MOLECULES
·
2024
·Vol. 29
·期 22
·5299
·
IF 4.2
Liangmei Xue,Songbo Li,Shengli An,Ning Li,Huipu Ma,Mengxin Li
Double perovskite oxides with mixed ionic and electronic conductors (MIECs) have been widely investigated as cathode materials for solid oxide fuel cells (SOFCs). Classical Fe-based double perovskites, due to their inherent low electronic and oxygen ionic conductivity, usually exhibit poor electrocatalytic activity. The existence of various valence states of B-site ions modifies the material’s catalytic activity, indicating the possibility of the partial substitution of Fe by higher-valence ions. LaBaFe2−xMoxO5+δ(x= 0, 0.03, 0.05, 0.07, 0.1, LBFMx) is used as intermediate-temperature solid oxide fuel cell (IT-SOFC) cathode materials. At a doping concentration above 0.1, the Mo substitution enhanced the cell volume, and the lattice expansion caused the formation of the impurity phase, BaMoO4. Compared with the parent material, Mo doping can regulate the oxygen vacancy concentration and accelerate the oxygen reduction reaction process to improve the electrochemical performance, as well as having a suitable coefficient of thermal expansion and excellent electrode stability. LaBaFe1.9Mo0.1O5+δis a promising cathode material for IT-SOFC, which shows an excellent electrochemical performance, with this being demonstrated by having the lowest polarization resistance value of 0.017 Ω·cm2at 800 °C, and the peak power density (PPD) of anode-supported single-cell LBFM0.1|CGO|NiO+CGO reaching 599 mW·cm−2.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Guangchao Li,Youbin Zheng,Hao Guo,Ze Li,Guohao Zhu,Liang Dong,Xin Liu,Jianbing Zang
In this paper, we present a method to enhance the stability of Fe–N–C electrocatalysts, known for their significant oxygen reduction reaction (ORR) activity and positioned as promising alternatives to commercial noble metal-based catalysts. Despite the favorable ORR activity, Fe–N–C suffers from inadequate stability in acidic media, primarily attributed the loss of active FeN 4 sites resulted from Fe-demetalation. However, recent investigation reveals that pyridine N exhibits remarkable stability in retaining Fe atoms. To address this, we achieved a high proportion of pyridine N doping in carbon nanofibers through a process involving nano-SiO 2 shell coating and electrospinning. The nano-SiO 2 shell coating method demonstrates efficacy and versatility in transforming pyrrole-type FeN 4 into pyridine-type FeN 4 , irrespective of the origin material being trivalent or divalent Fe, whether organic or inorganic.
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Chemistry-An Asian Journal
·
2024
·Vol. 19
·期 15
·e202400482
·
IF 3.5
Jiahua Wu,Xuan Yang,Dong Xu,Say Leong Ong,Jiangyong Hu
While numerous persulfate-based advanced oxidation processes (AOPs) have been studied based on fancy catalysts, the practical combination of Fe or Mn modified granular activated carbon (GAC) has seldom been investigated. The present study focused on a green and readily synthesized Fe−Mn bimetallic oxide doped GAC (Fe−Mn@GAC), to uncover its catalytic kinetics and mechanism when used in the peroxydisulfate (PDS)-based oxidation process for degrading Rhodamine B (RhB), a representative xenobiotic dye. The synthesized Fe−Mn@GAC was characterized by SEM-EDS, XRD, ICP-OES and XPS analyses to confirm its physicochemical properties. The catalytic kinetics of Fe−Mn@GAC+PDS system were evaluated under varying conditions, including PDS and catalyst dosages, solution pH, and the presence of anions. It was found Fe−Mn@GAC exhibited robust catalytic performance, being insensitive to a wide pH range from 3 to 11, and the presence of anions such as Cl − , SO 4 2− , NO 3 − and CO 3 2− . The catalytic mechanism was investigated by EPR and quenching experiments. The results indicated the catalytic system processed a non-radical oxidation pathway, dominated by direct electron transfer between RhB and Fe−Mn@GAC, with singlet oxygen ( 1 O 2 ) playing a secondary role. The catalytic system also managed to maintain a RhB removal above 81 % in successive 10 cycles, and recover to 89.5 % after simple DI water rinse, showing great reusability. The catalytic system was further challenged by real dye-containing wastewater, achieving a decolorization rate of 84.5 %. This work not only provides fresh insight into the kinetics and mechanism of the Fe−Mn@GAC+PDS catalytic system, but also demonstrates its potential in the practical application in real dye-containing wastewater treatment.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Naeem Akram,Wenlan Ma,Shehla Riaz,Jia Guo,Ali Ahmad,Jide Wang
In this study, Ni-Fe-based Prussian Blue Analogues (Ni-Fe PBA) served as precursors, giving rise to a NiO/Fe 3 O 4 -based bimetallic catalyst that underwent comprehensive examination for both chemocatalytic water oxidation and photocatalytic degradation of organic dyes. The morphologies and chemical compositions of the precursor and resultant bimetallic catalysts were thoroughly characterized using XRD, SEM, XPS, mapping, and FTIR techniques. The results indicated that the catalytically active center is the NiO/Fe 3 O 4 -based bimetallic nanocomposite. The in-situ-synthesized bimetallic catalyst demonstrated remarkable catalytic oxidation activity when evaluated with Sodium Persulfate (PS) as an oxidant. Oxygen evolution results revealed an impressive catalytic water oxidation activity, with an O 2 production rate of approximately 1594.3 µmol·g −1 ·h −1 . Moreover, the NiO/Fe 3 O 4 catalyst was utilized as a heterogeneous photocatalyst to activate photosensitizer (PS) for the two azo dye’s deterioration caused by the exposure to visible light. Both organic dyes were photocatalytically degraded with great efficiency when Fe 3 O 4 and NiO were combined because they increased the catalyst’s capacity to absorb light. Electron Spin Resonance (ESR) and radical trapping studies revealed that sulfate (SO4· - ) and hydroxyl (OH·) radicals played pivotal roles. The degradation mechanism and pathway for Rhodamine B (RhB) were also elucidated. The exceptional recyclability and stability of the NiO/Fe 3 O 4 catalyst make it particularly promising for potential applications in water treatment, addressing challenges related to energy sustainability and environmental toxicity.
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ADVANCED POWDER TECHNOLOGY
·
2025
·
IF 4.2
Yan Zhao,Xing Zhou,Hongfeng Ji,Bian Li,Wei Zhou,Yao-Hua Liu,Guixi Liu
This study focuses on the thermal decomposition regulation behavior of AP achieved by Fe5B/AP nanoparticles, which are characterized using XRD, XPS and other techniques. When the mass ratio of Fe5B catalyst to AP was 3: 1, the high-temperature peak associated with AP decomposition advanced significantly by 181 ℃, resulting in a more concentrated exothermic process. Additionally, solid propellant containing an optimal mass ratio of 1: 3 for Fe5B to AP exhibited higher burning velocity compared to Fe 2 O 3 under low pressure condition with a 10 % increase in burning rate. Within the pressure range from 3.0 MPa to 9.0 MPa, the combustion rate of solid propellant containing Fe5B/AP (1: 3) remained similar to that achieved with Fe 2 O 3 but displayed a lower pressure index. The mechanistic studies show Fe-based structural units and active metal centers served as intermediates for electron transfer,expediting electron transfer between ClO 4 - and NH 4 + in the LTD process. Fe5B/AP particles generate iron oxides in situ, facilitating the adsorption of oxygen species and promoting increased heat release during the HTD stage. These findings highlight the potential application of Fe5B/AP as combustion catalysts for solid propellants by enabling controlled decomposition behavior of ammonium perchlorate.
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APPLIED CATALYSIS A-GENERAL
·
2024
·
IF 4.7
Meng Xia,Shuai Zhang,Kaihao Xu,Chengxue Zhang,Xiaocong Wang
In arid and semi-arid areas, the remediation of saline-alkaline soils polluted by organic contaminants is challenging. In this study, the adsorption–photocatalysis synergistic removal of organic contaminants was realised using the MIL-88A(Fe) catalyst, and the saline-alkaline soils were remediated simultaneously. The adsorption isotherm of catalyst conformed to Langmuir model, and the photocatalytic degradation of PHE in an optimal visible light system achieved a PHE degradation efficiency of up to 86.2 % within 30 min. Based on the identification of active oxygen species, the PHE photocatalytic degradation was primarily driven by holes (h + ) and superoxide radicals (·O 2 - ), followed by hydroxyl radicals (·OH) and singlet oxygen ( 1 O 2 ). Furthermore, the determined physical and chemical properties of the saline-alkaline soils indicated that the soil pH value decreased to 6.82, effectively increasing the absorbable nitrogen content and improving soil fertility. This study offers a new strategy for the removal of organic contaminants under special soil medium conditions.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Min Li,Chenlong Zhang,Jie Dou,Chi Jiang,Yingli Wang,Qiyao Guo,Xinyu Zhang,Bin Dong,Qunwei Tang
Constructing ultra-high activity, highly efficient and robust oxygen evolution reaction (OER) electrocatalysts, especially at large current density, plays a key role in the development of the electrolytic water industry but remains challenging. Highly dispersed alloy compound with large electrolyte contact area and excellent internal conductivity is considered as a kind of ideal candidate. Here, we have rationally designed and synthesized a nickel-platinum alloy with octahedral structure loaded on the surface of the carbon layer (NiPt/C). Under the in-situ modulation of the iron-containing electrolyte, the Fe modified NiPt/C catalyst displays an amazing OER activity in 1 M KOH, and only requires low overpotentials of 183 and 242 mV to reach 100 and 1000 mA cm −2 , respectively. The comprehensive characterization analysis and property measurements reveal that the pre-oxidation of Pt at OER potential contribute to the rapid production of nickel hydroxide, thus promoting the deposition of more iron active sites on its surface. Moreover, the Pt/C/CP (−) //NiPt/C/CP (+) couple embedded in anion-exchange membrane water electrolyser also displays a low cell voltage of 2.03 V at 1000 mA cm −2 with significant electrochemical stability, which endows it a great potential in the field of hydrogen production and electrochemical energy storage.
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International Journal of Environmental Science and Technology
·
2024
·
IF 3
Feng Qian,Liu Jia,Liu Zhigang,Zhou Yuhong,Zhou Yuze,Dong Zhihui,Tang Dongyan
Wastewater containing organic pollutants has created serious environmental issues and severely threatened human health due to the industry’s rapid development. Fenton processes, among the most economical advanced oxidation methods, can efficiently decompose and completely mineralize organic pollutants. Fenton processes have been widely employed in wastewater treatment to remove organic dyes; however, their practical application is limited due to the secondary pollution of Fe sludge. This work used the electrospinning technique to create Fe-alginate/PVDF nanofibers with a mass ration of 1:0.3, followed by iron ion exchange (0.08 wt%) as a photo-Fenton catalyst. The catalytic degradation of 20 mg/L methylene blue revealed that Fe-alginate/PVDF nanofibers (10 mg) had remarkable photo-Fenton catalytic performance, degrading 97.24% of methylene blue within 40 min under optimized conditions (pH of 3, H 2 O 2 concentration of 0.20 mM). Additionally, the wetting property and the development of the Fe-alginate coordination structure prevented iron leaching and strengthened the Fe-alginate/PVDF nanofibers’ structure stability, thus limiting secondary pollution of wastewater during application. Moreover, Fe-alginate/PVDF nanofibers could effectively remove MB over a wide pH range of 3.0–9.0, applied to the majority industrial wastewater (neutral or slightly acidic pH conditions). This work provides a facile strategy to prepare stable and cost-effective heterogeneous photo-Fenton catalysts, demonstrating potential applications in industrial-scale wastewater treatment.
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CORROSION SCIENCE
·
2024
·
IF 7.4
Fei Gao,En Su,Jiaming Hou,Jiale Wang,Yukun Zhou,Haotian Qin,Zhenhai Xie,Jinlong Mao,Huaiyu Li,Wenjie Tao,Yingqi Chen,Junyu Qian,Guojiang Wan
Long-term corrosion profile of molybdenum was studied in three different simulated body fluids up to 28 days, compared with magnesium, zinc, and iron from the perspective of biodegradable metals (bio-metals). Their corrosion rate, mode, products and surface characteristics were comprehensively fathomed. Strikingly, Mo showed progressively advantageous long-term corrosion behavior with the smallest corrosion rate, and most importantly, more uniform mode, as compared with the other three bio-metals. It also performed bilaterally under the simulated inflammatory and bovine serum protein added conditions, with different corrosion progressions. These findings provide an optimistic outlook in opting molybdenum as a new type of bio-metal.
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Science China-Chemistry
·
2025
·
IF 9.7
Liu Jie,Ye Qiu,Wu Yi,Chen Junliang,Ge Yongjie,Zhang Linjie,Abazari Reza,Qian Jinjie
Molecular catalysts like metal phthalocyanines (MPc) hold significant promise for diverse applications in renewable energy conversion and storage. Despite their inherent catalytic activity in the oxygen reduction reaction (ORR), enhancing their practical applicability necessitates addressing challenges in electrical conductivity and catalytic stability through effective control of electron distribution within the substrate. In this work, we have successfully synthesized an electrocatalyst featuring FePc molecules anchored onto N,S co-doped carbon nanorods from a pillar-layer metal-organic framework (MOF), designated as ZTB-NSCR-FePc. This MOF-derived heteroatom-doped carbon substrate could be easily obtained by direct pyrolysis of a pre-fabricated rod-like Zn-TDC-bpy. The optimized ZTB-NSCR-FePc demonstrated exceptional electrocatalytic efficiency and stability towards ORR with a positive half-wave potential of 0.890 V. When employed in a Zn-air battery, it outperformed the benchmark Pt/C air cathode, achieving a peak power density of 198.9 mW cm −2 . Finally, theoretical calculations revealed that short-range electron interactions between N/S atoms and the graphene substrate significantly enhance the anchoring effect of FePc, improve the adsorption of reaction intermediates, and thereby boost the ORR performance.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·
IF 0
Sun Qing,Yu Jiale,Zhao Youpu,Liu Hanhu,Li Chunsheng,Tao Jiajun,Zhang Jian,Sheng Jiawei
Iron-based catalysts are environmentally friendly, and iron minerals are abundant in the earth's crust, with great potential advantages for PMS-based advanced oxidation process applications. However, homogeneous Fe 2+ /PMS systems suffer from side reactions and are challenging to reuse. Therefore, developing catalysts with improved stability and activity is a long-term goal for practical Fe-based catalyst applications. In this study, we prepared Fe-HNTs nanoreactors by encapsulating a nitrogen-doped carbon layer with one-dimensional halloysite nanotubes (HNTs) using the molten salt-assisted method. Subsequently, Fe (Co, Ni) nanoclusters were anchored onto the nitrogen-doped carbon layer at a relatively low temperature (550℃), resulting in stable and uniform distribution of metal nanoclusters on the surface of HNTs carriers in the form of Fe-N x coordination. The results showed that the dissolution of the molten salt and leaching of post-treated metal oxides generated numerous mesopores within the Fe-HNTs nanoreactor, leading to a specific surface area more than 10 times that of HNTs. This enhanced mass transfer capability facilitates rapid pollutant removal while exposing more active sites. Remarkably, Fe-HNTs adsorbed up to 97% of tetracycline within 60 min. In the Fe-HNTs/PMS system, the predominant reactive oxygen species has been shown to be 1 O 2 , and the added tetracycline was degraded by more than 98% within 5 min. The removal of tetracycline was maintained above 96% in the presence of interfering factors such as wide pH (3–11) and inorganic anions (5 mM Cl − , HCO 3 − , NO 3 − , and SO 4 2− ). The investigated mechanism suggests that efficient degradation and interference resistance of the Fe-HNTs/PMS system is attributed to the synergistic effect between the rapid adsorption of porous structure and the non-radical ( 1 O 2 )-dominated degradation pathway. Graphical Abstract
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DIAMOND AND RELATED MATERIALS
·
2025
·
IF 5.1
Liu Ouyang,Huihu Wang,Lizhong Duan,Jingle Zhang,Shenghao Jiang,Yu Xiong,Chenhuinan Wei,Xing Xiang,Yun Zhao,Qianyu Wang
Tetracycline (TC), a widely detected aquatic pollutant, poses significant ecological risks, necessitating the development of effective remediation strategies. Photocatalytic degradation, which converts TC into harmless CO 2 and H 2 O, offers a promising eco-friendly solution. This study successfully synthesized a novel 2D/3D g-C 3 N 5 /BiVO 4 (N-CN/BiVO 4 ) S-scheme heterojunction via a hydrothermal method. The optimized 5 % N-CN/BiVO 4 exhibited exceptional performance in activating the Fe 2+ /PMS system under visible light, achieving a 96.8 % TC removal efficiency with an apparent rate constant 4.4 times higher than that of BiVO 4 . Mechanistic studies, including ultraviolet photoelectron spectroscopy (UPS) and valence band X-ray photoelectron spectroscopy (VB-XPS), confirmed the S-scheme interfacial charge transfer pathway. Furthermore, radical quenching experiments revealed that the enhanced photocatalytic activity originated from the synergistic contribution of multiple reactive species ( OH, SO 4 − , O 2 − , h + , and 1 O 2 ), validating both the efficient activation of Fe 2+ /PMS and the proposed S-scheme charge transfer mechanism. This work presents an innovative approach for high-performance pollutant degradation by coupling an S-scheme heterojunction with the Fe 2+ /PMS activation system.
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