Nature Communications
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2024
·Vol. 15
·期 1
·1-10
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IF 14.7
Bai Jingsen,Zhao Tuo,Xu Mingjun,Mei Bingbao,Yang Liting,Shi Zhaoping,Zhu Siyuan,Wang Ying,Jiang Zheng,Zhao Jin,Ge Junjie,Xiao Meiling,Liu Changpeng,Xing Wei
The limited durability of metal-nitrogen-carbon electrocatalysts severely restricts their applicability for the oxygen reduction reaction in proton exchange membrane fuel cells. In this study, we employ the chemical vapor modification method to alter the configuration of active sites from FeN 4 to the stable monosymmetric FeN 2 +N’ 2 , along with enhancing the degree of graphitization in the carbon substrate. This improvement effectively addresses the challenges associated with Fe active center leaching caused by N-group protonation and free radicals attack due to the 2-electron oxygen reduction reaction. The electrocatalyst with neoteric active site exhibited excellent durability. During accelerated aging test, the electrocatalyst exhibited negligible decline in its half-wave potential even after undergoing 200,000 potential cycles. Furthermore, when subjected to operational conditions representative of fuel cell systems, the electrocatalyst displayed remarkable durability, sustaining stable performance for a duration exceeding 248 h. The significant improvement in durability provides highly valuable insights for the practical application of metal-nitrogen-carbon electrocatalysts.
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Journal of Environmental Chemical Engineering
·
2025
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IF 7.2
Xiteng Yan,Xiaohan Chen,Runping Ye,Jingwen Tao,Gang Feng,Feiyang Hu,Honglin Hu,Claudia Li,Kang Hui Lim,Tao Wen,Yuan Wang,Xinhao Li,Rongbin Zhang,Sibudjing Kawi
Ammonia (NH 3 ) decomposition is a practical approach to overcome the challenges associated with hydrogen storage and transportation. The choice of catalyst and understanding the catalytic mechanism are key factors in optimizing H 2 production by NH 3 decomposition performance. In this work, a series of alkali metal-doped Fe-based catalysts were synthesized via a solvothermal method, and the formation of Fe x N active phases was systematically investigated. The Fe-based catalysts were pretreated under different atmospheres (H 2 , NH 3 , and N 2 ), followed by comprehensive characterization using BET, XRD, SEM, NH 3 -TPD, XPS, and other techniques. The optimized catalytic activity for NH 3 decomposition was attributed to the formation of Fe x N active phases, and the formation pathway of Fe x N active phases and their catalytic promotion mechanism were further elucidated through XRD, NH 3 -TPD-MS, and XPS analyses. Significantly, catalysts treated with pure NH 3 exhibited an increase in the electron density of Fe species and a decrease in the apparent activation energy. The incorporation of alkali metal doping further amplified this effect, ultimately leading to enhanced hydrogen production performance from NH 3 decomposition. This work underscores the critical function of the Fe x N active phase in facilitating efficient NH 3 decomposition for hydrogen generation, offering invaluable insights into the development of sophisticated alkali metal-doped Fe-based catalysts.
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Environmental Technology & Innovation
·
2024
·
IF 6.7
Liangquan Lu,Jianhong Bi,Asfandyar Shahab,Hua Zhang,Saeed Rad,Zhenyu Wu
s This study investigates the influence of key factors on the structure of prepared MgFe-LDH and their application for the removal of methyl orange (MO). The optimal synthesis were determined through Scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), and partition coefficient (PC) analysis to study the morphology, crystallinity, and physicochemical properties of the resulting materials. Under the conditions of Mg 2+ /Fe 3+ =4, pH=11, and aging temperature of 80℃, well-structured Mg 4 Fe-LDH-11–80℃ was successfully synthesized with a theoretical maximum adsorption capacity of 1688.22 mg/g for MO. The adsorption process follows the Redlich-Peterson and Avrami models, displaying a exothermic characteristic. The outstanding adsorption capability is likely attributed to the synergistic effects of electrostatic attraction, hydrogen bonding, complexation reactions, and ion exchange mechanisms. Furthermore, cost analysis and recycling experiments indicate that the prepared LDH material is cost-effective and suitable for multiple reuse cycles, making it a promising candidate for treating wastewater containing MO dyes.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Li Yang,Wei-Hua Zhang,Yan Li,Yan-Li An,Ye-Ming Wu,Ning Gu,Gao-Jun Teng
Noninvasive therapies such as photodynamic therapy (PDT) and chemodynamic therapy (CDT), which rely on reactive oxygen species (ROS), are gaining attention for their low toxicity. However, single-modal treatments have individual limitations that restrict the therapeutic efficacy. Fe(III) can coordinate with the hydrophilic regions of indocyanine green (ICG) molecules to form the ICG/Fe(III) complex, making it a promising dual-modal agent for combined PDT and CDT. However, coordination with Fe(III) leads to the aggregation quenching of ICG, hindering its application in dual-modal therapy. We innovatively utilize oxygen nanobubbles, prepared solely from water and oxygen, to significantly reverse the aggregation-induced quenching of the ICG/Fe(III) complex, thereby enhancing its stability in aqueous environments. In this system, Fe(III) assembles at the nanobubble interface, coordinating with ICG’s hydrophilic regions to form the ICG/Fe(III)-NBs. The oxygen nanobubbles boost PDT efficiency by improving the ICG/Fe(III) complex stability and oxygen content, while Fe(III) achieves CDT by generating hydroxyl radicals (•OH) through the Fenton reaction. This dual-modality treatment significantly disrupts the tumor’s redox balance, induces ferroptosis, and demonstrates strong antitumor efficacy, reducing tumor volume to 34% of its initial size in mice. The strategy offers a promising and clinically viable approach to cancer treatment.
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FOOD CHEMISTRY
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2018
·
IF 4.946
Nan Wang,Huijuan Chai,Xuelin Dong,Qian Zhou,Lihua Zhu
Iron(III) ethylenediaminetetraacetate (Fe(III)EDTA) is widely used in iron fortification for reducing iron deficiency, and its determination is urgently needed. The present work developed a fluorescent method to straightforwardly determine Fe(III)EDTA by using photoluminescent carbon dots (C-dots) with the aid of F − ions as the masking agent of free Fe 3+ ions. In the presence of F − ions, only Fe(III)EDTA selectively quenched the photoluminescence of C-dots, and both Fe 3+ and Fe 2+ as well as other carboxylic acids have no effect on the emission of C-dots. The sensing mechanism was attributed to the ligand-tailored electron transfer process from C-dots to Fe 3+ . Under optimum conditions, this method showed a linear calibration plot over the Fe(III)EDTA range of 1.0–200 μmol L −1 and a detection limit of 0.4 μmol L −1 . The proposed method was successfully applied to determine Fe(III)EDTA in real samples with acceptable recoveries of spikes (95%−110%) and repeatability (RSD, 4.2%−9.5%).
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Rui Cai,Ping-an Yang,Haibo Ruan,Xin Huang,Zhihao Zhou,Qiao Chen,Yuxin Zhang,Xinglong Gong,Yingang Gui,Rui Li
How to prepare materials according to the target properties has been a hot research topic. In this paper, the target electromagnetic parameters are obtained according to the performance requirements, and the nanoflower rod-like, low-density mulberry-like and high-density mulberry-like one-dimensional (1D) core–shell structured Fe@Ni ( x ) nanowires (NWs) are prepared by liquid-phase reduction method. The effective absorption bandwidth (EAB) of sample Fe@Ni (40) in the low-frequency (2–8 GHz) is up to 1.89 GHz (3.1 mm). Sample Fe@Ni (60) is able to reach a maximum EAB of 3.18 GHz at a thickness of 0.9 mm. Concisely, the sample has the ability to absorb microwaves in low frequency bands and ultra-thin thicknesses. The reason can be attributed to the strong magnetic coupling brought by the bimetallic composition to strengthen the resonance level and the excellent 1D core–shell structure to enhance the efficiency of polarization loss. In conclusion, Fe@Ni ( x ) provides a technological route for the preparation of low-frequency and ultra-thin-thickness absorbers.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Na Liu,Yinhui Li,Minggu Zhang,Naiju Che,Xianliang Song,Yanli Liu,Chengliang Li
As the substitutes of legacy long-chain per-/polyfluoroalkyl substances (PFASs), short-chain PFASs have been widely detected in the environment. Compared to long-chain PFASs, short-chain PFASs have smaller molecules and are more hydrophilic. Therefore, they are more likely to experience long-distance transport and pose lasting environmental impacts. In this study, Fe-doped (R-Fe) and Cu-doped biochars (R-Cu) were prepared using reed straw biochar (R). The results showed that the PFBA and PFPeA sorption capacities of R-Fe were 25.81 and 43.59 mg g −1 , 1.65 and 1.55 times higher than those of R, respectively. The PFBA and PFPeA sorption capacities of R-Cu were 19.34 and 33.69 mg g −1 , 1.24 and 1.20 times higher than those of R, respectively. In addition, R, R-Fe, and R-Cu exhibited higher PFBA and PFPeA sorption capacities than the biochars previously reported. The excellent PFAS sorption performances of the biochars were attributed to the highly porous structure of R, which provided rich adsorption sites. Ion-pair sorption, pore filling, electrostatic interaction between the Fe/Cu and cationic groups on biochar and the anionic groups of PFASs, and hydrophobic interaction between the hydrophobic surface of biochar and the fluorinated tails of PFASs were the underlying sorption mechanisms. The biochars presented high removal rates (>86 %) of multiple PFASs (∑PFAS: 350 μg L −1 ) from synthetic wastewaters, including legacy and emerging PFASs of different chain lengths and with different functional groups. The biochars reported in this study are promising candidate adsorbents for treating waters contaminated with short-chain PFASs.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2024
·Vol. 26
·期 2
·1-13
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IF 2.1
Ye Haiyang,Zhang Li,Qiu Xiaonan,Qiu Jianghong,Xu Wenqing,Xu Xiao,Yu Huijun,Zou Shengqiang,Du Fengyi,Zheng Guojun,Wu Yunchao
Photothermal therapy (PTT) can kill the tumor in situ, but fail to trigger strong antitumor immune response against its recurrence and metastasis. Herein, mannose-grafting Fe-doped carbon dots (M/Fe-CDs) were prepared via hydrothermal carbonization and chemical modification. The prepared M/Fe-CDs had characteristics of excellent optical qualities, good water solubility, and outstanding biocompatibility. Compared with pure CDs, the doping of Fe atom endowed the M/Fe-CDs with a high photothermal conversion efficiency (from 12.1 up to 30.1%). Under 808-nm NIR irradiation, the M/Fe-CDs could lead to local hyperthermia to kill tumor cells. Importantly, the M/Fe-CDs were capable of loading CpG-ODNs via electrostatic absorption and delivering them into the cytoplasm of dendritic cells (DCs). Finally, the CpG-ODNs-loading M/Fe-CDs could significantly increase the CD80/86 expression on the DCs surface. These results demonstrated that the M/Fe-CDs could be used as a versatile nanoplatform to combine the PTT and immune activation for tumor treatment.
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METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2024
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IF 2.4
Zhang Xu,Zhang Liqi,Huang Bowen,Yang Yusheng,Zhao Zengwu
Materials like metallic iron and its alloys are essential to daily living and industrial production. The benefits of using electrolysis technology to prepare iron and its alloys are great efficiency, controllability, and environmental protection. This study focuses on the feasibility of the electrochemical method for the direct preparation of metallic iron and Si–Fe alloys in iron ores with high fluoride content. The electrochemical behavior of Fe(II) and Fe(III) in molten SiO 2 –CaO–CaF 2 slag on tungsten electrodes was investigated by using cyclic voltammetry and square wave voltammetry methods. It was determined that the reduction of Fe(II) ions follows a one-step two-electron transfer process: Fe(II) + 2e − → Fe(0). The reduction of Fe(III) involves a two-step electron transfer process: Fe(III) + e − → Fe(II) and Fe(II) + 2e − → Fe(0), respectively. The Fe(II)/Fe(0) process is an irreversible reaction controlled by diffusion. The diffusion coefficient of Fe(II) is D Fe(II) = 1.5 × 10 −6 cm 2 s −1 . The cathodic deposits of iron were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) combined with energy dispersive X-ray spectroscopy (EDS). The findings indicate that the production of Fe 2 Si alloy through electrolysis is more favorable when Fe(II) is present in the slag, while the production of metallic iron is more favorable when Fe(III) is present in the slag. This work provides a basis for the electrochemical direct preparation of Fe–Si alloy and metallic iron in high fluorine iron ore.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Feng Zhang,Xiaodong Zhang,Pengyu Han,Jiali Cui,Chaoxu Wang,Qibin Chen
In this study, Pt@MOF(Fe)/NF, which was successfully employed as the cathode in the investigation of electrochemical activation of persulfate (PDS) for degradation of tetracycline hydrochloride (TCH), was successfully prepared by loading Fe-MOF and Pt on NF substrate using hydrothermal method. The loading of Fe-MOF and Pt increases the active site as well as the charge transfer ability, endowing the materials with high catalytic activity. The results revealed a synergistic reinforcing effect in the electrochemical activation of PDS, and the strong oxidizing substances generated by the activation of PDS on the cathode surface facilitated the degradation of TCH. The main active substances are SO 4 − . and OH . , primarily ·OH. The optimal degradation conditions include a current density of 20 mA/cm 2 , an initial concentration of PDS of 5 mmol/L, and an initial pH of 7. The degradation rate of TCH in the activation of PDS based on Pt@MOF(Fe)/NF reached 77.2 % after 120 mins of degradation under the optimal conditions, 32.7 % higher than that of the NF cathode system. In the degradation process of TCH, its characteristic functional groups are attacked and destroyed by active substances such as SO 4 − . and OH . , producing intermediates with structures similar to TCH, followed by further mineralization.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Junyu Zhang,Mingye Yang,Teng Huang,Jinwei Sun,Wenyu Hu,Yangyang Li,Fuyuan Yang,Minggao Ouyang
Hydrogen production from alkaline water electrolysis (AWE) has promising potential in energy storage due to the advantages of low cost and large scale, but its bottleneck is the low current density and poor durability of non-precious metal electrodes. Although numerous electrode designs with superior activity have been reported, the complicated synthesis process and refined microstructure have not changed the high preparation cost, high resistance, and poor durability of conventional AWE electrodes. Here, we report an efficient synthesis strategy of high-density Ni-Fe-Ru electrode (particle size < 5 nm) and explore the synergistic effect between Ni-Fe-Ru elements at different potentials. The electrode exhibits excellent OER activity (264 mV@100 mA cm −2 , Tafel slope = 49 mV dec −1 ) and AWE performance (400 mA cm −2 @1.89 V), it can work stably for 300 h at 500 mA cm −2 , with potential for industrial applications.
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Journal of Functional Biomaterials
·
2024
·Vol. 15
·期 7
·185
·
IF 5
Yu Wu,Sen Xu,Fengjuan Ding,Weibing Zhang,Haiyan Liu
In this work, a new type of FE-1 COF material is prepared by a reversible imine condensation reaction with diaminoferrocene and diaminodiformaldehyde as materials. The material is connected by imine bonds to form a COF skeleton, and the presence of plenty of nitrogen-containing groups gives the material good hydrophilicity; the presence of metal Fe ions provides the material application potential in the enrichment of phosphopeptides. According to the different binding abilities of N-glycopeptide and phosphopeptide on FE-1 COF, it can simultaneously enrich N-glycopeptide and phosphopeptide through different elution conditions to realize its controllable and selective enrichment. Using the above characteristics, 18 phosphopeptides were detected from α-casein hydrolysate, 8 phosphopeptides were detected from β-casein hydrolysate and 21 glycopeptides were detected from IgG hydrolysate. Finally, the gradual elution strategy was used; 16 phosphopeptides and 19 glycopeptides were detected from the α-casein hydrolysate and IgG hydrolysate. The corresponding glycopeptides and phosphopeptides were identified from the human serum. It proves that the FE-1 COF material has a good enrichment effect on phosphopeptides and glycopeptides.
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