COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Jiajia Li,Jiaqi Qian,Xiaoyu Chen,Xiaoxi Zeng,Ling Li,Bo Ouyang,Erjun Kan,Wenming Zhang
A novel Co/Ni metal-organic framework (MOF)-derived three-dimensional (3D) nanoarchitecture in which graphene carbon-coated CoNi alloy nanoparticles grow on the tips of N-doped carbon nanotubes that are vertically-aligned on carbon nanofibers (Co/Ni@GC/NCNTs/CNFs) is fabricated. The Co/Ni@GC/NCNTs/CNFs electrode has a half-wave oxygen reduction reaction (ORR) potential of 0.80 V, a superior standing stability with 84.8% current retention after 175 000 s. The oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) reach a lower overpotential of 0.395 V and 0.15 V, respectively. Moreover, the resultant sample is an air cathode catalyst in a microbial fuel cell and indicates an utmost power density of 2100 ± 45 mW cm −2 , which is much better than that of the Pt/C electrode (1334 ± 61 mW m −2 ). The density functional theory calculation demonstrates that the designed Co/Ni@GC/NCNTs/CNFs catalyst can remarkably promote OER, ORR, and HER performance.
研究领域:
材料科学
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电化学
·
纳米技术
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催化
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能源存储与转换
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Jiana Hu,Caiyun Liang,Jiadong Li,Chuanwei Lin,Yongjiu Liang,Dewen Dong
2D transition metal carbide/nitride (MXene) nanomaterials have prospective applications in high-performance microwave absorption (MA). However, the excessively high permittivity, absence of magnetic loss, and susceptible oxidizability of MXene severely hinder the enhancement of its MA properties. Here, we used a facile organic solution–phase thermal decomposition method to prepare dielectric–magnetic MXene@CoNi nanocomposites with heterojunctions , which can effectively prevent the oxidation of MXene . Subsequently, the MXene@CoNi nanocomposites were integrated with magnetic CoNi alloys, MXene microspheres (MXene MPs), and a silicon rubber (SR) matrix to construct multilayered CoNi/MXene@CoNi/MXene MPs/SR composites by casting and curing. Benefiting from the multilayered structure and complementary effects of the dielectric and magnetic components, the multilayered CoNi/MXene@CoNi/MXene MPs/SR composites composed of matching, absorbing, and reflective layers showed a remarkable minimum reflection loss of −53.3 dB and an ultra-broad effective absorption bandwidth up to 11.12 GHz at a thickness of 2.96 mm. These results demonstrated the developed multilayered composites are promising candidates for high-performance MA. Our study provides new insights into the development of ultra-broadband MXene-based absorbent materials.
研究领域:
材料科学
·
电磁学
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DOI
高影响因子
ACS Applied Nano Materials
·
2026
·
IF 5.8
Bozhen Wu,Yanghua Song,Zhongpu Shi,Shijie Zhang,Yongkang Meng,Hanghang Zhang,Jintao Yang
With the growing demand for flexible electronic systems, requirements for electromagnetic interference (EMI) shielding materials are also increasing. These materials must not only be lightweight and deformable but also provide excellent shielding performance. However, traditional shielding materials often face challenges: it is difficult to balance shielding effectiveness, flexibility, and weight. To address these challenges, this study designed a multilayer cobalt–nickel alloy (CoNi)/transition-metal carbide/nitride (MXene)/CoNi/MXene/thermoplastic polyurethane (TPU) nanocomposite film employing an “absorption–reflection–reabsorption” electromagnetic attenuation strategy, which was fabricated through processes including electrospinning, vacuum-assisted filtration, and interfacial bonding. Its structure consists of a surface magnetic absorption layer composed of CoNi nanoparticles anchored within electrospun TPU nanofibers; an intermediate magnetoelectric transition layer in which CoNi nanoparticles are grown in situ on two-dimensional MXene nanosheets to form MXene/CoNi nanoheterostructures; and a bottom conductive reflective layer consisting of a continuous MXene nanosheet network deposited on a TPU fiber membrane. The hierarchical nanoheterostructures at each interface enable synergistic magnetic loss, conductive loss, and interfacial polarization loss, yielding an absorption-dominant shielding mechanism. Experimental results demonstrate that the composite film achieves an overall electromagnetic interference shielding effectiveness (EMI SE) of 30.89 dB with an absorption coefficient (A) of 0.56 at an ultrathin thickness of just 0.27 mm, exhibiting a highly efficient shielding mechanism dominated by absorption. The nanorough surface architecture also imparts outstanding hydrophobicity. Durability tests confirm that the film retains EMI SE above the commercial threshold after 15 days of aqueous immersion, 15 days of thermal oxidation at 50 °C, and 200 cyclic tensile deformations, demonstrating acceptable functional durability for practical flexible and wearable electromagnetic shielding applications.
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2026
·
IF 9.7
Zehao Tan,Guiru Zhang,Enping Wang,Xiaojing Cheng,Jiewei Yin,Xiaohui Yan,Guanghua Wei,Shuiyun Shen,Liuxuan Luo,Junliang Zhang
Dual-metal single-atom catalysts (DACs) can break the electronic and structural symmetries of the M–N₄ unit and have attracted intensive attention. In this work, CoNi@CoNi–NCs were prepared via an impregnation-reduction method, which possess coexisting CoNi–NC DACs and encapsulated CoNi dilute alloy nanoparticles (NPs). After optimizing the Co/Ni atomic ratio, Co 10 Ni 1 @CoNi–NC exhibited superior oxygen reduction reaction (ORR) durability. After 30,000 accelerated durability test (ADT) cycles, the half-wave potential of CoNi@CoNi–NCs only decreased by 15 mV, which is significantly better than commercial Pt/C (72 mV). Zinc–air battery (ZAB) tests demonstrated that the Co 10 Ni 1 @CoNi–NC ZAB achieved the peak power density of 149.91 mW cm −2 , which is much higher than that of commercial Pt/C (122.65 mW cm −2 ). After 240 h of charge-discharge cycling, the Co 10 Ni 1 @CoNi–NC ZAB maintained stable voltage efficiency with only a 14.9% decay, which is much better than that of commercial Pt/C. Based on the advanced and comprehensive experimental and theoretical analyses, the enhanced ORR performance of Co 10 Ni 1 @CoNi–NC in alkaline conditions can be attributed to the following reasons. (1) The influence of trace amounts of nickel on the Co 2+ and Co N electronic structures. (2) The regular morphological structure increases the number of pores and enhances the utilization rate of active sites. (3) The unique carbon coated structure. (4) The synergistic effect between CoNi NPs and CoNi–NCs. This work helps to understand the interplay between NPs and DACs and provides guidance for the further development of non-noble metal ORR catalysts.
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 8
·6381-6388
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IF 3.201
Guoqiang Liu,Xian Zhang,Cuijiao Zhao,Qizhong Xiong,Wanbing Gong,Guozhong Wang,Yunxia Zhang,Haimin Zhang,Huijun Zhao
Electrocatalytic water splitting as an environmentally friendly method to produce clean H2 has attracted wide attention. However, efficient improvement of the performance of the oxidation half-reaction during water splitting, thus enhancing H2 evolution efficiency, has become an urgent issue. Herein, non-precious metal Co0.83Ni0.17 alloy nanoparticles on activated carbon (Co0.83Ni0.17/AC) have been successfully fabricated by a simple thermal-treatment method. The resulting Co0.83Ni0.17/AC with a dominant alloy particle size of 45 nm exhibits a microporous and mesoporous structure with a surface area of 159.2 m2 g−1. As an electrocatalyst, the as-prepared Co0.83Ni0.17/AC demonstrates bifunctional electrocatalytic activity toward the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline media, delivering overpotentials of 193 and 325 mV at 10 mA cm−2, respectively. Importantly, it is found that the electrocatalytic oxidation of benzyl alcohol to benzoic acid on Co0.83Ni0.17/AC is more favourable than the OER process, with almost 224 mV less overpotential at 10 mA cm−2 and 96% faradaic efficiency at 1.425 V vs. RHE (passing charge amount of ∼40C). As a simultaneous anode and cathode electrocatalyst for water splitting, Co0.83Ni0.17/AC displays a H2 generation rate of 8.98 μmol min−1 in 1.0 M KOH solution containing 10 mM benzyl alcohol, almost 1.4 times that obtained by an OER-introduced water splitting system, with near 98% faradaic efficiency for H2. This work would be helpful to develop low-cost and abundant bifunctional electrocatalysts for electrocatalytic organic synthesis and simultaneously improving H2 generation from water splitting.
研究领域:
化学工程
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材料科学
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可再生能源
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 19
·2000613
·
IF 16.836
Yusen He,Mingjun Li,Yongguang Zhang,Zhenzhen Shan,Yan Zhao,Jingde Li,Guihua Liu,Chunyong Liang,Zhumabay Bakenov,Qiang Li
The main obstacles that hinder the development of efficient lithium sulfur (Li–S) batteries are the polysulfide shuttling effect in sulfur cathode and the uncontrollable growth of dendritic Li in the anode. An all-purpose flexible electrode that can be used both in sulfur cathode and Li metal anode is reported, and its application in wearable and portable storage electronic devices is demonstrated. The flexible electrode consists of a bimetallic CoNi nanoparticle-embedded porous conductive scaffold with multiple Co/Ni-N active sites (CoNi@PNCFs). Both experimental and theoretical analysis show that, when used as the cathode, the CoNi and Co/Ni-N active sites implanted on the porous CoNi@PNCFs significantly promote chemical immobilization toward soluble lithium polysulfides and their rapid conversion into insoluble Li 2 S, and therefore effectively mitigates the polysulfide shuttling effect. Additionally, a 3D matrix constructed with porous carbonous skeleton and multiple active centers successfully induces homogenous Li growth, realizing a dendrite-free Li metal anode. A Li–S battery assembled with S/CoNi@PNCFs cathode and Li/CoNi@PNCFs anode exhibits a high reversible specific capacity of 785 mAh g −1 and long cycle performance at 5 C (capacity fading rate of 0.016% over 1500 cycles).
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Shikun Hou,Ying Wang,Feng Gao,Hua Yang,Fei Jin,Li Ren,Qiong Wu,Hongliang Ge,Yahui Wang
This paper proposes a new and unprecedented strategy for designing efficient and ultra-light electromagnetic wave (EMW) absorbing materials. The strategy utilizes a nano-antenna arrays structure to capture EMW. Specifically, CoNi-layered double hydroxide (CoNi-LDH) nanoneedles are designed on the surface of carbon fiber cloth (CFC) using a solvothermal method, whereafter an in situ chemical oxidative polymerization process is employed to construct polyaniline (PANI) coating on these CoNi-LDH nanoneedles. The resultant composite, named PANI@CoNi-LDH@CFC, possesses the unique shell-core PANI@CoNi-LDH nano-antenna arrays and thus exhibits enhanced EMW absorption performance. The PANI@CoNi-LDH@CFC composite obtains an effective absorption bandwidth of 14.8 GHz (1.0–5.0 mm) and a minimum reflection loss of −57.6 dB. In particular, computer simulation technology confirms that the radar cross section values of PANI@CoNi-LDH@CFC are lower than −16.4 dBm 2 in the range of −60°<θ < 60°, indicating a high radar wave attenuation ability. This work pioneers the research on design of nano-antenna arrays structure to strengthen EMW capture and opens up a unique path for constructing high-performance EMW absorbing materials.
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Baojie Zhang,Junyue Qi,Juejia Tian,Yuqi Hao,Zishuai Wang,Chen Ma
Biomass-derived carbon materials have attracted considerable attention for electromagnetic wave (EMW) absorption owing to their sustainability, low cost, and porous structures. However, their practical application is often hindered by poor impedance matching and a single loss mechanism. In this study, a hierarchical heterostructure is constructed by introducing magnetic components to enhance the synergy between dielectric and magnetic losses while optimizing impedance matching. In particular, natural kapok fibers are utilized as a precursor to prepare hollow carbon microtubes (CMTs) via carbonization, and CoNi nanoparticles are controllably grown on the surface of these CMTs using a hydrothermal method, successfully fabricating CoNi/CMT composites. The incorporation of CoNi nanoparticles substantially enhances interfacial and dipole polarization as well as promotes natural and exchange resonance, thereby synergistically improving magnetic loss capabilities and establishing an integrated electromagnetic dissipation mechanism. The CoNi/CMT-4 sample exhibits outstanding EMW absorption performance, i.e., a minimum reflection loss (RL) of −50.36 dB and an effective absorption bandwidth of 5.04 GHz. Furthermore, within a thickness range of 1–5 mm, the material maintains RL values below −10 dB across the entire 4–18 GHz frequency range, demonstrating exceptional broadband EMW absorption performance and strong absorption characteristics. This study provides a new design strategy for developing high-performance biomass-derived carbon-based EMW absorbers.
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高影响因子
Sustainable Energy & Fuels
·
2020
·Vol. 5
·期 4
·963-972
·
IF 5.503
Sen-Wang Wang,Zhen-Hong He,Jian-Gang Chen,Kuan Wang,Zhong-Yu Wang,Pan-Pan Guo,Jie Lan,Weitao Wang,Zhao-Tie Liu
Hydrogenolysis of biomass-derived lignin sources is highly important for the conversion of renewable biomass resources to biofuels. However, lots of developed catalysts suffer from the drawbacks of expensive precious metal catalysts and/or operation under harsh conditions. In the present work, Co–Ni bimetallic catalysts were prepared and applied in catalyzing hydrogenolysis of Caryl–O aromatic ethers with high activities under the promotion of Nb2C MXene additive. Especially, the hydrogenolysis of diphenyl ether (DPE), a 4–O–5 model compound, to cyclohexane (cy) and cyclohexyl alcohol (cy-ol) could be achieved over the Co2Ni1Ox–Nb2C MXene catalytic system at 120 °C and under 5 bar of H2, which are mild conditions in comparison with those for the developed heterogeneous precious-metal-free catalysts. The excellent catalytic performances stemmed from the strong interaction between Co and Ni species and the promotion of Lewis acidic sites offered by Nb2C MXene. The proposed reaction pathway involved the direct hydrogenolysis of DPE route, in which DPE was initially hydrogenolyzed to benzene and phenol. They were further hydrogenated to cy and cy-ol. The present work not only develops a noble-metal-free bimetallic catalyst for utilization of biomass-derived lignin sources, but also provides a novel strategy for using the Nb2C MXene material.
研究领域:
催化化学
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能源材料科学
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生物质转化
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 40
·15354-15360
·
IF 4.569
Dandan Chu,Yan Wang,Dong Li,Xue-Qiang Chu,Danhua Ge,Xiaojun Chen
In this study, we fabricated a novel non-enzymatic glucose sensor based on prism-like bimetallic alkaline carboxylate (CoNi–MIM). The morphology and structure of CoNi–MIM were carefully investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), powder X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The electrochemical glucose oxidation of the synthesized sensor was then explored by cyclic voltammetry (CV) and chronoamperometry in alkaline medium. It was found that CoNi–MIM is the optimal choice with a remarkably high sensitivity of 5024.4 μA mM−1 cm−2, low detection limit of 56.1 nM (S/N = 3), linear response of up to 14.3 mM and excellent selectivity compared to Co-MIM, CoFe-MIM and CoMn-MIM. Furthermore, the as-fabricated sensor demonstrated appreciable practicality for the determination of glucose in real samples. These results indicate that CoNi–MIM holds a good application prospect in non-enzymatic glucose sensing.
研究领域:
分析化学
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材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Mei Wu,Xiaohui Liang,Shaoyang Pan,Hongchang Wang,Zengming Man
Molybdenum disulfide (MoS 2 ) has garnered significant attention as a promising electromagnetic wave absorber, owing to its distinctive layered structure composed of S-Mo-S slabs, weak van der Waals interlayer forces, high specific surface area, and tunable morphology. These inherent properties are particularly advantageous for mitigating electromagnetic interference in emerging technologies such as 5 G wireless communication and wearable electronic devices. The ion intercalation technique commonly used in energy catalysis is utilized to enhance the absorbing performance of MoS 2 by increasing the spacing between layers and insert CoNi alloy into its layer. The developed MoS 2 /CoNi heterojunction absorber effectively suppress alloy oxidation while regulating the electromagnetic parameters and impedance matching of the composite, leading to a significant improvement in absorption performance. The results prove that the prepared MoS 2 /CoNi heterostructures exhibit excellent comprehensive electromagnetic wave absorption performance. All samples exhibit the minimum reflection loss values lower than −50 dB, with the corresponding matching frequencies being at low frequencies. Excellent absorbing performance is inseparable from the improvement of material structure, and the modification of MoS 2 by ion intercalation is the key core to improve electromagnetic wave absorption performance. This discovery provides a promising alternative technique that utilizes two-dimensional materials to develop simple, customizable and low-cost absorbers.
研究领域:
材料科学
·
电磁干扰屏蔽
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纳米复合材料
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能源催化
·
二维材料
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Zichuan Lu,Shuai Li,Changhao Zhao,Jiaguang Zheng,Danhong Shang,Fuying Wu,Liuting Zhang
Herein, a novel approach by designing Schottky-structured CoNi nano-alloys were introduced. After compositing with MgH 2 , its initial hydrogen absorption started at a low temperature of 40 °C. At a temperature of 300 °C, 6.5 wt% of H 2 was released in only 10 min. Furthermore, the kinetic analysis revealed a pivotal transformation in the control model for dehydrogenation of MgH 2 , shifted from surface penetration to diffusion at a moderate temperature of 250 °C with the introduction of CoNi-CoO@rGO. After modification, the activation energy for hydrogen de/absorption decreased from 116 kJ/mol and 79.39 kJ/mol, to 66 kJ/mol and 54.39 kJ/mol, respectively. It is noteworthy that the CoNi-CoO@rGO-modified MgH 2 exhibited excellent cycling performance, retained an impressive hydrogen storage capacity of 97% after 20 cycles at 300 °C. The innovation of this work lies in the following three aspects: 1) the uniform distribution of CoNi-CoO@rGO nanoparticles on the surface of MgH 2 significantly enhanced the contact area and promoted the catalytic activity , 2) the synergistic effect between Mg 2 Co-Mg 2 CoH 5 and Mg 2 Ni-Mg 2 NiH 4 attenuate the intensity of the Mg-H bond and quickened the post-discharge of MgH 2 , 3) the incorporation of a CoO-induced Schottky structure accelerated the H transfer in MgH 2 and improved the hydrogen absorption and release efficiency.
研究领域:
材料科学
·
氢能
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纳米技术
·
催化
·
能量存储
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DOI
高影响因子
危险品化学品经营许可证（带存储）