ELECTROCHIMICA ACTA
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2026
·
IF 5.8
Mengfan Xu,Huangzhong Liang,Hao Zhou,Yongchun Bao,Jingzhi He,Linxia Bu,Rui Wang,Limei Duan,Quan Zhuang,Jinghai Liu,Yin Wang
This work regulates electronic structure and oxygen vacancies of Fe 2 O 3 via Nd-O-Fe 4f-2p-3d orbital coupling, promoting OER mechanism from AEM to LOM and clarifying the intrinsic catalytic origin. • The as-prepared Nd-Fe 2 O 3 @C shows low overpotential and favorable OER activity, with stable operation over 300 h at 10 mA cm -2 , presenting remarkably improved stability. • In-situ IR, in-situ Raman combined with DFT calculations demonstrate that Nd doping upshifts the Fe d-band center and reduces the Fe spin state, significantly lowing the adsorption energy of Fe 2 O 3 toward *OH and *O species. The development of highly active and stable non-precious metal-based catalysts for the oxygen evolution reaction (OER) is crucial for achieving efficient and low-cost hydrogen production through electrolysis. Herein, the temperature-programmed calcination approach is employed to synthesize the target catalyst of Nd-doped Fe 2 O 3 on graphitic carbon (Nd-Fe 2 O 3 @C). This Nd-Fe 2 O 3 @C presents excellent OER performance with a low overpotential of 359 mV at 10 mA cm −2 , a small Tafel slope of 70.31 mV/dec, and long-term stability (over 300 h). Tetramethylammonium hydroxide (TMAOH) measurements coupled with in-situ characterizations capture the dynamic evolution of key oxygen intermediates, verifying that Nd doping creates oxygen vacancies and thereby triggers the lattice oxygen oxidation mechanism (LOM). Density functional theory (DFT) calculations revealed that Nd doping increases antibonding orbital occupancy, which leading to weaker adsorption of oxygen intermediates and facilitate *OH and *O desorption during the OER. This work establishes oxygen vacancy engineering as effective strategy for robust water oxidation through LOM pathway. The Nd-Fe 2 O 3 @C with 4f–2p–3d gradient orbital coupling catalyst exhibits a low overpotential (η 10 = 359 mV), a small Tafel slope (70.31 mV dec -1 ) and outstanding long-term catalytic stability (300 h). DFT calculations demonstrate that Nd doping upshifts the Fe d-band center and reduces the Fe spin state, significantly lowing the adsorption energy of Fe 2 O 3 toward *OH and *O species. Download: Download high-res image (293KB) Download: Download full-size image
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Catalysts
·
2026
·Vol. 16
·期 9
·759
·
IF 4.5
Shuangyan Meng,Bin Liu,Jijie Zhao,Kaizhou He,Minglin Xie,Xiangqian Wang,Zhiwang Yang,Xiaoping Gao
Developing cost-effective photocatalysts with high activity remains a key challenge in photocatalysis. In this study, a low-cost nickel phosphide (Ni2P) cocatalyst was combined with MIL-53(Fe) to fabricate Ni2P/MIL-53(Fe) nanocomposites via a simple hydrothermal method. The as-prepared composites were systematically characterized by XRD, FT-IR, SEM, UV-vis DRS, PL, and EIS to evaluate their structural, morphological, optical, and electrochemical properties. The introduction of Ni2P significantly promoted the separation of photogenerated electron–hole pairs on the MIL-53(Fe) surface, thereby enabling valence band holes (h+) to participate in alcohol oxidation, as confirmed by photoelectrochemical analysis. Under optimized conditions, the Ni2P/MIL-53(Fe) nanocomposite achieved a significant photocatalytic alcohol conversion rate of 74%, which is 7.4-fold and 2.5-fold higher than those of pristine Ni2P and MIL-53(Fe), respectively. Furthermore, mechanistic studies revealed that valence band holes are primarily responsible for the selective oxidation of aromatic alcohols.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·
IF 3.9
Bao Zien,Ren Xiaohong,Rong Zeming
The selective upgrading of lignin-derived compounds into
high-value
chemicals remains a critical challenge. In this study, a series of
Ni-based catalysts supported on Hβ zeolite and modified with
secondary metals (Zn, Fe, and Cu) were synthesized and systematically
evaluated for the catalytic conversion of 4-propylguaiacol in aqueous
phase under hydrogen-free conditions. Among the catalysts studied
at 220 ° C for 2 h, Ni/Hβ delivered a conversion of 36.1%
and a phenolic selectivity of 89.6%. By comparison, NiZn/Hβ
exhibited the highest catalytic activity, achieving a conversion of
82.9% with a selectivity of 96.5%, indicating the promotional effect
of Zn incorporation. NiFe/Hβ showed a moderate conversion of
45.5% but maintained a high phenolic selectivity of 97.6%. However,
NiCu/Hβ showed almost no catalytic activity, with a conversion
of only 2.0%. Structural characterization by XRD, XPS, N 2 physisorption, H 2 -TPR, SEM, and TEM revealed that the
introduction of Zn significantly improved the dispersion of Ni species
and reduced Ni crystallite size, thereby increasing the number of
accessible active sites. In contrast, Fe incorporation altered the
catalyst structure and reduced catalytic activity, while Cu addition
induced metal aggregation and markedly suppressed catalytic performance.
The results indicate that appropriate second-metal modification can
effectively regulate the metal dispersion, microstructure, and metal–support
interactions in Ni/Hβ catalysts, thereby influencing the hydrogen
activation ability and the cleavage of Ar–CO 3 bonds.
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DESALINATION
·
2026
·
IF 9.9
Yuxuan Zhu,Haikuo Lei,Zengli Dai,Dong Liang,Quan Kang,Hongqing Lv,Huichao Su
A cathodic EMR equipped with highly dispersed Co/Fe-doped CoFeCM achieves 99.4% removal of high-concentration SMX. • FeCoN 6 -like local sites synergistically generate ·OH and O 2 · − for efficient removal. • Chitosan enhances metal anchoring and membrane flexibility, enabling low-cost fabrication. • Continuous-flow EMR realizes electrocatalytic oxidation and membrane separation in one single unit. To address the low efficiency and poor environmental safety of traditional technologies for degrading sulfamethoxazole (SMX), a cathodic electrocatalytic membrane reactor (EMR) was constructed by integrating CoFeCM as the cathode. CoFeCM was fabricated via a scalable mechanical ball milling-hot pressing‑carbonization route using chitosan-modified activated carbon as the substrate, where chitosan enhanced the anchoring of highly dispersed Co/Fe sites to suppress agglomeration and improved membrane mechanical flexibility. The equimolar Co₅Fe₅CM exhibited optimized porous structure (BET: 541.3 m 2 /g), excellent electrical conductivity (8542 S/m), and superior oxygen reduction reaction (ORR) activity. Under mild conditions (1.2 V, pH 3), the EMR achieved 99.4% removal of 100 mg/L SMX and 45.3% COD removal, with 12.4% TOC removal indicating effective transformation and partial mineralization. Mechanistic investigations confirmed that Fe Co sites formed a FeCoN 6 -like local structure with site-specific synergy. Fe sites thermodynamically favored 2e − ORR for efficient H 2 O 2 production, while Co sites kinetically promoted 1e − activation of H 2 O 2 to ·OH. ·OH and O 2 · − served as dominant active species, enabling multi-pathway SMX removal through sulfonamide bond cleavage and oxazole ring opening, with significantly reduced biotoxicity of intermediates. The EMR maintained stable removal efficiency (93.1% after 10-day continuous operation), and the concentrations of Co and Fe in the effluent were lower than the instrumental detection limit, and exhibited good universality for various refractory pollutants, providing a green, cost-effective, and scalable solution for antibiotic-contaminated wastewater treatment, and further demonstrates great potential for simultaneous organic pollutant elimination and salt rejection in high-salinity desalination wastewater systems, broadening the application boundary of electrocatalytic carbon membranes for seawater desalination and brine resource utilization. Download: Download high-res image (128KB) Download: Download full-size image
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CARBON
·
2026
·
IF 12.7
Jia-yuan Tian,Feng Lin,Jing-jing Wu,Pei Ma,Xiao-lin Xue,Yu-long Ma,Yong-gang Sun
Lignin is the most abundant renewable organic aromatic compound carbon source in nature, and it is of great significance to convert it into high-value fine chemicals. However, achieving this goal requires regulating the selectivity of the lignin hydrodeoxygenation (HDO) reaction is crucial to breaking the competitive relationship between C–O bond cleavage and aromatic ring saturation. This study proposes oxygen-philic-hydrogen activation dual-functional site synergy strategy, using NiCoAl-LDH as the precursor, and constructing a NiCoMoFeAlO x multi-metal oxide catalyst by introducing Mo and Fe. Experiments and DFT calculations show that the catalyst achieves precise coupling of depolymerization and deoxygenation through a tandem synergy mechanism, the NiCo sites efficiently activate H 2 to supply active hydrogen, the oxygen-philic Mo sites and Fe selectively adsorb and cleave C–O bonds, and the intermetallic synergy effectively inhibits excessive hydrogenation of aromatic rings, directing the reaction path to phenolic products with retained aromatic rings. In the real lignin HDO reaction, the catalyst achieves a liquid yield as high as 78% and 64.9% selectivity for C 6+ cyclohexanol. This research provides a new paradigm for the rational design of multi-functional catalysts and the realization of directed conversion of lignin. Download: Download high-res image (244KB) Download: Download full-size image
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NUCLEAR TECHNOLOGY
·
2025
·
IF 2
Qianwen Wang,Dingcheng Wang,Jinfeng Li,Bo Tian,Zhigang Li,Jianwei Zhang,Wenze Li,Nan Zhang,Yunchen Du,Hongtao Zhao
The extraction and recovery of uranium play a crucial role in ensuring the sustainable supply of nuclear energy and safeguarding environmental security. The ideal uranium adsorbent should have high adsorption capacity, excellent selectivity, and good reusability. In this study, by employing the strategy of using MIL-100(Fe) as an intermediate linker, the core shell, structured of Fe3O4@NiFe-LDH, was successfully accomplished via a solvothermal method. The as-prepared Fe3O4@NiFe-LDH shows great potential in the field of uranium adsorption.On one hand, MIL-100(Fe) can act as an iron source for NiFe-LDH, making the core-shell structure more stable. It was observed that after four adsorption-desorption cycles, the adsorption efficiency of Fe3O4@NiFe-LDH could still reach 75% in the fifth cycle. By contrast, materials without the MIL-100(Fe) intermediate layer exhibited a relatively lower adsorption cycle efficiency for three cycles. On the other hand, the porous structure of metal organic framework (MOF) doubles the specific surface area of Fe3O4@NiFe-LDH compared to Fe3O4/NiFe-LDH without a MOF intermediate layer.The abundant hierarchical pore structure further enhances the performance of Fe3O4@NiFe-LDH from 615.6 mg·g−1 of Fe3O4/NiFe-LDH(8:1) to 862 mg·g−1. Additionally, in-depth studies on adsorption kinetics and adsorption thermodynamics suggest that the adsorption process is more inclined to monolayer adsorption and is dominated by chemical adsorption, which is a spontaneous endothermic process. When conducting ion competition tests on the adsorbent, it was found that the adsorbent has high adsorption selectivity for U(VI) and good regeneration ability. Therefore, the addition of the intermediate MOF improves the adsorption capacity and stability of the material, indicating that Fe3O4@NiFe-LDH has potential advantages in practical applications.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Yan Wang,Tengfei Deng
A series of ferrite ceramics with the chemical formula Fe(Cr x Fe 2− x )O 4 ( x = 1.5, 1.6, 1.7, 1.8, 1.9) were synthesized using the solid-state reaction method. Rietveld refinement of the x-ray diffraction patterns confirmed the formation of a pure cubic spinel structure, with the lattice parameters decreasing as the Cr 3+ content ( x ) increased. Raman spectroscopy revealed the splitting of the A 1 g ${{{\mathrm{A}}}_{1{\mathrm{g}}}}$ vibrational mode into two distinct bands at 670 and 710 cm −1 that were attributed to the symmetric stretching vibrations of Fe 2+ –O and Fe 3+ –O bonds, respectively. This supports a mixed spinel-type cation distribution in which Cr 3+ and a fraction of Fe 2+ ions occupy octahedral sites, whereas Fe 3+ and the remaining Fe 2+ ions occupy tetrahedral sites. With increasing chromium content, the dielectric constant and loss tangent both decreased. Magnetic measurements showed a reduction in the remnant magnetization and coercivity. Furthermore, the samples demonstrate behavior that tends toward a superparamagnetic response. This study systematically established the relationship between the Cr/Fe ratio and the resulting structural, dielectric, and magnetic properties, underscoring the important role played by cation distribution in tuning the material properties of these ferrite ceramics.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 30
·1-21
·
IF 2.8
Yang Minjie,Zou Congyang,Ji Yufeng,Liu Ruijie,Xu Ying
A novel MIL-101(Fe)/Bi₂S₃ Z-scheme heterojunction with a metal–organic framework (MOF) structure was synthesized via a solvothermal method. Compared with pristine MIL-101(Fe) and pristine Bi₂S₃, this composite exhibits a significant breakthrough in degradation performance toward rhodamine B (RhB) and tetracycline hydrochloride (TCH). Specifically, it achieves a degradation efficiency of 95.7% for 20 mg/L TCH within 120 min and 98.6% for 40 mg/L RhB within 90 min.Characterizations including X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet–visible diffuse reflectance spectroscopy (UV–Vis DRS), and electrochemical impedance spectroscopy (EIS) confirm that the MOF structure of MIL-101(Fe) provides a stable support matrix for Bi₂S₃. Moreover, the construction of the Z-scheme heterojunction can effectively suppress the recombination of photogenerated electron–hole pairs while retaining the strongly oxidizing hydroxyl radicals (・OH) and strongly reducing superoxide radicals (・O₂⁻). More importantly, after five recycling cycles, the degradation efficiencies of the composite for TCH and RhB remain at 86.8% and 88.6%, respectively, with no obvious damage to its crystal structure after cycling. This demonstrates superior structural stability and reusability compared to most reported MOF-based photo-Fenton catalysts.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Xing Wei,Yaling Ye,Wanling Cai,Zuliang Chen
Antibiotics like doxorubicin hydrochloride (DOX) are widely used in medicine, but their environmental residues pose risks to human health and ecosystems. This study optimized the synthesis of C-Fe₃O₄@ZIF-8 composites using response surface methodology (RSM) to enhance DOX release efficiency, thereby mitigating environmental antibiotic contamination. Under optimized conditions (37 °C, pH 5.0), the C-Fe₃O₄@ZIF-8 composite achieved a significant increase in cumulative DOX release, from 40.8% to 61.1%. The pH-responsive release further validated the optimization strategy. Characterization via scanning electron microscopy (SEM) and X-ray diffraction (XRD) revealed a structural transformation from rhombic dodecahedral crystals to more stable spherical particles with enhanced crystallinity. Fourier-transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) confirmed an increase in surface-active sites and oxygen-containing functional groups, contributing to improved drug release efficiency. These findings provide valuable insights into optimizing C-Fe₃O₄@ZIF-8 for drug delivery, advancing environmentally friendly antibiotic management strategies.
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Journal of Energy Storage
·
2025
·
IF 9.8
Jianchi Wang,Xusheng Cheng,Liwei Wang
All-soluble all-iron redox flow batteries (RFBs) are among the most promising energy storage technologies due to their low cost, dendrite-free operation, and decoupled capacity and power. In particular, the Fe(TEA) 3+/2+ redox couple has attracted significant attention owing to its appropriate redox potential, fast kinetics, and excellent reversibility. However, the instability of Fe(TEA) chelates, caused by the competitive adsorption of free TEA ligands, remains a major challenge that limits cycling stability and energy efficiency. Herein, we propose a green and efficient strategy to fabricate Nitrogen-doped graphite felt (N@GF) as the anode for the Fe(TEA)-based system and identify the optimal doping concentration. The abundant nitrogen-containing functional groups endow the felt with synergistic electronic modulation and surface coordination capabilities, enabling selective Fe(TEA) complexation while suppressing the undesired adsorption of free TEA ligands by occupying the limited active sites. This tailored interfacial regulation stabilizes Fe(TEA) complexes and enhances charge-transfer efficiency. As a result, the battery employing 5 %N@GF as the anode operates stably for over 950 deep charge–discharge cycles (near 260 h) at 80 mA cm −2 , exhibits significantly reduced polarization compared to pristine GF, achieves a peak energy efficiency above 78 % and a capacity utilization exceeding 83 %. This work offers an eco-friendly and effective material design strategy for improving both the energy efficiency and cycle life of all-soluble all-iron redox flow batteries.
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DESALINATION
·
2025
·
IF 9.8
Shuyu Liu,Liang Tian,Lihua Han,Qing Li,Liangliang Zhu,Su Chen
The conversion of waste plastics into metal-organic framework (MOF) photothermal materials presents promising opportunities for solar energy conversion, facilitating freshwater production and water purification through interfacial solar evaporation, and simultaneously heralding advancements in plastic waste recycling. Herein, we present a bimetallic Co/Fe-MOF photothermal converting material derived from PBAT-based plastic wastes, tailored for efficient solar water evaporation. The nanosheet-structured bimetallic Co/Fe-MOF featuring high light absorption, water wettability and photothermal conversion efficiency delivers an optimal evaporation rate of 1.81 kg m −2 h −1 under one sun irradiation, surpassing that of monometallic MOFs. Moreover, we employed three substrates—nanofiber film, aerogel, and hydrogel—to immobilize the Co/Fe-MOF solar absorbers, thereby constructing monolithic hybrid solar evaporators. These substrates not only confer the flexibility to Co/Fe-MOF solar absorbers for practicability but also serve as mediates to regulate thermal management and water states. Consequently, the hybrid evaporators exhibited significantly enhanced evaporation rates, with the hydrogel evaporator achieving to ~3.53 kg m −2 h −1 , coupled with remarkable salt resistance and durability. This bimetallic Co/Fe-MOF-based solar evaporator efficiently serves a dual purpose, enhancing clean water production through solar desalination and purification while also presenting a viable alternative to the issue of plastic waste, potentially harmonizing energy, environment and clean water nexus.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Rui Ming,JingJing Du,Shaobo Ye,Zhao Liang,Qiao Liu,Xuyang Lu,Qiliang Wei,Weiyou Yang,Qing Shi
The design of efficient and cost-effective bifunctional catalysts to replace precious metal-based catalysts remains a critical challenge in electrocatalytic water splitting. Herein, we report a Mo-Fe co-doped Ni 3 S 2 nanorod arrays grown on a nickel-iron foam substrate via a facile hydrothermal synthesis. This dual metal-doped nanorod structure synergistically modulates the electronic structure while maximizing accessible active sites, endowing the Mo-Fe-Ni 3 S 2 electrode with exceptional bifunctional activity for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline media. The resulting Mo-Fe-Ni 3 S 2 electrode requires only 180 mV for HER and 275 mV for OER at a current density of 100 mA cm −2 , coupled with long-term stability exceeding 50 h. Remarkably, when integrated into a single-stack cell for practical application, the Mo-Fe-Ni 3 S 2 electrode exhibits outstanding performance, achieving a current density of 100 mA cm −2 at a potential of 1.87 V and showing no potential degradation after 100 hours of continuous operation at 100 mA cm −2 . This work not only presents a high-performance bifunctional catalyst but also provides fundamental insights into the design of advanced electrocatalysts through rational heteroatom doping strategies.
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