Catalysts
·
2025
·Vol. 15
·期 12
·1108
·
IF 4
Heng Yang,Chuang Zhu,Yongwei Zhang,Manting Gu
Single-atom catalysts are highly efficient electrocatalysts for water splitting with exceptional atomic utilization, but atomic aggregation can impair their catalytic performance. To address this challenge, a Fe-Co-Ni single-atom bifunctional catalyst supported on nitrogen-doped graphene oxide was designed and employed for overall water splitting in alkaline electrolyte. The catalyst’s composition, structure, and morphology were systematically characterized using XRD, XPS, SEM, and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). Electrochemical evaluations were performed to assess its activity and stability toward both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The results demonstrate that strong metal-nonmetal interactions between the Fe, Co and Ni single atoms and the nitrogen-doped graphene oxide support facilitate stable and uniform anchoring of the metal centers on the wrinkled carbon framework. The total metal loading reaches approximately 6.78 wt%, ensuring a high density of accessible active sites. Furthermore, synergistic electronic coupling among the Fe, Co, and Ni centers enhances charge transfer kinetics and modulates the D-band electronic states of the metal atoms. This effect weakens the adsorption strength of hydrogen and oxygen-containing intermediates, thus promoting faster reaction kinetics for both HER and OER. Consequently, the FeCoNi/CNG catalyst delivers low overpotentials of 77 mV for HER and 355 mV for OER at a current density of 10 mA cm−2in alkaline conditions. When integrated into an alkaline water electrolyzer, the system achieves a cell voltage of only 1.68 V to attain a current density of 10 mA cm−2, underscoring its outstanding bifunctional catalytic performance.
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产品关联
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Wenbin Li,Zhijian Zhou,Zhili Chen,Li Chen,Jin Tang,Lizhao Zhang
In this study, a new adsorbent denoted as nAg/nZVI/AC was developed using activated carbon (AC) loaded with nanosized zero-valent iron (nZVI) and nanosilver (nAg). Then, the adsorption and degradation of tetracycline hydrochloride (TCH) in aqueous solutions using nAg/nZVI/AC was examined. At pH 3.8, the adsorbed amount of TCH on nAg/nZVI/AC was 191.18 mg/g, which is 78.95 mg/g higher than that adsorbed on the pristine AC support. The adsorption process could be explained adequately using the Freundlich (R 2 = 0.9641) and pseudo-second-order kinetic models (R 2 = 0.9967). Thermodynamic analyses revealed that TCH removal is a spontaneous chemisorption-dominated process. Free-radical-quenching experiments and electron paramagnetic resonance spectroscopic studies revealed that hydroxyl (·OH) and superoxide (·O 2 − ) radicals are the main species involved in the degradation of TCH. Finally, the intermediates generated during the degradation were examined using liquid chromatography-mass spectrometry, and possible deterioration pathways are proposed.
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高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Liangmin Xiong,Shuang Liu,Yong Men,Lin Li,Xiaoda Niu,Kailiang Guo,Junzhe Xu,Wei An,Jinguo Wang,Yu Cong
CO 2 hydrogenation to liquid fuels is significant to reduce CO 2 emissions and replace fossil fuels . Herein, we reported that Fe catalysts promoted by combination of K and Pd showed a three-synergistic catalytic effect to high selectivity of C 5+ hydrocarbons in CO 2 hydrogenation reaction. The catalysts were prepared using an impregnation method and characterized with physical adsorption , XRD , XPS , HRTEM , H 2 -TPR, H 2 -TPD and CO 2 -TPD. The results indicated that K 0.016 Pd 0.12 Fe catalysts showed K-overlapped PdFe-like alloy structure which enhanced H 2 activation behaviors and moderately chemisorption of CO 2 . K addition promoted Fe to activate carbide species while active H originated from H 2 pool generated by PdFe alloy spilled to Fe species surface, consequently boosting not only conversion of CO 2 to 41.8% but also selectivity of C 5+ hydrocarbon to 70.6%. The maximum yield of long-chain C 5+ hydrocarbon reached up to 20.0% under high space velocity 6000 mL g cat −1 h −1 . These results provide a new insight to develop highly selective Fe based catalysts for long-chain hydrocarbons via CO 2 hydrogenation.
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高影响因子
Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
Jinpeng Wang,Ming Zhang,Runjuan Zhou,Jiyuan Li,Wei Zhao,Wenyuan Chen
This paper explored the effect of trace Cu(Ⅱ) (5 μM) on the degradation of Orange Ⅱ by Fe(Ⅱ)/Hydroxylamine (HA)/Persulfate (PS) system. The results showed that the addition of trace Cu(Ⅱ) not only improved the degradation efficiency of Fe(Ⅱ)/HA/PS system, but also broadened the pH range of Fe(Ⅱ)/HA/PS degradation Orange Ⅱ (2–10). Increasing the dosage of Fe(Ⅱ), Cu(Ⅱ) and PS will promote the degradation of Orange Ⅱ by the Cu(Ⅱ)/Fe(Ⅱ)/HA/PS system. However, the optimal dosage of HA is 0.03 mM. Lower or excessive HA dosage is not conducive to the degradation of Orange Ⅱ by the Cu(Ⅱ)/Fe(Ⅱ)/HA/PS system. Scavenger experiments show that SO 4 ·- is the main reactive oxygen species (ROS) in the Cu(Ⅱ)/Fe(Ⅱ)/HA/PS system. In both acidic and alkaline environments, Cu(Ⅰ) reduced by hydroxylamine can promote the conversion of Fe(Ⅲ) to Fe(Ⅱ). In acidic environment, Fe(Ⅱ) reduced by Cu(Ⅰ) is the reason why trace Cu(Ⅱ) can enhance the efficiency of Fe(Ⅱ)/HA/PS system to degrade Orange Ⅱ. However, in alkaline environment, Cu(I) reduced by hydroxylamine is the main participant in the production of SO 4 ·- by activating persulfate, which is also the main reason for broadening the applicable pH of Fe(Ⅱ)/HA/PS for Orange Ⅱ degradation to alkaline environment.
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高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Yanyu Xie,Huanfeng Huang,Zhuodi Chen,Zhujie He,Zhixiang Huang,Shunlian Ning,Yanan Fan,Mihail Barboiu,Jian-Ying Shi,Dawei Wang,Cheng-Yong Su
The rational design and synthesis of highly efficient electrocatalysts for oxygen evolution reaction (OER) is of critical importance to the large-scale production of hydrogen by water electrolysis. Here, we develop a bimetallic, synergistic, and highly efficient Co–Fe–P electrocatalyst for OER, by selecting a two-dimensional metal–organic framework (MOF) of Co-ZIF-L as the precursor. The Co–Fe–P electrocatalyst features pronounced synergistic effects induced by notable electron transfer from Co to Fe, and a large electrochemical active surface area achieved by organizing the synergistic Co–Fe–P into hierarchical nanosheet arrays with disordered grain boundaries. Such features facilitate the generation of abundant and efficiently exposed Co3+ sites for electrocatalytic OER and thus enable Co–Fe–P to deliver excellent activity (overpotential and Tafel slope as low as 240 mV and 36 mV dec–1, respectively, at a current density of 10 mA cm–2 in 1.0 M KOH solution). The Co–Fe–P electrocatalyst also shows great durability by steadily working for up to 24 h. Our work thus provides new insight into the development of highly efficient electrocatalysts based on nanoscale and/or electronic structure engineering.
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高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Nan Yang,Yanping Liu,Jia Zhu,Zhongqiang Wang,Jinwei Li
In order to improve the catalytic activity and recycling performance of heterogeneous Fenton catalyst, a heterogeneous Fenton catalyst Fe/TiO 2 based on TiO 2 supported visible light response was prepared by a simple method using TiO 2 synthesized by sol-gel method as carrier and ferric nitrate as Fe source. It was characterized by SEM , EDX , XRD, UV–vis instruments. The influencing factors of catalytic degradation of atrazine by visible light heterogeneous Fenton of Fe/TiO 2 were studied and the reaction kinetics were fitted. The mineralization degree of atrazine was reflected by the removal rate of TOC. The intermediate products by the degradation of the catalytic system was analyzed and the reaction mechanism of Fe/TiO 2 –H 2 O 2 visible light system was discussed. The XRD results showed that Fe was highly dispersed on the surface of TiO 2 in the form of α-Fe 2 O 3 . The Fe/TiO 2 catalyst with heterogeneous Fenton and visible light photocatalytic activity was successfully optimized, forbidden bandwidth of Fe/TiO 2 after Fe supported was narrower, the scope of light absorption red-shifted, the electron-hole pairs were more generated, and there was a significant synergistic effect between the carrier TiO 2 and the supported Fe, which exhibited good oxidation capacity for degradation of 10 mg L −1 atrazine in pH of 3, the concentration of H 2 O 2 was 1.6 mM, and the catalyst was added at 1 g L −1 , achieving over 95% removal efficiency within 30 min, and, in the range of pH 3–7, the degradation rate of the reaction for 30 min can be maintained above 75%, which greatly broadened the range of pH application and had good recycling performance. The degradation process conformed to the quasi-first-order kinetic model . Through LC-MS analyzed, 12 intermediate products were formed during the degradation of atrazine, the final products were all cyanuric acid, and then the triazine ring was mineralized into inorganic substances such as CO 2 , H 2 O and NO 3 − by oxidation of ·OH, and the possible degradation pathways were inferred.
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DOI
高影响因子
Advanced Membranes
·
2024
·
IF 0
Junqi Ning,Cailin Yang,Qiuyu Mei,Limingming Huang,Kai Han
ABSTRACT The practical use of solar-driven interfacial evaporation is hampered by high cost, low photothermal conversion efficiency, and poor stability. Herein, a one-dimensional Fe/C constructed photothermal membrane is rationally developed to replace precious metals via the combination of Fe plasmon resonance with carbon molecular thermal vibration. The membrane exhibits excellent light absorbance (95.72%) and water evaporation rate (2.60 kg·m -2 ·h -1 ) leading to photothermal conversion efficiency up to 95.65% under 1 sun illumination. Janus Fe/C membrane with superhydrophobic and hydrophilic structure is further prepared by polydimethylsiloxane (PDMS) coating to improve long-term stability. The evaporation rate can be maintained at over 90% after 80 h illumination for real seawater treatment with metal ion removal efficiency >99%. It also shows high evaporation performance and stability for organic solvents such as IPA, and NMP. Thus, the 1D Fe/C constructed Janus membrane is a promising candidate for energy-saving solar-driven interfacial solvent evaporation including seawater desalination, wastewater treatment, and organic solvent purification.
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DOI
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Yanhong Gu,Jianguo Zhao,Weiying Zhang,Haiwu Zheng,Laimei Liu,Wanping Chen
Sm and Ti co-doped BiFeO 3 (BFO) ceramics with Fe vacancies—Bi 0.86 Sm 0.14 FeO 3 , Bi 0.86 Sm 0.14 Fe 0.99 Ti 0.01 O 3 , and Bi 0.86 Sm 0.14 Fe 0.9 Ti 0.05 O 3 —were prepared by a solid-state method using a rapid liquid process. X-ray diffraction indicated that all samples exhibited a rhombohedral structure with a minor secondary phase. The structural transformation from a rhombohedral (space group: R 3 c ) to orthorhombic structure (space group: Pnma ) was observed in the sample of Bi 0.86 Sm 0.14 Fe 0.9 Ti 0.05 O 3 , which was also confirmed by Raman scattering spectra. Microstructural investigations with scanning electron microscopy showed a reduction in grain size with doping of BFO. The dielectric loss of Bi 0.86 Sm 0.14 Fe 0.9 Ti 0.05 O 3 reaches 0.05 (at 100 Hz) owing to the introduction of Ti and Fe vacancies. Ferroelectromagnetic measurements revealed the existence of ferroelectricity with a remanent polarization of 0.24 µC/cm 2 in Bi 0.86 Sm 0.14 FeO 3 , paraelectricity in Bi 0.86 Sm 0.14 Fe 0.9 Ti 0.05 O 3 , and weak ferromagnetism with a remanent magnetization of 0.2 emu/g in Bi 0.86 Sm 0.14 Fe 0.99 Ti 0.01 O 3 . The two composition-driven phases exist simultaneously and the different coercive field might be related to the jumps in the ferromagnetic hysteresis loops. Both the ferroelectric and magnetic properties were shown to correlate with the composition-driven structural evolution.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Zhouwei Miao,Xiaogang Gu,Shuguang Lu,Mark L. Brusseau,Xiang Zhang,Xiaori Fu,Muhammad Danish,Zhaofu Qiu,Qian Sui
The performance of Fe(III)-based catalyzed sodium percarbonate (SPC) for stimulating the oxidation of tetrachloroethene (PCE) for groundwater remediation applications was investigated. The chelating agents citric acid monohydrate (CIT), oxalic acid (OA), and glutamic acid (Glu) significantly enhanced the degradation of PCE. Conversely, ethylenediaminetetraacetic acid (EDTA) had a negative impact on PCE degradation, which may due to its strong Fe chelation and HO scavenging abilities. However, excessive SPC or chelating agent will retard PCE degradation. In addition, investigations using free radical probe compounds and radical scavengers revealed that PCE was primarily degraded by HO radical oxidation in both the chelated and non-chelated systems, while O 2 − also participated in the non-chelated system and the OA and Glu modified systems. According to the electron paramagnetic resonance (EPR) studies, the presence of HO in the Fe(III)/SPC system was maintained much longer than that in the Fe(II)/SPC system. The results indicated that the addition of CIT, OA or Glu indeed enhanced the generation of HO in the first 10 min and promoted degradation efficiency by increasing the amount of Fe(III) and maintaining the concentration of HO radicals in solution. In conclusion, chelated Fe(III)-based catalyzed SPC oxidation is a promising method for the remediation of PCE-contaminated groundwater.
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高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Shengyan Pu,Miaoting Wang,Kexin Wang,Yaqi Hou,Jing Yu,Qingqing Shi,Xiangjun Pei,Wei Chu
ABSTRACT As an effective and in situ purification strategy, adsorption technology has drawn much attention and recently the utilization of biomass substrate has been regarded as a promising way to enhance the adsorption performance and reduce cost. In this study, chitosan was applied as matrix and the magnetic Fe-crosslinked chitosan (CS-Fe@Fe 3 O 4 ) composite was obtained through a chelation procedure with cheap and environmentally friendly chitosan and iron salts. Then, the resultant CS-Fe@Fe 3 O 4 composites were characterized by scanning electron microscopy, transmission electron microscopy, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and thermogravimetric analysis. The sorption and desorption of methyl orange (MO), a common type of azo dye, on CS-Fe@Fe 3 O 4 composite was systematically studied to understand its availability for dyeing wastewater. The results revealed that CS-Fe@Fe 3 O 4 composites could efficiently remove MO in a wide pH range. The mixed Fe 3 O 4 particles were physically mixed andalmost had no negative effect on its adsorption. Moreover, the dye adsorption process was found to be controlled by the pseudo-second-order rate model and the adsorption isotherm behavior could be described by the Langmuir model. The repeatability test showed that the CS-Fe@Fe 3 O 4 composites could retain its high efficiency after desorption and regeneration. In summary, the results presented herein indicated that the resultant CS-Fe@Fe 3 O 4 nanocomposite with high adsorption efficiency and strong magnetic property could serve as a potential adsorbent for remediating industrial dyeing wastewater.
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DOI
高影响因子
JOM
·
2023
·Vol. 76
·期 2
·969-975
·
IF 2.6
Liu Hanning,Liu Peidong,Tian Qinghua,Dong Zhaowang,Chen Yubing,Guo Xueyi
Fe-36Ni invar alloys (Invar 36 alloys), which have a low thermal expansion coefficient (CTE) and good mechanical properties, are typically produced through a high-pollution smelting process. A green and quick-process method for the two-step hydrogen reduction of a designed mixture of Fe 2 O 3 and NiO powders was developed to prepare Fe-36 wt.%Ni alloys. A dense Fe-36 wt.%Ni alloy with an oxygen content of 0.20 wt.% was successfully produced. A single γ -FeNi phase was identified at 1000°C, whereas grains and twins became more evident at 1100°C. The final alloy exhibited excellent mechanical properties at room temperature, showing a hardness of 154 HV, a tensile strength of 486 MPa, a yield strength of 251 MPa, and a fracture strain of 21%.
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Jieyu Wang,Aijun Han,Mingquan Ye,Chenlu Chen,Xin Chen,Xufei Zhu
In this paper, a series of coated fabrics based on Fe-doped BaSnO3 (BaSn1–xFexO3−δ, x = 0.00, 0.05, 0.10, 0.20, 0.25) powder pigments were prepared. The results indicate that the developed pigments are substitutional solid solutions with no impurity and the valencies of iron confirmed by X-ray photoelectron spectroscopy (XPS) are +2 and +3. The BaSn1–xFexO3−δ pigments possess high near-infrared (NIR) solar reflectance (64.92–79.81%), and the change in the near-infrared reflectance value can be explained by the free carrier concentration and electron trap theory. The pigments exhibit the alteration of yellow-green to brown, which is ascribed to the charge-transfer transition (Sn 5s + 5p ↔ Fe 3d). The BaSn1–xFexO3−δ-coated fabrics exhibit excellent high NIR solar reflectance and thermal insulating performance. The NIR solar reflectance of the BaSn0.80Fe0.20O3−δ-coated fabric is up to 64.30%. Compared with those of brown uncoated fabric and conventional brown (Pigment Yellow 42) coated fabric, the inner surface temperature of the BaSn0.80Fe0.20O3−δ-coated fabric is lowered by 7.6 and 4.2 °C, while the heat absorption is reduced by 51.0 and 37.9%, respectively. The coated fabric shows excellent washing durability and chemical stability. In summary, these coated fabrics have the potential to serve as thermal insulation coated fabrics.
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高影响因子
危险品化学品经营许可证（带存储）