APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
X. Sun,M. Wang,Y.Q. Ma
For the first time, magnetic nano-structures (MNS) of 2D ε-Fe 3 N nano-sheets and 1D Fe 3 O 4 /Fe 3 N heterogeneous nano-chains were synthesized through electrochemical anodization without the assistance of any templates or surfactants. 2D BiOCl nano-sheets were intimately grown on surfaces of these MNS via the vapor-thermal method and isopropanol and ethylene glycol acting as solvents. As a result, 2D-2D and 1D-2D magnetic photocatalysts were achieved. MNS function as directing agents of BiOCl growth and control the oriented growth of BiOCl; furthermore, they compress the BiOCl crystal lattice due to the strain at the interface between MNS and BiOCl. BiOCl grown on 2D nano-sheets exhibits a flower-like morphology that consists of square nanosheets, while exhibiting the morphology of epispastic sponge for BiOCl grown on 1D heterogeneous nano-chains. To the best of our knowledge, this has not been reported before. The synergistic effects of MNS and BiOCl enhance the absorbance in the visible-light spectrum. All magnetic photocatalysts exhibited excellent adsorption and degradation abilities to target pollutants such as rhodamine B, methylene blue, and phenol. Here, using MNS as directing agents opens up a new route to realize the oriented assembly and growth of BiOCl nanosheets; this strategy can be adjusted for the synthesis of other catalysts.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Superconductivity and Novel Magnetism
·
2023
·Vol. 36
·期 3
·923-929
·
IF 1.8
Zhang Chaoyun,Peng Xiaoling,Li Jing,Ellis Tristan,Wu Qiong,Xu Jingcai,Hong Bo,Wang Xinqing,Ge Hongliang
Fe 4 N/Fe 3 N soft magnetic composites (SMCs) prepared by gas nitriding were studied. In this paper, Fe 4 N was obtained by nitriding pure iron in NH 3 /H 2 , then nitrided by pure ammonia gas to obtain Fe 4 N/Fe 3 N SMCs. The morphology, structure, and magnetic properties were studied by SEM, VSM, B-H Tester, and Impedance Analyzer. With the increase of nitridation time, Fe 3 N content gradually increased and reached saturation after nitriding for 5 h, saturation magnetization M S decreased, and M s was equal to 178.4 emu/g when nitriding time reached 8 h. With the increase in frequency, the effective permeability of Fe 4 N/Fe 3 N SMCs decreases, and the core loss increases. The synthesis of Fe 3 N generally reduced the effective permeability and loss of Fe 3 N/Fe 4 N SMCs, except for the 8 h nitrided sample. With the increase in frequency, complex permeability also decreased and tended to be stable. 8 h nitrided SMC has the largest Q and μ′.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2019
·
IF 0
Yan Zheng,Fei He,Jiaming Wu,Delong Ma,Huailin Fan,Shufei Zhu,Xiang Li,Yizhong Lu,Qing Liu,Xun Hu
Iron (Fe)- and nitrogen (N)-codoped carbon materials hold broad application prospects in the oxygen reduction reaction (ORR) because of their abundant reserves, low cost, and excellent catalytic activity. In this study, a N-doped carbon nanotube (CNT)–graphene framework with encapsulated Fe/Fe3N nanoparticles (Fe–N–CNT@RGO) is designed and synthesized by annealing a mixture of iron acetylacetonate, dicyandiamide, and graphene oxide via a one-step calcination strategy. Fe–N–CNT@RGO has a better ORR catalytic activity than reduced graphene oxide (RGO), N-doped graphene, and N-doped CNTs with encapsulated Fe/Fe3N nanoparticles with respect to the onset potential, limiting current density, and kinetic current density. Fe–N–CNT@RGO also has high stability and a high discharging cell voltage, which approaches those of platinum/carbon in zinc–air batteries. The relationship between the structure and activity of Fe–N–CNT@RGO demonstrates that the high density of Fe–N and pyridinic N sites, moderate wettability, and positive ζ potential promote exposure of the active sites, accelerate the transmission of hydrated oxygen, and enhance the adsorption of HO2– for the 4e– ORR.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2018
·
IF 3.046
Yong Li,Desheng Pan,Da Li,Yang Feng,C.J. Choi,Wei Liu,Zhidong Zhang
ε-Fe 3 N@C nanocrystals without oxidation are one-pot synthesized by using the iron(II) acetylacetonate and tetraethylenepentamine (TEPA) as Fe and N precursors under a low temperature (533 K) in the presence of a small quantity of Pt atoms as the co-catalyst. The ε-Fe 3 N@C nanoparticles with a core-shell structure are nearly spherical and have a wide particle size distribution of 100–500 nm in diameter. Fe nanoparticles obtained by reduction of Fe 2+ with TEPA are an effective catalyzer for decomposing TEPA to produce N and C atoms at a temperature much lower than the boiling point of TEPA. The diffusion of N atoms into Fe nanoparticles for the formation of ε-Fe 3 N@C is proposed, based on the results obtained by kinetically controlling the synthetic temperature and surfactants. The ε-Fe 3 N@C nanoparticles have an excellent saturation magnetization of 135.5 emu/g at room temperature. A significantly enhanced Curie temperature (T C ) of 614 K is reached in the present ε-Fe 3 N@C nanoparticles, which is much higher than the T C values in the previously reported ε-Fe 3 N x .
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Lei Liu,Xiuyun Zhao,Guofang Ding,Chunjiang Han,Jia Liu
Advanced oxidation processes (AOPs) have attracted much attention due to their adaptability to complex water environments. In this study, new catalysts (Fe/N-rGOs) with three dimensional (3D) interpenetrating structure were fabricated from the iron phthalocyanine (FePc) anchoring on reduced graphene oxide (rGO) for tetracycline (TC) degradation by activating peroxymonosulfate (PMS). Among them, the Fe/N-rGO-4 catalysts with high Fe-Nx center density exhibited the best degradation efficiency and the highest value of pseudo-first-order degradation reaction kinetic ( k = 0.185 min −1 ), which was approximately 18.5, 4.2, and 2.9 times higher than the rates achieved by the pristine PMS, rGO/PMS, and calcining FePc nanoclusters without rGO (Fe/N NPs/PMS) systems, respectively. Besides, Fe/N-rGO-4 exhibited satisfactory catalytic activity over a wide pH range (3.0–9.5) and remarkable stability of degradation performance after four consecutive cycles. Quenching experiments and electrochemical analysis demonstrated that 1 O 2 was the primary reactive species, which was facilitated by the mediated electron transfer originating from the C-N group with graphitic N at the defective edges of rGO. The π-conjugated region resulting from π-π stacking interaction between rGO and FePc is the pathway of electron transfer. Furthermore, Fe 3 N sites were proved as the primary catalytic active sites, which dominated the catalytic performance. Three degradation pathways of TC including twelve intermediates were proposed based on the Liquid Chromatograph Mass Spectrometer (LC-MS) analysis. Generally, this work highlighted the great potential of Fe/N-rGOs catalysts and provided a new insight into the synthesis of high-performance carbon-based catalysts for environmental remediation.
研究领域:
环境科学
·
催化材料
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Zihao Cui,Xizhuang Liang,Peng Wang,Peng Zhou,Qianqian Zhang,Zeyan Wang,Zhaoke Zheng,Yuanyuan Liu,Ying Dai,Baibiao Huang
Developing highly efficient and stable electrocatalyst for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is critical for overall water splitting to solve the shortage of fossil fuel and environment pollution, but it is full of obstacles and challenges. Fe 3 N@Co 4 N@CoFe alloy nanoparticles were prepared by using an in situ coupling method. The obtained catalyst showed a satisfactory OER performance in alkaline solution with a low overpotential of 225 mV at 10 mA cm −2 current density and a small Tafel slope of 48 mV/dec. Meanwhile, the HER performance was also improved in alkaline solution after cyclic voltammetry (CV) cycles of OER due to the formation of CoFe oxyhydroxides, which required an overpotential of 135 mV to achieve 10 mA cm −2 current density and a Tafel slope of 109 mV/dec. More importantly, the obtained Fe 3 N@Co 4 N@CoFe alloy electrode and Fe 3 N@Co 4 N@CoFe alloy-CV electrode (treated through CV cycles of OER) were used as anode and cathode to assemble a two-electrode system for overall water splitting. The constructed system displayed an impressive competency with a voltage of 1.59 V at 10 mA cm −2 current density. The prepared electrocatalysts demonstrated superb long-term stability under 50 mA cm −2 current density for OER, HER and overall water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2021
·
IF 8.271
Juan Xiao,Junwei Chen,Zuqiao Ou,Junhang Lai,Tongwen Yu,Yi Wang
Herein, the application of a N-doped graphitic-carbon-coated iron nitride composite dispersed in a N-doped carbon framework (Fe 3 N@NG/NC) is investigated as a heterogeneous electro-Fenton (HE-EF) catalyst for the efficient removal of organics. The simultaneous carbonization and ammonia etching of iron-based metal organic framework (Fe-MOF) materials yielded well-dispersed N-doped carbon-coated Fe 3 N nanoparticles with a diameter of ~70 nm. The Fe 3 N and pyridinic N endowed the composite with high HE-EF activity for decomposing the electrogenerated H 2 O 2 to • OH. The Fe 3 N@NG/NC exhibited outstanding HE-EF performance in removing various organic pollutants with low iron leaching. A removal rate of 97–100% could be obtained for rhodamine B (RhB), dimethyl phthalate , methylene blue , and orange II in 120 min at a pH of 5.0. When the solution pH was set to 3.0, 5.0, 7.0, and 9.0, the removal rate of RhB reached 100%, 96%, 92%, and 81%, respectively, in 60 min at an optimum voltage of 0.0 V ( vs. reversible hydrogen electrode (RHE)). Moreover, the concentration of leached iron was expected to be below 0.03 mg/L in a wide pH range of 3.0–9.0. In addition, the RhB removal efficiency remained as high as 90% after six cycles in the reusability experiments. This work highlights the MOF-derived Fe 3 N composite as an efficient HE-EF catalyst and the corresponding catalytic mechanism, which facilitates its application in wastewater treatment .
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Nan Xue,Jing Liu,Pengyuan Wang,Chunyan Wang,Sen Li,Hui Zhu,Jiao Yin
Reasonable design and scalable preparation of low-cost, effective and durable electro-catalysts as substitutes to expensive Pt-derived catalysts for oxygen reduction reaction (ORR) is highly desired toward the progress of future sustainable energy storage devices. In this work, we scalably prepare a highly active ORR electrocatalyst which consists of both Fe 3 N nanoparticles and Fe-N-C active sites in N-doped carbon frameworks (named as Fe 3 N/Fe-N-C) and derives from walnut shells as precursors followed by iron ion incorporation and a pyrolysis process in NH 3 atmosphere. The X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopic (XPS) measurements strongly evidence the coexistence of Fe 3 N nanoparticles and iron-nitrogen-carbon active sites. Benefiting from the synergistic mechanism between Fe 3 N nanoparticles and Fe-N-C sites in N-doped carbon frameworks, the resultant catalyst presents desirable ORR performance with impressive E onset , E 1/2 , higher long-term stability, and satisfactory resistance to methanol interference, overtopping commercial Pt/C catalyst. The present research not only proposes a cost-effective and available ORR electro-catalyst to substitute Pt-based catalysts, but also provides a reliable and versatile technology to realize large-scale preparation for practical applications.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemElectroChem
·
2019
·Vol. 6
·期 12
·3030-3038
·
IF 3.975
Ping Yan,Dewang Kong,Wenjing Yuan,Anjian Xie,Yuhua Shen
Graphical Relaxed conditions : A low-cost method is demonstrated for the synthesis of iron-based one-dimensional nitrogen-doped carbon nanotube nanocomposites (Fe/Fe 2.5 C/Fe 3 N/N-CNT). Unlike most Fe−N−C type CNT materials, Fe/Fe 2.5 C/Fe 3 N/N-CNT does not require a variety of templates or strict experimental conditions during the synthesis process to control the structure and morphology of the products, which makes the preparation process simpler with a lower energy consumption. This greatly increases its potential for practical applications. I n this study, a novel one-dimensional iron-based nitrogen-doped carbon nanotube (N-CNT) nanocomposite (Fe/Fe 2.5 C/Fe 3 N/N-CNT) was successfully synthesized in situ by using a facile and low-cost method. In alkaline media, the typical product (Fe/Fe 2.5 C/Fe 3 N/N-CNT-30) showed an good onset potential ( E onset =0.93 V vs RHE), half-wave potential ( E 1/2 =0.79 V vs RHE), and current density ( J =6.62 mA cm −2 at 0.2 V vs RHE), especially compared to the commercial 20 % Pt/C catalyst (0.95 V, 0.82 V, 5.61 mA cm −2 , respectively). In acidic medium, it also exhibits a good oxygen reduction reaction (ORR) activity. Moreover, Fe/Fe 2.5 C/Fe 3 N/N-CNT-30 exhibited superior long-term durability and methanol tolerance compared to Pt/C in both alkaline and acidic media. The excellent electrocatalytic performance of this material is attributed to the abundant carbon defects in the carbon structure, the high content doping of pyridinic N and graphitic N into the CNTs, the multi-model Fe species as active sites, and the fact that most Fe species within the CNTs avoid corrosion from electrolyte. This study paves a new way for highly active ORR electrocatalysts and promotes the rapid development of CNTs in some frontier fields.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Huan Wang,Shaobo Liu,Yunguo Liu,Yetao Tang,Mingyang Dai,Qiang Chen,Yuqi Deng
The persistence of pharmaceutical and personal care products (PPCPs) such as norfloxacin (NFX) poses a serious threat to the water environment, and the development of efficient and cost-effective advanced oxidation catalysts is an important step toward resolving this issue. Herein, Fe and N co-doped graphene (FeNGO) was synthesized from graphene oxide (GO), urea, and iron salt via simple impregnation pyrolysis , and applied for activating peroxymonosulfate (PMS) to degrade NFX. FeNGO possessed a two-dimensional porous sheet structure and was rich in defects, nitrogen species, and active sites. Compared with the control catalyst doped with N or Fe alone, FeNGO/PMS system showed the best degradation performance with 97.7% removal of NFX after 30 min, the rate constant was 7.1 and 1.7 times than that for NGO and FeGO, respectively. Fe 3 N was the main active site of FeNGO, and it is confirmed that singlet oxygen ( 1 O 2 ) and superoxide radical (O 2 •- ) were the primary oxidation active species (ROS) during NFX degradation. The formation of 1 O 2 came from the transformation of O 2 •- and PMS decomposition. FeNGO showed strong pH adaptability, and also exhibited stale degradation performance in saliferous water matrices. It is believed that this work will offer theoretical and practical guidance for PMS activation by non-radical pathways.
研究领域:
环境科学
·
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
CARBON
·
2022
·
IF 11.307
Dangcheng Su,Yuanhua Xiao,Yingliang Liu,Shengang Xu,Shaoming Fang,Shaokui Cao,Xuezhao Wang
2D MXenes (transition metal carbides, Ti 3 C 2 T x ) with large surface area and metallic conductivity are widely used as supporters in catalysts. Unfortunately, the single MXene sheets would deteriorate in the presence of oxygen and water, which is almost the same as the environment of oxygen reduction reaction (ORR). Herein, an “armor” was constructed to encapsulate the oxidizable MXene by a confined in-situ oxidative polymerization strategy, employing the electrostatic interaction between the exfoliated MXene sheets (negatively charged) and oxidant (Fe 3+ , positively charged). The ultra-dispersed binary Fe 3 N and Co sits coupled with the large surface area MXene supporter synergy to endow more exposed active sites, meanwhile, the density functional theory (DFT) studies reveal that a moderate binding strength between the intermediates and the binary active sites was effectively modulated to enhance the ORR performance. The synthesized Fe 3 N/Co–N–C@MXene exhibits an impressive half-wave potential (E 1/2 , 0.871V) and a lower Tafel slope of 52.56 mV dec −1 than that of Pt–C-20% (74.89 mV dec −1 ). The Fe 3 N/Co–N–C@MXene based ZAB exhibits a four times higher peak power density (189.16 mW cm −2 ) than the Pt–C-20% based ZABs and superior cycle stability within 320 h. Furthermore, the assembled flexible ZABs shows high flexibility and stability in different bending scenarios.
研究领域:
材料科学
·
电化学
·
纳米催化
·
能源存储与转换
·
功能材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zhen Sun,Taotao Xia,Hongyang Wang,Weiyi Yang,Shuang Gao,Qi Li
The Electro-Fenton process is getting a rapid development recently as a novel advanced electro-oxidation technology for the removal of organic pollutants from water. In this work, a three-dimensional (3D) porous Fe 3 N/FeS composite electrode was created from a Fe 2 (SO 4 ) 3 -based composite ink by the direct-writing 3D printing technology combined with a high temperature heat treatment under ammonia atmosphere. Fe 3 N served as the conductive skeleton of the electrode, while FeS could provide Fe 2+ to react with in-situ generated H 2 O 2 in the Electro-Fenton process to generate ·OH radicals. Thus, it could eliminate the need of external ferrous ion addition. The 3D porous Fe 3 N/FeS composite electrode had desired 3D interconnected macro-channels for efficient mass transport and rough rod surfaces to provide more active sites, which resulted in its superior degradation performance on organics than its traditional two-dimensional (2D) plate counterpart. A two-step H 2 O 2 production path was found on the 3D Fe 3 N/FeS composite electrode, which had been found to possess a faster reaction kinetics. It effectively degraded rhodamine B (RhB) within a wide pH range from ∼3 to ∼ 10, demonstrated stable performances in repeated uses, and had low iron ion leaching, all of which were beneficial for its potential applications. Furthermore, it also demonstrated effective degradation performances on antibiotics of amoxicillin (AMX) and tetracycline hydrochloride (TC-HCl) in both deionized (DI) water and tap water matrixes, indicating its potential to solve the emerging contaminant problem in real water treatment practices.
研究领域:
环境科学
·
材料科学
✓ 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）