Journal of Physical Chemistry C
·
2024
·
IF 3.3
Caiyi Jiang,Ming Hou,Li Yang,Shenghui Guo,Guo Yang,Bo Xing,Yi Wang,Dongzheng Wang,Xiaolin Shi
Fe–N co-doped carbon catalyst has received increasing attention in the field of organic wastewater treatment because of its unique structure and outstanding activity. However, the reusability, catalytic activity, and pH working range are still a great challenge for future application. Herein, a novel αFe-HM@C-T catalyst was prepared by pyrolyzing a mixture of starch and heme and was analyzed by TEM, H2-TPR, XRD, BET, XPS, FTIR, and Raman spectrum. Meanwhile, αFe-HM@C-T catalysts show the highest catalytic performance due to abundant porous structure, higher redox property, and unique Fe–Nx configuration. The rhodamine B (RhB) could be almost completely degraded within 30 min on the 5Fe-HM@C-850, and recovery rates of catalytic activity of 96% and 91.8% were achieved in peroxydisulfate (PDS) and H2O2 systems with an extensive buffer pH range. Furthermore, mechanistic insights by quenching experiments and EPR verified the high removal efficiency of RhB mainly attributed to indirect oxidation of SO4•–, •OH, and 1O2 in both systems, and the potential mechanism was proposed.
研究领域:
环境科学
·
催化材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Chen Qiao,Zahid Usman,Tai Cao,Souleymen Rafai,Zhitao Wang,Youqi Zhu,Chuanbao Cao,Jiatao Zhang
High-valence Ni and Fe metal sites have demonstrated a crucial role in enhancing the catalytic performances of NiFe-LDH electrocatalysts in oxygen evolution reaction (OER). Although considerable OER catalytic performances achieved under high overpotential, the catalytic talent of NiFe-LDH electrocatalysts at low overpotential is rarely realized due to the absence of high-valence Ni and Fe sites. We herein report a surface engineering route to fabricate sulfated NiFe-LDH nanosheets via ion exchange strategy in sulfate-rich media. XPS results reveal a modified surface electronic structure with high-valence Ni and Fe after ion exchange reaction. Computational PDOS results suggest that computed d-band centers (ε d ) of Fe and Ni for sulfated NiFe-LDH show a significant downward shift resulting an increased valence of metal cation with orbital volume shrinkage. The high-valence Fe can facilitate a optimized multi-electron process of Ni center from [Ni II -OH] − /[Ni III -OH] − to Ni IV -OOH rather than Ni II /Ni III to Ni IV at low overpotential. The high-valence Ni can serve as the highly active center for O-O coupling during OER process. Combined with the synergetic action of high-valence Fe and Ni, the sulfated NiFe-LDH nanosheets exhibit much larger reaction kinetics and outstanding electrocatalytic activity on glassy carbon electrode (η 10 = 219 mV, η 50 = 288 mV) with a remarkable long-term stability.
研究领域:
材料科学
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电化学
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催化科学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 25
·1-15
·
IF 2.8
Yan Yuefeng,Cheng Ziyan,Ma Guansheng,Chen Tao,Gao Boshi,Liu Yuhao,Huang Xiaoxiao
Reduced Graphene Oxide (RGO) has been proved to be a promising electromagnetic wave absorption (EMWA) material candidate owing to its superior electrical and dielectric properties, along with rich potential for structural design. However, the complicated synthesis process and the contradiction between impedance matching and attenuation capacity have hindered the further development and application of graphene-based absorbing materials. Herein, a Fe nanoparticle/RGO composites was synthesized through a facile in-situ chemical reduction process. The configuration of Fe nanoparticles regulates the permittivity and permeability of RGO and balances the impedance matching. The dipole polarization caused by the residual oxygen-containing functional groups in RGO, coupled with the interfacial polarization loss caused by the Fe/RGO interface, enhance the dielectric loss capacity, contributing to microwave loss in the high-frequency range. The natural resonance and exchange resonance caused by the nano Fe particles enhance the microwave loss capacity in the low-frequency range. Benefitting from the synergistic enhancement from dielectric loss and magnetic loss, Fe/RGO composites exhibit the characteristic of daul-band absorption. Notably, the sample FG-0.25 achieved an effective absorption bandwidth ( EAB ) of 5.33 GHz and a minimum reflection loss ( RL min ) of −48.9 dB. The absorption peaks in the low-frequency band can encompass a significant portion of the C-band. This research provides unique insights for the advancement of environmentally friendly and energy-efficient RGO based EMWA materials.
研究领域:
材料科学
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电磁波吸收
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纳米复合材料
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微波吸收材料
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Xiaohui Wang,Zhilong Cheng,Bingrong Liu,Huiyi Liu,Xin Fang,Ruiqi Chai,Lishuang Ma,Yuchao Lyu,Jianye Fu,Xinmei Liu
Methane dehydroaromatization (MDA) was a promising technology for the synthesis of high value-added aromatics through natural gas. Fe/ZSM-5 catalysts were widely used in MDA reaction. However, its catalytic mechanism remained ambiguous. In this work, a novel one-pot strategy was developed for the preparation of Fe/ZSM-5 catalysts, which can delicately control the iron species and acidic property of Fe/ZSM-5 catalysts. In-situ DRIFTS and DFT calculation demonstrated that MDA followed a bifunctional mechanism and the second C–H bond breaking process of CH 4 was the rate-determining step, where methane underwent coupling and dehydrogenation at the iron active sites to generate intermediate species (ethylene), and Brønsted acid sites played a key role in determining the selectivity of aromatics. Moreover, CO-pulse chemisorption revealed the quantitative synergistic effect between metal active sites and Brønsted acid sites. Catalysts with highly dispersed iron oxide and proper density of Brønsted acid sites exhibited the best catalytic performance. This study elucidated the catalytic roles of iron species and Brønsted acid sites in Fe/ZSM-5 catalysts in MDA and provided guidance for the future development of highly active MDA catalysts.
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产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Nanqing Zhang,Xianhua Bian,Zhenglong Zhu,Xin Huang,Ping-an Yang
To effectively absorb electromagnetic waves and reduce the impact of electromagnetic radiation on the health of residents and the normal operation of electronic devices, core-shell nanocomposite fibers (Fe NWs@SiO 2 @Ag) were successfully prepared by the liquid-phase hydrolysis method. The microwave absorption properties of core-shell nanocomposite nanofibers with different ratios were tested and analyzed using the coaxial method. The results show that the sample with a molar ratio of Fe:SiO 2 :Ag of 1:0.1:1 has the best comprehensive performance. This sample exhibits excellent microwave absorbing performance. When the mass filling fraction is 25 wt%, its minimum reflection loss (RL min ) can reach −61.55 dB, and the effective absorption bandwidth (EAB) can reach 3.52 GHz. The excellent microwave absorbing performance can be attributed to the interfacial polarization effect of the core-shell nanocomposite structure, the magnetic loss and conduction loss of each layer of materials, and the small-scale effect caused by the one-dimensional structure. This study can provide a methodological reference for the preparation of high-performance absorbing materials.
研究领域:
材料科学
·
纳米技术
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电磁学
·
微波工程
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产品关联
DOI
高影响因子
Materials Today Physics
·
2021
·
IF 9.298
A. Wang,Y. Hu,H. Wang,Y. Cheng,T. Thomas,R. Ma,J. Wang
To improve the structure-dominant activity, rational design of oxide-based materials remains challengeable in bifunctional oxygen electrocatalysis , especially from the perspective of electronic modulation. Herein, we demonstrate that the electron configuration of inverse spinel NiCo 2 O 4 can be activated by controllable substitution of Fe into the octahedral centers. Fe-substituted NiCo 2 O 4 nanoparticles embedded in porous N-doped carbon nanofibers (NiCo 2- x Fe x O 4 /NCNF), which were synthesized by scalable electrospinning, exhibit a correlated relationship with Fe atomic content and achieve an optimal bifunctional activity (ΔE = 0.74 V) at 0.25 at.%. Theoretical calculation shows that the substitution of Co 3+ by Fe 3+ modulates the electrons filling in e g orbital of octahedral cation via delocalizing the electrons around O anions. The increased density of states around the Fermi level further regulate the adsorption energy of oxygen intermediates and lead to better bifunctional performance than commercial Pt/C + RuO 2 in rechargeable Zn-air battery. This work provides a new pathway to develop cost-effective bifunctional electrocatalysts for electrochemical energy storage and conversion .
研究领域:
材料科学
·
电化学
·
储能与转换
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Fawen Liang,Zhang Liu,Xueding Jiang,Jiesen Li,Kaibang Xiao,Weicheng Xu,Xin Chen,Jinzhi Liang,Zhifeng Lin,Meng Li,Xiaolian Wu,Hailong Wang
In this study, NaOH-modified biochar supported Fe/Mn bimetallic composite (Fe-Mn/AW-BC) was prepared to remove tetracycline (TC) through activating peroxymonosulfate (PMS). Results showed that about 97.9 % of TC was degraded and the rate constant of Fe-Mn/AW-BC + PMS system was 37 folds higher than BC + PMS system. Experimental results confirmed that both radical and non-radical pathway were contribute to the catalytic system. Density functional theory (DFT) results also suggested that Fe-Mn/AW-BC sample was favorable for adsorbing PMS based on the length O O bond from PMS and the E ads of catalysts. The superior activation ability was ascribed to the accelerating formation of reaction active species and other oxidation species by bimetallic structures of Fe-Mn and oxygenated functional groups of BC. Additionally, the redox cycles of Fe 3+ /Fe 2+ and Mn 3+ /Mn 2+ under Fe-Mn-BC synergism promoted the generation of the radicals, whereas the carbon shell effectively inhibited metals leaching of Fe-Mn/AW-BC, and 77.8 % of TC can be still removed within 60 min after five consecutive cycles. Notably, Fe-Mn/AW-BC system has special characteristic of wide pH usable range and broad-spectrum adaptability towards various organic pollutants and various water environments. Based on intermediate identification and Fukui function calculation, the degradation pathways of TC were also proposed. This study highlights the applications of biochar for the environmental catalysis.
研究领域:
环境科学
·
催化材料
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Kuangfu Huang,Ruohao Dong,Chao Wang,Wen Li,Hongxia Sun,Baoyou Geng
Design and synthesis of highly efficient, stable, and low-cost catalysts have a crucial role in the study of electrolytic water. In this work, a novel Fe–Ni layered double hydroxide (LDH) material with homogeneous heterostructures is successfully synthesized by a two-step hydrothermal method. Compared with the ordinary Fe–Ni LDH arrays prepared by one step, this structure has a rougher surface, so it has a more extensive active area, thus providing more active sites. Due to the synergistic effect of different elements and more exposure of active sites, the catalytic effect of this material for water splitting is outstanding. The post-optimized FeNi@FeNi electrode exhibits extraordinary OER (oxygen evolution reaction) and HER (hydrogen evolution reaction) performance with OER overpotentials of 193, 231, and 306 mV and HER overpotentials of 127, 173, and 253 mV when the current density is 10, 20, and 50 mA·cm–2, respectively. The improved electrolytic water performance reveals that the design of homogeneous heterostructures is maybe an alternative route to exploit high-efficiency catalysts and promote the application of nonprecious metal catalytic materials.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2021
·Vol. 23
·期 8
·4690-4699
·
IF 3.676
Zhengyan Zhao,Wei Liu,Yantao Shi,Heming Zhang,Xuedan Song,Wenzhe Shang,Ce Hao
We report a combination of experimental and computational mechanistic studies for the photoreduction of CO2 to CO with water, catalyzed by single-atom Fe supported on graphitic carbon nitride (g-C3N4). Density functional theory (DFT) and time-dependent DFT (TDDFT) methods were utilized to explore the behavior of single-atom Fe in g-C3N4, which is of vital importance to the understanding of the CO2 reduction reaction (CO2RR) mechanism. The calculation results reveal that the rate-limiting step of the hydrogen-bonded complex in the absence of Fe atoms is the cleavage of C–O bonds in COOH radicals during the whole CO2RR, which includes the photophysical and photochemical processes. The presence of Fe atoms not only activated CO2 in the ground state and increased the rate constant of the limiting step in the photophysical process, but also functioned as the catalytic active center, lowering the reaction barrier of the C–O bond cleavage in COOH˙ in the photochemical process and resulting in improved photocatalytic activity. In addition, DFT calculations further demonstrated that the electron and proton transfer involved in the photophysical and photochemical processes is closely related to and induced by the hydrogen bonds in the excited state.
研究领域:
材料科学
·
催化化学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Yuelong Xu,Ran Wang,Jingyue Wang,Yaru Zhang,Tifeng Jiao
Hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and oxygen reduction reaction (ORR) serve as the most promising electrochemical processes for renewable energy. Developing multifunctional electrocatalysts with high performance for HER, OER and ORR still remains a challenge. Herein, we report a facile method to prepare P, N-co-doped porous carbon encapsulated Fe-CoP (A-Fe-CoP/CPN) electrocatalyst through freeze drying, carbonization, and KOH activation. The acquired A-Fe-CoP/CPN possesses abundant pores with large surface area, which provides sufficient defect-rich sites for HER, OER, and ORR, in alkaline or acidic electrolytes. The A-Fe-CoP/CPN shows low overpotential and good stability for HER and OER in alkaline electrolyte. Density functional theory (DFT) computations reveal that the addition of Fe greatly facilitates the rate-determining step and overall catalytic pathway for both HER and OER. A-Fe-CoP/CPN also exhibits low half-wave potential ( E 1/2 ) for ORR, which indicates an enhanced performance than that of the noble Pt/C catalyst. Zn-air battery equipped with the A-Fe-CoP/CPN catalyst exhibits a high energy density (849 mAh g −1 ) and a long-time stability at 5 mA cm −2 . This finding not only offers a facile strategy to prepare porous carbon materials with defect-rich sites, but also provides guidance for developing multifunctional electrocatalysts for wide electrochemical reactions.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2025
·
IF 4.6
Feijin Zhou,Wenying Cui,Chenggang Liu,Cheng Yao,Chan Song
The excessive presence of S 2− poses siganificant risks to human health and the environment. Therefore, the development of novel S 2− sensing methods remains crucial in daily life. Herein, Fe–N hollow mesoporous carbon nanospheres (Fe–N HMCNSs), characterized by a high specific surface area and excellent stability, were successfully prepared. Further investigation revealed that the colorimetric substrates such as 2,2′-azino-bis(3-ethylbenzthiazoline-6-sulphonate) (ABTS), o-phenylenediamine (OPD), and 3,3′,5,5′-tetramethylbenzidine (TMB), can be effectively oxidized by Fe–N HMCNSs into colored products. Based on the oxidase-like activity of Fe–N HMCNSs, a facile colorimetric method for S 2− assay was constructed for the first time. The recognition of S 2− could be fulfilled by recording the absorbance intensity and observing color changes in nanozymes-based catalytic systems. This method is simple, cost-effective, and environment-friendly, offering a wide linear range (0.25–25 µM) and a low detection limit (42.2 nM) for S 2− assay. Furthermore, integration of smartphone-based RGB analysis enabled the portable and convenient S 2− sensing using the developed colorimetric sensor. The remarkable stability of Fe–N HMCNSs under harsh conditions endows their potential applications in the fields of food safety and environmental protection.
研究领域:
环境科学
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Mian Li,Lian-Yu Qiu,Tian-Yang Zhang,Bin Xu,Dan Yang,Ting Ye,Heng Luo
Advanced oxidation processes (AOPs) based on Fe 2+ /persulfate (PS) have been widely applied in water treatment but face critical challenges: inefficient radical utilization due to excess Fe 2+ scavenging, unsustainable reactivity from irreversible Fe 2+ -to-Fe 3+ conversion, and ambiguous dominant reactive species (e.g., SO 4 − / OH vs. high-valent iron). Ferric oxalate complexes address these limitations by enabling light-driven iron photoreduction and the Fe 2+ /Fe 3+ cycle. However, direct comparisons of degradation efficiency, mechanisms, and environmental risks between Fe 2+ /PS and UV/Fe(C 2 O 4 ) 3 3− /PS remain scarce. Using iohexol as a model, this study directly compared the two systems. The UV/Fe(C 2 O 4 ) 3 3− /PS system achieved 98.8 % iohexol degradation in 60 min (vs. 69.9 % for Fe 2+ /PS) and reduced iron sludge by 70–80 %. Both systems relied on SO 4 − and OH, but UV/Fe(C 2 O 4 ) 3 3− /PS enhanced radical yield via photocatalytic iron cycling, whereas Fe 2+ /PS depended on Fe(IV). In Fe 2+ /PS, contributions were Fe(IV) (29.4 %) > SO 4 − (25.9 %) > OH (20.2 %); in UV/Fe(C 2 O 4 ) 3 3− /PS, SO 4 − (63.6 %) > OH (23.7 %) > Fe(IV) (23.7 %). Electrical energy per order (EE/O) analysis showed UV/Fe(C 2 O 4 ) 3 3− /PS consumed 1.166 kWh mM −1 , 60.2 % lower than Fe 2+ /PS (2.524 kWh mM −1 ). Acute toxicity tests with Vibrio fischeri exhibited 67.7 % inhibition in Fe 2+ /PS, significantly higher than 36.4 % in UV/Fe(C 2 O 4 ) 3 3− /PS. Ecological Structure-Activity Relationships (ECOSAR) modeling and disinfection by-products (DBPs) risk assessment further confirmed lower risks in UV/Fe(C 2 O 4 ) 3 3− /PS, with 50 % lethal concentration ((LC 50 ) for aquatic organisms 2.3-fold higher and genotoxicity potency 41.7 % lower than Fe 2+ /PS. These results bridge the efficiency-risk gap between the two systems and offer a three-dimensional (efficiency-cost-safety) framework for AOP selection.
研究领域:
环境工程
·
水处理
·
化学氧化
·
毒理学
·
自由基化学
·
污染控制
·
高级氧化工艺
·
能源效率
✓ 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）