JOURNAL OF CATALYSIS
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2021
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IF 7.92
Huiyuan Cheng,Zihao Fan,Xuemei Wu,Manman Feng,Wentao Zheng,Guangping Lei,Xiangcun Li,Fujun Cui,Gaohong He
Single-atom catalysts (SACs) with well-defined active sites provide an efficient route for catalyzing CO 2 reduction reaction (CO 2 RR). Although enormous attention has been focused on metal-N x moieties, understanding the effect of metal-C coordination and engineering of the hybrid metal-N/C sites have rarely been reported. Herein, we fabricated Co SACs with tunable isolated Co-N 5-x C x ( x = 1, 2, 3) sites supported on porous carbon frameworks. Benefiting from the difference in electronegativity of the coordinated N and C atoms, the CO Faradaic efficiency (FE CO ) enhanced considerably from 54% to 76% and 92% at −0.8 V vs . RHE for Co-N 4 C 1 , Co-N 3 C 2 , and Co-N 2 C 3 , respectively. Further density functional theory (DFT) calculations uncover that the increased ratio of Co-C coordination induced electron enrichment of Co atoms and upper-shift the d -band center to near Fermi level, and thus favorably promotes the electron-donating ability of Co centers and strengthens the adsorption of *COOH.
研究领域:
材料科学
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催化化学
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环境科学
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
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2021
·
IF 4.126
Chen Ding,Zijie Mao,Jia-Shun Liang,Xianxian Qin,Qing Zhang,Fan Yang,Qing Li,Wen-Bin Cai
The commercialization of proton exchange membrane fuel cells (PEMFCs) calls for the development of active and durable Pt-based catalysts for oxygen reduction reaction (ORR) by means of a cost-effective and environmentally benign protocol. We report herein an all aqueous phase preparation of carbon supported Au-modified Pt–Co alloy catalyst (Au/Pt–Co/C), which involves the dimethylamine borane co-reduction of aqueous Pt(II) and Co(II) precursors to form a Pt–Co/C catalyst and the ethanol reduction of an aqueous Au(III) precursor to form Au/Pt–Co/C. This Au/Pt–Co/C catalyst not only shows a greatly enhanced ORR activity like the homemade Pt–Co/C and state-of-art Pt–Co/C(com) catalysts as compared to the Pt/C catalyst but also exhibits a much higher durability over the Pt/C(com), homemade Pt–Co/C, and state-of-art Pt–Co/C(com) catalysts in accelerated degradation tests (ADTs) with both half-cell and single-cell configurations. Specifically, the maximum power density of a PEMFC involving the Au/Pt–Co/C cathode suffers only a 6% loss after 30 000 cycles of a standard ADT while that involving the state-of-art Pt–Co/C(com) suffers a 37% loss. This research provides an alternative route to prepare efficient and durable Pt-based ORR catalysts toward a widespread application of PEMFCs.
研究领域:
材料科学
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化学工程
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能源技术
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产品关联
DOI
高影响因子
CARBON
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2023
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IF 10.9
Zhi Liu,Chenhui Liu,Yu Wang,Meiping Song,Jiancheng Guo,Wei Wang,Xueping Gao
Paper-based composite materials exhibit a marked tendency towards thinner and lighter profiles in the context of electromagnetic interference (EMI) shielding. Carbon fiber paper (CFP) has excellent electrical conductivity and Lightweight base characteristics. However, its single electrical loss characteristic and uncontrollable EMI shielding performance are limited in application. Therefore, we prepared CFP@ graphene oxide (GO)/ZIF-67 composites by chemical bonding and in-situ polymerization, and then prepared CFP@rGO/Co/C composites with integrated structure and function by heat treatment. Layer-by-layer assembly technology was employed to develop composite materials with tunable EMI shielding performance. The composite material has excellent high conductivity (2475.86 S/m) and excellent EMI shielding performance (average X-band EMI efficiency (SE)38.46 dB, absolute shielding effectiveness (SSE/t) = 14388.56 dB cm 2 g −1 ). Through the layer-by-layer assembly technology, the EMI SE performance of the 7-layer assembled material reached 85.83 dB, and the EMI SSE/t reached 32110.51 dB cm 2 g −1 . Through simulation verification, the EMI shielding performance of the materials is compared, and ideas for EMI material design are provided. In addition, the material also has excellent Joule heating performance, fast electrothermal response and good temperature controllability. The material exhibits remarkable resilience against harsh environmental conditions, including strong acids, bases, organic reagents, ultrasonic waves, combustive processes, and extremely low temperatures. Despite these severe treatments, its performance remains above 90 % intact. This study proposes a magnetic-dielectric synergistic, performance-adjustable CFP-based shielding material, which has great application potential in the future wearable, defense, and aerospace fields.
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DOI
高影响因子
Journal of Energy Chemistry
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2025
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IF 14.9
Keke Chen,Yang Li,Yuhao Feng,Xuefeng Li,Zhiqiang Li,Shuming Liu,Chunhua Ge,Xiao Chen
Solar-thermoelectric generators (STEGs) capable of harnessing solar energy for conversion into clean electricity are pivotal for advancing towards carbon neutrality. The integration of phase change materials (PCMs) with STEGs facilitates power generation regardless of solar radiation flux due to their robust thermal management capacity. However, the inherent solar-thermal conversion efficiency limitation of PCMs hinders the production of high and sustained electrical output. Herein, a multidimensional engineering strategy is proposed to align two-dimensional (2D) molybdenum disulfide (MoS 2 ) nanosheets vertically in situ on a dodecahedron composed of zero-dimensional (0D) Co nanoparticles and three-dimensional (3D) high graphitized carbon derived from ZIF-67, thus significantly boosting the solar-thermoelectric energy generation of polyethylene glycol (PEG). The resultant PEG-Co/C@MoS 2 composite PCMs exhibit a high solar-thermal conversion efficiency of 92.89%, benefiting from the synergy of multiple components and unique structural arrangements. When coupled with thermoelectric devices, this powerful STEG yields a high and durable output voltage of 197.51 mV and a current of 52.47 mA under 100 mW cm −2 , outperforming the majority of previously reported literature. This PCM-integrated solar-thermoelectric generator overcomes limitations associated with temporal and meteorological variations, enabling simultaneous high-density heat and electricity generation for energy conservation and environmental sustainability.
研究领域:
材料科学
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能源工程
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纳米技术
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DOI
高影响因子
CARBON
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2020
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IF 8.821
Minglong Yang,Ye Yuan,Ying Li,Xianxian Sun,Shasha Wang,Lei Liang,Yuanhao Ning,Jianjun Li,Weilong Yin,Renchao Che,Yibin Li
Lightweight, low-cost electromagnetic (EM) wave absorption materials are in urgent need, as EM interference pollution is increasingly serious. Carbon material as EM absorber has attracted ever increasing attention. However, their absorption property is still limited. Herein, we propose a very simple strategy to prepare hierarchical carbon fiber coated with Co/C nano-dodecahedron particles where CNTs were anchored (HCF@CZ-CNTs), using cotton and metal-organic-framework (MOF) as raw materials. One of MOF, ZIF-67 particles were in-situ grown onto the surface of cotton fibers . Lightweight HCF@CZ-CNTs samples were obtained by direct carbonization , the apparent density of which is only 0.0198 g/cm 3 . The minimum reflection loss (RL min ) of hierarchical HCF@CZ-CNTs was dramatically enhanced to −53.5 dB at 7.8 GHz, compared with pure carbonized cotton fiber (RL min = −18.9 dB at 16 GHz). Meanwhile the effectively absorption bandwidth was also remarkably enlarged to 8.02 GHz. The excellent EM wave absorption performance is attributed to the micro-to-nano hierarchical hollow fibrous structure , as well as the synergetic effect of polarization relaxation and magnetic loss. These results illuminate a low-cost and sustainable strategy to prepare ultra-lightweight microwave absorbers with excellent EM wave absorbing ability utilizing biomass precursor and MOF.
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
Nature Communications
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2021
·Vol. 12
·期 1
·1-12
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IF 14.919
Xie Chao,Lin Longfei,Huang Liang,Wang Zixin,Jiang Zhiwei,Zhang Zehui,Han Buxing
Selective cleavage of C-C bonds is very important in organic chemistry, but remains challenging because of their inert chemical nature. Herein, we report that Zn/NC-X catalysts, in which Zn 2+ coordinate with N species on microporous N-doped carbon (NC) and X denotes the pyrolysis temperature, can effectively catalyze aerobic oxidative cleavage of C(CO)-C bonds and quantitatively convert acetophenone to methyl benzoate with a yield of 99% at 100 °C. The Zn/NC-950 can be applied for a wide scope of acetophenone derivatives as well as more challenging alkyl ketones. Detail mechanistic investigations reveal that the catalytic performance of Zn/NC-950 can be attributed to the coordination between Zn 2+ and N species to change the electronic state of the metal, synergetic effect of the Zn single sites with their surrounding N atoms, as well as the microporous structure with the high surface area and structural defects of the NC.
研究领域:
有机化学
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催化材料科学
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
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2023
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IF 8.8
Hang Lv,Yuandong Huo,Manlu Cheng,Zenghui Diao,Gang Song,Diyun Chen,Lingjun Kong
A kind of high yield and recyclable Cobalt–Carbon composite (Zn 1 Co 5 /P n C) was prepared by carbothermal reduction process, in which the cobalt acetate and zinc acetate were considered as Zn and Co precursors, and the polyester waste was evolved as the carbon precursor. The morphology, structure and composition of the composite were characterized using scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. Results showed that evaporation of zinc contributed to the formation of porous carbon structure, and the Co nanoparticles were wrapped and protected by the porous carbon matrix. The Zn 1 Co 5 /P n C activated peroxymonosulfate (PMS) system (Zn 1 Co 5 /P n C/PMS) was constructed to degrade the levofloxacin (LEV). The activity and mechanism of LEV degradation was understood. The LEV degradation efficiency was high to 96.60% within 90 min in the presence of Zn 1 Co 5 /P 4 C. Moreover, the Zn 1 Co 5 /P 4 C still maintained favorable PMS activation performance after five-cycle runs. The results show that the Zn 1 Co 5 /P 4 C played positive role in activating the PMS, it may be due to the facts that the polyester derived carbon could supported the Co while the evaporated Zn could increase the surface area of Zn 1 Co 5 /P 4 C, leading to the increased activity. The possible degradation pathways were proposed by identifying the intermediate products through liquid chromatography-mass spectrometry analysis. This study put forward a promising method to use polyester waste to synthesize high yield cobalt-carbon composite for degrading the antibiotic in wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
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2023
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IF 5.2
Lin Tan,Jing Han,Chuanwen Wang,Genwang Zhang,Huixia Feng,Nali Chen,Dan Zhao
Due to their physicochemical properties, the three-dimensional Metal-organic frameworks (MOFs) derived composites show great potential as electromagnetic wave (EMW) absorbers. However, poor impedance matching limits their actual EMW absorption performance. Composite materials that combine magnetic and dielectric losses offer a potential solution to enhance impedance match and significantly improve microwave absorption. In this work, a novel N,S-GS/Co/C composite was fabricated via a solvothermal method and a subsequent pyrolysis process to introducing nitrogen and sulfur co-doped graphene (N,S-GS) into Co-MOF. By co-doping nitrogen and sulfur, abundant defects and disordered sites were introduced on graphene, which stimulate interfacial polarization and dipole polarization. The minimum reflection loss (RL) of the sample obtained by pyrolysis at 600 °C is −68.8 dB at 9.7 GHz. Simultaneously, the thickness is 2.51 mm, and the effective absorption bandwidth (EAB) can reach 3.04 GHz. Its excellent EMW absorption performance is mainly attributed to interfacial polarization, multiple reflections, dipole polarization, magnetic resonance and eddy current loss. Accordingly, the N,S-GS/Co/C composite is convinced to be a competent candidate among EMW absorbers with high absorption intensity.
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 Materials Chemistry A
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2026
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IF 9.2
Zhao Meng,Haibo Yang,Yongzhen Ma,Yan Cheng,Yanlong Ma,Binglong Zheng,Hongwei Zhou,Ying Lin
In increasingly complex electromagnetic environments, developing high-performance and dynamically tunable electromagnetic wave (EMW) absorption materials is essential. This study designed a pressure-responsive TiO2/CNFs@Co/C elastic aerogel for efficient EMW absorption. A 3D interpenetrating structure consisting of Ti3C2Tx MXene-derived TiO2 nanosheets, magnetic Co/C frameworks, and carbon nanofibers was constructed via electrospinning combined with in situ synthesis. This 3D interpenetrating structure constructs abundant heterogeneous interfaces, thereby enhancing interfacial polarization. The results demonstrate that the composite achieves an exceptionally broad effective absorption bandwidth (EAB) of 8.17 GHz at a thickness of 2.7 mm, with only 10 wt% filler loading. Additionally, the composite exhibits strong environmental tolerance, including hydrophobicity, stretchability, and thermal insulation. Notably, the alginate-induced elastic aerogels enable dynamic tuning from 6.4 to 18 GHz under compressive strains of 0% to 66%. This work designs dynamically tunable, high-performance EMW absorbers through component optimization and interface engineering, providing a promising strategy for the preparation of next-generation multifunctional intelligent EMW absorbers.
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DOI
高影响因子
NANOTECHNOLOGY
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2020
·Vol. 31
·期 39
·395710
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IF 3.551
Yan Wang,Xiaochuang Di,Xiang Gao,Xinming Wu
Carbon-based composites have triggered tremendous attention in the development of high-efficiency microwave absorbers, due to their compatibility, light weight, and high microwave absorption. However, fabricating carbon-based absorbers with a strong absorption ability in a broad frequency range is challenging. Hence, a facile strategy was used to produce Co@C derived from a zeolitic imidazolate framework (ZIF)@ graphene. The Co@C@RGO composite was obtained by annealing the ZIF67/GO nanocomposite precursor at 650 °C in a nitrogen atmosphere. Due to the magnetic loss induced by the Co particles, the dielectric loss generated by the carbon skeletons and graphene, and the interfacial polarization between the components, the hierarchical composite exhibits superior electromagnetic (EM) wave absorption properties. The optimal reflection loss (RL) of the Co@C@ RGO composite can be up to −67.5 dB at 2.6 mm, and the effective bandwidth (≥−10 dB) is 5.4 GHz (10–15.4 GHz) with a thickness of 2 mm at 20 wt% loading. The dipolar polarization caused by graphene, as well as enhanced impedance matching, synergistic effect and interfacial effect among the components, increase the microwave absorption performance of the composite. This work may open a new path to use the Co@C@RGO composite with its high-efficiency EM wave properties as an absorber.
研究领域:
材料科学
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电磁学
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2026
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IF 7.8
Yuxin Xu,Jiahao Zhu,Yi Zhang,Zhong Zhang,Qingwei Li,Dan Liu,Haitao Niu,Hua Zhou
Personal protective textiles showing high-performance electromagnetic wave absorption (EWA) along with multiple functions demonstrate considerable application prospects in daily life. Herein, a single-step, environmentally friendly, water-based fabrication strategy is developed to produce a durable and highly efficient EWA coating on PET fabrics, simultaneously integrating antibacterial, antistatic, and high-performance water/sweat-wicking properties. This multifunctional coating is realized through the synergistic interaction of its coating constituents including the incorporation of Co@C nanoparticles (NPs) derived from Co-based zeolitic imidazolate frameworks (ZIF-67), the in situ reduction of graphene oxide (GO) facilitated by fatty acid methyl ester ethoxylate sodium sulfonate (FMES), and the 3-glycidyloxypropyl triethoxysilane (GPTMS)-mediated cross-linking. The resulting Co@C/rGO/GPTMS-coated PET fabric exhibits excellent moisture-wicking and water adsorption capacity. Benefiting from the combined effects of conduction loss, interfacial polarization loss, and a hierarchical surface structure, it demonstrates outstanding EWA performance with an RLmin of −56.5 dB and EABmax covering the entire X-band. The incorporation of Co@C and rGO within the coating matrix imparts robust antibacterial and antistatic properties, achieving an antibacterial rate of over 99% against both Staphylococcus aureus and Escherichia coli, along with a significant reduction in static voltage to 130 V and a short half-life of merely 0.01 s.
✓ 已验证
DOI
PubMed
高影响因子
POLYMER TESTING
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2026
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IF 6.4
Mei Yin,Jiamei Luo,Minqiang Jiang,Yong Liu,Youwei Zhang,Hui Zhang,Jianyong Yu
The widespread use of highly integrated smart electronic devices has led to serious electromagnetic pollution, making electromagnetic interference (EMI) shielding materials a crucial solution for controlling electromagnetic radiation. This study utilizes electrostatic self-assembly between negatively charged Co/C@TNF felts and positively charged cetyltrimethylammonium bromide (CTAB) functionalized multiwall carbon nanotubes (fMWNT) to construct a unique three-dimensional (3D) structure within epoxy resin (EP). Due to electrostatic interactions, fMWNT were uniformly loaded on Co/C@TNF felts. These well-dispersed fMWNT serve as bridges, connecting adjacent Co/C@TNF felts and EP, forming a more efficient conductive network, thereby obtaining composites with enhanced mechanical properties and superior EMI shielding effectiveness (EMI SE). The optimized EMI SE of xfMWNT/Co/C@TNF-EP composites reached 54.4 dB, which was 19.3% higher than that of pure Co/C@TNF-EP. Additionally, the flexural properties of the xfMWNT/Co/C@TNF-EP composites were also markedly enhanced, with a flexural strength of 164.40 MPa.
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DOI
高影响因子
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