ChemCatChem
·
2020
·Vol. 12
·期 8
·2209-2214
·
IF 4.853
Qingquan Kong,Weijing Bai,Fangzheng Bai,Xuguang An,Wei Feng,Fengling Zhou,Qiuyue Chen,Qingyuan Wang,Chenghua Sun
Graphical Foam Water Oxidation : FeCoNi spinel oxides nanosheets array directly supported on the Ni foam substrate were successfully prepared. The optimized 0.1Fe−CoNiO/NF achieve an ultralow overpotentials of 240 mV at 10 mA cm −2 and a small Tafel slope of 36.8 mV dec −1 , with attractive durability during long-term operation in 1 M KOH solution. Such performance can be essentially ascribed to the comprehensive effects of high intrinsic catalytic activity, high surface area and good conductivity. FeCoNi spinel oxides nanosheets array directly supported on the Ni foam substrate were prepared via a facile wet chemical method with 2-methylimidazole as a structure directing agent and subsequently annealing. The as-prepared 0.1Fe−CoNiO/NF offers high intrinsic catalytic activity, high surface area and good conductivity, resulting in enhanced activity for the oxygen evolution reaction (OER) in the alkaline solution. It demonstrates an ultralow overpotentials of 240 mV at 10 mA cm −2 and a small Tafel slope of 36.8 mV dec −1 , with attractive durability during long-term operation in 1 M KOH solution.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Qingkun Xu,Xiaofen Li,Hantao He,Shuixiu Luo,Yi Yu,Zuzhou Xiong,Jujun Yuan,Xianke Zhang,Xiaoqing Liu,Xiurong Zhu
Utilizing the multiple magnetic resonance properties of polymetallic alloys and considering the high electrical conductivity, porous structure, and high specific surface area of traditional phenolic-aldehyde-based carbon aerogels (CAs), ternary FeCoNi alloy nanoparticle-doped CAs (FeCoNi-CAs) with impressive core–shell structure were prepared via a simplified sol–gel method using 1,2-epoxypropane as a catalyst. The composition, conductivity, morphology, textural characteristics, electromagnetic wave absorption (EMA) properties and mechanisms, and radar cross-section (RCS) values of FeCoNi-CAs were first investigated in detail by adjusting the molar ratio of Fe, Co, and Ni elements. The results revealed that the optimum EMA properties occur at the molar ratio of Fe/Co/Ni = 4:1:5, and its corresponding Fe4Co1Ni5-CAs have a maximum effective absorption bandwidth (EABmax) of 6.21 GHz (10.43–16.64 GHz) at a matching thickness of only 1.91 mm. Meanwhile, it possesses a minimum reflection loss (RLmin) of −54.9 dB and an EAB of 5.61 GHz (11.11–16.72 GHz) at the same matching thickness of only 1.87 mm in the medium- and high-frequency regions. The Fe4Co1Ni5-CAs also show the EABmax of 2.38 GHz (matching thickness: only 3.4 mm, 5.59–7.97 GHz) in the low-frequency region. Further analysis demonstrates that the excellent EMA performance of Fe4Co1Ni5-CAs is mainly ascribed to its higher conductivity stemming from its unique Fe/Co/Ni ratio. Not only does this ratio promote the dielectric loss, but simultaneously, it heightens the magnetic loss. This, in turn, intensifies the combined influence of both dielectric and magnetic losses, giving rise to excellent impedance matching properties. This study could offer a catalyst and a more feasible way to synthesize polymetallic nanoparticle-doped CAs featuring diverse microstructures and superior EMA characteristics.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Pinbo Li,Yazhen Zhao,Yu Zhao,Junfeng Yan,Huiting Zhao,Wu Zhao,Jiangni Yun,Cheng Chen,Zhouhu Deng,Zhiyong Zhang
Recently, Prussian blue analogues (PBA) have emerged as attractive precursors or templates for the construction of porous carbon-based microwave absorption (MA) materials because of their open framework, tunable components and mild synthesis conditions. Herein, for the first time, trimetallic FeCoNi-PBA nanocubes are introduced as precursors, and then a novel core-shell structured composites, in which FeCo and FeCoNi alloy nanoparticles are uniformly encapsulated in N-doped porous carbon (FeCo/FeCoNi@NPC), are successfully synthesized via a pyrolysis process . Benefiting from the strong synergetic effects among multiple components (FeCo, FeCoNi alloys and N-doped carbon species) and the hierarchical porous structure , the absorber exhibits significantly enhanced MA performance in comparison with FeNi@NPC and FeCo@NPC derived from bimetallic PBAs. Impressively, the minimum reflection loss (RL) is up to −67 dB at 14.7 GHz with a thin thickness of 1.91 mm, and the corresponding effective absorption bandwidth (EAB) reaches 6.24 GHz, covering the whole Ku-band. When the thickness is 2.05 mm, the maximum EAB of 6.6 GHz can be obtained. In particular, the absorber can also achieve full absorption of X-band at 2.68 mm. More importantly, the multi-metallic PBA derivation strategy sheds new light on development of lightweight carbon-based absorbers with high performance, low cost and easy synthesis.
研究领域:
材料科学
·
电磁材料
·
纳米材料
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Xiao Wang,Yuxin Jin,Hongguo Zhang,Qiong Wu
Ion-intercalated MoS2 can enhance its electrochemical activity, electrical conductivity, and stability, which can be combined with other materials to meet specific application requirements, such as the fields of electrochemistry and microwave absorption. This study explored the modulation of electromagnetic characteristics of ion-intercalated MoS2-based ternary FeCoNi alloy nanocomposites, in which MoS2 provides more contact sites for an electromagnetic wave, and the heterogeneous interfaces formed by the heterogeneous structure can improve the stronger interface polarization to enhance the dielectric loss. In addition, by inserting nano-FeCoNi alloy particles into the interlayers of MoS2, the FeCoNi alloy also enhanced the magnetic loss capabilities, in which the impedance matching of FeCoNi/MoS2 composites was also regulated. The results show that the FeCoNi/MoS2 composite achieved a minimum RL (RLmin) value of −54.73 dB at 4.20 GHz with a matching thickness of 3.29 mm, and the effective absorption bandwidth (EAB) was 4.72 GHz at a thickness of 1.32 mm. In addition, the radar cross section (RCS) and COMSOL simulation results verify the possibility of application. The study revealed the microwave loss mechanisms of the FeCoNi/MoS2 heterostructured composites, providing insights for designing novel low-frequency absorbing materials.
研究领域:
材料科学
·
电磁学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2020
·
IF 3.693
Teng Wanqing,Huo Mengtian,Sun Zhaomei,Yang Wenrong,Zheng Xiangjiang,Ding Caifeng,Zhang Shusheng
It is highly promising to design and develop efficient and economical electrocatalysts for oxygen evolution reaction (OER) in alkaline solution. In this work, we prepare FeCoNi sulfide composites (including FeS, Co3S4, and Ni3S4) derived from in situ sulfurization of precursor oxides on carbon cloth (CC), which are used to become an OER catalyst. Such catalyst shows excellent OER performance, low overpotential, small Tafel slope, and high electrochemical stability, and it is a promising electrocatalyst for OER in alkaline media.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Yuning Su,Xuewei Ding,Jiongliang Yuan
Fe-based catalysts have a good prospect in oxygen reduction reaction (ORR) in fuel cells. However, the catalytic activity of Fe-based catalysts requires further improvement to satisfy the demand in industrial application and the working mechanism is still shrouded in ambiguity. Here, a ferromagnetic catalyst with nitrogen-doped carbon supported FeCoNi alloy was synthesized by impregnation-pyrolysis method. The micromorphology and structure of the catalyst was analyzed by XRD , SEM, TEM, XPS, BET and Raman spectroscopy . The trimetallic catalyst showed high ORR activity in 0.1 M KOH with a half-wave potential of 0.908 V and a limiting current density of 6.153 mA cm −2 , which was superior to 20 % Pt/C. The synergistic effect of FeCoNi alloy regulated the spin polarization and the regulated spin state improved ORR performance by facilitating the adsorption of O 2 molecules and the conversion of the activated intermediates.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
Materials
·
2024
·Vol. 18
·期 1
·113
·
IF 3.1
Yifan Fei,Junya Yao,Wei Cheng,Wenling Jiao
Microwave absorbers with infrared camouflage are highly desirable in military fields. Self-supporting 3D architectures with tailorable shapes, composed of FeCoNi alloy/carbon nanotubes (CNTs) @ carbon nanofibers (CNFs), were fabricated in this study. On the one hand, multiple loss mechanisms were introduced into the high-elastic sponges. Controllable space conductive networks caused by the in situ growth of CNTs on the CNFs contributed to the effective dielectric and resistance loss. Moreover, the uniformly distributed magnetic alloy nanoparticles (NPs) with dense magnetic coupling resulted in magnetic loss. On the other hand, heterogeneous interfaces were constructed by multicomponent engineering, causing interfacial polarization and polarization loss. Furthermore, the internal structures of sponges were optimized by regulating the alloy NPs sizes and the growth state of CNTs, then tuning the impedance matching and microwave absorption. Therefore, the high-elastic sponges with ultra-low density (7.6 mg·cm−3) were found to have excellent radar and infrared-compatible stealth properties, displaying a minimum refection loss (RLmin) of −50.5 dB and a maximum effective absorption bandwidth (EABmax) of 5.36 GHz. Moreover, the radar stealth effect of the sponges was evaluated by radar cross-section (RCS) simulation, revealing that the multifunctional sponges have a promising prospect in military applications.
研究领域:
材料科学
·
电磁学
·
军事应用
✓ 已验证
产品关联
DOI
PubMed
高影响因子
npj Science of Food
·
2025
·Vol. 9
·期 1
·1-10
·
IF 7.8
Zhao Huamin,Zheng Xiaoxi,Su Jihao,Wang Jun,Wang Xinrui,Li Hang,Wang Juan,Shen Kexin,Zhao Chao
Electrochemical detection of foodborne pathogens requires simplified electrode modification and enhanced sensitivity. This study introduced Cd-decorated ternary FeCoNi layered double hydroxides (Cd-FeCoNi LDHs) platform for label-free Staphylococcus aureus ( S. aureus ) detection via Cu 2+ biosorption. The FeCoNi LDHs were engineered with optimized metal sites to create lamellar structures with high electrocatalytic surface area. Further incorporating with Cd particles deposition, the response of the Cd-FeCoNi LDHs to Cu 2+ exhibited a double-enhanced differential pulse voltammetry signal. Concurrently, S. aureus has been explored to adsorb Cu 2+ through surface carboxyl and phosphate groups. By integrating with specific magnetic separation, the variation of Cu 2+ derived from biosorption by S. aureus triggered the rapid electrical response of the Cd-FeCoNi LDHs platform. This approach achieved 5.4 CFU/mL detection without bio-labeling, while resisting matrix interference. This work highlighted the innovative application of bacterial metal ions biosorption and label-free sensing platform for foodborne pathogen detection.
研究领域:
生物电化学
·
材料科学
·
微生物检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2021
·Vol. 12
·期 1
·1-13
·
IF 14.919
Ji Xixi,Lin Yanhong,Zeng Jie,Ren Zhonghua,Lin Zijia,Mu Yongbiao,Qiu Yejun,Yu Jie
Development of excellent and cheap electrocatalysts for water electrolysis is of great significance for application of hydrogen energy. Here, we show a highly efficient and stable oxygen evolution reaction (OER) catalyst with multilayer-stacked hybrid structure, in which vertical graphene nanosheets (VGSs), MoS 2 nanosheets, and layered FeCoNi hydroxides (FeCoNi(OH) x ) are successively grown on carbon fibers (CF/VGSs/MoS 2 /FeCoNi(OH) x ). The catalyst exhibits excellent OER performance with a low overpotential of 225 and 241 mV to attain 500 and 1000 mA cm −2 and small Tafel slope of 29.2 mV dec −1 . Theoretical calculation indicates that compositing of FeCoNi(OH) x with MoS 2 could generate favorable electronic structure and decrease the OER overpotential, promoting the electrocatalytic activity. An alkaline water electrolyzer is established using CF/VGSs/MoS 2 /FeCoNi(OH) x anode for overall water splitting, which generates a current density of 100 mA cm −2 at 1.59 V with excellent stability over 100 h. Our highly efficient catalysts have great prospect for water electrolysis.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2025
·
IF 5.7
Shengyuan Liang,Junjie Wang,Dunyan Jiang,Lijun Wang,Shikuo Li
Designing rational and lightweight magnetic-dielectric composites for efficient electromagnetic wave absorption remains a significant challenge. Herein, the FeCoNi metal-induced nitrogen-doped carbon nanotubes (FeCoNi@NCNTs) were synthesized though unique nanoconfinement strategy during carbon thermal reduction reaction. In confined environment, sufficient conditions were provided for the multidimensional growth of nanostructures. The mechanisms of carbon nanotube growth and electromagnetic wave absorption were further investigated. The FeCoNi@NCNTs exhibited a minimum reflection loss of -59.5 dB within the 2–18 GHz frequency range. Moreover, the composite achieved a minimum effective absorption bandwidth of 5.3 GHz at 2.0 mm. This work provides a new insight for preparing various magnetic-dielectric composites with rich absorption effects and broadband microwave absorption.
研究领域:
材料科学
·
电磁学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Hongrui Huang,Qianqian Liang,Guangchao Li,Huajun Guo,Zhixing Wang,Guochun Yan,Xinhai Li,Hui Duan,Jiexi Wang
Rechargeable Zn–air batteries (RZABs) are poised for industrial application, yet they require low-cost, high-performance catalysts that efficiently facilitate both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). The pivotal challenge lies in designing multimetal active sites and optimizing the carbon skeleton structure to modulate catalyst activity. In this study, we introduce a novel hierarchical porous carbon-supported FeCoNi bifunctional catalyst, synthesized via a spray combustion method. The carbon, derived from sucrose, was tailored into a hierarchical porous morphology through etching with NO3– ions and NaCl, thereby significantly increasing the surface area for the interaction of the O2 and electrolyte interaction. The in situ formation of FeCoNi alloy nanoparticles ensures their uniform dispersion and anchoring, facilitating electron transport. The strong interaction and charge transfer at the heterogeneous FeCoNi alloy interfaces, along with nitrogen doping, which enhances the OER/ORR activity, endow the FeCoNi/N-PC catalyst with exceptional bifunctional catalytic properties, characterized by an activity parameter of 0.73 V. Furthermore, the RZAB assembled with this catalyst demonstrates outstanding cycling stability and reversibility, with a minimal round-trip efficiency decay of 7.6% over 1380 cycles (460 h) at 10 mA cm–2.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Jing Ouyang,Zilong He,Yi Zhang,Huaming Yang,Qihang Zhao
Organic ligands and metal ions in the metal–organic frameworks (MOFs, a type of porous magnetic metal/carbon nanocomposites obtained through high-temperature carbonization) have caused widespread concerns in the field of microwave absorption because of the existence of various microwave loss mechanisms in these materials. However, MOF-driven microwave absorbing materials with high absorption intensity and wide absorption band still require further research and development. In this work, hollow sphere trimetallic FeCoNi@C microwave absorbing materials via high-temperature carbonization were obtained using FeCoNi-based MOF-74 (FeCoNi-MOF) as the precursor. The effects of different carbonization conditions on the microwave absorption properties of the materials were studied. FeCoNi-MOF-74 annealed at 700 °C showed superior microwave absorption capacity, where the RL value reached −64.75 dB at 15.44 GHz corresponding to the actual application thickness of the absorber (only 2.1 mm), and the minimum RL values reached −69.03 dB at 5.52 GHz. Furthermore, the as-prepared sample can fully cover the Ku band and X band at only 2.1 and 3.1 mm, respectively. The maximum EAB reached 8.08 GHz (9.92–18 GHz) when the thickness of the absorber was 2.47 mm. Such remarkable absorption performance is attributed to the synergetic effects between the multiple loss mechanisms of the FeCoNi@C, and the improved impedance matching characteristic came from the hollow sphere morphology.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）