JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xinqiang Liu,Haoran Yin,Shifan Zhang,Menghan Huang,Tayirjan Taylor Isimjan,Xiulin Yang,Dandan Cai
Strategically tuning the composition and structure of transition metal phosphates (TMPs) holds immense promise in the development of efficient oxygen evolution reaction (OER) electrocatalysts. However, the effect of crystalline phase transformation for TMPs on the catalytic OER activity remains relatively uncharted. In this study, we have deftly orchestrated the reaction process of anion-etched precursor to induce the amorphization process of FeCo-PO x from crystalline to amorphous states. The as-obtained amorphous FeCo-PO x (A-FeCo-PO x ) exhibited an optimized OER performance with a low overpotential of 270 mV at a current density of 10 mA cm −2 , which could be attributed to the flexibility of its amorphous structure and the synergistic effect of oxygen vacancies . Moreover, when incorporated into an overall water splitting (OWS) device configured as A-FeCo-POx (+) ||Pt/C (–) , it displayed long-term solid stability, sustaining operation for 300 h at a current density of 200 mA cm −2 . This work not only provides valuable insights into understanding the transformation from crystalline to amorphous states, but also establishes the groundwork for the practical utilization of amorphous nanomaterials in the field of water splitting.
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Journal of Food Measurement and Characterization
·
2021
·Vol. 15
·期 2
·1747-1753
·
IF 2.431
Li Yi-Fang,Lin Zheng-Zhong,Hong Cheng-Yi,Huang Zhi-Yong
A facile colorimetric method for rapid detection of putrescine (Put) and cadaverine (Cad) based on the peroxidase-like activity of (Fe,Co) codoped-CDs was developed. With the enzymatic hydrolysis by diamine oxidase (EC 1.4.3.6, DAO), Biogenic amines (BAs) were decomposed to produce H 2 O 2 which oxidizes 3,3',5,5'-tetramethyl-benzidine with the catalysis of (Fe,Co)-codoped CDs. By means of principal component analysis, Put and Cad were differentiated from BAs and their total amounts were detected by measuring the spectral absorption at 652 nm with a linear range from 0.25 to 10 mg kg −1 . The colorimetric method was applied to the detection of Put and Cad in various fish samples with a detection limit ((3σ/k, n = 9)) of 0.06 mg kg −1 . Besides verifying with HPLC, the recoveries of the colorimetric method were also tested by spiking standards at three levels with the range of 98.2%–115.7%, indicating that the established colorimetric method was accurate and sensitive.
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Molecular Catalysis
·
2020
·
IF 3.687
Wei Wu,Wei Zhang,Yu Long,Jiaheng Qin,Jiantai Ma
In this work, by the simple pyrolysis of Fe 2+ , Co 2+ or Ni 2+ and 1,10-phenanthroline (Phen) complexes under the presence of activated carbon and dicyandiamide in nitrogen atmosphere, different nonprecious transition metal-based species that well confined in nitrogen doped carbon (M-N-C, M = Fe, Co or Ni) were prepared. The Fe-N-C showed the best catalytic performance for the transfer hydrogenation of halogenated nitrobenzenes. More importantly, through the catalytic results comparison of the three catalysts estimated by gas chromatography-mass spectrometer, two speculations might be presented for the reaction pathway depending on the catalyst used. The transfer hydrogenation reaction route over Fe-N-C might follow the indirect way like the Co-N-C and Ni-N-C. Another assumption was the Fe-N-C might go through the direct pathway in contrast to the Co-N-C and Ni-N-C which resulted in formation of azoxybenzene and azobenzene intermediates before complete conversion to aniline. Those differences were found to be correlated with the different valence states and active metal components in different catalysts. In addition, the optimal Fe-N-C could be efficiently recovered by using an applied magnetic field and reused without significant decrease of activity. Therefor the catalyst may possess important potential for the industrial application in the selective hydrogenation of halogenated nitrobenzenes.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Peng Liu,Dengjie Zhong,Yunlan Xu,Nianbing Zhong,Guangjun He
Co/Fe co-doped porous graphite carbon (Co/Fe-PGC) nanocomposites were successfully prepared by one-step pyrolysis with CoFe-MOF, in which the Co/Fe nanoparticles were uniformly coated on porous graphite carbon derived from MOF. It was used to microelectrolysis-Fenton degrade rhodamine B through the main active substance ∙OH. The color and TOC removal rate of 100 mg/L rhodamine B reached 99.41% and 64.6%, respectively, for 30 min. Rhodamine B was degraded into small molecular organic acids, alcohols and lipids by N-demethylation and chromophore cleavage, until it was finally degraded into CO 2 and H 2 O, and no new colored organics were produced in the degradation process. The degradation process follows the first-order reaction kinetics, and its rate constant is much higher than that of the previous similar studies. The excellent catalytic performance of Co/Fe-PGC catalyst is attributed to the coupling effect of micro-electrolysis and Fenton reaction, and the acceleration of cobalt on electron transport and Fe 2+ reduction. Co 0 /Fe 0 undergoes galvanic corrosion to generate Co 2+ /Fe 2+ and H 2 O 2 , and then these products undergo Fenton reaction to generate Co 3+ /Fe 3+ and ∙OH, thus forming a circulating system of Co 3+ /Fe 3+ and Co 2+ /Fe 2+ , enhancing the activation of H 2 O 2 and ensuring the efficient degradation of RhB.
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ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Qijian Niu,Junxia Guo,Yunhui Tang,Xindong Guo,Jun Nie,Guiping Ma
In this work, a bimetal-organic framework/graphene oxide with sandwich-type structure as a precursor is prepared by the solvent-thermal approach. A nanoporous reduced graphene oxide (rGO) nanosheets enriched with Fe, Co and N (Fe/Co-N) co-doped active sites is prepared followed by a high temperature carbonization and acid leaching (AL) process. When the molar ratio of Fe/Co is 0.40 before carbonization , the prepared sample exhibits optimized electrocatalytic activity (a high onset potential (0.98 V vs. RHE), half-wave potential (0.84 V vs. RHE), and a large limiting current density (-5.46 mA cm −2 at 0.21 V vs. RHE) as oxygen reduction reaction (ORR) electrocatalysts . Most importantly, the duration stability and methanol tolerance of the as-prepared sample are better than common commercial 20 wt% Pt/C under 0.10 M KOH alkaline condition. These results demonstrate the co-doping of bimetal Fe/Co and heteroatom N, excellent electrical conductivity of rGO and large surface area of nanoporous structure enhance the electrocatalytic activity . The successful synthesis of such nanoporous rGO nanosheets provides a facile way to explore a series of 2D non-precious metal electrocatalysts for energy conversion and storage devices.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Ce Han,Xiangjie Bo,Jian Liu,Mian Li,Ming Zhou,Liping Guo
In this work, a novel catalyst in form of Fe, Co bimetallic alloy activated N-doped graphitic carbon layers (NC/Fe 10-x Co x ) without metal core is rationally fabricated through a simple pyrolysis method and applied for efficient oxygen reduction reaction (ORR) catalysis. The NC/Fe 10-x Co x catalysts have exhibited superior electrocatalytic ORR performance comparable to commercial Pt/C via a four-electron pathway under the same loading in alkaline media with outstanding durability and complete methanol tolerance. The improvement of ORR performance can be attributed to the synergistic effect of Fe, Co bimetallic activation on nitrogen-doped graphitic carbon layers, rich pore structure and uniformly dispersed dopants in the carbon matrix.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2025
·Vol. 27
·期 2
·1-15
·
IF 2.6
Hui Xianghe,Fang Dong,Wang Guifang,Ran Feng,Zhang Xin,Fu Zewei,Ruzimuradov Olim
Perovskite hydroxystannate (MSn(OH) 6 ) has garnered considerable interest in recent years as a novel flame retardant characterized by its low toxicity and environmentally benign properties. In order to improve the flame retardancy and smoke suppression properties of epoxy resin (EP) matrices, transition metal hydroxystannate (MSn(OH) 6 , M = Fe, Co, Mn) was prepared by a ultrasonic-coprecipitation method and used as flame retardants. The synthesized composites were assessed for their flame retardant characteristics and mechanical properties through the measurement of the limiting oxygen index (LOI), the cone calorimetry test (CCT), and universal tensile testing. Upon the incorporation of 10 wt% of the MSn(OH) 6 flame retardants, the flame retardant of EP composites exhibited marked enhancement, especially manganese hydroxystannate (MHS). Compared with pure EP, the EP/MHS-10 composite demonstrated the best performance, reducing the peak of heat release rate (pHRR), total heat release (THR), total smoke production (TSP) by 60.0%, 14.4%, and 32.6%, respectively. During the process of combustion, the decomposition of MSn(OH) 6 results in the generation of non-flammable gases and water vapor. In the condensed phase, tin (Sn) and transition metals contribute to the formation of a more protective char residue. The residue serves as a physical barrier, effectively isolating the underlying epoxy (EP) matrix material from heat and oxygen.
研究领域:
材料科学
·
化学工程
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Advanced Powder Materials
·
2023
·
IF 0
Cheng Li,Yatian Deng,Liping Yang,Bo Liu,Dong Yan,Liyuan Fan,Jian Li,Lichao Jia
Sr 2 FeCo 0.2 Ni 0.2 Mo 0.6 O 6-δ (SFCNM) and Sr 2 FeNi 0.4 Mo 0.6 O 6-δ (SFNM) were prepared as the hydrogen electrode materials for solid oxide cells (SOCs) and comparatively investigated by density function theory (DFT) and experiments to demonstrate the benefit of Co addition. The reduced SFCNM (R-SFCNM) and SFNM (R-SFNM) contain exsolved Fe–Co–Ni and Fe–Ni nanoparticles, respectively. DFT indicates that Fe–Co–Ni has optimized combination of the d-band center (descriptor of catalyst activity) and adsorption behavior for H 2 O, H 2 , H, and OH. The cell with SFCNM hydrogen electrode, La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3-δ (LSGM) electrolyte, and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) oxygen electrode (Cell-SFCNM) demonstrates a higher performance than that with an SFNM hydrogen electrode (Cell-SFNM) at temperatures between 700 and 850 °C in both solid oxide fuel cell (SOFC, 3% H 2 O-97% H 2 /air) and solid oxide electrolysis cell (SOEC, 20% H 2 O-80% H 2 /air) modes. At 850 and 700 °C, the peak power density is 1.23 and 0.48 W·cm −2 in SOFC mode, while the current density is 1.25 and 0.37 A·cm −2 at 1.3 V in SOEC mode, respectively. The performance degradation rates at 750 °C are 0.17 mV·h −1 in SOFC and 0.15 mV·h −1 in SOEC modes within 150 h, which are improved by Co doping.
研究领域:
材料科学
·
能源科学
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2024
·
IF 5.4
Wenjing Yang,Chenhang Ding,Yibing Ji,Chongxian He,Feilong Xiong,Wurikaixi Aiyiti,Cijun Shuai
The overexpression of glutathione (GSH) within the tumor microenvironment has long been considered as the major obstacle for reactive oxygen species (ROS)-based antitumor therapies. To address this challenge, a selenite (SeO 3 2 − ) and ferric ion co-doped hydroxyapatite (SF-HAP) nanohybrid was synthesized, which is then introduced into poly-L-lactic acid (PLLA) to prepare porous scaffold by selective laser sintering to continuously release Fe 3+ and SeO 3 2− ions. Of great significance is the released SeO 3 2− catabolize GSH to generate superoxide anion (O 2 •− ) rather than directly eliminating GSH, thereby reversing the obstacle posed by its overexpression and achieving a "waste-to-treasure" transformation. The newly generated O 2 •− synergizes with the hydroxyl radicals (•OH) produced by the Fenton reaction between Fe 3+/2+ and hydrogen peroxide, triggering high concentration ROS storms. Collectively, the PLLA/SF-HAP scaffold mediated self-augmented catabolism dynamic progress significantly raised intracellular ROS levels, almost twice as much as PLLA/Fe-HAP scaffold, thereby effectively inducing tumor cell apoptosis. The study provides an innovative inspiration for ROS-based antitumor therapies.
研究领域:
生物材料学
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肿瘤学
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医学工程
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ACS Applied Nano Materials
·
2026
·
IF 5.8
Yue Qian,Xiaopeng Luo,Ying Mao,Haiyang Gu,Lan Zhang,Xiaomin Zhang,Xuejing Shen,Rui Zhu,Zhanjun Wu
Transition metal-modified carbon composites have emerged as promising candidates for electromagnetic wave (EMW) absorption due to their tunable microstructure and tailorable electromagnetic properties. However, the influence of metal species configuration on dielectric loss at the atomic scale remains less understood. In this work, we fabricated three types of M-NC absorbers (M = Fe, Co, and Ni; NC = N-doped carbon) using a unified method that includes templating, pyrolysis, and acid etching. This approach produced samples with similar porous structures, which helped minimize structural differences and isolate the effect of the metal species. Among them, Ni-NC achieved a minimum reflection loss of −39.7 dB at 13.3 GHz with a matching thickness of only 2.0 mm, much better than Fe-NC (−22.5 dB) and Co-NC (−27.3 dB). This superior performance is attributed to the specific metal-N bonding structure, which governs both the interfacial polarization and the electronic structure. Meanwhile, the 3D carbon porous framework promotes impedance matching and extends the EMW propagation path through multiple scattering, collectively enabling superior absorption performance. Radar cross section simulation results confirm the effective EMW attenuation of these composites, particularly Ni-NC, highlighting their potential suitability for stealth applications. This work provides fundamental insights for the rational design of high-performance, lightweight EMW absorbers through precise chemical structure engineering.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 6
·124918
·
IF 7.5
Zhouxiao Zhai,Jingce Bi,Linshan Wang,Ningning Liu,Yi Wang,Xia Zhang,Zhuopeng Wang,Yide Han
It remains challenging to fabricate bimetallic MOF-derived catalysts with efficient redox cycling to active peroxydisulfate (PDS) in advanced oxidation processes for antibiotic removal. Herein, a surface-static synthesis strategy was employed to prepare a bimetallic core–shell catalyst (M@Z(Co 3 Zn 1 )). This strategy retained its original morphology and established synergistic Fe 2 + /Fe 3+ and Co 2+ /Co 3+ redox cycles to facilitate PDS activation. As a result, the M@Z(Co 3 Zn 1 )/PDS system achieved 97.6% tetracycline (TC) removal within 60 min, with a corresponding k obs value of 0.05742 min −1 , which is significantly higher than those of Z(Co 3 Zn 1 ) (77.1% and 0.01922 min −1 ), M(Fe) (62.0% and 0.01184 min −1 ) and catalysts reported in previous studies. The system maintained excellent stability over five consecutive cycles with low metal leaching. Furthermore, an extreme gradient boosting (XGBoost) model was developed to accurately predict catalytic performance under different operating conditions, demonstrating the potential of machine learning for catalyst-system optimization in wastewater treatment. This work provides a new strategy for the structural regulation of bimetallic MOF-derived catalysts and highlights the integration of machine learning with catalytic process design for antibiotic-contaminated water remediation.
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RSC Advances
·
2025
·Vol. 15
·期 25
·19826-19835
·
IF 4.6
Suxing Luo,Jiang Li,Meizhi Yang,Ping Zeng,Yuanhui Wu
Enhancing supercapacitor performance by incorporating heteroatoms into biochar represents a fascinating strategy. Our study presented an uncomplicated process for creating porous biochar simultaneously doped with nitrogen (N), phosphorus (P), and iron (Fe). The source material was excess sludge from sauce-flavor liquor production, which conveniently provided high initial N and Fe content for the resulting biochar. The phosphorus originated from phytic acid, while gentle activation was achieved using potassium carbonate (K2CO3). We found that adjusting the K2CO3 proportion and activation heating allowed precise control over the final material's characteristics, including its pore network, surface chemistry, plus the ultimate N, P, and Fe levels. Through electrochemical assessment, the N, P, Fe/BC-700-2 sample demonstrated superior performance, exhibiting a specific capacitance up to 141.7 F g−1 when tested at a 1 A g−1 current density in 6 M KOH electrolyte. This efficacy stemmed from several contributing elements: a large specific surface area (BET, 824.5 m2 g−1), abundant structural imperfections coupled with extensive mesoporosity, and advantageous synergistic effects arising from N, P, Fe co-incorporation. This investigation demonstrates that transforming sauce-flavor liquor excess sludge (SFLS) into heteroatom-enriched biochar not only offers significant promise for developing advanced supercapacitor electrode materials but also provides a sustainable pathway for valorizing problematic industrial waste.
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