ACS Applied Nano Materials
·
2026
·
IF 5.8
Yunying Wang,Yanyan Yu,Ying He,Yun Liu
Single-atom iron catalysts have emerged as promising mimics of oxidases; however, strategies to enhance their intrinsic catalytic activity remain underexplored. Herein, waste pitch and eggshells are utilized for fabricating high-performance nanozymes by coloading nanocopper and iron single atoms onto nitrogen-doped carbon nanotubes (Fe/Cu@NCNTs). It has been demonstrated that copper nanoparticles serve as a critical modulator, electronically tuning the iron sites, which increases the Fe2+/Fe3+ ratio and promotes the formation of Fe–Cu nanoalloys. These synergistic effects significantly enhance the oxidase-like activity of the catalyst. The optimized Fe/Cu@NCNTs exhibit a 48.7% higher specific activity and superior substrate affinity compared with the Fe@NCNTs counterpart. Leveraging this enhanced catalytic performance, a smartphone-assisted colorimetric sensing platform was developed for the rapid visual detection of multiple analytes. Furthermore, by incorporating a three-channel sensor array (TMB, ABTS, and OPD) with pattern recognition analysis, the platform accurately discriminates between nine antioxidants at concentrations as low as 10 μM. This work not only provides valuable insight into the mechanistic role of copper in enhancing the oxidase-like activity of iron single-atom catalysts but also offers a versatile and high-throughput sensing platform that advances the application of nanozymes in complex sample analysis.
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高影响因子
Journal of Environmental Sciences
·
2026
·
IF 6.5
Mingjun Xie,Yuying Han,Congting Sun,Shuyan Zang
Heterogeneous activation of peracetic acid (PAA) is promising for advanced water purification but still suffers from nonselective radical production, matrix interference, and inefficient electron transfer at poorly defined sites. Here, we design an asymmetric Fe–Co dual-atom catalyst (FeCo-DAC) anchored on N-doped porous carbon, effectively steering PAA activation toward a surface-confined, electron-transfer-dominated pathway. FeCo-DAC/PAA exhibits rapid bisphenol A (BPA) degradation ( k obs =1.90 min −1 ), surpassing single-metal counterparts (Fe-SAC 1.61 min −1 ; Co-SAC 0.41 min −1 ). EPR reveal O₂•⁻dominated and ¹O₂ dominated pathways on Fe‑SAC and Co‑SAC, respectively, while FeCo‑DAC indicating an interfacial electron‑transfer‑dominated mechanism. Mechanistic analyses reveal that electronically asymmetric Fe–N 4 and Co–N₃ sites cooperatively polarize adsorbed PAA to form a high-potential intermediate, enabling direct electron transfer from BPA within a closed interfacial loop with minimal radical release. The FeCo-DAC/PAA system efficiently degrades diverse micropollutants (BPA, BPS, BPC ≈ 100 %; RhB, SMX ≥96 %) and achieves robust TOC removal (52 %-63 %) in complex real-water matrices with low metal leaching (Fe²⁺ ≈ 78.4 μg/L; Co²⁺ ≈ 189.5 μg/L). Additionally, embedding FeCo-DAC into a PVDF membrane yields continuous-flow BPA removal (95 %-100 %) over 600 min, underscoring the practical potential of this asymmetric dual-site catalyst for sustainable, selective water purification.
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高影响因子
JOURNAL OF POWER SOURCES
·
2026
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IF 8.4
Xu Meng,Qingliang Guo,Zigeng Liu,Wei Wang
Developing low-cost, high-performance non-precious-metal catalysts for the oxygen reduction reaction (ORR) is crucial for clean-energy technologies. Herein, we propose a “monomer-coordination/in-situ polymerization” strategy in which inexpensive acrylonitrile monomers are pre-coordinated with Fe 3+ before radical polymerization, yielding uniformly Fe-doped polyacrylonitrile (PAN) (denoted Fe + PAN). Subsequent electrospinning and pyrolysis of this precursor afford Fe-N x nanofiber catalysts (denoted O-Fe-N-C). Compared with the conventional “polymerize-then-dope-Fe” route (denoted T-Fe-N-C), this approach markedly reduces the steric hindrance of PAN chains, strengthens Fe-N interactions, increases the density of Fe-N x active sites after pyrolysis, and suppresses Fe agglomeration. In 0.1 M KOH, O-Fe-N-C delivers an ORR half-wave potential of 0.878 V (vs RHE), outperforming commercial Pt/C. When employed as the air cathode in a Zn-air battery, the O-Fe-N-C cell exhibits an open-circuit voltage of 1.46 V and a peak power density of 133.91 mW cm −2 at 205.7 mA cm −2 , surpassing the Pt/C benchmark. This work provides a molecular-level design paradigm for scalable synthesis of low-cost, high-performance Fe-N x ORR catalysts.
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高影响因子
iScience
·
2026
·
IF 4.5
Zhen Zhang,Chenghui Luo,Mingxin Qin,Qvqv Jing,Lei Hao,Xinhua Xu
Fe-based single-atom catalysts (Fe-SACs) are able to enhance the Peroxymonosulfate (PMS) activation effectively just as a result of metal active sites that are precisely defined and atomically dispersed. The Fe 2 Co 1 CN catalyst synthesized in this work exhibits excellent catalytic activity toward PMS activation: the Fe 2 Co 1 CN/PMS system achieved nearly 100% 2-chlorophenol (2-CP) removal, a sharp contrast to only ∼1.5% removal by PMS alone. Corresponding, a mineralization rate of 78.3% was attained within 2 hours, coupled with extremely low metal leaching concentrations — evidencing the Fe 2 Co 1 CN catalyst’s superior structural stability and high catalytic efficiency in PMS activation. Together with its non-radical PMS activation mechanism, these merits highlight the catalyst’s potential as an efficient, stable, and selective candidate for practical wastewater treatment applications.
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高影响因子
MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Lili Zhang,Yiming Chen,Haowei Wang,Junyi Wang,Jun Shi,Qijian Niu,Xiuxiu Dong
Accurate detection of phthalic acid esters (PAEs) in food samples is critically important for food safety monitoring due to their endocrine-disrupting effects. A colorimetric (CL) sensing platform was developed, which shows universal response to all PAEs analytes. In the sensing system, Fe-MOFs with peroxidase-like (POD-like) activity catalyze H 2 O 2 to generate reactive oxygen species (ROS), which oxidize colorless 3,3′,5,5′-tetramethylbenzidine (TMB) into blue oxidation product (oxTMB). However, after the addition of PAEs, it will compete with TMB for active substances, resulting in a decrease in the generated oxTMB. Therefore, with the increase of PAEs concentration, the intensity of UV absorption peak attributed to oxTMB decreased. Taking dibutyl phthalate (DBP) as an example, the linear equation between absorption intensity ( A 652 ) and target concentration (1.0 × 10 −9 –5.0 × 10 −5 mol/L) was established. The correlation coefficient ( R 2 ) was 0.996, and the limit of detection (LOD) was 2.7 × 10 −10 mol/L. The signal response evaluation of multiple target PAEs was carried out separately. The CL sensing platform constructed using Fe-MOFs has been proved to be a reliable sensing system for the detection of DBP in real samples and yielded satisfactory recovery results. The successful application of this method for the detection of DBP in pakchoi, cherry tomato and fruit cucumber samples showed that it has the potential to detect PAEs in complex samples.
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高影响因子
TRIBOLOGY INTERNATIONAL
·
2026
·
IF 6.9
Chaobao Wang,Binlu Zhang,Jianzhe Huang,Jiale Chen,Yuyang Xi,Xinqi Zou
The mussel-inspired adhesion of polydopamine (PDA) provides a possibility for the formation of transferring lubrication films underwater. However, the inherent softness of PDA film limits its application in heavy-load lubrication situation. Therefore, a series of PDA@Fe core–shell nanoparticles were synthesized and their wettability and lubrication performance were evaluated. Compared to bare 304 stainless steel, the water contact angle of the PDA@Fe nanoparticle-coated surface is reduced from 86° to 48°. Tribological tests on steel–steel friction pairs show that, compared with deionized water, the PDA@Fe suspension reduces the friction coefficient and wear rate by up to 28.5 % and 56.6 %, respectively. Furthermore, EDS analysis reveals that PDA@Fe nanoparticles adhere to the worn surface and form a synergistic-adhesive and supportive lubricating film, in which Fe nanoparticles provide mechanical support and enhance PDA adhesion through ionic chelation. PDA, in turn, contributes hydration lubrication. This synergy results in highly efficient friction and wear reduction, suggesting that the multifunctional PDA@Fe nanoparticles offer an eco-friendly and durable solution for water-lubricated systems.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Zhihui Liu,Siyuan Sun,Fan Yang,Hongchen Liu,Yang Sun,Na Ta,Ge Zhang,Sai Che,Yongfeng Li
Transition metal-based (Fe, Co, Cu, etc.) single-atom catalysts (SAC) have been widely used in the direct oxidation of ethylbenzene and benzene. However, their catalytic performance is limited by the low metal loading. Compared with traditional SAC, dual site single-atom catalysts (DSAC) show the advantages of abundant active sites, high metal loading, and excellent catalytic performance. Herein, a novel Fe/Cu N C DSAC was prepared by facile one-pot pyrolysis of formaldehyde, dicyandiamide, and metal salts. Dicyandiamide acted as the carbon source with advantage of high nitrogen content, which promoted the formation of metal centers and increased the metal loading. Meanwhile, the synergistic effect between Fe and Cu active centers was revealed to adjust the coordination environment, thus improving the catalytic activity of oxygen activation. The synthesized Fe/Cu N C DSAC demonstrated superior catalytic performance in ethylbenzene oxidation reaction with O 2 as a green oxidant under mild reaction conditions, with a 99 % conversion of acetophenone and no significant degradation of activity after 10 circles. In addition, NaCl was added into the synthesis as a template to adjust the pore structure, and the modified Fe/Cu N C DSAC showed excellent performance in benzene oxidation reaction with high product conversion. In conclusion, this work paves the way for the construction of efficient, green, and cost-effective catalysts for the direct oxidation of ethylbenzene and benzene.
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高影响因子
Journal of the American Chemical Society
·
2022
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IF 16.383
Fei Xiao,Yian Wang,Gui-Liang Xu,Fei Yang,Shangqian Zhu,Cheng-Jun Sun,Yingdan Cui,Zhiwen Xu,Qinglan Zhao,Juhee Jang,Xiaoyi Qiu,Ershuai Liu,Walter S. Drisdell,Zidong Wei,Meng Gu,Khalil Amine,Minhua Shao
The poor durability of Pt-based nanoparticles dispersed on carbon black is the challenge for the application of long-life polymer electrolyte fuel cells. Recent work suggests that Fe- and N-codoped carbon (Fe–N–C) might be a better support than conventional high-surface-area carbon. In this work, we find that the electrochemical surface area retention of Pt/Fe–N–C is much better than that of commercial Pt/C during potential cycling in both acidic and basic media. In situ inductively coupled plasma mass spectrometry studies indicate that the Pt dissolution rate of Pt/Fe–N–C is 3 times smaller than that of Pt/C during cycling. Density functional theory calculations further illustrate that the Fe–N–C substrate can provide strong and stable support to the Pt nanoparticles and alleviate the oxide formation by adjusting the electronic structure. The strong metal–substrate interaction, together with a lower metal dissolution rate and highly stable support, may be the reason for the significantly enhanced stability of Pt/Fe–N–C. This finding highlights the importance of carbon support selection to achieve a more durable Pt-based electrocatalyst for fuel cells.
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International Journal of Environmental Science and Technology
·
2023
·Vol. 20
·期 11
·11865-11876
·
IF 3.1
Xin X.,Liu H.,Sun J.,Gao K.,Jia R.
The composite material based on N- , S- , and Fe-doped TiO 2 (NSFe-TiO 2 ) synthesized by wet impregnation was used as a photocatalyst to rapidly degrade sulfadiazine. The photocatalytic degradation behavior and mechanism of sulfadiazine on NSFe-TiO 2 were investigated for revealing the role of degradation under ultraviolet light. The results showed that compared with TiO 2 , NSFe-TiO 2 markedly improved the efficiency in photocatalytic degradation of sulfadiazine: more than 90% of sulfadiazine could be removed within 120 min by NSFe-TiO 2 dosage of 20 mg L −1 . The process conformed to first-order reaction kinetics model. The parameters such as loaded amount of NSFe-TiO 2 , solution pH value, humic acid concentration and recycle numbers on removal efficiency were also studied. Compared to neutral and alkaline conditions, acidic condition was not conducive to the photocatalysis. HA, Ca 2+ , Cu 2+ and Zn 2+ in the actual water body had mild inhibition on sulfadiazine degradation in UV/NSFe-TiO 2 system. Fragments screened by high-resolution mass spectrometry were conducted to explore the oxidation mechanism and pathways of sulfadiazine degradation. On the whole, UV/NSFe-TiO 2 photocatalysis has a good effect on sulfadiazine removal.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Bofang Shi,Hang Li,Xiaojie Fu,Chengcheng Zhao,Mingtao Li,Maochang Liu,Wei Yan,Honghui Yang
High energy consumption in pyrolyzing precursors for catalyst preparation would limit the application of nitrogen-doped carbon-based single-atom catalysts in actual pollutant remediation. Herein, we report an Fe single atom (7.67 wt %) loaded polyaniline catalyst (Fe-PANI) prepared via a simple impregnation process without pyrolysis. Both experimental characterizations and density functional theory calculations demonstrated that isolated −N═ group sites can fasten Fe atoms through Fe–N coordination in PANI, leading to a high stability of Fe atoms in a heterogeneous Fenton reaction. Highly dispersive yet dense −N═ groups in PANI can be protonated to be adsorption sites, which largely reduce the migration distance between reactive radicals and organics. More significantly, frontier molecular orbitals and spin-density distributions reveal that electrons can transfer from reduction groups of PANI to an Fe(III) site to accelerate its reduction. As a result, a remarkably boosted degradation behavior of organics under near-neutral conditions (pH 6), with low H2O2 concentration, was achieved. This cost-effective Fe-PANI catalyst with high catalytic activity, stability, and adsorption performance has great potential for industrial-level wastewater treatment.
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DIAMOND AND RELATED MATERIALS
·
2022
·
IF 3.806
Yan Wang,Guiyang Xian,Chongmei Wu,Zhaolin Zhu,Yin Liu,Zhenying Liu,Ling Bing Kong
An in-situ carbonization process was used to prepare nitrogen-doped Fe@C composites, from the complex matrix of polyaniline and iron, for electromagnetic wave (EMW) absorption. The basic idea is to introduce a variety of EMW absorption mechanisms, including dipole polarization due to the nitrogen doping and multiple interface reflection owing to the structural collapse. By adjusting the ratio of the components in the complex, EMW absorption performance of the final composites could be readily optimized while the mass ratio of Fe 2 O 3 /polyaniline was 0.6. Specifically, a reflection loss of −66.92 dB at 2.46 mm can be achieved, while an effective absorption bandwidth of 6.40 GHz (11.60 GHz–18.00 GHz) at 2.36 mm.
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JOURNAL OF MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Feihan Yu,Wenxuan Wang,Yudong Li,Minshu Du,Feng Liu,Daxin Liang
TiO 2 is one of the most ideal photocatalytic materials, but its application is limited by many problems (e.g., wide band gap, easy carrier recombination). Co-catalyst with changes in valence could efficiently overcome the disadvantages above. Herein, a Fe species (Fe, Fe 2 O 3 )/TiO 2 was designed to fully utilize photogenerated charges and holes. The degradation rate of ciprofloxacin can reach 99.97%. In addition, its methane generation from photoreduction of CO 2 is 12.9 times than that of pure TiO 2 . These results are attributed to the well-designed catalyst including the combination of TiO 2 and FeO x as photocatalysts and oxygen buffers, and the dispersion of single-atom Fe clusters as cocatalysts and electron trap sites. The effect mechanism of Fe species on TiO 2 was verified by PBE DFT calculation. Finally, following a concept of thermodynamic-kinetic synergy, a new design strategy for photocatalysts is accordingly proposed, as such, the prepared catalyst is expected to be applied in the environmental remediation.
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