PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS
·
2019
·
IF 0.781
Xiaoling Yang,Ying Bai,Jiayun Li,Zinan Dai,Jiajian Peng
A novel iron-catalyzed hydrosilylation of alkenes process under solvent-free conditions has been reported. The influence of the amount of Fe catalyst, reaction temperature and various alkenes and silanes on the hydrosilylation were investigated. High yields of adduct were obtained in the hydrosilylation of octene with MeCl2H, Me2ClSiH and Ph2SiH2 by using 10 mol% iron powder as a signal catalyst.
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高影响因子
ADVANCED ENGINEERING MATERIALS
·
2024
·Vol. 26
·期 14
·2400527
·
IF 3.4
Rongjuan Zhang,Qi Hu,Shaobo Yang,Song Yan,Yaxin Gu,Jiawei Ji,Zheng Zhou,Chaoze Liu,Xinran Li,Zihao Wang,Chengchun Tang
The arrival of the 5 G era has brought great benefits to our lives, but it has also brought problems such as electromagnetic radiation. Therefore, the demand for lightweight, high-performance microwave absorbing materials with wide effective bandwidth is increasing. Herein, MIL-53/g-C 3 N 4 is first synthesized from precursors of ferric chloride, terephthalic acid, and g-C 3 N 4 , and then thermally annealed at different temperatures to generate MOF-Fe@C nanocomposites. Heat treatment can effectively carbonize g-C 3 N 4 to amorphous carbon and reduce iron in MIL-53 to magnetic Fe and Fe 3 O 4 nanoparticles through carbon-thermal reduction reaction. The synergistic effect of dielectric loss of amorphous carbon and magnetic losses of magnetic particles enhances attenuation and improves impedance matching, enhancing microwave absorption. The RL min of MOF-Fe@C(4)-700 is as low as -72.78 dB at 9.44 GHz at a thickness of 3.18 mm and its effective absorption bandwidth is as broad as 4.88 GHz, covering most of X-band frequency range. The research introduces a novel technique for synthesizing absorbers with controllable electromagnetic characteristics by incorporating g-C 3 N 4 as carbon sources into MOF materials.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Qiangshun Wu,Hanpei Yang,Li Kang,Zhao Gao,Feifan Ren
In this work, a series of Fe-based metal-organic frameworks (Fe-MOFs) were synthesized and served as Fenton-like catalysts for tetracycline hydrochloride (TC–HCl) degradation. Herein, for the first time, we have demonstrated that visible light can accelerate Fe(II)/Fe(III) cycle in the photo-Fenton system based on iron-oxo (Fe-O) clusters in frameworks. Among these Fe-MOFs, MIL-101 possessed the highest activity mainly ascribed to its largest specific surface area and pore volume, and the most coordinatively unsaturated iron sites. The synergistic effect in the MIL-101/H 2 O 2 /visible light system was derived from the efficient separation and migration of photogenerated carriers. Due to the function of solid acid catalysts, MIL-101 extended effective pH range up to 10.2 and exhibited good reusability and stability. Hydroxyl radicals generated from H 2 O 2 coordinated at iron active sites were determined as the main reactive oxidative species and acceleration of Fe(II)/Fe(III) cycle was responsible for highly effective degradation of TC–HCl.
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Materials Today Chemistry
·
2026
·
IF 7.4
Yu Xia,Aiping Wang,Qiao Hu,Guangming Han,Kaidi Gao,Yangyang Gao,Ruize Wang,Yongqi Wang,Jianfeng Yao
A well-designed Fe-N dual sites amino-functionalized (MIL-101(Fe)-NH 2 ) separator is fabricated. • The unsaturated Fe sites in the MOF act as strong anionphilic modifiers to adsorb PF 6 − . • The polar -NH 2 groups act as Lewis's base sites to enhance electrolyte wettability. • The synergistic Fe-N sites induce the formation of a stable solid electrolyte interphase. • This separator can regulate lithium deposition and enable high-performance lithium metal batteries. Lithium-based batteries utilizing metallic lithium anodes have attracted widespread research interest due to their exceptional theoretical energy density. However, the growth of dendritic lithium structures, unstable solid electrolyte interphase (SEI) and associated safety concerns pose substantial obstacles to their commercial application. Traditional polypropylene (PP) separators suffer from poor electrolyte affinity and electrochemical inertness, causing heterogeneous Li + distribution and severe interfacial polarization. Herein, an amino-functionalized MIL-101(Fe)-modified PP separator is successfully developed to regulate Li deposition through the synergistic effects of Fe-N dual active sites. The unsaturated Fe sites in the MOF act as strong anionphilic modifiers to adsorb PF 6 − and suppress anion migration; the polar -NH 2 groups act as Lewis's base sites to enhance electrolyte wettability and accelerate ion transport. These synergistic Fe-N sites induce the in-situ formation of a stable LiF/Li 3 N-rich and flexible inorganic-organic hybrid SEI, preventing the penetration of dendritic lithium. Electrochemical testing reveals that the Li|Li symmetric cells achieve more than 650 h of uniform lithium deposition and also stable cycling at elevated temperatures. Furthermore, the LiFePO 4 |Li cells and the LiFe 0.5 Mn 0.5 PO 4 |Li cells employing this modified separator demonstrate superior cycling stability and enhanced rate capability. Modifying separators with functionalized metal-organic frameworks (MOFs) presents a plausible strategy to improve the performance of electrochemical batteries, contributing to an in-depth discussion of the application of MOFs in lithium battery technology. Amino-functionalized separators (PP@MIL-101-NH 2 ) are successfully designed to regulate ion transport for high-performance lithium metal batteries. The unsaturated Fe sites in the MOF act as strong anionphilic modifiers to adsorb PF 6 − ; the polar -NH 2 groups act as Lewis's base sites to enhance electrolyte wettability. Synergistic Fe-N sites induce the formation of a stable LiF/Li 3 N-rich solid electrolyte interphase, preventing the penetration of dendritic lithium. Download: Download high-res image (365KB) Download: Download full-size image
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RARE METALS
·
2026
·Vol. 45
·期 5
·e70350
·
IF 12.1
Lijuan Wang,Jie Hou,Wubo Wan,Yongjie Mo,Zhijian Liao,Shengkui Zhong,Linhua Zhu
en This link goes to a English section zh This link goes to a Chinese section Atomically dispersed iron–nitrogen–carbon (Fe-N-C) catalysts have emerged as promising alternatives for oxygen reduction reaction (ORR) owing to their highly atomic utilization. However, maintaining both Fe atomic dispersion and dense Fe-N x sites (typically below 2 wt%) in Fe-N-C catalysts is still a key challenge. In this investigation, a template (1,2-dicyanobenzene; DCB) assisted strategy has been reported to achieve hierarchically porous Fe-N/C DCB0.2 -900°C catalysts, which have atomically dispersed Fe-N 4 C active sites with a 5.45 wt% Fe loading and served for robust ORR. 1,2-dicyanobenzene containing abundant nitrogen source not only efficiently enhances the coordinated environment for dense Fe sites, but also facilitates the formation of a hierarchical porous structure in Fe-N/C DCB0.2 -900°C catalyst. Computational analysis demonstrated that template-assisted structural modification effectively reduces the energy barrier associated with *OOH intermediate formation while simultaneously adjusting the d-band center position of Fe-N 4 C coordination sites within the Fe-N/C DCB0.2 -900°C system. This optimization enhances the stabilization of oxygen-bearing intermediates and promotes accelerated kinetics of the ORR. Consequently, the Fe-N/C DCB0.2 -900°C exhibited a half-potential of 0.9 V versus RHE when evaluated in 0.1 M KOH electrolyte and achieved a peak power density of 220 mW cm −2 in a zinc–air battery, surpassing commercial Pt/C (0.88 V vs. RHE, 194 mW cm −2 ). Such methodology provides a new avenue for constructing dense metal active sites for achieving functional, but not limited to, ORR, catalysts and applications. 摘要 en This link goes to a English section zh This link goes to a Chinese section 原子分散的铁-氮-碳(Fe-N-C)催化剂因其高原子利用率,已成为很有前景的氧还原反应(ORR)替代催化剂。然而,在Fe-N-C催化剂中同时保持铁的原子分散性和密集的Fe-N x 位点(通常低于2 wt%)仍是一个关键挑战。在本研究中,我们报道了一种模板(1,2-邻苯二甲腈; DCB)辅助策略,以制备具有分级多孔结构的Fe-N/C DCB0.2 -900°C催化剂,该催化剂具有原子分散的Fe-N 4 C活性位点,铁负载量为5.45 wt%,可用于高效的ORR。含有丰富氮源的1,2 -邻苯二甲腈不仅能有效改善密集铁位点的配位环境,还有助于在Fe-N/C DCB0.2 -900°C催化剂中形成分级多孔结构。理论计算分析表明,模板辅助的结构修饰有效降低了与*OOH中间体形成相关的能垒,同时调整了Fe-N/C DCB0.2 -900°C体系中Fe-N 4 C位点的d带中心位置。这种优化增强了含氧化合物中间体的稳定性,并促进了ORR的动力学反应速度。因此,在0.1 M KOH电解质中测试时,Fe-N/C DCB0.2 -900°C的半波电位为0.9 V,在锌空气电池中实现了220 mW cm −2 的峰值功率密度,超过了商用Pt/C(0.88 V,194 mW cm −2 )。这种方法为构建密集的金属活性位点提供了新途径,可用于制备功能性催化剂(不仅限于ORR)及相关应用。
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Journal of Materials Chemistry A
·
2026
·
IF 9.2
Hamza M. Haruna,Yanxiang He,Zhixiao Zhu,Hao Yang,Selvam Mathi,Guanhua Zhang,Zhongmin Wang,M. Sadeeq Balogun
Controlling phase evolution during nitridation is essential for creating active interfaces in multi-metal electrocatalysts. However, the nitridation pathways in complex systems such as Mo-Fe-Ni molybdates remain poorly defined. Herein, tuning the Fe contents in the Fe-Mo precursor directly governs ammonia activation and drives nitridation-induced reconstruction. Increasing Fe concentration promotes NH3 decomposition, shifting the product from an oxide-rich phase (N-doped MoO2-FeMoO4-NiMoO4-NiO, denoted N/MoO2-MoFeNi-O) to a nitride-dominated heterostructure comprising MoO2, Mo2N, FeN and Ni4N (N/MoO2-MoFeNi-N). The optmized N/MoO2-MoFeNi-N nitride-oxide interfaces enhance electrical conductivity, optimize oxygen-intermediate adsorption, and improve corrosion resistance. As a result, N/MoO2-MoFeNi-N exhibits superior oxygen evolution performance in both alkaline freshwater and seawater, requiring overpotentials of only 309/392 and 334/499 mV to reach 500 and 1000 mA cm-2, respectively. DFT calculations identify the MoO2@FeN interface is the most active site with the lowest energetic barrier for the potential-limiting step. The catalyst also demonstrates efficient oxygen reduction activity, enabling high-performance zinc-air batteries with open-circuit voltage of 1.33 V, peak power density of 84.2 mW cm-2, and stable cycling over 140 h. This work clarifies the role of Fe in directing nitridation pathways, providing a rational route to construct durable, interface-rich nitride-oxide architectures for advanced oxygen atalysis.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wenqiang Cao,Xiyu He,Xiyang Cai,Qiaodan Hu,Junliang Zhang,Fan Yang
Electrocatalytic nitrate reduction offers a sustainable approach to ammonia synthesis while simultaneously addressing nitrate contamination. Electrocatalysts with high activity, long durability and affordable cost are essential for advancing this field. This study demonstrates that Fe-doped TiO 2 nanoparticles synthesized by a simple hydrothermal route exhibit competitive electrocatalytic performances for nitrate-to-ammonia conversion. A faradaic efficiency (FE) of 82.3 %, an ammonia yield of 5.953 mg·cm −2 ·h −1 , and a selectivity of 85 % can be achieved and maintained in 10 cycles with a total duration of 60 h in alkaline electrolyte. These metrics substantially outperform the pristine TiO 2 . Defect chemistry analysis and DFT calculations reveal that Fe doping creates oxygen vacancies, and introduces impurity energy levels in the bandgap to improve the electrical conductivity of TiO 2 . Fe and oxygen vacancies synergistically modulate the nitrate adsorption energy, and the Fe active site further reduces the energy barrier for the rate-limiting step and suppresses the competing reactions, thereby effectively promoting ammonia synthesis.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 9
·092522
·
IF 4.386
Jian-Ru Li,Cun-Ying Xu,Jing-Ling Lu,Shu-Xian Wang,Xiao Chen,Qin-Qin Xiang,Yi-Xin Hua
The electrodeposition behavior of Fe was studied in phenyltrimethylammonium chloride-ethylene glycol eutectic-based ionic liquids (TMPAC-EG EILs) containing FeCl2 through electrochemical measurement and the deposit characterization. Some kinetic parameters (standard rate constants, transfer coefficients and activation energy for standard rate constants) as well as transport properties were obtained and discussed as function of temperature. The values of transfer coefficient (0.32–0.39) are significantly lower than conventional value (0.5). Electrodeposition of Fe follows three-dimensional progressive nucleation and growth mode, which is unaffected by temperature. Besides, it is found that deposition temperature plays a central role in controlling surface morphology and structure of the resultant Fe coatings. At low temperature (333–353 K), smooth and dense iron coating can be obtained. The phase structure changes from a nanocrystalline α-Fe to amorphous phase (metallic glass) as the deposition temperature increases from 333 K to 353 K.
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Advanced Science
·
2021
·Vol. 8
·期 22
·2101824
·
IF 16.806
Jun Wang,Bin Li,Yang Li,Xiaobin Fan,Fengbao Zhang,Guoliang Zhang,Wenchao Peng
Fenton-like reactions with persulfates as the oxidants have attracted increasing attentions for the remediation of emerging antibiotic pollutions. However, developing effective activators with outstanding activities and long-term stabilities remains a great challenge in these reactions. Herein, a novel activator is successfully synthesized with single iron atoms anchored on porous N-doped carbon (Fe-N-PC) by a facile chemical vapor deposition (CVD) method. The single Fe atoms are coordinated with four N atoms according to the XANES, and the Fe-N 4 -PC shows enhanced activity for the activation of peroxymonosulfate (PMS) to degrade sulfamethoxazole (SMX). The experiments and density functional theory (DFT) calculations reveal that the introduction of single Fe atoms will regulate the main active sites from graphite N into Fe-N 4 , thus could enhance the stability and tune the PMS activation pathway from non-radical into radical dominated process. In addition, the N atoms connected with single Fe atoms in the Fe-N 4 -C structure can be used to enhance the adsorption of organic molecules on these materials. Therefore, the Fe-N 4 -C here has dual roles for antibiotics adsorption and PMS activation. The CVD synthesized Fe-N 4 -C shows enhanced performance in persulfates based Fenton-like reactions, thus has great potential in the environmental remediation field.
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PubMed
高影响因子
Chemical Engineering and Processing-Process Intensification
·
2021
·
IF 4.237
Dicka Ar Rahim,Wei Fang,Gaojun Zhu,Haryo Wibowo,Dwi Hantoko,Qing Hu,Herri Susanto,Zengliang Gao,Mi Yan
Before syngas from gasification of biomass could be used as synthesis fuel or chemical feedstock, it requires the removal of hydrogen sulfide (H 2 S) to meet the purity standard level of those applications. In this study, Zn-Fe/Al 2 O 3 were successfully synthesized by a microwave-assisted wet incipient impregnation technique for use as adsorbent for H 2 S removal. The characterization of synthesized adsorbents showed that the oxide form of Zn and Fe present on the surface of adsorbents were zinc oxide (ZnO), magnetite (Fe 3 O 4 ), and zinc ferrite (ZnFe 2 O 4 ). While the reduction of adsorbent was mostly due to that of iron oxide . The reduced adsorbents might consist of ZnO/Fe 3 O 4 /FeO/Fe on alumina as support. At relatively high space velocity (26,000 h −1 ) the adsorbents were able to reduce the H 2 S concentration from 250 ppm at the inlet to around 45 ppm, 35 ppm, and 25 ppm at the outlet by adsorbent 1ZnFe, 2ZnFe, and 3ZnFe; respectively. The removal efficiency for adsorbent 1ZnFe, 2ZnFe, and 3ZnFe were 82%, 86%, and 90%; respectively. Results also shown an increase in adsorbent lifetime with the increase of the Zn to Fe ratio.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Ziyi Xiao,Rui Wu,Tingting Shu,Yingxi Wang,Ling Li
In order to further improve the catalytic performance of MIL-101, cobalt-doped MIL-101(Fe,Co) was synthesized by solvothermal method. By adjusting the ratio of cobalt doping, the MIL-101(Fe,Co 20% ) with the best catalytic activity was obtained. The activation performance of MIL-101(Fe,Co 20% ) for peroxymonosulfate (PMS) was studied using Rhodamine B (RhB) as a pollutant model. The experimental results proved MIL-101(Fe,Co 20% ) with much better catalytic performance than MIL-101(Fe), which can degrade more than 99% of RhB within 15 min. The effects of initial solution pH and coexisting anions in water on the degradation of RhB were further discussed. The results showed that MIL-101(Fe,Co 20% ) was with excellent stability and degradation efficiency can still keep above 90% after five cycles. The free radical quenching experiments were further studied to explore the degradation mechanism. It can be concluded that SO 4 - · was the main active free radical for the degradation of RhB. The possible intermediate products in the degradation process of RhB were analyzed by LC-MS. Combined with the comparison of XPS before and after the reaction, the possible reaction mechanism of RhB degradation process was inferred.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Zibin Pan,Zhengxian Chen,Gary Owens,Zuliang Chen
Biosynthesis strategies are promising methods for the sustainable preparation of nanoparticles because they are less toxic to living organisms and the environment. However, there are still several knowledge gaps concerning the exact mechanisms involved in the biosynthesis of bimetallic composites when used for the removal of arsenic species. Thus, this work focused on the biosynthesis mechanism involved in the formation of a Fe/Cu bimetallic bio-composite (Fe/Cu-OC), and determination of the specific biomolecules in tea extract involved in biosynthesis, and identification of the reactive sites involved in the removal of As(V). FTIR , XPS, GC-MS, and LC-MS analysis of the main components of the tea extract proved that the surface of Fe/Cu-OC contained many different functional groups, including -OH, Fe/Cu-O, and O C-OH, which were mainly associated with theanine and caffeine complexes. SEM and TEM analyses indicated that Fe/Cu-OC had both crystalline and amorphous features with an average particle size of 366 ± 10 nm. A 97 % removal efficiency for As(V) was obtained by Fe/Cu-OC, suggesting that the surface contained numerous reactive sites, including unsaturated Fe and Cu complexes, as well as saturated benzene rings. Moreover, DFT calculations indicated that the Gibbs free energy changes for the preparation of Fe/Cu-OC were < 0, suggesting that in the composites biosynthesis was a thermodynamically favored spontaneous reaction. A biosynthetic mechanism for the formation of Fe/Cu-OC was proposed, involving a series of spontaneous coordination, redox, and organic adsorption reactions.
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