Soft Science
·
2026
·Vol. 6
·期 3
·N
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IF 15.9
Kaiyan Luo,Yupeng Hu,TengZhou,Xiaonan Liu,Maoxia Lu,Zhi Lei,Daohai Zhang,Wei Gong
The rapid development of information technology has given rise to an urgent demand for high-efficiency electromagnetic wave absorbing materials. It is a challenge for wave-absorbing materials that address the electro-magnetic synergistic effect to develop high-efficiency electromagnetic wave (EMW) materials that can not only reduce the electromagnetic interference generated by electronic devices in daily use but also exhibit a certain degree of stealth in the military field. To study and prepare high-efficiency EMW materials, this paper uses the solvothermal method to prepare NiCo-HHTP, and systematically investigates their electromagnetic wave absorption performance and absorption mechanism. The research shows that the composite material NCH1 obtained in this experiment achieves a minimum reflection loss (RLmin) value of -56.99 dB and an effective absorption bandwidth of 6.51 GHz at a relatively thin matching thickness of 2.9 mm. The polarization effect endows it with good conductive loss, and the magnetic central metal gives it a certain degree of magnetic loss. The synergistic effect of dielectric loss and magnetic loss makes the material exhibit a good wave-absorbing effect. This simple and efficient preparation method provides a new strategy for the preparation and application of metal-organic framework materials in EMW absorption.
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Yuexin Liu,Yanzhong Wang,Huiqi Wang,Peihua Zhao,Hua Hou,Li Guo
Due to the large specific surface area and potential redox sites, metal organic frameworks (MOFs) are considered as a promising electrode material for supercapacitors . However, the low electrical conductivity of MOFs impedes their application in supercapacitors. Here, the NiCo-MOF/acetylene black composites were facily fabricated by an ultrasonic method, in which acetylene black was uniformly distributed between NiCo-MOF nanosheets and formed a conductive network, thus improving the electrical conductivity of NiCo-MOF as well as hindering their aggregation. The as-obtained NiCo-MOF/acetylene black composites exhibit high specific capacitance of 916.1 F g −1 , remarkable rate capability and cycling stability compare to the pure NiCo-MOF. In addition, an asymmetrical supercapacitor were also constructed, which achieved a maximum energy density of 33.84 Wh kg −1 at a power density of 750 W kg −1 and good cycling stability with 85.25% of initial capacitance after 5000 cycles.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Junjing Li,Yu Wang,Bin Zhao,Jing Ding,Jun Zhang,Menghua Yin,Zhaohui Zhang,Shumin Ma,Yaqian Liu,Zilin Tan,Hongwei Zhang,Liang Wang,Dionysios D. Dionysiou
In this work, a nickel-cobalt bimetallic organic framework (NiCo-MOF) was introduced as an intermediate layer to synthesize a Pd/NiCo-MOF/Nickel foam composite electrode, which was applied for electrocatalytic hydrodechlorination (ECH) of chlorinated pharmaceuticals and personal care products (PPCPs). The introduction of the NiCo-MOF structure dramatically improved the catalytic activity compared with the common Pd/Nickel foam electrode. Combined with transmission electron microscope and X-ray absorption fine structure analysis, catalyst on Pd/NiCo-MOF/Nickel foam surface had smaller particle size. The removal of the Pd/NiCo-MOF/Nickel foam electrode for chloramphenicol (CAP) reached more than 95 % at 40 min, while the removal of the Pd/Nickel foam electrode was only approximately 55 %. In this study, the active atomic hydrogen (H*) adsorbed on the Pd and NiCo-MOF structures is the critical active species to remove chlorinated PPCPs by Pd/NiCo-MOF/Nickel foam electrode. Density functional theory (DFT) was used to calculate and investigate the adsorption strength of the composite electrode structure for CAP, the product and H*. This work provided a new method to achieve higher catalytic performance and reactivity operability and longevity of catalytic materials through the synergism of a NiCo-MOF interlayer with Pd particles.
研究领域:
环境科学
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材料科学
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化学工程
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Russian Journal of Physical Chemistry A
·
2025
·Vol. 99
·期 11
·2797-2808
·
IF 0.8
Guangtao Gao,Jiang Zichao,Ma Kaiyue,Chen Qizhi,Liu Huijun
Metal-organic frameworks (MOFs) are widely used as electrode materials due to their porous structure. However, their low conductivity often limits their further development. To overcome the issue, NiCo bimetallic organic framework (NiCo-MOF) and Multiwall carbon nanotube (MWCNT) were attached to Nickel foam (NF) surface without any binder by a simple one-step hydrothermal synthesis, resulting in electrodes with a regular linear layered structure. The structure promoted the electron/ion conduction and exposed more redox active sites, significantly improving electrochemical performance. The electrode prepared with Ni : Co = 1 : 2 and 2% MWCNT exhibited an areal specific capacitance of 5.94 C at 5 mA cm –2 and the capacity retention rate of 83.1% after 5000 cycles at 15 mA cm –2 . The areal-specific capacitance of the modified electrode material increased by nearly 7 times from 0.87 C to 5.94 C cm –2 . Hybrid supercapacitors (HSCs) consisting of the obtained electrodes and activated carbon (AC) had energy density up to 770 mW h cm –2 at a power density of 5.63 W cm –2 .
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MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Ziwei Guo,Jingce Bi,Xiaoguang Sang,Jinxia Wang,Xia Zhang,Zhuopeng Wang,Yide Han
Bimetallic NiCo-MOFs were synthesized via a solvothermal method, possessing optimized morphology and more exposure of active sites. • Nickel-cobalt synergism endows NiCo-MOFs with superior glucose sensing performance compared with monometallic Ni-MOF. • The bimetallic NiCo 3 -MOF demonstrates exceptionally high sensitivity and a rapid response for glucose detection. By multi-metal doping method, the morphology of metal-organic frameworks (MOFs) could be regulated, leading to more exposed active sites and enhanced mass transfer for electrolyte, thereby significantly improving the electrocatalytic oxidation capacity of MOFs toward glucose molecules. This strategy offers a novel approach for designing high-performance nickel-based MOF non-enzymatic electrochemical glucose sensors. In this study, a series of bimetallic NiCo-MOFs were successfully synthesized via a one-pot solvothermal method, and the influence of varying metal ratios on sensor performance was systematically investigated. Electrochemical results demonstrate that bimetallic NiCo-MOFs exhibit superior catalytic activity compared with monometallic Ni-MOF. Among bimetallic NiCo-MOFs, NiCo 3 -MOF (Ni:Co = 1:3) displays the most outstanding sensing performance, achieving high sensitivities of 2048.55 μA·mM −1 ·cm −2 and 966.45 μA·mM −1 ·cm −2 in the linear ranges of 0–600 μM and 600–3000 μM, respectively. The detection limit (LOD, S/N = 3) is as low as 0.57 μM, with a rapid response time of only 1.8 s. In contrast, the monometallic Ni-MOF exhibits significantly lower sensitivities of 584.15 μA·mM −1 ·cm −2 and 414.58 μA·mM −1 ·cm −2 under identical conditions. This enhanced electrochemical performance is attributed to the synergic effect between cobalt and nickel active sites in MOFs and nanosheet-like architecture, resulting in increasing of the specific surface area and exposing more accessible active sites. Furthermore, bimetallic NiCo 3 -MOF demonstrates excellent current stability over a prolonged period of 3000 s. Selectivity tests confirm its strong resistance to common interfering species such as sodium chloride, potassium chloride, sucrose, lactose, uric acid, dopamine hydrochloride, and ascorbic acid, while reliable detection performance is maintained in bovine serum albumin samples. Therefore, bimetallic NiCo 3 -MOF holds significant promise for application in MOF-based electrochemical biosensors. Download: Download high-res image (65KB) Download: Download full-size image
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ChemCatChem
·
2025
·
IF 3.9
Manting Zhang,Chenggong Wang,Tingting Zhou,Yuqiao Wang,Gang Huang,Fengyan Han,Huaiyu Shao,Caiqin Wang
Developing efficient bifunctional electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) to improve the hydrogen production efficiency from water splitting is decisive. In this work, we developed an efficient strategy to obtain NiCoRux trimetal composite catalyst from NiCo-MOF heterojunction with nano-flower-like ZIF-67 growing on layered Ni-BDC. The unique dual-MOF heterointerface creates rich electrochemical surface to anchor ruthenium species; and the synergistic effect among multiple components (Ru, Ni and Co) in NiCoRux improved the catalytic performances in HER and OER processes. As a result, the as-obtained NiCoRu0.5 exhibited excellent catalytic activity and stability for HER and OER in alkaline media, specially presented the overpotential of 240 mV for OER at 20 mA cm-2. This work offers a feasible way to optimize the transition metal-based catalysts for improved electrocatalysis efficiency in overall water splitting.
研究领域:
材料科学
·
电化学
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CRYSTENGCOMM
·
2024
·
IF 2.6
Guoping Wang,lilei zhang,Tian Tang,Sen Liao
Designing metal-organic framework (MOF) materials with high conductivity is crucial for their application in energy storage devices. In this study, a simple process, namely, one-pot hydrothermal method was used for simultaneously synthesizing the composite of carbon quantum dots (CQD) and NiCo-MOF, and the effect of various carbon sources for CQD was compared. The results showed that it was very necessary to choose appropriate carbon source for obtaining NiCo-MOF with the expected lower Rs and Rct. Carbon sources significantly affected the morphology of NiCo-MOF, and in turn its specific surface area, pore volume and pore size. Particularly, after introducing CQD derived from citric acid, the electron cloud density around metal Co atom in NiCo-MOF composite became higher, improving electron transfer ability, activating the metal center Co and alleviating the polarization. As the result, the obtained NiCo-MOF-CA composite exhibited a capacitance of 1826.8 F g-1 at 1 A g-1, significantly higher than that of NiCo-MOF (1060.3 F g-1). An amplifying circuit model was proposed for explaining the phenomenon. Its cyclic performance also became better, but still left to be further improved. The simple synthesis process might be applied to preparing other similar composites. In addition, the conductivity of MOF was improved by introducing specific conductive additive to alter the electron structure of metal atom in active materials, providing an effective strategy for other researchers.
研究领域:
材料科学
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电化学
·
能量存储
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RSC Advances
·
2022
·Vol. 12
·期 52
·33716-33724
·
IF 4.036
Jie Hu,Lei Li,Hao Li,Ying Zhai,Fushun Tang,Zhe Zhang,Banglin Chen
The mixed bimetal metal–organic framework Ni0.37Co0.63-MOF-74 has been constructed by the solvothermal method for NO adsorption. The results showed that bimetal Ni0.37Co0.63-MOF-74 takes up NO with a capacity of up to 174.3 cc g−1 under ambient conditions, which is 16.3% higher than that of the best single metal Co-MOF-74. The IAST adsorption selectivity for a NO/CO2 binary mixture can reach a maximum of 710 at low adsorption partial pressure, while the regeneration performance can be retained even after five cyclic adsorption–desorption experiments. Its separation performance was further confirmed by breakthrough experiments, indicating this new bimetal Ni0.37Co0.63-MOF-74 as one of the best materials for NO adsorption and separation in flue gas.
研究领域:
材料科学
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环境科学
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2025
·
IF 4.9
Yazhou Liu,Jingwen Hu,Qiyong Zhu,Ping Yang,Yao Jiang,Xuezhi Zhang,Siying Wu
An innovative preparation approach was utilized to prepare bimetallic nanohybrid arrays of NiCo-LDH onto nickel foam through a hydrothermal technique. Then, 2,5-Dihydroxyterephthalic acid ligands were engaged to synthesize NiCo-MOF via a solvothermal method. Subsequently, an alkaline etching-induced technique transformed the bimetallic MOF back into LDH (designated as Et–NiCo-LDH), yielding a bimetallic hydroxide characterized by a denser nanohybrid array and a more abundant pore structure, thereby demonstrating exceptional specific capacitance. The resultant material exhibited a remarkable specific capacitance of 22.39 F cm −2 at a current density of 2 mA cm −2 (about 1194.16 F g −1 at 1 A g −1 .The loading capacity is 12 mg per square centimeter). After enduring 5000 galvanostatic charge-discharge cycles at a current density of 15 mA cm −2 , the material maintained 83.6 % of its initial capacity. Furthermore, when assembled into an asymmetric supercapacitor device with the as-synthesized Et–NiCo-LDH@NF composites serving as the positive electrode and activated carbon (AC) as the negative electrode, the device demonstrated an energy density of 671.42 Wh m −2 and a power density of 1399.99 W m −2 . Additionally, at a mass loading of 1 A g −1 , the energy density and power density were recorded as 45.04 Wh kg −1 and 350.37 W kg −1 , respectively, with a mass loading of 12 mg cm −2 . A capacity retention rate of 85.6 % was achieved after 5000 cycles. This study offers a straightforward method for producing uniform and dense bimetallic nanohybrid arrays tailored for applications in the capacitor field.
研究领域:
材料科学
·
电化学
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高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 43
·7650-7657
·
IF 3.545
Tingting Sun,Shuangyan Lin,Zhikun Xu,Lin Li
Two-dimensional (2D) metal–organic frameworks (MOFs) with highly exposed electro-active surface are regarded as promising oxygen evolution reaction (OER) electrocatalysts. This work demonstrates the in situ conversion of NiCo-LDH (LDH: double-layer hydroxide) into an Fe-doped NiCo-MOF on a conductive substrate (Fe-NiCo-MOF/NF) by a two-step hydrothermal method. The hierarchical book-like structure of the Fe-NiCo-MOF/NF electrode provides a large electro-active surface and improved electron transport capability, leading to enhanced oxygen evolution performance in an alkaline environment. Specifically, Fe-NiCo-MOF/NF needs an overpotential of 290 mV to drive a current density of 50 mA cm−2, which is 136 mV lower than that of the precursor NiCo-LDH. Additionally, its activity can be maintained for at least 20 h at a high current density of 200 mA cm−2. Moreover, the real active centers of the catalyst were discovered to be the metal oxides converted during the OER cycles. This work used a simple hydrothermal method to enhance the OER performance, which is convenient for direct application of MOF materials in electrocatalysis fields.
研究领域:
材料科学
·
电化学
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Gang Huang,Chenggong Wang,Danil Bukhvalov,Yingchun Yang,Jialu Gao,Fengyan Han,Xiaofei Yang,Caiqin Wang
Urea-assisted water electrolysis is a significant and sustainable strategy to optimize electrolyte system to promote the efficiency of hydrogen producing in overall water splitting. Here we construct excellent catalysts (NiCoRu-X) by introducing Ru into reduced dual metal-organic frameworks (MOFs) via a mild chemical reduction method, which preserves multi hetero-interfaces that are spontaneously formed. Interestingly, excellent performances in urea oxidation reaction (UOR) can be observed on all NiCoRu-X samples but without obvious difference in the activity, while the optimal catalyst can be distinguished by testing their catalytic activity in hydrogen evolution reaction (HER). Dependent density functional theory (DFT) calculations are applied to identify the potential activity sites of different heterostructure in NiCoRu-X, and reveal that the hetero-interface promotes the formation of dynamic Ni 3+ actives like NiOOH, which benefit for UOR. In the urea-assisted electrolytes, the reaction potential difference by coupling the LSV curves of HER and UOR is 155 mV lower than that in the electrolyte without urea at 20 mA cm −2 , and 70 mV lower than that in overall water splitting. It reaches a high faraday efficiency (FE) of 98.5 % at 2.0 V in urea-assistant water electrolysers, higher than that without urea assistant (92.9 %). This work highlights the possibility of using urea oxidation to decrease the reaction overpotential and to further improve the efficiency of producing hydrogen in overall water splitting by introducing urea in electrolyte system.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yujuan Cao,Ning Wu,Fan Yang,Meng Yang,Tingting Zhang,Hao Guo,Wu Yang
Due to the insufficient performance, it is still a challenge to combine conventionally synthesized metal-organic framework (MOF-74) with other materials to fabricate composite electrodes for high-performance supercapacitors . Herein, we synthesized a series of NiCo-MOF-74 composite materials with different amounts of polypyrrole nanotubes (T-PPy) denoted as NiCo-MOF-74/T-PPy-m (m = 2.5, 5, 10, 15 and 20) through in situ growth of the bimetallic MOF around the PPy nanotubes by a simple solvothermal method . By comparison, the NiCo-MOF-74(1)/T-PPy-10 composite, with a Ni/Co molar ratio of 1:1 obtained in the presence of 10 mg of T-PPy, possessed the highest specific capacitance of 849 C·g −1 at 1 A·g −1 and excellent cyclic stability with a capacitance retention rate of 90.0% after 10,000 cycles as well as good rate performance. Moreover, the assembled asymmetric supercapacitor respectively using NiCo-MOF-74(1)/T-PPy-10 and active carbon as positive electrode and negative electrode achieved a superior energy density of 58.4 Wh kg −1 at the power density of 747.6 W kg −1 and high cyclic lifespan (91.4% capacitance retention after 10,000 cycles). The mechanism of capacitance increase was studied in detail, influences of metal molar ratios, morphology and addition amounts of PPy on electrochemical performances of the formed composition materials were systematically discussed, and it was found that the interpenetrating network structure assembled by “string of candied haws”-like T-PPy-interweaved NiCo-MOF-74(1) polyhedrons possessed the best capacitive performance for enhanced conductivity of the resulted composite, improved dispersity of the bimetallic MOF and more exposed active sites. And the interwoven structure alleviated the stress change-induced structure or phase variation caused by repeated volumetric swelling and shrinking during charge/discharge cycle and enhanced the rate capability and cycling stability.
研究领域:
材料科学
·
电化学
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危险品化学品经营许可证（带存储）