APPLIED CATALYSIS A-GENERAL
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2022
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IF 5.723
Yuanfang Shen,Jingxuan Shou,Liangchen Chen,Weihang Han,Luping Zhang,Yutong Chen,Xuewei Tu,Shangfu Zhang,Qiang Sun,Yurong Chang,Hui Zheng
Photocatalytic nitrogen fixation from air directly under sunlight can contribute significantly to carbon neutralization. It is an ideal pathway to replace the industrial Haber Bosch process in future. A Fe-doped layered WO 3 photocatalyst containing oxygen vacancies was developed which can fix nitrogen from air directly under sunlight at atmospheric pressure. The iron doping enhances the transport efficiency of photogenerated electrons. The photocatalytic efficiency is around 4 times higher than that of pure WO 3 . The optium nitrogen fixation conditions were examined by orthogonal experiments and its nitrogen fixation performance could reach up to 477 μg·g cat −1 ·h −1 under sunlight. In addition, the process of nitrogen fixation was detected by situ infrared, which confirmed the reliability of nitrogen fixation. Also, modeling on the interactions between light and the photocatalyst was carried out to study the distribution of surface charge and validate the light absorption of the photocatalyst. This work provides a simple and cheap strategy for photocatalytic nitrogen fixation from air under mild conditions.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
ACS Omega
·
2023
·
IF 4.1
Jun Li,Yuhang Hua,Qiannan Yuan,Wenqi Gou,Hao Sun,Long Lin,Mengtao Wang,Mingxun Yu,Aiwen Qin
A corolla-shaped Schiff base polymer was synthesized from terephthalaldehyde (TPAD), glutaraldehyde (GA), and p-phenylenediamine (PPD) by block copolymerization, and Schiff base iron complexes were formed by doping with FeCl3. The microscopic morphology, crystal structure, and elemental valence state were characterized by field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Comparing the change of conductivity before and after Fe3+ doping, it was found that the conductivity did not break away from the category of insulator, and the doped sample is a paramagnetic material. Morphological changes were observed by adjusting the ratio of GA to TPAD, and it was found that the corolla-like structure was most complete when the ratio of GA to TPAD was 2:1, and its Schiff base iron complex absorbed waves better. At a thickness of 3 mm, the absorption effect can reach below −10 dB at 12.44–15.16 GHz, and the maximum absorption value is −45.07 dB at a thickness of 3.8 mm; it is an organic absorbing agent with excellent impedance matching and absorbing properties.
研究领域:
材料科学
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化学
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产品关联
DOI
PubMed
高影响因子
Small
·
2019
·Vol. 15
·期 47
·1904688
·
IF 10.856
Jian Zhang,Renjie Cui,Chencheng Gao,Linyi Bian,Yong Pu,Xinbao Zhu,Xing'ao Li,Wei Huang
Atom-scale modulation of electronic regulation in nonprecious-based electrocatalysts is promising for efficient catalytic activities. Here, hierarchically hollow VOOH nanostructures are rationally constructed by partial iron substitution and systematically investigated for electrocatalytic water splitting. Benefiting from the hierarchically stable scaffold configuration, highly electrochemically active surface area, the synergistic effect of the active metal atoms, and optimal adsorption energies, the 3% Fe (mole ratio) substituted electrocatalyst (VOOH-3Fe) exhibits a low overpotential of 90 and 195 mV at 10 mA cm −2 for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline media, respectively, superior than the other samples with a different substituted ratio. To the best of current knowledge, 195 mV overpotential at 10 mA cm −2 is the best value reported for V or Fe (oxy)hydroxide-based OER catalysts. Moreover, the electrolytic cell employing the VOOH-3Fe electrode as both the cathode and anode exhibits a cell voltage of 0.30 V at 10 mA cm −2 with a remarkable stability over 60 h. This work heralds a new pathway to design efficient bifunctional catalysts toward overall water splitting.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
ChemSusChem
·
2021
·Vol. 14
·期 7
·1710-1719
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IF 8.928
Liwei Shi,Hailiang Fang,Xiaoxia Yang,Jie Xue,Caifeng Li,Shifeng Hou,Cheng Hu
Graphical Doping for batteries : Fe-doped NiSe 2 nanosheets grown on activated carbon cloth substrates provide elevated performance as Li−S free-standing cathodes. Fe-doping in NiSe 2 enables improved charge transfer and stronger interactions with the adsorbed sulfur species, as well as higher electrical conductivity. The transformation of Li 2 S 2 /Li 2 S growth from conventional 2D films to 3D particles eliminates the barriers of phase transitions during the cathode redox processes. The commercialization of Li−S batteries is hindered by the shuttling of lithium polysulfides (LiPSs), the sluggish sulfur redox kinetics as well as the low sulfur utilization during charge/discharge processes. Herein, a free-standing cathode material was developed, based on Fe-doped NiSe 2 nanosheets grown on activated carbon cloth substrates (Fe-NiSe 2 /ACC) for high-performance Li−S batteries. Fe-doping in NiSe 2 plays a key role in the electronic structure modulation of NiSe 2 , enabling improved charge transfer with the adsorbed LiPSs molecules, stronger interactions with the active sulfur species and higher electrical conductivity. Effective promotion of the sulfur redox kinetics and enhanced sulfur utilization were achieved under high areal sulfur loadings. The stronger interactions with LiPSs together with the unique 3D structure of Fe-NiSe 2 /ACC also induced the transformation of Li 2 S 2 /Li 2 S growth from conventional 2D films to 3D particles, significantly eliminating the barriers of solid nucleation and growth during the phase transition of liquid LiPSs to solid Li 2 S 2 /Li 2 S. With a high sulfur loading of 9.9 mg cm −2 , the Fe-NiSe 2 /ACC cathode enabled a high area capacity of 9.14 mAh cm −2 with a low average decay of 0.11 % per cycle over 200 cycles at 0.1 C.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2021
·
IF 8.067
Fan Wang,Weihua Gu,Jiabin Chen,Qianqian Huang,Mingyang Han,Gehuan Wang,Guangbin Ji
Perovskite LaCoO 3 is of great potential in electromagnetic wave absorption considering its outstanding dielectric loss as well as the existing magnetic response with the magnetic doping. However, the dissipation mechanism of the magnetic doping on the microwave absorption is lack of sufficient investigated. In this paper, LaCo 1- x Fe x O 3 ( x =0, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, LCFOs) perovskites with different Fe doping amounts were prepared successfully by the sol-gel method and subsequent heat treatment in the air atmosphere. The structure characterization carried out by the first-principles calculations shows the effect of Fe doping on the dielectric and magnetic properties of LCFOs and the strong hybridization of Co/Fe-3d with O-2p in the LCFOs system was successfully demonstrated. Particularly, when x =0.1 and the thickness is only 1.95 mm, the LaCo 0.9 Fe 0.1 O 3 exhibits the best microwave absorption performance with the minimum reflection loss (RL) value of about -41 dB. The typical samples achieve a broad effective absorption bandwidth (EAB) of 5.16 GHz (7.92-13.08 GHz), which covers the total X band (8-12 GHz). Considering that, the especial Fe doping perovskite is promising to be a candidate as efficient microwave absorbers.
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
Materials Research Express
·
2021
·Vol. 8
·期 2
·025902
·
IF 1.62
Dong Zhang,Bingjun Zhu,Shiqi Ren,Qingru Wang,Qinglin Wang,Shuhong Li,Bingyuan Zhang,Wenjun Wang
ZnAl2O4 with spinel structure has attracted more attentions due to its robust dielectric and luminescence properties. Complex cation distribution in spinel structure influences the optical and magnetic properties. Herein, we report white emission related to the defects and the magnetism assigned to Fe impurity in ZnAl2-xFexO4 (0\leqslant x\leqslant 0.6) nanocrystals fabricated by using common sol-gel method at a relatively lower temperature (700 °C) than that reported earlier. ZnAl2-xFexO4 phosphors reveal single spinel phase without impure phase. Complex cation distribution is observed in all samples, for instance, Fe and Zn in antisites, cation vacancies, and with Fe content increasing, cation distribution reveals obvious change. The band gap energy of ZnAl2-xFexO4 phosphors is reduced from 3.84 eV to 3.33 eV when the content of Fe ions (x value) increases from 0 to 0.6. Two wide band emissions assigned to the various types of shallow and deep donor/acceptor defects are observed, monitoring with the excitation wavelength of 280 nm. The Commission International de I'Eclairage (CIE) colour coordinate (x, y) of the ZnAl2-xFexO4 phosphors is found to shift from (0.3218, 0.2957) to (0.3422, 0.3122) with Fe doping in spinel lattices owing to rearrangement of defects, indicating the potential application in white-light illumination. ZnAl2-xFexO4 reveals a room ferromagnetism resulting from Fe3 + ions in spinel lattices.
研究领域:
材料科学
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光学
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磁学
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DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2021
·
IF 3.498
Jiaying Pei,Zhongsheng Chen,Youqun Wang,Bo Xiao,Zhibin Zhang,Xiaohong Cao,Yunhai Liu
In this study, a 10%Fe-ZIF-8-300-PO 4 adsorbent was synthesized and its adsorption performance for U(VI) was investigated comprehensively. It was found that after a series of operations such as Fe doping, thermal activation and phosphorylation, the adsorption performance for U(VI) can be significantly improved on the basis of maintaining the skeleton characteristics of ZIF-8. The results showed that the optimal Fe-doping amount and thermal activation temperature was 10% and 300°C, respectively. The adsorption of U(VI) on 10%Fe-ZIF-8-300-PO 4 reached equilibrium within 60 min, and conformed to pseudo-second-order kinetic equation. Furthermore, a maximum saturated adsorption capacity of 691.83 mg/g was achieved. The above results demonstrated that 10%Fe-ZIF-8-300-PO 4 may be used to efficiently remove U(VI) from uranium-containing radioactive waste water.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Xiao Han,Hao Huang,Junze Wang,Min Zhang,Haixia Wu
To address the environmental residues of tetracycline (TC) antibiotics and the spread of antibiotic resistance genes, as well as to develop efficient synergistic photocatalytic Fenton catalysts, this study synthesized iron-doped molybdenum disulfide (Fe-MoS 2 ) composite catalysts via a hydrothermal method and constructed a synergistic photocatalytic Fenton system for efficient TC degradation. Experimental results showed that the doping of iron significantly optimized the electronic structure of MoS 2 , reducing its bandgap from 1.51 eV to 1.30 eV, thereby broadening its light absorption range. Additionally, Fe Mo dual active sites suppressed charge recombination and improved charge separation efficiency. Under visible light irradiation, Fe-MoS 2 synergistically activated H 2 O 2 , achieving a TC removal rate of 82.3 % within 60 min. Iron doping promoted the heterogeneous Fenton reaction, accelerated the Fe 3+ /Fe 2+ cycling, and facilitated the direct reduction of H 2 O 2 by photogenerated electrons to produce active species ( O 2 − and 1 O 2 ), while the synergistic hole oxidation effectively degraded TC. Fe-MoS 2 exhibited excellent stability in weakly acidic to neutral environments as well as in complex aqueous matrices, along with good recyclability. This study provides new insights for the development of efficient bifunctional catalytic materials and offers significant reference value for the treatment of antibiotic contamination in real wastewater.
研究领域:
环境科学
·
催化
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材料科学
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水处理
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抗生素污染控制
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Haohong Xian,Haoran Guo,Jiaojiao Xia,Qiru Chen,Yonglan Luo,Rui Song,Tingshuai Li,Enrico Traversa
Nitrogen can be electrochemically reduced to produce ammonia, which supplies an energy-saving and environmental-benign route at room temperature, but high-efficiency catalysts are sought to reduce the reaction barrier. Here, iron-doped α-MoO3 nanosheets are thus designed and proposed as potential catalysts for fixing N2 to NH3. The α-MoO3 band structure is intentionally modulated by the iron doping, which narrows the band gap of α-MoO3 and turns the semiconductor into a metal-like catalyst. Oxygen vacancies, generated by substituting Mo6+ for Fe3+ anions, are beneficial for nitrogen adsorption at the active sites. In 0.1 M Na2SO4, the Fe-doped MoO3 catalyst reached a high faradaic efficiency of 13.3% and an excellent NH3 yield rate of 28.52 μg h–1 mgcat–1 at −0.7 V versus reversible hydrogen electrode, superior to most of the other metal-based catalysts. Theoretical calculations confirmed that the N2 reduction reaction at the Fe–MoO3 surface followed the distal reaction path.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2015
·
IF 3.942
Pei Wu,Xuegang Luo,Sizhao Zhang,Ke Li,Fangwei Qi
A novel photo/thermocatalyst was synthesized using co-precipitation. The catalyst above was used to degrade the dye methylene blue (MB), via the processes of thermocatalytic degradation (TCD) and photo/thermocatalytic degradation (PTCD). The catalysts were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), UV–Vis diffusion reflectance spectroscopy (DRS), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), the Brunauer–Emmett–Teller (BET) technique, and the terephthalic acid photo-luminescence probing technique (TA-PL). Fe-doped Sr 2 Bi 2 O 5 powder was found to exhibit a high thermocatalytic activity and a high photo/thermocatalytic activity for the degradation of MB. The TCD and PTCD MB removal efficiencies reached 92.6 and 98.8%, respectively. Furthermore, HO and O 2 − were not found to be the predominant active radicals. Holes were found to be generated in both two TCD and PTCD; however, TA-PL and radical scavenger experiments indicated that more holes were formed in PTCD. This study discussed the probable thermocatalytic and photo/thermocatalytic mechanisms, finding them to be in good agreement with results.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
DOI
高影响因子
MODERN PHYSICS LETTERS B
·
2024
·
IF 1.8
Li Liu,Qifu Bao,Tiangui Zhao,Kun Liu,Detai Shi,Siyu Li,Wei Zhu,Xiaolong Li,Jianer Zhou
A series of Zn 1 − x Fe x O ( x = 0 , 0.015, 0.045, 0.075) nanoparticles were synthesized using the solution co-precipitation method, and their structural and property characteristics were investigated. X-ray diffraction (XRD) analysis revealed that all Zn 1 − x Fe x O samples exhibited a hexagonal wurtzite crystal structure with the P63mc space group. The introduction of Fe doping led to a slight lattice distortion in the samples. The morphology of the nanoparticles, including polydispersion and agglomeration, as well as the presence of the second phase ZnFe 2 O 4 , was examined by scanning electron microscope (SEM) and transmission electron microscope (TEM). UV–Vis diffuse reflectance spectroscopy demonstrated that the band gap of Zn 1 − x Fe x O lies between 3.152 and 3.163 eV. With the increase in Fe ion doping, the band gap shows a slight decreasing trend. Mössbauer spectroscopy revealed that iron ions in the nanoparticles existed in a trivalent state and exhibited two different configurations: One involved iron replacing zinc without creating a vacancy, while the other involved iron substituting zinc with a vacancy. The ferromagnetic nature of the Fe-doped samples can be attributed to the exchange interaction between two Fe 3 + ions mediated by the F-center mechanism.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Yunhua Zheng,Huiting Hu,Long Qian,Yao Zhu,Tao Zhang,Dongya Yang,Fengxian Qiu
The etching effect has the capability to control atom doping and trigger phase transformation, thereby enhancing the electrocatalytic reaction. Herein, iron-doped cobalt selenide (Fe-CoSe2) nanoparticle-decorated carbon nanofibers (Fe-CoSe2/CNFs) are synthesized by assembling an FeCo-Prussian blue analogue (FeCo-PBA) cube precursor with polyacrylonitrile fibers and then treating with hydrochloric acid, followed by gas phase selenization. The Fe-CoSe2/CNFs catalyst exhibits a large surface area and a porous structure, facilitating the permeation of electrolytes. Moreover, orthorhombic CoSe2 is obtained, which is in favor of improving the oxygen evolution reaction (OER). By modulating the etching time, the ideal crystal phase and the optimal amount of the dopant (Fe) can be achieved, thus showing favorable OER activity. Specifically, the Fe-CoSe2/CNFs electrocatalyst enables high electrocatalytic activity for the OER with a low overpotential of 263 mV to drive a current density of 10 mA cm–2 in 1 M KOH. A small Tafel slope of 51 mV dec–1 shows fast charge transfer kinetics. Density functional theory (DFT) calculations reveal that Fe-doped orthorhombic CoSe2(111) can modulate the electron structure, contributing to OH– adsorption ability. Given this, a strategy for phase transformation induced by etching technology is proposed to improve the intrinsic activity of the catalyst.
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
危险品化学品经营许可证（带存储）