InfoMat
·
2024
·
IF 22.7
Hongwei Zhou,Ying Lin,Yongzhen Ma,Luyao Han,Zhixin Cai,Yan Cheng,Qibin Yuan,Wenhuan Huang,Haibo Yang,Renchao Che
Developing intelligent electromagnetic wave (EMW) absorption materials with real-time response-ability is of great significance in complex application environments. Herein, highly compressible Fe@CNFs@Co/C elastic aerogels were assembled through the electrospinning method, achieving EMW absorption through pressure changes. By varying the pressure, the effective absorption bandwidth (EAB) of Fe@CNFs@Co/C elastic aerogels shows continuous changes from low frequency to high frequency. The EAB of Fe@CNFs@Co/C elastic aerogels is 14.4 GHz (3.36–17.76 GHz), which covers 90% of the range of S/C/X/Ku bands. The theoretical simulation indicates that the external pressure prompts a reduction in the spacing between the fiber layers in the aerogels and facilitates the formation of a 3D conductive network with enhanced attenuation ability of EMW. The uniform distribution of metal particles and appropriate layer spacing can effectively optimize the impedance matching to achieve the best EMW absorption performance. This work state clearly that the hierarchically assembled elastic aerogels composed of metal–organic frameworks (MOFs) derivatives and carbon fibers are ideal dynamic EMW absorption materials for intelligent EMW response.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Kang Li,Chenxi Li,Yisa Liu,Jiong Dong,Lili Xu,Yanran Li,Ruixin Ma,Shina Li
The widespread application of nuclear energy has increased the risk of contamination by radionuclide 137 Cs. Prussian blue analogues are considered to be excellent materials for the removal of 137 Cs from wastewater due to their unique structure. In this work, Cs + adsorbent for PBAs with Fe-Co framework, potassium iron hexacyanocobaltate (PBA Fe ), was synthesized by room temperature precipitation method. Systematic structural characterization and performance results of PBA Fe showed that it has a specific surface area of 452.8 m 2 /g and an average pore size of 8.6 nm, providing more active sites for Cs + . The adsorption of Cs + on PBA Fe exhibited fast reaction kinetics (within 10 min) and high adsorption capacity (82.90 mg/g), and the removal rate of Cs + reached 98.57 %. The efficient removal of Cs + by PBA Fe in various real water environments showed its excellent selectivity and potential for practical application. In addition, adsorption mechanism studies showed that the adsorption of Cs + was achieved by ion exchange with K + in the PBA Fe lattice. PBA Fe has the advantages of simple synthesis and good selectivity, and has potential application in the harmless treatment of Cs + in radioactive wastewater.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Bofang Zhou,Yiwei Chen,Wenqiang Tang,Xueyan Zhao,Haoliang Tao,Zhidong Chen,Chongxi Bao,Hongxia Zhang,Liangzhu Zhu
Replacing the ceramic support of a conventional solid oxide fuel cell (SOFC) with a metal support is an active research trend for improving the robustness of SOFC. We report metal-supported SOFC (M-SOFC) prepared based on Ni–Fe alloy supports with different Ni to Fe atomic ratios. The results show a Ni to Fe atomic ratio of 7:3 ratio has a more homogeneous and balanced microstructure and mechanical strength. Besides metal support selection, the type of cathode also plays a key role on improving the performance of a M-SOFC. In this study, we choose SSC and SDC as cathode materials and prepare composite cathodes containing different weight ratios of SSC to SDC, i.e., 3:7, 5:5, and 7:3 with a cathode sintering temperature of 950 and 1050 °C are compared as well. The combination of a Ni to Fe atomic ratio of 7:3, a SSC to SDC weight ratio of 5:5, and a cathode sintering temperature of 1050 °C yields the highest performance. The SSC-SDC55 cathode on symmetrical cell test shows a very low polarization resistance of 0.035 Ω cm 2 at 800 °C. A tested single-cell consisting layers of Ni–Fe|NiO-YSZ|YSZ|GDC|SSC- SDC achieved a maximum power density of 1.4 W cm −2 at 800 °C, reaching one of the highest performances for Ni–Fe supported M-SOFC, proving the advantages of using Ni–Fe alloy as support for M-SOFC. The stability of our Ni–Fe alloy supported M-SOFC still needs improvement.
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DESALINATION
·
2024
·
IF 8.3
You Zhou,Lei Xu,Sheng-Jie Han,Cai-Hua Liu,Yi-Bin Li,Ming-Lai Fu,Baoling Yuan
Solar-driven interfacial photothermal evaporation (SIPE) has been considered as a green and sustainable technology for obtaining fresh water, and the exploring efficient photothermal materials is crucial. Nanocomposite derived from metal-organic framework exhibits high light absorption properties and excellent chemical stability, making it an ideal candidate in the SIPE. Herein, Fe 3 O 4 /C nanocomposite was obtained using MIL-101 (Fe) as a precursor, and Fe 3 O 4 /C-based porous hydrogel (Fe 3 O 4 /C-PH) was subsequently prepared through chemical crosslinking foaming polymerization. The obtained Fe 3 O 4 /C-PH exhibited an evaporation rate of 3.33 kg m −2 h −1 under one sun intensity. Fe 3 O 4 /C-PH demonstrated outstanding desalination and salting out resistance when treating real seawater. Moreover, it could remove over 99 % of dyes from wastewater. The photothermal mechanisms are molecular thermal vibration of C component and semiconductor relaxation of Fe 3 O 4 . Meanwhile, the hydrophilic and porous skeleton structure of the hydrogel ensure Fe 3 O 4 /C-PH to transport water rapidly and exhibit good light absorption properties. This research broadens the candidate of photothermal materials for applications in SIPE, and also provides new avenues for desalination and wastewater purification.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 2
·1-13
·
IF 2.8
Hua Wanlu,Hu Chunyan,Xie Xiaoli,Gou Guangjun
The three-dimensional (3D) porous carbon materials are helpful for forming thin, light-weight, wide effective absorption bandwidth and strong absorption intensity absorbers. However, previous methods were not environmentally friendly enough. Thus, in this work, the Fe/Fe 3 C@porous carbon was synthesized from soluble starch and Fe(NO 3 ) 3 ·9H 2 O via chemical bowling and subsequent carbonization at 700 °C with different ratios. When the ratio of starch to Fe(NO 3 ) 3 ·9H 2 O is 1:1.5, the porous carbon exhibits a strong absorption ability with minimum reflection loss ( RL min ) value of −16.64 dB at 16.78 GHz, when the thickness is 1.75 mm and the proportion of paraffin wax is 30 wt%. The synergy of well impedance matching, sufficient loss performance, and interface polarization makes 3D porous carbon materials an excellent wave absorber. This work provides a good inspiration for studying outstanding performance microwave absorption materials.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Yihui Zhou,Jin Qian,Zhe Qiang,Weiqing Kong,Changhuai Ye,Meifang Zhu
Heterogeneous interfaces are crucial for enhancing the polarization loss in composite materials, thereby improving microwave absorption capabilities. However, creating well-defined multiple heterogeneous interfaces essential for optimal absorber performance presents a significant challenge. Herein, Fe/Fe 3 C@C magnetic-carbon composites featuring Fe-Fe 3 C-C multiple heterogeneous interfaces were fabricated through in-situ growth of Fe 3 O 4 on polydopamine nanospheres, followed by thermal reduction and carbonization. Owing to the controllable Fe-Fe 3 C-C multiple heterointerface design, the outer-layer magnetic components not only significantly improve impedance matching but also enhance the interface polarization loss. The optimized Fe/Fe 3 C@C-9–1 composite exhibits excellent microwave absorption performance, achieving a minimum reflection loss (RL min ) of −64.4 dB and a broad effective absorption bandwidth (EAB) of 6.0 GHz at a thin matching thickness of only 1.5 mm, surpassing neat carbon nanospheres and most magnetic-carbon materials. Additionally, simulations conducted using Computer Simulation Technology (CST) demonstrate that the Fe/Fe 3 C@C-9–1 coating significantly reduces radar cross-section (RCS), with values below −20 dB across nearly the entire frequency range of 2–18 GHz, highlighting its potential for radar stealth applications. This work provides a simple yet effective approach for tuning the interface properties of carbon-based materials, underscoring the promise of Fe-Fe 3 C-C multiple heterogeneous interfaces in the development of broadband, thin microwave absorbers.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yan Wang,Kangqi Cao,Wenlong Sun,Xiangxi Lin,Jianwei Wang,Jessica Villarreal,Longzhi Li
Microwave catalytic pyrolysis of lignin is one of emerging technologies for efficiently converting lignin into fuels and chemicals. Molecular sieves (HZSM-5) are widely used as carriers to load metallic components for biomass pyrolysis but often encounter challenges such as high diffusion resistance and insufficient acidity of acidic sites. Traditionally, HZSM-5 is directly modified to enhance the activity of the acidic sites, but this modification is ineffective in improving the metallic components’ activity. Instead, we made nitrogen doping on Fe and then supported on HZSM-5 to construct Fe-N 25 /HZSM-5 catalysts for microwave catalytic pyrolysis of lignin. The N-doped Fe has the effect of “killing two birds with one stone” on enhancing the catalytic activity. The characterization results indicated that N replaced C of the graphitic carbon network to form carbon nitride structure, and further combined with Fe to generate Fe-N bonds, improving the electronegativity of the metallic component. Besides, the loading of N-doped Fe increased the acidity of the catalyst. The utilization of 1.00Fe-N 25 /HZSM-5 obtained the greatest bio-gas yield (35.2 wt%), a hydrogen yield of 27.8 mL/min, bio-oil yield (36.4 wt%) and phenol selectivity of 46.2 %. The likely pathway of microwave catalytic pyrolysis on Fe-N 25 /HZSM-5 was proposed through DFT calculation, using guaiacol as a model compound. The results suggested that N-doped Fe on HZSM-5 8 T tended to break the side-chain methoxy during pyrolysis of guaiacol, with energy barrier of 0.14 eV. This paper provides a promising strategy for modification of microwave pyrolysis catalysts.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Min Wang,Shu Zhang,Qi Li,Yuanpeng Li,Enzhe Duan,Caimei Wen,Shujun Yu,Xiangxue Wang
Extracting uranium from seawater not only reduces radioactive contamination in seawater but also provides a source of uranium energy. However, due to the low concentration of uranium in seawater and the high salinity of seawater, extraction of uranium from seawater is challenging. In this work, we demonstrated a simple strategy to synthesize Fe-doped MXene (Fe@Ti 3 C 2 T x ) via a hydrothermal method and applied for uranium enrichment in seawater. The Fe@Ti 3 C 2 T x exhibited excellent adsorption performance in high salinity environments. The removal capacity of Fe@Ti 3 C 2 T x was determined to be 526.6 mg/g for UO 2 (CO 3 ) 2 2− at 328 K with quick reaction equilibrium (∼ 30 min). Kinetic and thermodynamic analyses of UO 2 (CO 3 ) 2 2− elimination process on Fe@Ti 3 C 2 T x surface revealed it to be a spontaneous and endothermic single-phase elimination process. FT-IR and XPS analyses further indicated that the removal mechanism of UO 2 (CO 3 ) 2 2− by Fe@Ti 3 C 2 T x was surface complexation. Our study suggests that Fe@Ti 3 C 2 T x can provide a feasible solution for uranium enrichment in seawater.
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PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Meiyang Hu,Xianwen Wang,Yajun Li,Sheng Zhong,Xuan Zhong,Rashid Khan,Jingzhe Zhao,Lu Huang,Yingpeng Wu
Constructing artificial SEI (ASEI) is an effective method to suppress dendrite growth and achieve a stable solid electrolyte interphase in a potassium metal anode. However, traditional methods for preparing ASEI still have some problems such as poor adhesion and inadequate/uneven reactions. These drawbacks significantly impede ion diffusion kinetics and the effectiveness of dendrite inhibition. In this study, an in situ reaction approach was introduced to fabricate a Fe-based protective layer on the surface of K via the spontaneous dynamic chemical reaction between Fe3O4 and K. The in situ-formed Fe-based artificial protective layer not only prevents the corrosion of the carbonate electrolyte, but also has high potassiophilicity and high ionic conductivity, which can reduce side reactions, regulate the uniform adsorption of K+, and improve the transport kinetics of K+, thus inhibiting the growth of potassium metal dendrites. With the Fe-based protective layer, the symmetric cell demonstrates a cycling stability exceeding 1700 h at 0.5 mA cm–2 and 0.5 mAh cm–2. Notably, it also exhibits a promising cycling stability and rate performance when paired with a Prussian blue (PB) cathode. This work offers insights into the development of protection layers for an advanced alkali metal anode.
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WATER RESEARCH
·
2024
·
IF 11.4
Haiyang Hu,Bingnan Song,Yang Lei
Phosphonates are widely used scale inhibitors, but the residual phosphonates in drainage are challenging to remove because of their chelating capacity and resistance to biodegradation. Here, we reported a highly efficient and robust Fe-electrocoagulation (Fe-EC) system for phosphonate removal. Surprisingly, we found for the first time that phosphonates like NTMP were more efficiently removed under anoxic conditions (80% of total soluble phosphorus (TSP) in 4 min) than oxic conditions (0% of TSP within 6 min) in NaCl solution. A similar phenomenon was observed when other phosphonates, such as EDTMP and DTPMP, were removed, highlighting the importance of iron complexation and floc formation toward phosphonate removal with Fe-EC. We also showed that the removal efficiency of NTMP by electrochemically in-situ formed flocs (97%) was much higher than post-adsorption systems (ex-situ, 40%), revealing that the growth of flocs consumed the active site for NTMP adsorption. Beyond the removal of TSP, 10 % of NTMP-P was also degraded after the electrolysis phase, evidenced by the evolution of phosphate-P. However, this did not happen in anoxic or chemical coagulation processes, which confirms the formation of reactive oxygen species via Fe(II) oxidation in the oxic Fe-EC system. The primary removal mechanism of phosphonates is due to their complexation with iron (hydr)oxide generated in the Fe-EC system by forming a Fe-O-P bond. Encouragingly, the Fe-EC system exhibits comparable or even better performance in treating phosphonate-laden wastewater (i.e., cooling water). Our preliminary cost calculation suggests the proposed system (€ 0.009/m 3 ) has a much lower OPEX under oxic conditions than existing approaches. This study sheds light on the removal mechanism of phosphonate and the treatment of phosphonate-laden wastewater by playing with the iron complexion and flocs formation in classical Fe-EC systems.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Futing Sun,Zesen Gao,Yan Yang,Haijie Chen
The halides have attracted much attention as novel solid electrolytes because of their easy synthesis, high electrochemical stability, and high ionic conductivities. However, the reported halides for solid electrolytes are still understudied compared with the oxides and sulfides. Here, we studied the Li–Fe–Cl phases that include Li2FeCl4 and Li6FeCl8. Using the self-doping approach, a maximum ionic conductivity of 2.0 × 10–4 S cm–1 at 50 °C was achieved for Li1.8Fe1.1Cl4. It was improved by 3 orders of magnitude compared with that of Li2FeCl4 (8.27 × 10–7 S cm–1 at 50 °C). For the Li|Li1.8Fe1.1Cl4|Li half-cell, it cycled for 2000 h at 50 °C under a current density of 0.01 mA cm–2, indicating an acceptable compatibility between Li2FeCl4 and Li. Finally, an all-solid-state battery was successfully assembled with Li1.8Fe1.1Cl4@LFP as the cathode, Li1.8Fe1.1Cl4 as the electrolyte, and a Li sheet as the anode. The initial specific charge capacity of the battery was 76.36 mAh g–1 at 0.1C and 50 °C. The initial Coulombic efficiency was 73.06%. This study suggests Li2FeCl4 as a new solid electrolyte, and the introduction of Li vacancies into the Li site is an efficient way to improve the electrochemical properties of halides.
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Small
·
2024
·Vol. 20
·期 34
·2401024
·
IF 13
Yuquan Wu,Da Lei,Jiawen Li,Ying Luo,Yuwan Du,Shi Zhang,Baiyi Zu,Yuhong Su,Xincun Dou
Exposing different facets on metal-organic frameworks (MOFs) is highly desirable to enhance the performance for various applications, however, exploiting a concise and effective approach to achieve facet-controlled synthesis of MOFs remains challenging. Here, by modulating the ratio of metal precursors to ligands, the facet-engineered iron-based MOFs (Fe-MOFs) exhibits enhanced catalytic activity for Fenton reaction are explored, and the mechanism of facet-dependent performance is revealed in detail. Fully exposed (101) and (100) facets on spindle-shaped Fe-MOFs enable rapid oxidation of colorless o -phenylenediamine (OPD) to colored products, thereby establishing a dual-mode platform for the detection of hydrogen peroxide (H 2 O 2 ) and triacetone triperoxide (TATP). Thus, a detection limit as low as 2.06 n m is achieved, and robust selectivity against a wide range of common substances (>16 types) is obtained, which is further improved by incorporating a deep learning architecture with an SE-VGG16 network model, enabling precise differentiation of oxidizing agents from captured images. The present strategy is expected will shine light on both the rational synthesis of nanomaterials with modulated morphologies and the exploitation of high-performance trace chemical sensors.
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