrating a remarkable improvement compared to the untreated sample (307 mV, 109.5 mV·dec–1). The catalyst also exhibits outstanding stability, with minimal potential shift (<20 mV) after 4000 cycles. Detailed characterization reveals that the DBD treatment maintains the crystalline integrity of MOF-74 while simultaneously optimizing the electronic structure and generating high-density surface CoNi-oxide nanoclusters, which significantly enhance the OER kinetics. Owing to its green and mild treatment conditions, this noncarbonization activation strategy not only provides more options for MOF catalyst design but also demonstrates advantages in the processing of flexible electronic devices.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Aiqin Zhang,Huan Zhang,Bin Hu,Minghua Wang,Shuai Zhang,Qiaojuan Jia,Linghao He,Zhihong Zhang
In this study, a series of one-dimensional (1D)/two-dimensional (2D) heterostructure hybrids were fabricated through the in situ growth of a Co and Ni bimetallic zeolitic imidazolate framework (CoNi-ZIF) around N -doped carbon nanotubes ( N -CNTs). The hybrids were further exploited as effective supercapacitor materials. The N -CNTs were prepared by carbonizing a mixture of glucose and the melamine–cyanuric acid complex at a high temperature (900 °C) under N 2 atmosphere and applied as the template for the in situ synthesis of CoNi-ZIF nanosheets (NSs). The 1D N -CNTs in the hybrids can act as the high-way for charge transfer to boost the faradaic reactions. Changing the usage of metal precursors not only provided abundant redox reaction sites in 2D CoNi-ZIF NSs but also modulated the microstructures and chemical components of the hybrids. The integration of the features of N -CNTs and CoNi-ZIF NSs can result in a synergistic effect between N -CNTs and CoNi-ZIF NSs. Therefore, the obtained CoNi-ZIFs and N -CNTs hybrid ( [email protected] N -CNT) exhibited superior electrochemical capacitive performance. Comparison revealed that the [email protected] N -CNT-2 hybrid, which was prepared with a 1:1 mass ratio of Co(NO 3 ) 2 ·6H 2 O and Ni(NO 3 ) 2 ·6H 2 O, displayed the largest specific capacitance of 1118F g −1 at 1 A g −1 , which was higher than the capacitance of most reported metal–organic framework (MOF)-based supercapacitor electrodes. Moreover, the asymmetric supercapacitor based on the [email protected] N -CNT-2 electrode exhibited a high energy density of 51.1 Wh kg −1 at the power density of 860.1 W kg −1 and good cycle stability. This work can provide a facile and effective way for the fabrication of heterostructured 1D/2D nanostructures based on 2D MOFs for advanced energy storage.
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Yanzhi Cai,Xue Huang,Laifei Cheng,Yalong Chai,Zixuan Yu,Mingxing Chen,Shaoxiong Ren,Jiaoe Dang
Achieving self-supporting superflexible binder-free composites where all components serve simultaneously as structural backbones and microwave-absorbers is a technical challenge. This study successfully combined several microwave absorbing materials, including Fe 3 O 4 , NiCo-MOF derivatives, and CNTs, into a binder-free self-supporting superflexible Buckypaper in one step through directional pressure filtration. Fe 3 O 4 -CoNi-MOF was in-situ grown on a single CNT to form a magnetic MOF-coated CNT (CNT@MOF), which was then subjected to high-temperature carbonization to obtain a magnetic MOF-derived carbon-coated CNT (CNT@Fe 3 O 4 /CoNi-C). The combination of Fe₃O₄/CoNi-MOF and CNTs simultaneously promotes magnetic loss and dielectric loss, thereby significantly enhancing impedance matching and electromagnetic energy attenuation capabilities. The optimal carbonization temperature for the CNT@Fe 3 O 4 /CoNi-C Buckypaper is 700 ℃, at which the minimum reflection loss (RL min ) is −58.12 dB and the absorption bandwidth is 5.02 GHz. The interweaving of CNTs forms a robust yet superflexible skeleton, while the in-situ growth of Fe₃O₄/CoNi-MOF derivatives on a single CNT enhances the structural stability of the skeleton. The Buckypaper remains intact after repeated 2 mm-radius curling, knotting, 180° bending. Therefore, this study presents new insights into the preparation of self-supporting, superflexible MOF-derived microwave absorption materials.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Jingqiu Li,Yi Feng,Lvye Yang,Jianfeng Yao
Metal ion-induced etching can effectively convert zeolitic imidazolate frameworks (ZIFs) to CoNi-layered double hydroxides (LDH). Here, different metal-ion-assisted etching methods are utilized to convert Co-ZIF-L to CoNi-LDH with various morphologies and electrochemical properties . The resultant CoNi-LDH (CoNi-1) with a composition of Co 0.7 Ni 0.3 (OH) 2 displayed a high electrochemical performance when Co-ZIF-L was treated in N, N -dimethylformamide-ethanol solution containing Co 2+ ions followed by Ni 2+ ion-induced etching under hydrothermal condition. The improved electrochemical performance of CoNi-1 can be attributed to structural advantages, where the well-dispersed ultrathin CoNi-LDH layers favor the exposure of surface active sites and promote ion diffusion to maximize electrochemical properties.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2026
·
IF 9.9
Mingyuan Xu,Zhaoqing Lu,Tao Jiang,Pengbo Yang,Li Hua,Chunting Li,Ruixue Pang,Ting Sun,Fengfeng Jia
The development of high-performance electromagnetic wave (EMW) absorption materials that are effective in harsh environments remains a significant challenge. Herein, a lightweight, flexible, and robust three-dimensional hybrid aerogel is fabricated for efficient broadband EMW absorption. The aerogel is constructed by integrating metal-organic framework (MOF)-derived magnetic CoNi@C nanoparticles and carboxylated multi-walled carbon nanotubes (c-MWCNTs) into an aramid nanofiber (ANF) framework. The synergistic effect between the components endows the composite with remarkable attenuation capability via conductive loss, dielectric loss, magnetic loss, and interfacial polarization. The optimized aerogel exhibits exceptional EMW absorption performance, achieving a minimum reflection loss (RL min ) of −59.66 dB at a thickness of 2.68 mm and a broad effective absorption bandwidth (EAB) of 7.96 GHz at a thickness of 2.94 mm. This work provides a promising strategy for designing advanced EMW absorption materials with integrated properties of strong absorption, wide bandwidth, and environmental resistance for use in aerospace, military, and electronic protection fields.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Zhongtai Lin,Xue Li,Shengnan Li,Bin Li,Jianxu Ding,Yongqin Han,Tingxi Li,Chunping Hou,Yong Ma
Layered double hydroxide (LDH) has become one of the prospective electrode materials due to high specific area, good cycle stability and high power density. However, large internal resistance limits its application in energy storage. The introduction of materials with high electrical conductivity is expected to solve this problem. In here, carbon cloth/MXene/PANI/CoNi-LDH (CC/MXPACN) composites are fabricated by the electrodeposition of PANI and CoNi-LDH on the CC coated with MXene . The effects of electrodeposition time on the electrochemical performances are investigated in detail. The asymmetric supercapacitor is assembled with CC/MXPACN as the positive electrode and activated carbon (AC) as the negative electrode . The device has a 1.6 V voltage window. After 10,000 cycles at a current density of 5 A g −1 , the capacitance retention rate is still 91 %. At the power density of 399.95 W kg −1 , the energy density of 39.33 Wh kg −1 is provided. Even at the high power density of 2400.35 W kg −1 , the energy density can still reach 27.27 Wh kg −1 . The asymmetric device has high specific capacitance, long-term stability and good power density and energy density, which exhibit a huge potential in energy storage applications .
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Zhibin Liu,Xiuping Sun,Zhirong Sun
Developing highly efficient, stable, recyclable, and application value heterogeneous catalysts in advanced oxidation processes has essential application value in the degradation of refractory pollutants. In this paper, the CoNi alloy anchored onto N-doped porous carbon (CoNi-600@NC) catalyst was prepared using bimetallic doped metal-organic frameworks as precursors. The magnetic CoNi-600@NC can activate peroxymonosulfate (PMS) to degrade sulfamethoxazole (SMX). Therefore, SMX can be removed 100% within 25 min. CoNi-600@NC/PMS has a broad pH (3–9) application range, good applicability, and repeatability. Radical quenching, quantitative and electrochemical experiments proved that the degradation of SMX was dominated by free radical (Superoxide anions) and non-free radical pathways (surface-bound radicals). Mechanistic analysis showed that the interaction between Co-N x /pyridine N-sites and graphitized carbon with PMS induced the formation of surface-bound active species. Moreover, CoNi nanoparticles promoted the redox cycle of metals. The synergistic catalytic mechanisms between the CoNi alloy and the abundant functional groups gave CoNi-600@NC excellent catalytic properties and applicability. Using density functional theory predicted the reaction sites of SMX and proposed four degradation pathways. The toxicity of intermediates was comprehensively evaluated. In addition, a CoNi-600@NC continuous flow reactor was constructed with a daily treatment capacity of 45 L and 100% SMX removal. This study expands the application of persulfate advanced oxidation technology by synthesizing recyclable magnetic catalysts and provides new synergistic degradation mechanisms for removing refractory organics.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Ansai Zhang,Huiling Liu,Cheng Wang
Electrochemical water splitting is considered as a sustainable and clean technology for hydrogen production, but is still limited by the sluggish kinetics of anodic oxygen evolution reaction (OER). Hydrazine oxidation reaction (HzOR) requires much lower thermodynamic oxidation potential and produces zero-carbon molecules, thus becoming a promising alternative to replace OER for realizing energy-saving hydrogen production. Herein, a CoNi-bimetal phosphide nanoparticles embedded P doped carbon matrix structure ((Co 0.6 Ni 0.4 ) 2 P@PC) is constructed via annealing a novel precursor composed of CoNi-bimetal sites and P contained ligands for hydrazine-assisted water splitting. The P element can simultaneously in situ phosphorize the metal sites and carbon atoms. The (Co 0.6 Ni 0.4 ) 2 P@PC exhibits outstanding hydrogen evolution reaction (HER) performance with an overpotential of 67.9 mV at 10 mA cm −2 and requires an ultralow potential of -83 mV at 10 mA cm −2 for HzOR in alkaline electrolyte. Furthermore, the electrolyzer assembled with the (Co 0.6 Ni 0.4 ) 2 P@PC as both cathode and anode delivers a cell voltage of merely 0.048 V which is much lower compared with the OER-HER system (1.60 V) for reaching 10 mA cm −2 . The present work develops an eco-friendly synthetic method for designing low-cost and highly efficient carbon matrix incorporated phosphide electrocatalyst for energy-saving hydrogen production.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Xiaoxuan He,Jintang Zhou,Jiaqi Tao,Yijie Liu,Bo Wei,Zhengjun Yao,Xuewei Tao
Magnetoelectric coupling is a key strategy to obtain high-performance microwave absorption materials. Especially for carbon matrix composites , the absorbing capacity can be optimized via the tuning of the graphitization degree and the content ratio of the magnetic and dielectric components. Based on this theory, a simple strategy, consisting of the solvothermal method and annealing in an inert atmosphere , is adopted in this study to combine CoNi magnetic alloys with graphitized carbon into micron-scale composite spherical particles. Additionally, special attention is paid to the correlation among the graphitization degree of carbon matrix, component proportion, and dielectric response ability, so as to achieve a flexible micromorphology design and a tunable microwave absorption performance. When the pyrolysis temperature is offset to the best of 700 ℃, a broadband absorption of 6.61 GHz (reflection loss < − 10 dB) is achieved at an ultrathin matching thickness of 1.9 mm. Adjusting the carbon content can further optimize the impedance matching and realize a high-intensity absorption with a reflection loss of − 72.7 dB. Our work proposes a useful strategy to realize the effective combination of the magnetic and dielectric loss mechanisms and boost the microwave absorption capacity toward achieving the desired broadband and a high-efficiency absorption performance.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Wenji Zheng,Jingbang Yu,Zhongyue Hu,Xuehua Ruan,Xiangcun Li,Yan Dai,Gaohong He
Layered double hydroxide (LDH) bearing numerous hydroxyl groups shows high affinity with CO 2 and is promising in mixed matrix membranes (MMMs) based CO 2 capture. However, its non-porous structure limits the further improvement of CO 2 permeability. In this work, 3D hollow CoNi-LDH nanocages were developed to construct low-resistance and CO 2 -philic transport channel in MMM by in-situ etching of ZIF-67 template. The resultant material exhibits hollow structure with cavity size of about 500 nm, mesopores and micropores from LDH stacking and ZIF-67 template. The outer layered CoNi-LDH nanosheets can attract more CO 2 molecules by their abundant hydroxyl groups, resulting in an improvement in dissolution selectivity of CO 2 over N 2 . Meanwhile, the tortuous gas diffusion paths originated from 2D nanosheet stacking can further enhance the CO 2 selectivity over N 2 . Moreover, the hollow nanocages provide CO 2 molecules with fast transport path, resulting in high CO 2 permeability. As a result, compared with pure Pebax membrane and 2D LDH/Pebax MMM, all the 3D hollow CoNi-LDH/Pebax MMMs present enhanced CO 2 permeability. The 3D hollow CoNi-LDH-2h/Pebax MMM performs the highest CO 2 permeability of 135.49 Barrer, which are increased by 141.95% and 71.50% than those of the above two membranes, respectively. The selectivity of 3D hollow CoNi-LDH-2h/Pebax MMM is about 26.30% higher than that of the pure Pebax membrane. The present membrane presents comparable CO 2 capture capacity in contrast with most reported Pebax based MMMs and surpasses the Robeson upper bond. Together with the good long-term stability, the 3D hollow CoNi-LDH nanocages are believed to be a promising candidate for MMMs to improve CO 2 capture.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）