CHEMOSPHERE
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2021
·
IF 7.086
Zhiruo Wu,Huimin Niu,Jinghuan Chen,Jianmeng Chen
The development of active transition-metal oxide (TMO) catalysts for the abatement of volatile organic compounds (VOCs) remains a great challenge. Controllable synthesis of TMOs with specific morphology and suitable composition is a promising way for acquiring efficient oxidation catalysts. Herein, a series of hierarchical Co 3 O 4 /CoNi-layered double oxides (CoNi-LDO) nanocages covered by interlaced nanosheets were synthesized using a cobalt metal-organic framework (Co-MOF)-based strategy. The textural properties, morphology, surface chemical state, and reducibility of the CoNi-LDO catalysts were systematically characterized by various techniques. The catalytic activity toward toluene oxidation and the stability performance was investigated. Results demonstrated that the morphology, composition, and textual properties can be controlled by tuning the post-synthetic etching reaction conditions. Benefiting from the structural and compositional merits, as well as the superior low-temperature reducibility, the CoNi-LDO-1 catalyst (Ni/Co molar ratio was 0.39) with core-shell structure exhibited excellent activity toward toluene oxidation. Our work offers a new strategy for the design of high-performance oxidation catalysts for the abatement of VOCs.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
M. Usman Tahir,Hina Arshad,Heng Zhang,Zhiyan Hou,Jide Wang,Chao Yang,Xintai Su
Single imidazolate framework-67 (ZIF-67) is commonly used as a template to prepare layered double hydroxides (LDHs) with specific morphology to improve the performance of materials. Herein, the Co 2+ ion in ZIF-67 is partially substituted by Ni 2+ to obtain the dodecahedron bimetallic imidazolate framework (CoNi-ZIF). Subsequently, using bimetallic CoNi-ZIF as the sacrificial template, CoNi-LDH hierarchical hollow cage structures with wrinkled nanosheet arrays are synthesized at room temperature and in aqueous solution by an inexpensive and environment friendly surfactant-free approach. The optimized etched CoNi-LDH4 has a maximum specific capacitance of 1877 F g −1 at a current density of 1 A g −1 , and cycling stability of 99.89% after 5000 cycles, which is significantly better than that of ZIF-67 derived CoNi-LDH67 (1357 F g −1 at 1 A g −1 , cycling stability of 73.35%). The asymmetric supercapacitor with CoNi-LDH4 as a cathode and activated carbon (AC) as anode has an energy density of 49.3 Wh kg −1 at 750 W kg −1 power output and stable cycling performance (capacity retention of 92.13% after 5000 cycles). This study shows the prospect of bimetallic CoNi-ZIF derived LDHs nanostructures prepared at room temperature and in aqueous solution to improve the performance and stability of supercapacitors.
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高影响因子
Small
·
2020
·Vol. 16
·期 8
·1907043
·
IF 11.459
Chun Li,Yanting Gao,Xifeng Xia,Junwu Zhu,Xin Wang,Yongsheng Fu
Conjugated coordination polymers (CPs) with designable and predictable structures have drawn tremendous attention in recent years. However, the poor electrical conductivity and low structural stability seriously restrict their practical applications in electronic devices. Herein, the rational design and synthesis of a hierarchically structured 2D bimetallic CoNi-hexaaminobenzene CPs derived from Co(OH) 2 are reported as an efficient oxygen evolution reaction (OER) self-supported electrode. The as-obtained electrode possesses high electrochemical surface area and intrinsic activity, exhibiting high electrochemical catalytic activity, favorable reaction kinetics performance, and strong durability compared with those of the powder catalysts. As a result, the electrode delivers low overpotential of 219 mV @ 10 mA cm −2 and Tafel slope of 42 mV dec −1 as well as 91.3% retention of current density after 24 h of reaction time. The results of density functional theory computations reveal that the synergistic effect of Co and Ni plays an important role in OER. This work not only presents a strategy to fabricate advanced self-supported electrodes with abundant and dense active sites, but also promotes the development of conjugated CPs for electrocatalysis.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 4
·H157
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IF 3.12
Dandan Xu,Qin Shi,Xiaozhe Song,Hui Wang,Zhaoyong Bian
As a binder for the stabilization and dispersion of CoNi nanoparticles (NPs), ionic liquids (IL) were designed to connect inorganic anion on IL-functionalized reduced graphene oxide (rGO) and metal cation. The CoNi/IL-rGO described excellent oxygen reduction reaction (ORR) and the selective adsorption of bimetallic CoNi for chlorophene hydrodechlorination (HDC). The prepared electrocatalyst was characterized by SEM, TEM, XPS, Raman spectroscopy, XRD, and UV–vis spectroscopy. Results indicated that ILs could be functionalized by π–π stacking on the rGO surface. The optimal bimetallic CoNi NPs (Co-to-Ni weight ratio of 2.5:2.5) with small particles sizes (3.33 ± 0.03 nm) were uniformly dispersed on the surface of IL-rGO (mass ratio of IL:GO was 2:1) among a series of as-prepared catalysts. The IL on the rGO surface could prevent rGO agglomeration and provide sufficient binding sites to anchor the CoNi NPs via electrostatic interaction. Co(2.5)Ni(2.5)/IL(2)-rGO demonstrated low impedance (7.5 Ω) and diffusion resistance due to the introduction of IL. Co(2.5)Ni(2.5)/IL(2)-rGO exhibited a high peak current (−0.35 mA), preferred two-electron selectivity and high H2O2 productivity (>80%) toward ORR in an alkaline solution. The possible dechlorination mechanism of chlorophene was ascribed to the combination of adsorbed hydrogen on Co and adsorbed chlorophene on Ni.
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CARBON
·
2024
·
IF 10.5
Yanzhi Cai,Yalong Chai,Laifei Cheng,Siyu Guo,Yibing Yuan,Xue Huang,Zixuan Yu,Mingxing Chen,Shaoxiong Ren,Hudie Yuan
Constructing multi-level multi-scale heterogeneous interfaces in magnetic carbon-based composites remains a formidable challenge, requiring rational material combinations to effectively balance dielectric and magnetic losses for achieving high strength and wide frequency wave absorption. Electromagnetic wave (EMW) absorbing materials consisted of cobalt-nickel (CoNi) magnetic nanochain, nitrogen-doped carbon nanotubes (NCNTs) and hollow carbon microspheres were prepared by hydrothermal method without external magnetic field . These composites possessed a unique multi-level multi-scale heterogeneous interface structure that is highly advantageous for efficient absorption of EMWs. The CoNi nanoparticles were self-assembled into uniformly distributed and randomly oriented magnetic nanochains, which were further reassembled with NCNTs and hollow carbon microspheres to form heterogeneous interface structures resembling a rose, chrysanthemum, hedgehog ball, and bauhinia tree. Due to the high-density interface enhancing the loss ability of interface polarization, as well as the higher saturation magnetization , coercivity , and wave absorption ability of the magnetic nanochains compared to the magnetic nanoparticles themselves, the minimum reflection loss achieved is −66.86 dB, and the effective absorption bandwidth achieved is 5.01 GHz, at a content as low as 11 wt%. This study provides a new idea for generating nanochains without magnetic fields and constructing multi-level and multi-scale heterogeneous interface structures to achieve strong absorption and wide effective absorption bandwidth (EAB).
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Guangyao Hou,Xin Jia,Hongjun Kang,Xianshu Qiao,Yang Liu,Yang Li,Xiaohong Wu,Wei Qin
ABSTRACT Developing efficient and stable OER catalysts is conducive to improving hydrogen production efficiency and achieving “carbon neutrality” goal. Herein, a CoNi nano-alloys modified yolk-shell carbon cage (CoNi/NC-YS) catalyst was synthesized through a green synthesis method, which shows an outstanding OER activity with a low overpotential of 292 mV at 10 mA·cm −2 , and a robust OER catalytic stability. The experimental and density functional theory (DFT) results demonstrate that the hydrophilic yolk-shell CoNi/NC-YS catalyst with large specific area contributes to exposing more active sites, and increases the reaction contact area between catalysts and electrolyte. Meanwhile, CoNi nano-alloys can regulate the electronic configuration of CoNi/NC-YS catalyst and optimize Gibbs free energies for water adsorption, accelerating OER process in alkaline media and showing an outstanding OER performance. This work can provide a low-cost and green strategy to construct nano-alloys modified yolk-shell OER catalysts for renewable energy systems.
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高影响因子
POLYMER
·
2025
·
IF 4.5
Tianyi Ma,Lijing Han,Gaofei Zheng,Mingyu Wang,Junjia Bian,Yan Zhao,Hongwei Pan,Huiliang Zhang
In this work, we reported the first synthesis of an organic-inorganic hybrid flame retardant (PAPP@CoNi-LDH). This was achieved through the electrostatic self-assembly of piperazine pyrophosphate (PAPP) and cobalt–nickel layered double hydroxide (CoNi-LDH). Compared to PLA/5 wt% PAPP, the PLA/4.5 wt% PAPP/0.5 wt% PAPP@CoNi-LDH composite (FRPLA-0.5) achieved a superior Underwriters Laboratories Vertical Burning Test rating (UL-94, from V-2 to V-0) and higher Limiting Oxygen Index (LOI, from 22.5 % to 28.0 %), demonstrating the exceptional flame-retardant efficiency of PAPP@CoNi-LDH at minimal loading. Furthermore, the superior char-catalyzing capability reduced the peak heat release rate of FRPLA-0.5 from 556 to 490 kW/m 2 versus pure PLA. Moreover, uniaxial pre-stretching was applied to fabricate flame-retardant PLA composites with superior mechanical properties. For FRPLA-0.5 subjected to 2.0 × pre-stretching (pre-stretching ratio = 2.0), tensile strength surged from 54.7 MPa to 96.6 MPa, elongation at break increased from 6.1 % to 63.7 %, and impact strength rose remarkably from 0.7 kJ/m 2 to 87.2 kJ/m 2 . This dual-strategy design achieved high-performance PLA composites with simultaneously enhanced fire safety and mechanical robustness.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zhiru Yang,Zi Yang,Wentao Hou,Hai Zhou,Hao He,Chao Jin
Three-dimensional S-CN/NC/CNTs network composites were synthesized via a combined hydrothermal and high-temperature treatment strategy. And their electrochemical behavior as supercapacitor electrodes was investigated. Compared with conventional synthesis routes, this method provides distinct advantages. Cobalt and nickel nanoparticles catalyze the directional growth of carbon nanotubes (CNTs) from melamine, forming a uniform coating structure that significantly enhances the electrical conductivity of the electrode. Concurrently, the sulfidation of cobalt and nickel nanoparticles dispersed within the nitrogen-doped carbon (NC) matrix and CNT network generates abundant redox-active sites, thereby improving the specific capacitance. Within this composite, Co-Ni-S functions as the electrochemically active phase, NC serves as the structural scaffold, and CNTs form an interconnected three-dimensional conductive framework that facilitates efficient electron transport. The synergistic interaction among these components endows the material with superior electrochemical performance. The optimized composite exhibits a high specific capacitance of 2104 F g⁻¹ at 0.5 A g⁻¹ in 6 M KOH electrolyte. Furthermore, a flexible quasi-solid-state supercapacitor assembled using this material as the positive electrode, activated carbon as the negative electrode, and a gel polymer electrolyte achieves an energy density of 40.3 Wh kg⁻¹ at a power density of 750 W kg⁻¹ , maintaining 87.6 % capacitance retention after 5000 cycles at 10 A g⁻¹ with excellent mechanical flexibility. This study presents an effective route for enhancing the electrochemical performance of three-dimensional composite electrodes through hierarchical conductive network design and controlled active-site dispersion, offering valuable insights for the development of high-performance energy storage materials.
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RARE METALS
·
2025
·
IF 11
Jiang Bo,Long Bo,Si Chen,Li Qing-Guo,Zhang Chao,Ma Jin-Cheng,Zhuang Ya-Ming,Yang Ya-Ke,Lin Si-Yi,Li Yun-Yun
Although carbon fiber electromagnetic wave absorbing materials have shown great potential in the field of electromagnetic protection, the currently reported carbon fiber-based absorbers are limited to the manipulation of composition and external structure, lacking the design of intrinsic morphology. To fill the above-mentioned gap, this work presents a spiral carbon fiber compounded with CoNi magnetic nanoparticles (CoNi@SCF). Attributed to its special morphology and dielectric-magnetic synergy, this material offers abundant attenuation mechanisms, demonstrating strong absorption at multiple frequencies with broadband application potential. In particular, the maximum reflection loss and effective absorption bandwidth of CoNi@SCF reach −66.5 dB at 2.9 mm and 6.6 GHz at 2.1 mm, respectively, and the maximum RCS reduction value of 41.5 dB m 2 also confirms the actual efficiency. In addition, gelation and hydrophobic modification experiments have been explored to meet the requirements for the employment of magnetic carbon fibers in practical scenarios. Therefore, this work may provide new inspiration for the design and manufacture of novel magnetic carbon fiber absorbers with great stability and multiband absorption performance. Graphical abstract
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高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Sohail Mumtaz,Muhammad Imran,Amir Muhammad Afzal
In this study, we develop photoresponsive heterogeneous Cobalt-nickel-based MOFs (CoNi-MOFs), cobalt dioxide (CoO 2 ), and tungsten diselenide (WSe 2 ) hybrid device to improve the performance of photo-assisted supercapacitors. We measure the electrochemical characteristics of photo-assisted hybrid electrodes under both dark and light conditions using cyclic voltammetry and galvanostatic charge–discharge. In dark, a high specific capacity (Qs) is estimated at 970 C/g, increased to 1230 C/g under the light in three-electrode assemblies. An FTO/CoNi-MOF@CoO 2 @WSe 2 /Electrolytes//PANI@AC/GS photo hybrid supercapacitors device is designed and measured in both conditions. The hybrid device showed Qs of 325 C/g in light conditions with energy and power densities of 72 Wh/kg and 827 W/kg, respectively. Even after undergoing 6000 cycles, it exhibited a capacity retention (CR) rate of 91 % and columbic efficiency of 93 %, indicating its exceptional durability as an energy storage device. Besides, the composite devices detect zearalenone in agricultural food samples. The optimal signal for Zearalenone in phosphate buffer solution was observed at pH 7.0, yielding the highest detected response. The sensor demonstrated a broad linear dynamic range of 1–300 μM and an impressively low detection limit of 0.5 nM for Zearalenone concentration. The CoNi-MOF@CoO 2 @WSe 2 nanocomposite has a remarkable sensitivity value of 110.72 mA/cm −2 /mM −1 and response against zearalenone in light. The findings also suggest that the capacitance of the CoNi-MOF@CoO 2 @WSe 2 electrode may increase at an optimal temperature. This likely occurs due to enhanced ion diffusion and charge transfer kinetics, which can improve the energy storage device’s efficiency and aid in identifying the cancerous part of the body.
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CARBON
·
2025
·
IF 11.6
Jiang Guo,Yukun Sun,Luo Kong,Feilong Jian,Wenling Wu,Jianfeng Zhu
The development of lightweight, multi-functional, broadband and high-efficiency electromagnetic wave absorption (EWA) materials remains a major challenge at present. In this work, chitosan-derived N-doped magnetic CoNi-decorated carbon aerogels were successfully fabricated by directional freezing and subsequent carbonization process. The constructed directional porous structure and the CoNi-decorated N-doped carbon hetero-interface optimize the impedance matching by regulating polarization, conductivity and magnetic loss. This is achieved by precisely controlling the degree of graphitization and the loading amount of CoNi alloy particles. Meanwhile, the directional porous framework is benefit for improving multiple reflections and scattering of electromagnetic wave. Remarkably, the fabricated N-Doped carbon aerogels decorated with CoNi alloy particles (CsCN-2) displays optimal EWA performance at low density (0.067 g/cm 3 ) with a minimum reflection loss (RL min ) value of -58.81 dB at 12.80 GHz, and a broad effective absorption bandwidth (EAB) could reach 6.96 GHz with thickness of only 3.09 mm. Moreover, when the thickness is reduced to 2.85 mm, the maximum EAB can expand to 7.52 GHz (from 10.48 GHz to 18 GHz). In addition, the CsCN-2 carbon aerogels also achieve excellent CST simulation results and outstanding thermal insulation. This work presents a novel insight for designing multifunctional carbon aerogels with high-performance of EWA.
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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.
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