APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
·
IF 21.1
Ziwen An,Qihao Xie,Shaohan Xu,Baoling Niu,Lingzhi Sun,Jingui Zheng,Guohua Zhao
Perfluorooctanoic acid (PFOA), a synthetic persistent and bio-accumulative chemical, has raised global concerns. PFOA oxidation by advanced oxidation technology (AOPs) begins with decarboxylation, followed by CF 2 groups unzipping cycle and C–F cleavage. Since reactive radicals (even •OH) cannot initiate decarboxylation and abundant low-toxicity organics hinders decarboxylation, presents significant challenges for defluorination. We designed a functionalized high-index (201) TiO 2 photoanode (S-TiO 2,201 ) capable of molecular recognition and activation, which switches PFOA adsorption from carboxyl groups to preferential adsorption via the perfluoroalkyl backbone. This adsorption configuration selectively recognizes PFOA and accelerates decarboxylation via direct hole oxidation. In situ electron paramagnetic resonance (EPR) confirmed faster decarboxylation and •OH quantification showed hole utilization efficiency rising from 9.6 % to 39.3 % after functionalization. PFOA was selectively removed from 200 μg/L to 1.2 μg/L with 1000-fold humic acid interference. This work presents a strategy for efficient and selective PFOA removal by precisely modulating its adsorption configuration.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
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IF 8.3
Rui Liu,Yunpei Cui,Na Chai,Lei Yang,Xiufeng Zhang,Qianqian Nie,Hesheng Yu
This study developed an amorphous MoO 2 –C hollow spherical cocatalyst (MOC) derived from Mo-polydopamine, and hybridized it with ZnIn 2 S 4 to form ZnIn 2 S 4 /MoO 2 –C (ZMC) composites. Various characterizations were conducted to analyze the crystal structure, morphology, and photoelectrical properties of the ZMC composites. The prepared ZMC composites were evaluated for photocatalytic hydrogen evolution under simulated sunlight. Furthermore, nanorod-like MoO 2 –C cocatalyst (A-MOC) and ZnIn 2 S 4 /A-MOC (A-ZMC) composites were prepared to investigate the impact of carbon source on catalytic activity. Results show that the addition of MOC cocatalyst significantly enhances the hydrogen evolution rate of ZnIn 2 S 4 from 0.54 to 20.61 mmol g −1 h −1 , and increases the apparent quantum efficiency at 420 nm from 1.66 % to 8.63 %. The hydrogen evolution rate of the optimal ZMC is 1.26 times that of the optimal A-ZMC (16.28 mmol g −1 h −1 ). The crystal structure and morphology of MoO 2 –C determined by carbon source affect the photocatalytic hydrogen evolution performance of ZnIn 2 S 4 . Insight mechanism analysis indicates that the formation of a Schottky junction facilitates the separation of photogenerated electron-hole pairs, thereby enhancing the photocatalytic hydrogen evolution activity. Finally, the ZMC composite catalyst retains 89 % of its original hydrogen evolution performance after 5 cycles over 15 h, demonstrating good stability and promising prospects for real-world applications.
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Energy Storage Materials
·
2024
·
IF 18.9
Kai Sun,Xueyan Li,Zhuojun Zhang,Kang Fu,Xu Xiao,Lili Gong,Peng Tan
The durability of lithium-ion batteries (LiBs) is a crucial factor for advancing market applications. Although remarkable progress is achieved in cycling stability at ambient temperatures, the rapid capacity decay at low temperatures (LT) limits their utilization in extreme conditions. This study reveals that LiBs with silicon/graphite (Si/C) anodes exhibit superior LT performance compared to conventional graphite-based anodes. The electrochemical analysis demonstrates that Si improves the LT kinetic performance. In addition, the higher potential plateau of Si thermodynamically prevents the anode from easily reaching the lithium (Li) plating potential. The pronounced expansion of Si and the corresponding thicker solid electrolyte interphase (SEI) at the LT are demonstrated by various characterization techniques, especially the X-ray photoelectron spectroscopy depth profiling analyses. Li plating is confirmed as the main degradation factor at LT rather than Si swelling. Instead, the addition of Si effectively inhibits anode Li plating, contributing to outstanding LT cycling stability. Furthermore, guidance on the Si/C hybrid strategy is provided through simulations. This study provides a valuable strategy for improving LiB performance at LTs, and promotes the application in extreme conditions, such as in space and the deep sea.
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ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 49
·2106082
·
IF 18.808
Xinglin Tao,Shuyao Li,Yuxiang Shi,Xingling Wang,Jingwen Tian,Zhaoqi Liu,Peng Yang,Xiangyu Chen,Zhong Lin Wang
Due to the thermionic emission effect, the electron transferred to dielectric surface can be released into vacuum after the contact electrification (CE). Therefore, triboelectric nanogenerator (TENG) cannot maintain effective electrical output under high temperature conditions. In order to obtain high thermal charge stability, polyimide is modified with strong electron withdrawing groups like trifluoromethyl ( CF 3 ) and sulfone group ( SO 2 ) in backbone. The fluorinated polyimides (F-PI) with a big band gap can provide a tribocharge density of 170 µC m −2 (4 times of common Kapton film) and become more negative than polytetrafluoroethylene in triboelectric series. In addition, BaTiO 3 nanoparticles are doped in F-PI film for inducing deep traps and interfacial polarizations for CE, which can further enhance the charge density (200 µC m −2 ) and thermal charge stability. Finally, a flutter-driven TENG (FD-TENG) is designed based on this BaTiO 3 -doped F-PI film to harvest wind energy and sense wind velocity. This FD-TENG can maintain 32% of its output performance at 200 °C in comparison with room temperature, which is the highest thermal charge stability reported for triboelectric polymers. Therefore, this BaTiO 3 -doped F-PI has great application prospects for energy generation and motion detection in hot wind tunnel and many other harsh environments.
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ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Mingqiang Chen,Zhiwei Yang,Haosheng Xin,Yishuang Wang,Defang Liang,Chang Li
As a major constituent of renewable biomass, conversion of cellulose to high-value chemicals presents a promising strategy. Herein, we designed a multifunctional Ni@C/WOx catalyst for direct cellulose conversion to ethylene glycol. This catalyst exhibited excellent stability while achieving a high ethylene glycol yield (69.4%). Graphene-encapsulated metal Ni stabilized hydrogenation activity and minimized metal leaching. The interaction between Ni@C and WOx facilitated the reduction of WOx and increased the formation of W5+ species. Characterization by electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS), NH3-TPD, and Py-IR confirmed that W5+ formation induces oxygen vacancies and acid sites on the catalyst support surface. At 30% Ni loading, strong metal–support interactions maximized the W5+ concentration and oxygen vacancy, enhancing the C–C bond cleavage efficiency. Consequently, the synergistic effect between Ni@C and WOx effectively facilitates key steps in cellulose conversion to ethylene glycol: cellulose hydrolysis, glucose retro-aldol condensation, and glycolaldehyde hydrogenation. The understanding of these structure–performance relationships has provided new ideas for the green and sustainable production of high-value-added chemicals from cellulose.
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Journal of Energy Storage
·
2025
·
IF 9.8
Sikai Zhang,Rui Yin,Zhilong Tan,Minghai Zhao,Peng Zhou,Pei He,Runjing Zhang,Ziyan Wang,ZhiFeng Huang,Hai Hu,Li Liu
The mixed phosphate Na₄Fe₃(PO₄)₂(P₂O₇) (NFPP) via synergistic coordination of mixed [PO₄]/[P₂O₇] anion groups achieves a flat voltage plateau at 3.2 V (vs. Na + /Na) and a theoretical specific capacity of 129 mAh g −1 , but its practical application is still limited by its inherent low electronic conductivity. Through structural integration of polyanion-type cathode materials, this study innovatively designed and constructed hierarchical Na₄Fe₃(PO₄)₂(P₂O₇)@C mesoporous microspheres (NFPP@CMMS). The NFPP nanocrystals uniformly embedded in a three-dimensional interconnected meso porous carbon matrix (pore size distribution: 2–5 nm). Such hierarchical meso/micro-nano architectures provided expansive ion-exchange interfaces, accelerating Na + de/intercalation kinetics while enhancing electronic conductivity and mitigating structural collapse during cycling. Consequently, the NFPP@CMMS delivers exceptional reversible discharge capacity (121 mAh g −1 at 0.1C), outstanding rate capability (72 mAh g −1 at 50C), and superior cycling stability (90.70 % capacity retention after 3500 cycles at 5C). This triple-synergy strategy—combining nano-confinement effects, interconnected mesoporous channels, and carbon-encapsulated network—provides a novel pathway for developing practical sodium-ion battery cathodes.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Tianzhan Shen,Cuiyan Li,Haibo Ouyang,Mengyao He,Sirui Wu,Li Wang,Qianqian Chen,Yulei Zhang,Jian Wei
To enhance ablation resistance in (Ta₀.₂Nb₀.₂Ti₀.₂Hf₀.₂Zr₀.₂)C–SiC (HEC–SiC) ceramics, the influence of SiC particle size on microstructure and ablation behavior was examined. With the addition of 20 wt% fine SiC particles, its relative density increases from 91.23% to 97.79%, and the grain size of the HEC phase decreased from 3.58 to 0.79 μm. The fine SiC particles facilitated the formation of a continuous SiC network, thereby enhancing the thermal conductivity from 6.94 to 22.35 W/mK. This enhanced thermal conductivity contributed to reducing the ablation temperature from 2358 to 1721 °C during the ablation. The HEC-SiC sample with 0.5 μm fine SiC particles added exhibits a mass and linear ablation rate of 0.05 mg/s and 0.67 µm/s. The superior ablation resistance can be attributed to the reduced ablation temperature, altering the preferential oxidation sequence. This change in preferential oxidation led to the formation of a compact oxide scale with a multi-layer structure.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·Vol. 108
·期 12
·e70209
·
IF 3.8
Zirui Du,Chaokun Song,Kang Guan,Pinggen Rao,Xiaohui Yang,Longteng Bai,Shengbo Shi,Jing Wang,Yongsheng Liu,Qingfeng Zeng
Improving the ablation resistance of carbon fiber-reinforced silicon carbide (C/SiC) composites is essential to meet the stringent demands of ultra-high-temperature applications, but traditional empirical design approaches are resource-intensive and time-consuming. This study presents a novel data-driven methodology integrating machine learning (ML) with experimental validation to optimize C/SiC composite ablation resistance. Through systematic data preprocessing and feature analysis of 102 experimental samples, an XGBoost regression model was developed, achieving satisfactory prediction accuracy (mean absolute error < ∼0.075, mean squared error < ∼0.015, and coefficient of determination [R 2 ] > ∼0.75) for ablation rate. SHapley Additive exPlanations (SHAP) analysis revealed that modifier properties, particularly standard enthalpy and melting point, predominantly influence ablation resistance. The ML-guided design strategy, implemented through Bayesian optimization, led to the successful fabrication of ZrB 2 -modified C/SiC composites with exceptional ablation resistance. The optimized composite, containing approximately 20.0 vol.% ZrB 2 , achieved a linear ablation rate of 2.083 µm/s under oxyacetylene torch testing, representing a significant improvement over conventional compositions. Microstructural analysis confirmed the formation of a dense SiO 2 ‒B 2 O 3 protective layer, validating the predicted mechanism of enhanced ablation resistance. This work establishes a robust framework for accelerated development of ultra-high-temperature ceramics and demonstrates the efficacy of ML-driven approaches in materials design optimization. An object-oriented software with interactive graphical user interface has been developed. These methodologies have been integrated into an interactive software, Modified C/SiC Ablation Rate intelligent design Software (MARS), creating an efficient tool for the accelerated design of C/SiC composites with tailored ablation performance.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Lei Li,Wei Chu,Cheng Ding,Xinguo Xi,Ruiyu Jiang,Jinlong Yan
s Mo-based nanoparticles (MoO 2 and Mo 2 C) embedded in porous carbon matrix have been synthesized by a successive hydrothermal and thermal treatment strategy. The synthesized materials were tested for CO x -free H 2 production via ammonia decomposition . Various characterizations, including N 2 -sorption, TGA , FTIR, TEM, XRD , EDX and XPS, were employed to investigate the morphology, component and structure of fresh and used catalysts. In terms of fresh Mo@C sample, tiny Mo-based nanoparticles (3–6 nm) are homogeneously dispersed in porous carbon matrixes, which were rapidly nitridized to MoN phases during reaction process. Most of MoN species were still embedded in carbon matrixes after 25 h stability test. For comparison, MoN@C sample was achieved via temperature-programmed ammonolysis of Mo@C sample, demonstrating the formation of MoN species and enhanced activities. The ammonia decomposition activity (∼90% conversion) is obtained over MoN@C catalyst at 600 °C and 15,000 h −1 , which is higher than that of non-pretreated Mo@C catalyst. This embedded structure also endows them with a relatively stable performance even at high temperature.
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Materials
·
2019
·Vol. 12
·期 20
·3364
·
IF 2.972
Kefeng Pan,Yingying Zhai,Jiawei Zhang,Kai Yu
Electrolytic water splitting with evolution of both hydrogen (HER) and oxygen (OER) is an attractive way to produce clean energy hydrogen. It is critical to explore effective, but low-cost electrocatalysts for the evolution of oxygen (OER) owing to its sluggish kinetics for practical applications. Fe-based catalysts have advantages over Ni- and Co-based materials because of low costs, abundance of raw materials, and environmental issues. However, their inefficiency as OER catalysts has caused them to receive little attention. Herein, the FeS2/C catalyst with porous nanostructure was synthesized with rational design via thein situelectrochemical activation method, which serves as a good catalytic reaction in the OER process. The FeS2/C catalyst delivers overpotential values of only 291 mV and 338 mV current densities of 10 mA/cm2and 50 mA/cm2, respectively, after electrochemical activation, and exhibits staying power for 15 h.
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POLYMER SCIENCE SERIES B
·
2014
·Vol. 56
·期 6
·799-806
·
IF 0.633
Xu Yewei,Sun Yi,Huo Jichuan,Lei Yonglin,Zhang Lin
A new bis(benzimidazolyl) monomer containing biphenyl group, 4,4′-bis(2-benzimidazolyl) diphenyl, was successfully synthesized from 4,4′-biphenyldicarboxylic acid and 1,2-phenylenddiamine. The corresponding biphenyl-containing poly( N -arylenebenzimidazole)s were prepared using C-N coupling reaction that removed the N-H sites from the novel bis(benzimidazolyl) derivative with activated aromatic difluorides in sulfolane. The reaction was carried out at 210°C in the presence of anhydrous potassium carbonate. All resulting polymers showed essentially amorphous patterns. This was consistent with the calculated results. Differential scanning calorimetry and thermogravimetric measurements showed that the polymers had high glass transition temperatures (>253°C) and good thermal stability with high decomposition temperatures (>457°C). These novel polymers also showed easy solubility.
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Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Shutong Fan,Chengji Deng,Chao Yu,Zhenglong Liu,Jun Ding
To solve the problem of deterioration of oxidation resistance and thermal shock resistance caused by low carbonization of MgO–C refractories, nano-laminated BN modified graphite was prepared by the molten salt method to reinforce unfired MgO–C refractories. The findings revealed that the introduction of nano-laminated BN modified graphite significantly improved the mechanical properties. Moreover, the oxidation index of MgO–C refractories with 4 wt% nano-laminated BN modified graphite was 34% lower than that of the unadded sample, and the residual strength after thermal shock was significantly increased by 224%. Furthermore, incorporating nano-laminated BN modified graphite facilitated the formation of columnar Mg 2 SiO 4 , octagonal columnar MgAl 2 O 4 , and MgO–Mg 2 SiO 4 –MgAl 2 O 4 –Mg 3 B 2 O 6 dense layers, thereby contribute to overall performance improvements.
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危险品化学品经营许可证（带存储）