TALANTA
·
2026
·
IF 6.7
Xiao Ma,Junjie Wang,Xin Chen,Jingcheng Li,Jiaqi Xue,Yufan Hou,Shihao Zhao,Jingxiang Zhao,Xiaomi Meng,Huajun Chen,Fang Wang,Fangya Guo,Jian Sun,Dan Zhao
Oxidase-like nanozymes use dissolved O 2 as the terminal electron acceptor and do not require exogenous H 2 O 2 , offering methodological advantages; however, conventional “one-pot carbonization” often causes concurrent carbonization and active-site formation, making the coordination environment difficult to control. Here, a sequential “pre-coordinate-polymerize-pyrolyze” site-engineering route was developed. On carbon black, OPD-Fe 3+ pre-coordination and in situ oxidative polymerization were carried out, followed by thermal treatment and purification, by which Fe–N moieties were immobilized within the shell region of the material to afford highly dispersed Fe–N x moieties predominantly featuring Fe–N 4 -like coordination (Fe–N 4 @CB d ). Multiscale characterization (XRD/XPS/XANES/EXAFS) consistently showed that iron resided predominantly in a first coordination sphere dominated by Fe–N (coordination number CN ≈ 3.7; R ≈ 2.01 Å), with no resolvable Fe–Fe scattering and only minor, non-dominant Fe-containing phases. ROS-trapping and time-dependent EPR measurements further confirmed continuous O 2 activation with the generation of O 2 • - , •OH, and 1 O 2 in the Fe–N 4 @CB d /O 2 system. DFT calculations additionally supported Fe–N 4 -like Fe–N x sites as the most plausible dominant active structures for O 2 activation. Under a unified TMB/O 2 system, steady-state enzyme kinetics exhibited outstanding performance, with V max = 351 nmol L −1 s −1 and K m = 0.56 mM, which are competitive among reports using the same substrate/readout. An H 2 O 2 -free colorimetric platform for alkaline phosphatase (ALP) was constructed on this material, achieving a low limit of detection and good linearity; acceptable accuracy and precision were verified by standard additions in diluted serum. This sequential strategy predefines the Fe–N neighborhood and topology at the precursor stage, reduces uncertainty in site formation, and avoids metal-organic framework (MOF)/hard-template/ionic-liquid multi-step procedures, thereby providing a strong basis for reproducible Fe–N 4 -like/Fe–N x oxidase-like nanozyme preparation and streamlined, robust bioanalysis.
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高影响因子
Journal of Materials Chemistry A
·
2026
·
IF 9.2
Yangyang Zhao,Yijian Wang,Xiaoyu Wang,Xingchen Feng,Tao Cong,Juntao Feng,Pei Wang,Kai Yang,Xifeng Ding
Solid oxide electrolysis cells (SOECs) offer a promising route for electrochemical CO 2 conversation to sustainable fuels, but their widespread adoption is hindered by the lack of cathodes combining high catalytic activity and stability. To address this challenge, we developed an in-situ interface-engineered La 0.6 Sr 0.4 Fe 0.95 Ti 0.2 O 3-δ cathode (R-LSF 0.95 T) cathode featuring exsolves Fe nanoparticles. The optimized R-LSF 0.95 T-based cell delivers a current density of 780 mA cm -2 at 1.5 V and 800 °C in pure CO 2 atmosphere, representing a 23.2% improvement over mechanically mixed electrode. This performance enhancement arises from synergistic metal-oxide hetero-interfaces, where the reduced perovskite substrate promotes CO 2 adsorption and oxygen-ion transport, while the Fe nanoparticles provide abundant active sites and reduce activation barrier for CO 2 reduction. Notably, the Fe-decorated perovskite demonstrates superior carbon deposition compared to Ni-based cathodes owing to its moderate activity. Consequently, the electrolysis cell maintains exceptional stability over 100 h at 1.5V and 800 ℃, with interfacial robustness further enhanced through redox cycling due to reinforced anchoring effect with more minute Nano-Fe exsolution. This work establishes a novel materials design paradigm that reconciles the activity-stability trade-off in SOEC cathodes through the combination of moderately active catalysts with interface reinforcement, offering new pathways for developing durable, high-performance CO 2 electrolysis systems.
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CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Jingbo Wang,Yingzhe Bao,Xiulan Ma,Shan Jiang,Ziyue Zhou,Bo Wang
Norfloxacin (NOR) is widely used in aquaculture; however, its overuse has been shown to cause water pollution. In this research, NOR was chosen as the target pollutant, and agricultural waste, specifically corn cobs, was used to prepare ferromagnetic iron-manganese composite modified biochar (FMBC) for adsorbing NOR from aquaculture wastewater. The adsorption mechanism was explored using various characterization techniques and evaluating the adsorption performance. The results indicate that the optimal modification conditions for FMBC include an iron source concentration of 0.3 M, the iron-manganese ratio is 3:1, with a calcination temperature of 350°C. At pH 6, FMBC achieved an adsorption capacity of 31.17 mg/g for NOR, which is approximately 85.5% and 49.14% higher than that of pristine biochar (BC) and iron-modified biochar (FBC), respectively. The adsorption process obeyed pseudo-second order kinetics and the Langmuir isotherm model. As the temperature increased, the adsorption capacity of FMBC for NOR decreased. The adsorption capacity of FMBC for NOR increased at low concentrations of Cu 2+ (maximum 25 mg/L), but at higher concentrations, it was inhibited. FMBC demonstrated the capacity to maintain NOR removal performance at a rate of greater than 50% following five cycles. The adsorption processes of FMBC for NOR are driven by several factors: pore filling, electrostatic adsorption, hydrogen bonding, surface complexation, π-π interactions, and hydrophobic bonding. In summary,this novel composite material offers promising prospects for mitigating water pollution in aquaculture, making it a cost-effective and sustainable alternative.
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Tao Wen,Xiaoyan Yang,Yanwei Yuan,Xiaoke Lv,Zhen Wang,Tianmeng Zhang,Bin Wu,Jianjun Chen
With the widespread proliferation of electronic and intelligent devices, increasingly stringent requirements have been imposed on microwave absorption materials. Ti 3 C 2 T x MXene is considered a promising microwave absorbing material with excellent properties. However, its high electrical conductivity and monotonous loss mechanism restrict its development in the field of microwave absorption. In this work, Ti 3 C 2 T x /Ni-Fe Prussian blue analogue (PBA) porous composites were synthesized via ion intercalation and chemical synthesis methods. The hollow cage-like Ni-Fe PBA was in-situ grown between the Ti 3 C 2 T x nanosheets. Benefiting from the magnetic loss characteristics and porous structure of Ni-Fe PBA, both the magnetic loss and polarization loss of Ti 3 C 2 T x were enhanced. The synergistic effect of multiple loss mechanisms optimized the impedance matching. Furthermore, the hollow cage-like structure of Ni-Fe PBA extended the propagation path and prolonged the transmission time of incident electromagnetic waves, thereby significantly improving the microwave absorption performance of the composite material. Consequently, the Ti 3 C 2 T x /Ni-Fe PBA composites achieve a significantly improved minimum reflection loss (RL min ) of −48.97 dB and an effective absorption bandwidth (EAB) of 3 GHz at a thickness of 3.9 mm. The radar stealth performance of the composite was evaluated by radar cross-section (RCS) simulation, with the maximum RCS reduction value reaching 11.75 dB m 2 . This work provides a promising strategy for developing high-performance microwave absorbers through structural and compositional design.
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Nano Materials Science
·
2026
·
IF 20.5
Chuanxin Yu,Ruizhu Li,Na Gao,Tiancheng Cui,Chengzhi Guan,Jinli Qiao,Jian-Qiang Wang,Guoping Xiao
The cathode material is a key determinant in the advancement of solid oxide fuel cells (SOFCs). However, achieving a balance between high electrocatalytic activity and long-term stability is still a major challenge. In this work, an in situ self-assembly strategy was developed to fabricate Pr 0.4 Sr 0.5 Ce 0.1 Fe 0.8 Ni 0.2 O 3-δ (PSCFNX) composite materials. During the calcination process, CeO 2 and NiO secondary phases spontaneously segregate and grow on the surface of the Pr 0.4 Sr 0.5 Ce 0.1 Fe 0.8 Ni 0.2 O 3-δ (PSCFN) phase. This process leads to the formation of intimate three-phase junctions and abundant bonded heterointerfaces, thereby expanding the electrochemically active area and significantly enhancing catalytic performance. The optimized PSCFNX material exhibits a low area-specific resistance of 0.081 Ω cm 2 at 800 °C. Correspondingly, the cell with an optimized cathode achieves a high peak power density of 1.576 W cm −2 at 800 °C and exhibits a long-term stability exceeding 100 h. This study confirms that the Pr 0.4 Sr 0.5 Ce 0.1 Fe 0.8 Ni 0.2 O 3-δ materials could enhance SOFC performance.
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CARBON
·
2026
·
IF 12.7
Jiabei Yu,Depeng Zhang,Xinyu Lu,Siqi Wang,Liying Wang,Yuqing Zhang,Sen Zhang,Chao Deng
Dual single-atom catalysts (DACs) provide an efficient clue to conquer the sluggish kinetics of oxygen reactions in Zn-air batteries (ZABs). However, the precise modulation on local microenvironment of DACs sites are still challenging. Herein, we report a defect-driven strategy to manipulate the microenvironment of Fe/Mn dual atomic sites that anchor on a carbon nanofiber (def-FeMn/CNF). Theoretical calculation results reveal that the defects modulate the local microenvironment of dual atom sites, which decreases the energy barrier and enhances the catalytic behaviors. Finite element analysis (FEA) modeling results demonstrate the porous carbon nanofiber is beneficial to mass transports and ensures fast kinetics. Benefitting from both aspects of advantages, the def-FeMn/CNF catalyst displays the superior pH-universal electrocatalytic properties, fast kinetics, and high stability. It exhibits the half-wave potentials of 0.92 V and 0.87 V in alkaline and acidic conditions, which outperform the FeMn-DAC/CNF, N–FeMn/CNF, Fe-SAC/CNF, and Mn-SAC/CNF reference samples. Moreover, the full Zn-air battery (ZABs) with def-FeMn/CNF cathode shows the high power densities of 295 W kg −1 and high stability over long-term (1000 h) cycling. Furthermore, the quasi-solid-state Zn-air batteries achieve a smooth operation over a wide-temperature range and a long-term (800 h) operational stability at curved state. Therefore, the defect-driven approach provides an efficient strategy to manipulate the local microenvironment of DACs for boosted catalytic properties. Moreover, it also gives a new clue to design and fabrication of pH-universal electrocatalysts towards diverse working conditions. Download: Download high-res image (485KB) Download: Download full-size image
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Yan Chen,Chao Lei,Kun Yang,Ming-Li Ye,Yong-Gang Zhao,Yun Zhang
Metal organic frameworks (MOFs) are widely employed as separable and highly efficient adsorbents in VOCs (volatile organic compounds) pollution in the air. However, due to poor stability and easy hydrolysis in water, traditional MOFs cannot yet be used for the removal of VOCs in wastewater. Here, a novel series of magnetic Fe–Cu bimetallic MOFs possessing dual hydrophilic and hydrophobic functionality was prepared for VOCs removal in wastewater. The materials were characterized using scanning electron microscopy (SEM), vibrating sample magnetometry (VSM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The results indicate that both of the morphological and adsorption performance of magnetic Fe–Cu bimetallic MOFs are highly dependent on the molar ratio of ethylenediamine to 4,4-bipyridine used during synthesis. When the molar ratios of ethylenediamine to 4,4-bipyridine are 5:1, 1:1, and 1:5, the morphologies of prepared magnetic Fe–Cu bimetallic MOFs are gravel-like, cobble-like and calcite-like, respectively. They are named as magnetic gravel-like Fe–Cu metal organic frameworks (Mag-Gra-Fe-Cu MOFs), magnetic cobble-like Fe–Cu metal organic frameworks (Mag-CoL-Fe-Cu MOFs) and calcite-like Fe–Cu metal organic frameworks (Mag-CaL-Fe-Cu MOFs). Moreover, the maximum adsorption capacity of Mag-Gra-Fe-Cu MOFs, Mag-CoL-Fe-Cu MOFs and Mag-CaL-Fe-Cu MOFs could reach up to 487.80–621.12 mg/g, 549.45–666.67 mg/g and 598.80–724.64 mg/g, respectively. Under optimal conditions, the adsorption of VOCs onto the magnetic Fe–Cu bimetallic MOFs followed the pseudo-second-order kinetic model (R² = 1) and the Langmuir isotherm model (R² > 0.999). Consequently, the magnetic Fe–Cu bimetallic MOFs developed in this work represent a viable and efficient option for removing VOCs from wastewater. Download: Download high-res image (251KB) Download: Download full-size image
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INORGANIC CHEMISTRY
·
2026
·
IF 4.6
Huanran Zheng,Yuchao Wang,Jing Zhang,Yu Bai,Yingbi Chen,Peiyao Yang,Md Raziun Bin Mamtaz,Danni Deng,Zechao Zhuang,Houzheng Ou,Meng Wang,Guozhao Fang,Haozhi Wang,Xiang Xiong,Dingsheng Wang,Chuan Zhao,Yongpeng Lei
The high desorption energy barrier for OH– hinders the improvement of the oxygen reduction reaction (ORR) and related devices. Here, an Fe-based atom pair catalyst for ORR is discovered through high-throughput density functional theory calculations. The atomic Te around the Fe1–N4 site (Te1–N2–Fe1–N2) served as an electron pump to achieve charge dilution, contributing to an onset potential of 1.03 V and a half-wave potential of 0.94 V. Moreover, a kinetics current density of 32.4 mA cm–2 and remarkable durability up to 20000 continuous electrolysis cycles (1/4 activity decay that of the Fe1–N4 site) were achieved. An ab initio molecular dynamics simulation revealed the formation process of Fe–Te dual atoms. In situ characterization and comparative experiments verify that the charge dilution toward a single Fe site around atomic Te resulted in promoted O2 conversion and accelerated *OH desorption. The corresponding Al-air batteries showed an open-circuit potential of 1.62 V, a power density of 138.1 mW cm–2, and stable voltages during the long-term discharging process (446 h at 10 mA cm–2 and 270 h at 20 mA cm–2). The study demonstrates the single-atom electron pump as an effective strategy for handling the charge density around single-atom sites for electrocatalysis.
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高影响因子
Journal of Materials Chemistry A
·
2026
·
IF 9.2
Xiaoyi Fu,Xia Lei,Yanyi Wang,Shuyu Cui,Junjie Hu,Tian Lang,Xiaolong Zhou,Sarayut Tunmee,Suttipong Wannapaiboon,Xingzhu Wang,Xiongwei Zhong,Baomin Xu
Developing efficient and durable electrocatalysts for the oxygen evolution reaction (OER) is crucial to advancing rechargeable zinc–air batteries (ZABs). In this work, we rationally design a series of Fe-doped double perovskite oxides (BaPrCo2−xFexO5+δ, denoted BPCF-x) to elucidate the interplay among Fe incorporation, lattice oxygen activity, and OER performance. Comprehensive structural and spectroscopic analysis reveal that Fe doping effectively tailors the electronic configuration and modulates the oxygen vacancy concentration, thereby accelerating charge transfer kinetics. Notably, BPCF-0.8 exhibits the lowest overpotential of 295 mV at 10 mA cm−2 and a Tafel slope of 45 mV dec−1, outperforming the pristine BPC catalyst. Optimized Fe incorporation promotes the lattice oxygen mechanism pathway while preserving structural integrity, as confirmed by OER tests in various pH electrolytes. Furthermore, the ZAB using BPCF-0.8 as the air cathode catalyst delivers high power density and excellent long-term durability, sustaining stable operation for over 500 h. This work elucidates how Fe doping activates lattice oxygen and balances oxygen vacancies, providing valuable insights into cation substitution engineering and lattice oxygen regulation in perovskite electrocatalysts.
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Nano-Micro Letters
·
2026
·Vol. 18
·期 1
·291
·
IF 38.5
Shi Yuan,Zhang Ziyi,Bai Lei,Li Dingding,Shi Jingbo,Yue Zongye,Yuan Tianyu,Bai Jinbo,Bai Jintao,Leng Kunyue,Li Xiaolin,Wang Xuejing,Qu Yunteng
Metal–nitrogen–carbon catalysts have emerged as promising alternatives to costly platinum group catalysts in fuel cells and metal–air batteries; however, further enhancement of their activity in both alkaline and acidic media is still required. Here, we present a FeMg–N–C dual-atom catalyst that demonstrates excellent oxygen reduction reaction (ORR) performance, achieving notably high half-wave potentials (E 1/2 ) of 1.004 V in alkaline media and 0.881 V in acidic media. Additionally, the FeMg–N–C catalyst delivers peak power densities of 530.1 mW cm −2 in Zn–air cells and 1.06 W cm −2 in H 2 –O 2 fuel cells. Experimental and theoretical analyses reveal that the enhanced ORR activity arises from the spin state transition of Fe sites from low spin to medium spin, induced by adjacent Mg sites. This medium-spin Fe site exhibits strong adsorption of *O 2 and weak adsorption of *OH, effectively facilitating the initial ORR step and the removal of *OH. This work paves a novel pathway to design and construct well-performing electrocatalysts via the spin regulation strategy.
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Journal of Environmental Chemical Engineering
·
2026
·
IF 7.5
Jin-Xing Zheng,Min-Hua Cui,Yan Zhang,Jing Wu,He Liu,Zhi-Yong Zheng
Nitrophenols are toxic and recalcitrant organic pollutants, posing a major challenge for wastewater treatment. Herein, a Fe-doped cyanobacterial biochar catalyst (Fe 3 /C 1 -800) was fabricated via a one-step impregnation pyrolysis strategy using lake-harvested cyanobacterial biomass as the carbon matrix and FeCl 3 ∙6H 2 O as both the in-situ activator and Fe source realizing the 'waste-to-treat-waste' concept. When applied to the catalytic reduction of 4-nitrophenol (4-NP), the Fe 3 /C 1 -800/NaBH 4 system achieved nearly complete reduction of 4-NP within 5 min, with a high turnover frequency (TOF) of 0.67 mmol·g -1 ·min -1 , surpassing most reported transition-metal catalysts and approaching noble-metal activity. The catalyst exhibited high efficiency over a wide pH range (3-11) and temperature range (15-45 ℃), resisted interference from Cl - and NO 3 - , and retain 93.7% of its activity after four consecutive cycles. In real water matrices (Lake Taihu water and secondary effluent from a sewage treatment plant), the 4-NP removal efficiency reached 95.4% and 88.1%, respectively. Mechanistic investigations revealed a synergistic effect between the catalyst’s large specific surface area (802.16 m 2 ·g -1 ) for 4-NP adsorption and the Fe 2+ /Fe 3+ redox cycle for accelerated electron transfer. This synergy promotes BH₄⁻ dissociation to generate active hydrogen species, enabling the selective reduction of 4-NP to 4-aminophenol (4-AP) with 97% selectivity. Furthermore, Fe 3 /C 1 -800 displayed broad-spectrum catalytic activity toward diverse nitrophenol contaminants (e.g., o -nitrophenol, p -nitrotoluene) with conversion rates >90%. This work not only offers a low-cost, eco-friendly pathway for cyanobacterial valorization but also offers a novel design principle of high-performance biochar-based catalysts, advancing the development of sustainable reduction systems for refractory organic wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Zhen Xu,Qi Xiang,Junchi Zhao,Xuede Qi,Hu Yuan,Dongdong Li,Jingwen Liu,Xiaoyi Huang,Qian Xue,Andreu Cabot,Xueqiang Qi
Fe-doping and oxygen vacancies synergistically optimize NiCo 2-x Fe x O 4-y for alkaline OER. • Oxygen vacancies facilitate OH − adsorption to accelerate the AEM pathway. • Fe species modulate oxygen covalency to trigger the LOM pathway. • Oxygen vacancies act as oxygen reservoirs to regenerate lattice oxygen. • Dynamic regeneration prevents structural collapse, harmonizing AEM and LOM. Developing oxygen evolution electrocatalysts that combine high activity, long-term durability, and low cost remains a central challenge because these properties are often constrained by competing reaction pathways. The adsorbate evolution mechanism (AEM) is limited by linear scaling relationships, whereas the lattice oxygen mechanism (LOM) offers higher activity but typically suffers from structural degradation due to lattice oxygen loss. Here, we demonstrate that Fe doping in NiCo 2 O 4 creates a synergistic interplay between Fe active sites and oxygen vacancies, enabling both enhanced activity and durability. Experimental and theoretical analyses reveal a dual-mechanism pathway: oxygen vacancies facilitate OH − adsorption to accelerate the AEM, while Fe species regulate O covalency to activate the LOM. Consequently, the optimized NiCo 1.4 Fe 0.6 O 4-y catalyst achieves an ultralow overpotential of 196 mV at 10 mA cm −2 . Furthermore, oxygen vacancies are proposed to facilitate lattice‑oxygen replenishment during LOM operation, thereby helping to mitigate structural degradation. This dynamic regeneration mechanism underpins the excellent long-term stability of more than 290 h. Overall, this work offers a practical strategy to break the activity–stability trade-off in oxygen evolution catalysis through oxygen-vacancy engineering of dual-mechanism pathways. Defect engineering synergistically unlocks coupled AEM and LOM pathways, with abundant oxygen vacancies accelerating intermediate adsorption and dynamically regenerating lattice oxygen, effectively breaking the intrinsic trade-off between catalyst activity and durability during alkaline water splitting. Download: Download high-res image (199KB) Download: Download full-size image
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