JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Qiqi Gu,Shijin Cheng,Qiaoyi Xiao,Qianchen Ou,Hongmei Wang,Yuan Lian,Liping Guo
The FeCo-LDH/Cd 1-x Zn x S nanocomposite was synthesized via an impregnation method, employing FeCo-LDH as a cocatalyst for simultaneous upcycling of polyethylene terephthalate (PET) plastics and photocatalytic hydrogen production. The 5 %LDH/Cd 0.5 Zn 0.5 S nanocomposite demonstrated an optimal hydrogen evolution rate of 3.67 mmol·g −1 ·h −1 in alkaline PET solution, which is 2.3 times higher than pristine Cd 0.5 Zn 0.5 S. Notably, the photocatalyst retained stable performance over six recycling tests without significant activity loss. Concurrently, PET oxidation by photogenerated holes yielded acetate as the primary product, achieving an 87 % yield. The real-world applicability of this approach was further validated through the successful photoreforming of a PET bottle. UV–vis DRS, TRPL, and PEC analyses revealed that the incorporation of appropriate amount of FeCo-LDH significantly enhanced charge carrier separation, thereby boosting the photocatalytic activity. Furthermore, UPS and DFT calculations elucidated the mechanistic pathway for PET conversion and hydrogen production over FeCo-LDH/Cd 0.5 Zn 0.5 S. This study presents a promising strategy for co-producing hydrogen and value-added chemicals from PET waste, highlighting its potential for practical recycling applications.
研究领域:
材料科学
·
环境科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2019
·
IF 1.293
Junyao Shen,Yongtao Yao,Yanju Liu,Jinsong Leng
Amorphous FeCo nanowires (NWs) with the average diameter of 120 nm were successfully prepared with a magnetic-field-assisted (MFA) hydrothermal method. Rapid reaction time was adopted to obtain amorphous FeCo NWs, being checked by XRD and TEM. Tuning the stoichiometric ratio of Fe/Co content meets the optimal impedance matching under different absorption frequency, making both improved intensities and frequency ranges of microwave absorption. For example, under 3 mm coating thickness, the reflection loss (RL) peaks of Fe 3 Co 7 , Fe 5 Co 5 and Fe 7 Co 3 NWs are − 25.88 dB at 4 GHz, − 19.06 dB at 4.24 GHz and − 21.98 dB at 5.44 GHz. The related efficient absorption bandwidths ( f E < − 10 dB) of Fe 3 Co 7 NWs, Fe 5 Co 5 NWs and Fe 7 Co 3 NWs are 5.40 GHz, 3.52 GHz and 4.91 GHz, respectively. It is ascribed to integrating enhanced dielectric/conductive losses, negligible damages from eddy current effect and good impedance matching for high-performance FeCo NWs absorbers. This work paves a new path on synthesizing bimetallic wire-like nanostructures for microwave absorption demands.
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
Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Qian Ma,Rong Qiang,Yulong Shao,Xiao Yang,Yi Chen,Rui Xue,Fangjie Ren,Yuancheng Ding,Lei Rong,Jingbo Fang,Qing Miao,Zheng Guo
Nowadays, the issue of electromagnetic pollution has become increasingly prominent, underscoring the critical importance of developing high-performance microwave absorbers. This study put forwards the synthesis process of two-dimensional (2D) FeCo/Co 8 FeS 8 /C carbon nanosheets, wherein CoSO 4 and FeCl 3 serve as inorganic salt templates, and dopamine functions as the carbon source. FeCo alloy nanoparticles and Co 8 FeS 8 nanoparticles are loaded on the surface of the carbon layer. 2D structure forms the conductive network, which proves advantages in establishing efficient electronic channels and minimizing conduction losses. The carbon component increases the dielectric constant of the composite and improves its impedance matching, and the FeCo alloy provides a certain ML. The synergistic effect between these components significantly contributes to the exceptional microwave absorption performance of the composites. Accordingly, the minimum reflection loss ( R L min) of FeCo/Co 8 FeS 8 /C composite reaches −47.4 dB, its effective absorption bandwidth (EAB) reaches 5.3 GHz. In particular, CST confirms that radar cross-section reduction value of FeCo/Co 8 FeS 8 /C composite can reach 20.2 dB m 2 in the range of −90° < phi< 90°, indicating a high microwave attenuation ability. The study introduces a novel strategy for advancing the development of two-dimensional carbon-based absorption materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 3
·2212-2225
·
IF 3.553
Guo Yue,Sun Qiaozhi,Song Kai,Ding Jiawei,Shi Chunsheng,He Fang
With the aim to obtain microwave (MW) absorber possessing simultaneous light weight and broad absorption bandwidth, FeCo imbedded 3D porous carbon network microspheres (3DC@FeCo) were synthesized via spray-drying followed by calcination processes. 3DC@FeCo exhibits 3D porous carbon microspheres structure with submicrometer-sized macropores. The FeCo imbedded carbon structure not only restrains the growth and agglomeration of FeCo nanoparticles, but also effectively introduces polarization and suppresses the skin effect from FeCo. In addition, the 3D porous carbon microspheres provide more channels which enhance the multiple reflection for microwave. The microwave absorption performance of 3DC@FeCo can be adjusted through changing the carbonization temperature, and the sample after carbonized at 630 °C (3DC@FeCo-630) shows the best microwave absorption property. It is worth mentioning that there is only 21.8 wt% FeCo in 3DC@FeCo, indicating that the 3DC@FeCo microspheres proposed in this study are one kind of lightweight microwave absorbers. The minimum reflection loss (RL) value of 3DC@FeCo-630 is − 47.4 dB at 6.35 GHz and the effective absorption bandwidth (RL < − 10 dB) can reach up 5.66 GHz (12.08–17.74 GHz) with the matching thickness of only 2.7 mm. The excellent microwave absorption ability can be attributed to favorable impedance matching, strong dielectric loss, magnetic loss, FeCo imbedded carbon and unique 3D porous structure. 3DC@FeCo microspheres as broadband and lightweight microwave absorbers exhibit a promising prospect applied in complex electromagnetic environments.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Juntao Zhang,Min Li,Xin Liang,Zhongbin Zhuang
Active nonprecious metal-based hydrogen evolution reaction (HER) electrocatalysts are critical for the clean and sustainable generation of hydrogen. Here, we synthesized multishelled FeCo@FeCoP@C hollow spheres by the carbonization and phosphorization of the FeCo-MIL-88 metal-organic framework. Owing to both composition (FeCo mixed phosphide) and morphology (multishelled morphology) effects, the as-obtained FeCo@FeCoP@C exhibits excellent HER performance with a low overpotential of 65 mV to achieve an HER current density of 10 mA cm–2 and high stability in acidic solution. Density functional theory calculations show that the FeCoP have the optimal hydrogen absorption energy than that of FeP and CoP. The carbon shell prevents the oxidation of the phosphides, and the FeCo core provides better conductivity. Our work provides a new method to synthesize multishelled structure catalysts, which has potential applications in the further hydrogen production.
研究领域:
材料科学
·
能源化学
·
理论计算
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Qiao Wu,Tianle Li,Wenju Wang,Yupeng Xiao
Oxygen evolution reaction (OER) is a key part of water electrolysis for hydrogen production . Non-noble-metal catalysts with high activity, stability, but low cost are prerequisites for practical application. In this work, sucrose char was synthesized and then chainmail catalysts were produced by in situ growth method, defined as M@C (M = Fe, Co and FeCo). FeCo@C showed great OER performance in both catalytic activity and durability tests. The overpotentials were 302 mV (at the current density of 10 mA cm −2 ) and 423 mV (at 50 mA cm −2 ), with a lowest Tafel slope of 75 mV dec −1 . The electrochemical surface area of catalysts were also analyzed by calculating the capacitance of the double layer to further investigate the catalytic activity. Furthermore, FeCo@C showed superior stability after 30 h test or 10,000 cycles of cyclic voltammetry . Theoretical calculation based on density functional theory (DFT) demonstrated that the overpotential of OER was determined by the Gibbs free energies of reaction intermediates HO∗, O∗ and HOO∗. The adsorption of HO∗ radicals onto the FeCo@C was weaker than Fe@C, which was favorable for reducing the overpotential, as the rate-determining step of the OER process over these catalysts was that HO∗ dehydrogenated to form O∗.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Meng Ma,Wenting Tao,Xianjun Liao,Si Chen,Yanqin Shi,Huiwen He,Xu Wang
Conductive polymer composites (CPCs) had attracted tremendous attention in the field of electromagnetic interference (EMI) shielding. However, these materials encountered an intrinsic contradiction between high EMI shielding effectiveness (EMI SE) and low electromagnetic waves reflection. Herein, an excellent EMI SE and low electromagnetic waves reflection composite film with a controllable magnetic-conductive dual gradient structure was constructed using cellulose nanofiber (CNF), MXene, and FeCo by layer-by-layer vacuum filtration method. Benefiting from the synergy of the transition layers and reflection layer with gradient structure, the composite film exhibited favorable impedance matching, abundant loss mechanism, and efficient EMI shielding ability, resulting in absorption dominated shielding characteristic. In addition, the gradient structure facilitated the “absorb-reflect-reabsorb” process when electromagnetic waves were transmitted into the composite film. The obtained CNF/MXene/FeCo-G composite film possessed a remarkable EMI SE of 58.0 dB and the reflection coefficient (R) as low as 0.61. It was proven that the electromagnetic waves absorbing ability can be enhanced by thickening the transition layers, and the EMI SE was improved with the thickening of the reflection layer. Therefore, this work provided a facile strategy to prepare high EMI SE materials with low reflection, which had a good application prospect as the new-generated smart electronic devices.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Pinghua Chen,Yirou Wu,Xuan Guo,Mengxue Wang,Cong Yu,Hualin Jiang,Weiqiang Zhou,Guanghui Wu,Jianan Yan
The rational design of nonnoble-metal-based catalysts with high electroactivity and long-term stability, featuring controllable active sites, remains a significant challenge for achieving effective water electrolysis. Herein, a heterogeneous catalyst with a FeCo-S and Ni2P heterostructure (denoted FeCo-S/Ni2P/NF) grown on nickel foam (NF) was synthesized by a solvothermal method and low-temperature phosphorization. The FeCo-S/Ni2P/NF catalyst shows excellent electrocatalytic performance and stability in alkaline solution. The FeCo-S/Ni2P/NF catalyst demonstrates low overpotentials (η) for both the hydrogen evolution reaction (HER) (49 mV@10 mA cm–2) and the oxygen evolution reaction (OER) (279 mV@100 mA cm–2). Assembling the FeCo-S/Ni2P/NF catalyst as both cathode and anode in an electrolytic cell for overall water splitting (OWS) needs an ultralow cell voltage of 1.57 V to attain a current density (CD) of 300 mA cm–2. Furthermore, it demonstrates excellent durability, significantly outperforming the commercial Pt/C∥IrO2 system. The results of experiments indicate that the heterostructure and synergistic effect of FeCo-S and Ni2P can significantly enhance conductivity, facilitate mass/ion transport and gas evolution, and expose more active sites, thereby improving the catalytic activity of the electrocatalyst for the OWS. This study provides a rational approach for the development of commercially promising dual-functional electrocatalysts.
研究领域:
材料科学
·
电化学
·
可再生能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2025
·
IF 2.6
Feng Jiao,Jinzhao Huang,Zehui Liu,Yu Zhang,Xiaolong Deng,Ke Zhang,Guixin Zhao
In this paper, sodium sulfite (Na₂SO₃) and cerium nitrate (Ce(NO₃)₃) were added in the hydrothermal method for the preparation of FeCo LDH, and needle-like Ce-FeCo LDH (NS) catalysts were grown in situ on a carbon cloth.The additions of Na₂SO₃ and Ce(NO₃)₃ regulated the electron transfer of the metal cations in the LDH, and significantly improved the performance of the catalysts. The prepared Ce-FeCo LDH (NS) catalysts exhibited excellent electrochemical properties. The overpotential of OER was 221 mV at a current density of 10 mA/cm² in 1 M KOH. The surface structure and catalytic performance of the catalysts were maintained well after 100 h stability test. This study provides a new idea for the improvement and design of OER catalysts based on FeCo LDH, which is an important reference for clean energy research.
研究领域:
材料科学
·
清洁能源研究
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2022
·Vol. 10
·期 29
·5582-5593
·
IF 7.571
Fei Kuang,Yingjie Chen,Wei Shan,Yonghai Li,Xichang Bao,Xiang Gao,Dong An,Meng Qiu
The multidrug resistance of bacteria caused by the abuse of traditional antibiotics poses a great threat to public health, so it is urgent to develop effective antibacterial agents to deal with this dilemma. Biomimetics and nanotechnology are expected to provide new strategies for solving this problem. This study takes inspiration from the adhesive protein properties of mussels to design and synthesise biomimetic polydopamine nanospheres (FeCo@PDA NPs), which have strong adhesion and catalytic Fenton reactive enzyme activity. The antibacterial activity of FeCo@PDA NPs against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) is significantly better than that of traditional antibiotics daptomycin (Dap) and vancomycin (Van). PDA NPs with an intrinsic hierarchical structure have the ability to adhere to bacterial surfaces and improve the loading rate of metal ions Fe2+/Co2+. In addition, due to the dual effects of strong adhesion and Co2+, FeCo@PDA NPs can destroy the bacterial membrane structure and release endogenous hydrogen peroxide, which increases the generation of reactive oxygen species by synergistic catalysis of bimetal ions Fe2+/Co2+ to further kill bacteria thoroughly. The cytotoxicity test results show that FeCo@PDA NPs have good cytocompatibility. The impressive antibacterial properties and good biocompatibility of FeCo@PDA NPs make them a potential antibacterial drug.
研究领域:
生物医学工程
·
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Lin Guan,Su Yan,Yangguang Zhu,Da Zhang,Lijin Xu,Xiao Wang,Gang Ao
The development of efficient oxygen evolution reaction electrocatalysts capable of operating at industrial-level current densities (1 A cm −2 ) remains a major bottleneck for clean energy. This work tackles this challenge by constructing three-dimensional FeCo alloy aerogels via a straightforward co-reduction strategy. The unique porous architecture of the optimized Fe1Co2 catalyst enables unparalleled electron and mass transport, registering merely 333 mV even under a high current density of 1 A cm −2 . Moreover, the Fe1Co2 product delivers an outstanding endurability of 120 h continuous voltage output under 1 A cm −2 . Similarly noteworthy is its mass activity, which reaches 226.1 A g −1 at an overpotential of 300 mV. This value exceeds those of commercial benchmark catalysts IrO 2 and RuO 2 by factors of 14.1 and 12.1, respectively. Furthermore, an electrolyzer assembled with Fe1Co2 as the anode and 40%Pt/C as the cathode operates at a lower cell voltage than systems employing noble-metal anodes, confirming its viability for industrial water splitting.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Xia Liu,Xiaolan Fan,Hui Ding,Guancheng Xu,Li Zhang
Rational design of efficient catalysts with high activity and prolonged stability to overcome the sluggish kinetics of electrocatalytic water splitting is imperative but challenging. The optimization of electrocatalysts’ components and geometric structure is deemed an effective strategy. Herein, Fe, Co co-doped Ni5P4 hierarchical cube-on-sheet nanoarrays grown on coal-based carbon nanofibers (FeCo-Ni5P4@C–CNFs) was synthesized by electrospinning, hydrothermal methods, coprecipitation, and phosphorization. Benefiting from metal doping with a strong interaction for electron transfer, the cube-on-sheet architecture with excellent superhydrophilic and aerophobic properties for mass transportation, and self-supported C–CNFs as a conductive substrate with remarkable structural durability, the obtained FeCo-Ni5P4@C–CNFs displays superior bifunctional electrocatalytic properties. In 1.0 M KOH electrolyte, the overpotentials of hydrogen evolution and oxygen evolution reactions are only 46 and 221 mV at a current density of 10 mA cm–2, respectively. In addition, the assembled FeCo-Ni5P4@C–CNFs electrolyzer requires a low cell voltage of 1.50 V at 10 mA cm–2. This study offers a method for the rational design of highly active electrocatalysts and also enriches the means of component and structure modulation of transition metal phosphides.
研究领域:
材料科学
·
电化学
✓ 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）