MATERIALS & DESIGN
·
2026
·
IF 8.2
Yunxuan Huang,Xing Gong,Guotao Liang,Yanfeng Li,Kaiming Wang,Liping Yan,Huacheng Zhu,Yang Yang,Yanping Zhou
Microwave surpasses conventional heating in boosting dielectric loss of CoNi@C. • Magnetic loss contributes negligibly to the total microwave loss of CoNi@C. • GA|NLLS analysis unveils dominant role of electron injection from CoNi to C. • CoNi@C-based M 1 -D-M 2 absorber achieves 7.7–18.0 GHz bandwidth up to 60°. Developing microwave absorbing materials that integrate a wide effective absorption bandwidth (EAB) with superior angular and polarization stability is a key research direction in the field. In particular, MOF derived magnetic metal/carbon composites (MMOF-MM/C) that integrate both magnetic and electric loss mechanisms, have attracted widespread attention. To date, the role of the high content of magnetic metal in MMOF-MM/C for microwave absorption awaits systematic investigation. In this work, a microwave-assisted fast calcination strategy was proposed to synthesize well-dispersed, welded, homogenous CoNi@C-MW micro/nano hierarchical structure. Analysis of impedance matching ratios and attenuation constants reveals that the permeability of CoNi@C-MW contributes only minimally to microwave absorption in the 2.0–18.0 GHz frequency range. GA|NLLS fitting shows that CoNi metal enhances conduction and polarization losses in CoNi@C-MW, increasing polarization loss by nearly 50 % and conduction loss by up to three times. This is attributed to thicker, more graphitized carbon layers that facilitate electron injection from CoNi to carbon, and a well-dispersed, uniform particle structure that promotes heterogeneous interface polarization. Furthermore, a magnetic-dielectric-magnetic (M 1 –D–M 2 ) sandwich-structured absorber was further constructed, delivering an EAB covering 7.7–18.0 GHz at an angular stability up to 60° under both TE and TM polarizations. Download: Download high-res image (211KB) Download: Download full-size image
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 20
·9873-9881
·
IF 8.867
Mingyu Tong,Shengwen Liu,Xian Zhang,Tianxing Wu,Haimin Zhang,Guozhong Wang,Yunxia Zhang,Xiaoguang Zhu,Huijun Zhao
Due to their controllable morphologies, tunable porous structures, diverse compositions and easy fabrication, metal–organic frameworks (MOFs) are an ideal class of precursor material to develop high performance carbon-based materials for energy applications. In this work, two-dimensional (2D) Co/Ni MOFs nanosheets with a molar ratio of Co2+ to Ni2+ of 1 : 1 were first synthesized at room temperature using thiophene-2,5-dicarboxylate (Tdc) and 4,4′-bipyridine (4,4′-Bpy) as organic linkers. As a precursor material, the as-synthesized 2D Co/Ni MOFs nanosheets were further pyrolized at 550 °C in N2 atmosphere to incorporate 2D CoNi alloy nanoparticles into S, N-doped carbon nanosheets (CoNi@SNC) with a surface area of 224 m2 g−1, a porous structure, and good conductivity. Interestingly, it was found that the 2D Co/Ni MOFs nanosheets can be directly used as electrode materials for supercapacitors, delivering a specific capacitance of 312 F g−1 at 1 A g−1, whereas CoNi@SNC derived from its MOFs precursor as an electrode material for supercapacitors exhibits a much higher specific capacitance (1970, 1897 and 1730 F g−1 at 1, 2, 5 A g−1, respectively) with long cycling life (retaining 95.1% of the value at 10 A g−1 after 3000 cycles) and excellent rate capability at a high charge/discharge current. Further, an asymmetric supercapacitor device was constructed with CoNi@SNC as the positive electrode and active carbon as the negative electrode, exhibiting an energy density of 55.7 W h kg−1 at a power density of 0.8 kW kg−1 with lifetime stability up to 4000 charge–discharge cycles (capacitance retention of ∼90.6%). The results demonstrate that electrochemical activation-generated CoNi oxides/oxyhydroxides on the surface of the CoNi alloy nanoparticles in alkaline electrolyte during electrochemical measurements are the electrochemical active species of the CoNi@SNC-constructed supercapacitor. Additionally, the high performance of the CoNi@SNC-constructed supercapacitor can be collectively attributed to its relatively high surface area, which is favourable for the exposure of electrochemical active sites; its porous structure, which promotes redox-related mass transport; and the combination of CoNi alloy nanoparticles with graphitic carbon, which functions as an electron collector to improve electron transfer.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Kai Zhang,Qingmei Su,Bin Han,Yvjie Lv,Weihao Shi,Yongle Wang,Pinpin Wang,Zhiyong Wang,Wenqi Zhao,Miao Zhang,Shukai Ding,Shufang Ma,Gaohui Du,Rui Ye,Bingshe Xu
Designing highly efficient nonprecious metal electrocatalyst for the hydrogen evolution reaction (HER) in seawater electrolyte, particularly under ultra-high current density conditions, remains a formidable challenge. In this study, we successfully synthesized a crystalline/amorphous heterostructured CoNi/MoO 3-x electrocatalyst through a facile hydrothermal method followed by a calcination-reduction process. The as-prepared CoNi/MoO 3-x catalyst exhibited remarkable HER catalytic performance in both alkaline water and seawater electrolytes. Notably, the catalyst achieved impressively low overpotentials of 343 mV in 1 M KOH aqueous solution and 294 mV in alkaline natural seawater electrolyte at an ultra-high current density of 4000 mA/cm 2 . Furthermore, the CoNi/MoO 3-x electrocatalyst demonstrated outstanding long-term stability, maintaining robust performance at current densities of 3000 and 2000 mA/cm 2 . Density functional theory calculations revealed that the synergetic effect between crystalline CoNi and amorphous MoO 3-x accelerates water dissociation kinetics and optimizes hydrogen adsorption. These findings not only provide a promising strategy for developing cost-effective, nonprecious metal electrocatalysts with superior HER performance at ampere-level current densities, particularly for seawater splitting applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2025
·
IF 12.1
Jinbo Ming,Fengyun Wang,Zhen Liu,Guanyu Chen,Mengqiu Huang,Chongyun Liang,Wenbin You,Zhengchen Wu,Lei Wang,Renchao Che
Gradient materials and hierarchical structures exhibit remarkable diversity and integrity in nature. Currently, carbon-based aerogel can explore 1D/2D hierarchical structures brought by magnetic particles, but they are limited in the fabrication of 3D gradient and magnetized functional aerogel. Herein, a 1D anisotropic CoNi alloy chain is first found to convert randomly porous structure into special gradient and layered configurations. With optimized structural reorganization, multidimensional magnetic coupling and continuous electron transport pathways are successfully formed in this 3D hierarchical magnetized aerogel. Through collaborative regulation of the CoNi chain distribution and heterointerface structure, magneto-dielectric balance is precisely tuned to improve the impedance matching and ultra-frequency response ability toward to incident electromagnetic (EM) wave. Meanwhile, the correlation between interfacial polarization and coupling behavior induced by the magnetic chain is established through the density-functional theory (DFT) calculations and advanced visualized electron holography (EH) technology. Therefore, 3D layered and gradient carbon aerogel architected by 1D CoNi chain exhibited exceptional broadband absorption with the efficient absorption bandwidth up to 6.88 GHz at 2.1 mm thickness. These findings offer a new sight for designing high-performance gradient EM wave absorption with hierarchical structures regulated by unique 1D anisotropic magnetic alloy chain.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yuehong Xie,Chao Feng,Yuan Guo,Shiang Li,Cheng Guo,Yi Zhang,Jide Wang
This paper introduces a facile strategy to fabricate trifunctional electocatalysts through one pool treatment on MOFs to obtain carbon nanotube coated ultrafine CoNi alloy (CoNi@NCNTs) nanocomposites with N-doped rich-defect and abundant cavity structure. During the pyrolysis process, volatile CNx species from dicyandiamide were trapped by ZIF-67@Ni-ZIF nanosheets, simultaneously introducing nitrogen atom into carbon matrix to achieve the rich-defect porous nanotubes and abundant cavity structure. The as-prepared nanomaterials can simultaneously boost the ORR, OER and HER catalytic activity with strong durability. Significantly, the CoNi@NCNTs-700 exhibits excellent electrocatalytic activity including half-wave potential (E ORR, 1/2 ) of 0.80 V, lower operating voltage (E OER, 10 ) of 1.60 V at 10 mA cm −2 and potential difference (ΔE) of 0.80 V between E OER, 10 to E ORR, 1/2 in 0.1 M KOH, and low overpotential (E HER, 10 ) of −0.130 V reaching 10 mA cm −2 in acidic medium. The remarkable activity is ascribed to defect-rich porous carbon nanotubes structure and the synergistic effect between CoNi alloy nanoparticles, N-dope carbon and CoNi-Nx. And hollow structure facilitates to improve conductivity and stability. This work offers a useful archetypical template to design and construct efficient and stable trifunctional electrocatalysts, illustrating its viability for practical applications of energy conversion and storage devices.
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Kuang Sheng,Qingfeng Yi,A-Ling Chen,Yuebing Wang,Yuhui Yan,Huidong Nie,Xiulin Zhou
Searching for high-quality air electrode catalysts is the long-term goal for the practical application of Zn–air batteries. Here, a series of coexistent composite materials (CoNi/NHCS-TUC-x) of cobalt–nickel supported on nitrogen-doped hollow spherical carbon and tubular carbon are obtained using a simple pyrolysis strategy. Co and Ni in the composites are mainly present in the form of alloy nanoparticles, M–Nx and M–Cx (M = Co or Ni) species, with high oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) electroactivity. The materials containing different proportions of spherical carbon and tubular carbon obtained by simply adjusting the raw materials for generating tubular carbon exhibit interesting bifunctional performance: samples with an abundant tubular content have the highest ORR onset potential (0.91 V vs reversible hydrogen electrode), while those with a rich spherical content have the highest ORR current density (5.13 mA·cm–2). Furthermore, CoNi/NHCS-TUC-3 provides the lowest potential difference (ΔE = Ej=10 – E1/2) of 0.806 V. We then test the potential possibility of CoNi/NHCS-TUC-3 as an air electrode for primary and rechargeable Zn–air batteries. The primary battery delivers an open-circuit potential of 1.59 V, a peak power density of 361.8 mA·cm–2, and a specific capacity of 756.5 mA h·gZn–1. The rechargeable battery could be cycled stably for more than 55 h at 10 mA·cm–2. These characteristics make CoNi/NHCS-TUC-3 a superior electrocatalyst for both the ORR and OER, as well as a suitable bifunctional electrode applied to a rechargeable Zn–air battery.
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Gaoqiang Yu,Mingquan Ye,Aijun Han,Qingzhong Liu,Yaojing Su,Cheng Chen
Developing composite materials with a rational composition structure has been a critical strategy to obtain superior electromagnetic (EM) wave absorption materials. CoNi/MoSe 2 composites were synthesized by a two-step method in this work. Firstly, the flower-like MoSe 2 was synthesized by hydrothermal method , and then the CoNi alloy was loaded on the MoSe 2 surface by an electroless plating method. It is worth noting that in this paper, PdCl 2 was not used for activation during the electroless plating process, and the flower-like structure of MoSe 2 was not destroyed. In order to investigate the effect of different Co/Ni molar ratios on the absorption performance of the CoNi/MoSe 2 composites, three samples with Co to Ni molar ratios of 1:3, 1:1, 3:1 and two other samples with only one metal (Ni or Co) were prepared. The analysis results show that the minimum reflection loss(RL) value of Ni/MoSe 2 is −18.01 dB and the maximum effective absorption bandwidth(EAB) of Co/MoSe 2 is 2.16 GHz. In comparison, the CoNi/MoSe 2 composite exhibits the best EM wave absorption performance when the Co/Ni ratio is 1:3, and the minimum RL can reach −48.6 dB at a matching thickness of only 1.8 mm. And when the matching thickness is 1.4 mm, the broadest EAB is 3.76 GHz. Therefore, this work provides a new research idea for the design of broadband and efficient EM wave absorbers.
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Jingqiu Li,Yuming Xie,Mengjue Cao,Yi Feng,Jianfeng Yao
The metal ion etching induced transformation of zeolitic imidazolate frameworks (ZIFs) to layered double hydroxides (LDHs) is closely related to the etching conditions. Here, by tuning the Ni 2+ etching conditions (e.g., initial Ni 2+ concentration and etching time), Co-ZIF-L templated CoNi-LDH with diverse morphologies and tailorable compositions are obtained and their resultant electrochemical properties are optimized. Mechanism study reveals that the etching conditions significantly affect the disassembling rate of Co-ZIF-L as well as the formation rate of CoNi-LDH, leading to the morphological and compositional variance of etched samples, which further results in their distinct electrochemical activities. The resultant asymmetric supercapacitor assembled with Co-ZIF-L derived CoNi-LDH and activated carbon can achieve a maximum energy density of 77.3 Wh/kg at a power density of 700 W/kg with the capacity retention of 85.7 % after 2000 cycles, superior or comparable to other advanced CoNi-LDH based supercapacitors .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
·
2023
·
IF 4.6
Xin Yu,Xiaoyi Huang,Wenlong Jia,Jiahong Chen,Shibo Yang,Lincai Peng,Yong Sun,Xing Tang,Xianhai Zeng,Shuliang Yang,Zheng Li,Feng Xu,Lu Lin
Developing active and affordable catalysts for the transformation of biomass platform into value-added chemicals have drawn tremendous attention. Herein, we have successfully prepared a CoNi bimetallic nitrogen-doped carbon nanotubes (CNTs) catalyst, manifesting outstanding catalytic performance for furfural oxidative esterification under base-free conditions (methyl furoate yield >99%), and great recyclability (5th recycle). Importantly, an impressive methyl furoate formation rate of around 1980 μmol methyl furoate ·g cat −1 ·h −1 was achieved, to the best of our knowledge, the result represents one of the highest methyl furoate formation rates. The results revealed that the doping of Ni into the Co x Ni y -CNTs catalyst brings about more active sites. Fourier transforms infrared spectrometer results suggest that the Ni-N x sites are responsible for the adsorption of the substrate with tilted or vertical adsorption. Furthermore, the introduction of Ni facilitates the improvement of basicity, which in turn promotes the β-hydride elimination. All of these active sites boost the overall activity of the catalyst for the oxidative esterification of furfural.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2019
·Vol. 19
·期 12
·7790-7798
·
IF 1.093
Wei Liguo,Chen Wei,Jia Chenyang,Wang Dong,Li Ming,Dong Yongli,Song Weina,Liu Lilai,Yang Yulin
In this paper, CoNi bimetallic nanoparticle decorated reduced graphene oxide (CoNi-RGO) was synthesized by a facile hydrothermal method. When applied this CoNi-RGO into counter electrode for dye-sensitized solar cells (DSSCs), it shows smaller charge-transfer resistance and better electrocatalytic
activity than that of pure reduced graphene oxide (RGO). At the optimized conditions, the energy conversion efficiency of DSSCs based on CoNi-RGO counter electrode was 3.79%, indicating a higher photovoltaic performance of DSSCs based on CoNi-RGO counter electrode than that of DSSCs based
on RGO counter electrode (1.37%), and comparable to the value of DSSCs based on Pt counter electrode as a reference (4.95%). Additionally, the photovoltaic performance of DSSCs based on CoNi-RGO counter electrode strongly depends on its composition. The molar ratio of Co/Ni and the weight
ratio of CoNi/GO that used to prepare CoNi-RGO counter electrode are key factors to affect the performance of their cell devices. When both the molar ratio of Co/Ni and the weight ratio of CoNi/GO are 1:1, the CoNi-RGO counter electrode shows the best performance, indicating the potential
of such bimetallic nanoparticle decorated RGO as low-cost and efficient counter electrode to replace noble metal Pt counter electrode for the practical application of DSSCs devices.
✓ 已验证
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 7
·3021-3027
·
IF 3.288
Min-Jie Chen,Dai-Xue Zhang,Dan Li,Shan-Chao Ke,Xiao-Chen Ma,Gang-Gang Chang,Jian Chen,Xiao-Yu Yang
Highly efficient and stable supported non-noble metal catalysts to realize the real-time evolution of hydrogen for the promising substitution of fossil fuels are urgently desired but are still greatly challenging to achieve. In this work, a highly dispersed ultrafine CoNi nanoalloy has been successfully enclosed within a hierarchically porous carbon which exhibits a unique core–shell metal@carbon structure through an in situ carbonized reduction approach by using bimetallic CoNi-MOF-74 as a self-sacrificed template. Note that the all-around interactions between the nanoalloy and carbon within such a unique hierarchically porous core–shell can effectively stabilize and activate the CoNi nanoalloy, meanwhile facilitating the fast mass transfer of substrate molecules. We found that the Co/Ni ratio of the original precursors of MOF-74 and the pyrolysis temperature can significantly meditate the catalytic performance of the derived composite catalysts. In particular, the synthesized catalyst, 10%-CoNi/HPC-400, showed the best catalytic activity and good stability for hydrogen evolution with a turnover frequency value (TOF) of 27.22 min−1 at 323 K, which is higher than most reported non-noble metal catalysts and even some noble metal catalysts. The outstanding catalytic performance and durability of the composite catalysts were attributed to the synergic effect of the well-dispersed CoNi alloy and the unique hierarchical core–shell structure, which demonstrated the huge potential for AB hydrolysis in hydrogen storage applications.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yu Zhou,Xinyu Song,Shenggang Yan,Chunhua Ni,Li Xu,Liangmin Yu,Xia Li
Biomass-derived carbon has attracted extensive attention because of its unique form, wide range of sources and low cost. However, the construction of efficient biomass-based microwave absorbers with hierarchical structures and multicomponent magnetic/dielectric structures remains a great challenge. Therefore, CoNi-MOF was self-assembled in situ on the plant Juncus effusus by the microwave method, and CoNi/NC/C composites were prepared by in situ pyrolysis in a nitrogen atmosphere. The morphology, electromagnetic parameters, specific surface area and porous structure of the composites were adjusted by controlling the pyrolysis temperature. For a pyrolysis temperature of 600 ℃ and filling of 16 wt%, the composite was found to show an RL min value of − 64.3 dB at 12.88 GHz at a thickness of 2.5 mm, and the effective absorption bandwidth (EAB)reached 7.36 GHz. The excellent microwave absorption performance was attributed to conduction loss, dipole polarization, interface polarization, magnetic loss and balanced impedance matching.
✓ 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）