CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Lingzhi Guo,Hongyan He,Yurong Ren,Chao Wang,Mingqi Li
Core-shell F-doped carbon coated SiO composites with interspaces and some small voids (SiO@F-doped C) are successfully fabricated using bulk SiO as starting material. With the assistance of polytetrafluoroethylene (PTFE), both etching and carbon coating of SiO are firstly performed in a single step, which largely lowers the production cost of materials. The SiO@F-doped C composite obtained by annealing the mixture of SiO and PTFE with a mass ratio of 5:3 at 650 °C shows the highest stable discharge capacity with excellent cycling stability. It delivers a stable discharge capacity of about 975 mAh g −1 at a current density of 100 mA g −1 . Even after the current density increases to 1600 mA g −1 , a stable discharge capacity of about 553 mAh g −1 can be achieved. At a current density of 400 mA g −1 , the composite maintains a discharge capacity of 752 mAh g −1 after 350 cycles, the retention of which is 99.2% versus that in the second cycle. Compared with the annealed SiO, in addition to higher conductivity, the ions diffusion rate of the SiO@F-doped C composite increases 2.94 times while the volume expansion falls by more than half, which should be responsible for its significantly enhanced electrochemical performance.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2026
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IF 3.1
Siyu Wu,Peng Xu,Lei Pu,Shuya Wu,Delong Xu,Shengbin Zeng,Jingwei Liu
Conventional polymer gels may suffer from thermal degradation and salt-induced changes under severe downhole conditions. In this study, an AM/SA/AMPS/NVP crosslinked copolymer gel was synthesized by aqueous free-radical polymerization using MBA as the crosslinker. The formulation was optimized through a sequential single-factor approach, and the resulting gel was characterized in terms of network morphology, thermal stability, swelling behavior, compressive mechanical properties, salt resistance, and plugging performance. The gel retained 89.4% of its volume after aging at 140°C for 48 h and showed a uniaxial compressive strength of 0.203 MPa, with nearly 100% recovery after 10 loading–unloading cycles at 50% strain. The pure gel sealed fractures with widths of 1–3 mm, while the addition of 10 wt% 20–40 mesh quartz sand increased the breakthrough pressure to 2.05 MPa for a 3 mm fracture. In 20–40 mesh sand beds at 140°C, the total fluid loss after 30 min was 26.8 mL. These results indicate that the crosslinked copolymer gel provides favorable thermal, mechanical, and plugging performance, while quartz sand bridging improves the pressure-bearing capacity of the sealing structure in wide fractures.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2026
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IF 6.7
Dexin Kong,Rui Shan,Shuxiao Wang,Huan Li,Haoran Yuan,Yong Chen
Converting plastic waste into hydrogen provides a promising route to simultaneously address environmental pollution and clean energy production. This study developed a Ni single-atom catalyst stabilized on an Al 2 O 3 /N-C composite support (Ni@Al 2 O 3 /N-C) for H 2 production from polypropylene (PP) via pyrolysis-catalytic reforming. The composite support integrates the high-temperature structural stability of Al 2 O 3 with the strong anchoring capability of N-doped carbon, enabling the formation of stable C-N-Ni active sites and effectively suppressing Ni aggregation under harsh reforming conditions. Under the optimal conditions (catalyst/PP = 1.25:1, water feed = 6 mL h −1 ), the catalyst achieved a gas yield of 127.59 mmol g −1 PP, a hydrogen yield of 84.14 mmol g −1 PP, and a hydrogen selectivity of 65.96%. The catalyst maintained good cyclic performance over 10 consecutive runs, with the H 2 yield decreasing from 84.14 to 69.39 mmol g −1 PP while the H 2 selectivity remained at 64.49% in the 10th cycle. XPS, HAADF-STEM, XRD, Raman, SEM, and TEM analyses confirmed that Ni remained atomically dispersed on the support after reaction, with no obvious nanoparticle agglomeration and only limited carbon nanotube formation. This work provides an effective support-engineering strategy for designing thermally stable single-atom catalysts for plastic reforming and other high-temperature catalytic processes.
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高影响因子
RARE METALS
·
2026
·Vol. 45
·期 5
·e70350
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IF 12.1
Lijuan Wang,Jie Hou,Wubo Wan,Yongjie Mo,Zhijian Liao,Shengkui Zhong,Linhua Zhu
en This link goes to a English section zh This link goes to a Chinese section Atomically dispersed iron–nitrogen–carbon (Fe-N-C) catalysts have emerged as promising alternatives for oxygen reduction reaction (ORR) owing to their highly atomic utilization. However, maintaining both Fe atomic dispersion and dense Fe-N x sites (typically below 2 wt%) in Fe-N-C catalysts is still a key challenge. In this investigation, a template (1,2-dicyanobenzene; DCB) assisted strategy has been reported to achieve hierarchically porous Fe-N/C DCB0.2 -900°C catalysts, which have atomically dispersed Fe-N 4 C active sites with a 5.45 wt% Fe loading and served for robust ORR. 1,2-dicyanobenzene containing abundant nitrogen source not only efficiently enhances the coordinated environment for dense Fe sites, but also facilitates the formation of a hierarchical porous structure in Fe-N/C DCB0.2 -900°C catalyst. Computational analysis demonstrated that template-assisted structural modification effectively reduces the energy barrier associated with *OOH intermediate formation while simultaneously adjusting the d-band center position of Fe-N 4 C coordination sites within the Fe-N/C DCB0.2 -900°C system. This optimization enhances the stabilization of oxygen-bearing intermediates and promotes accelerated kinetics of the ORR. Consequently, the Fe-N/C DCB0.2 -900°C exhibited a half-potential of 0.9 V versus RHE when evaluated in 0.1 M KOH electrolyte and achieved a peak power density of 220 mW cm −2 in a zinc–air battery, surpassing commercial Pt/C (0.88 V vs. RHE, 194 mW cm −2 ). Such methodology provides a new avenue for constructing dense metal active sites for achieving functional, but not limited to, ORR, catalysts and applications. 摘要 en This link goes to a English section zh This link goes to a Chinese section 原子分散的铁-氮-碳(Fe-N-C)催化剂因其高原子利用率,已成为很有前景的氧还原反应(ORR)替代催化剂。然而,在Fe-N-C催化剂中同时保持铁的原子分散性和密集的Fe-N x 位点(通常低于2 wt%)仍是一个关键挑战。在本研究中,我们报道了一种模板(1,2-邻苯二甲腈; DCB)辅助策略,以制备具有分级多孔结构的Fe-N/C DCB0.2 -900°C催化剂,该催化剂具有原子分散的Fe-N 4 C活性位点,铁负载量为5.45 wt%,可用于高效的ORR。含有丰富氮源的1,2 -邻苯二甲腈不仅能有效改善密集铁位点的配位环境,还有助于在Fe-N/C DCB0.2 -900°C催化剂中形成分级多孔结构。理论计算分析表明,模板辅助的结构修饰有效降低了与*OOH中间体形成相关的能垒,同时调整了Fe-N/C DCB0.2 -900°C体系中Fe-N 4 C位点的d带中心位置。这种优化增强了含氧化合物中间体的稳定性,并促进了ORR的动力学反应速度。因此,在0.1 M KOH电解质中测试时,Fe-N/C DCB0.2 -900°C的半波电位为0.9 V,在锌空气电池中实现了220 mW cm −2 的峰值功率密度,超过了商用Pt/C(0.88 V,194 mW cm −2 )。这种方法为构建密集的金属活性位点提供了新途径,可用于制备功能性催化剂(不仅限于ORR)及相关应用。
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2026
·
IF 4.5
Yongtai Li,Yuanting Du,Yushan Jia,Ruixi Yang,Weijun Shan,Zhenning Lou,Haibiao Yu,Ying Xiong
Hollow coral-like MCM-41-C was successfully prepared by adjust ethanol dosage. • Hollow coral-like 7wt%Al-MCM-41-C with rich weak acid site was prepared by impregnation. • Butene yield was 92.26% for 7wt%Al-MCM-41-C catalyst (300 °C, 90 min). • Due to hollow coral-like structure, 7wt%Al-MCM-41-C exhibits high catalytic stability. In this paper, the hollow coral-like ordered mesoporous MCM-41-C zeolites were synthesized by hydrothermal method, and their synthesis conditions were thoroughly investigated. Then, x wt%Al-MCM-41-C catalysts feature with hollow coral-like morphology were prepared by impregnation method, and used for the catalytic conversion of γ-valerolactone (GVL) to butene. The results showed that the introduction of Al species not only did not destroy the original special microscopic morphological structure of the MCM-41-C, but also co-existed on the surface and skeleton of the catalyst, resulting in a large number of weak acid sites. The optimal 7wt%Al-MCM-41-C catalyst has a specific surface area of 708.56 m 2 g −1 . The content of weak acid was 0.7262 mmol g −1 . At 300 °C, the GVL conversion and butene yield over the catalyst can reach 99.10% and 92.26%, respectively, within just 90 min of reaction. Meanwhile, the 7 wt%Al-MCM-41-C catalysts also demonstrated excellent catalytic cycle stability, and the butene yield remained above 90% after the 4th cycle. Download: Download high-res image (330KB) Download: Download full-size image
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JOURNAL OF ALLOYS AND COMPOUNDS
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2026
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IF 6.7
Mengzhe Jin,Houqin Wang,Shasha Xu,Zihan Liu,Yunnuo Niu,Ziming Feng,Weidong Liu,Gang Yu,Qingyuan Fang,Qingmin Wang,Rongfeng Huang,Yang Liu
The increasing complexity of electromagnetic environments demands lightweight, broadband, and angle-insensitive electromagnetic wave absorbers. However, achieving a synergistic balance between impedance matching and attenuation capability remains a critical challenge. Herein, we propose a mechanism-oriented design strategy for a lightweight porous metamaterial absorber based on Co₃Fe₇/C nanofibers. By combining dielectric-magnetic material optimization with porous structural engineering, impedance matching and energy dissipation are simultaneously regulated. Simulations show that thickness, pore radius, and porosity critically determine electromagnetic responses. The optimized absorber achieves an effective absorption bandwidth of 6.1 GHz (8.2–14.3 GHz) and a minimum reflection loss of −56.86 dB at 2.5 mm thickness, with robust angle-insensitive performance up to 60°. Mechanistic analysis attributes the superior performance to synergistic coupling of multiple scattering, interfacial polarization, conduction loss, magnetic resonance, and optimized impedance matching. This work provides a universal framework integrating material design with structural engineering for next-generation lightweight electromagnetic wave absorbers.
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高影响因子
COMPOSITES COMMUNICATIONS
·
2026
·
IF 8.6
Lulu Diao,Zhaobo Tian,Shaobo Zhang,Zhaorui Li,Jian Zhao,Zhanglin Chen,Jie Zhang,Lu Liu,Xiang Li
Engineering hierarchical mesopores in SiC/C microspheres via selective oxidative etching for tuned pore architecture. • Achieving near-electrical-insulation (2 wt% carbon) without sacrificing Ku-band absorption performance. • Realizing an exceptional RL min of −37.21 dB and ultrabroad EAB of 4.55 GHz at merely 2.4 mm thickness. • Demonstrating that mesopore architecture reconciles the impedance matching-attenuation trade-off in lightweight absorbers. Ku-band (12-18 GHz) satellite communications and high-resolution radar demand electromagnetic wave (EMW) absorbing materials that integrate strong absorption, broad bandwidth, light weight, and electrical insulation. Carbon and silicon carbide (SiC) are attractive candidates due to their low density and complementary loss mechanisms—conduction loss and dielectric loss, respectively. However, conductive carbon absorbers suffer from poor impedance mismatch, whereas insulating SiC lacks sufficient dielectric loss. Simply mixing the two phases does not fundamentally resolve this trade-off. Herein, we advance beyond composition tuning by engineering a porous architecture. SiC/C microspheres were fabricated via carbothermal reduction followed by selective oxidation etching, using porous carbon spheres as templates. This post-treatment reduced the carbon content from ∼40 wt% to ∼2 wt% and simultaneously transformed the microporous architecture into a highly interconnected mesoporous network (81.18% mesopore ratio). The resulting material exhibits near-insulating behavior while delivering exceptional Ku-band absorption: a minimum reflection loss of −37.21 dB and an effective absorption bandwidth of 4.55 GHz (covering 11.05–15.6 GHz, most of the Ku-band) at a thickness of 2.4 mm. This work demonstrates that mesopore engineering effectively reconciles the attenuation-impedance matching trade-off, offering a novel path toward lightweight, insulating, and high-performance EMW absorbers for Ku-band applications.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2026
·
IF 12.2
Junya Zhang,Tiedong Lu,Yunwei Cui,Qihe Tang,Yuansong Wei,Hans Hermann Richnow
Methanogenesis is a critical driver of global carbon cycling and bioenergy recovery, yet how bacteriophages modulate methane production remains poorly understood. Here, we integrated high-throughput chromosome conformation capture (Hi-C) with multi-omics to map in situ phage–host interactions through an over 440 day anaerobic digestion experiment. We captured 6100 active physical linkages, revealing that 16.3 ± 2.1% of interactions involved auxiliary metabolic genes (AMGs). Notably, we observed a dynamic community-level compositional shift in viral life strategies driven by operational stress. Under mesophilic conditions, lysogenic piggyback-the-winner dynamics prevailed, with AMGs enhancing host competitiveness. Conversely, thermophilic conditions with high total solids stress triggered lytic kill-the-winner strategies. During this phase, AMGs supported rapid phage replication targeting overproliferating bacteria to restore the disrupted balance between acidogenesis and methanogenesis. Furthermore, we identified 529 DNA viral operational taxonomic units (vOTUs) directly infecting methanogens, alongside broad-host-range phages spanning bacterial and archaeal domains. Importantly, we detected four RNA vOTUs exclusively under thermophilic conditions, providing the first omics-based evidence of RNA phages actively infecting methanogenic archaea. These findings highlight phages as important modulators of methane production, offering a foundational framework for developing targeted phage-engineering strategies to optimize bioenergy systems and mitigate methane emissions.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2026
·
IF 4.4
Li Xiaoguang,Chen Jia,Li Aoqi,Li Jing,Wang Mingyu,Li Liangsheng,Shangguan Enbo
A novel in situ self-sulfidation approach was devised to fabricate ZnO/ZnS/C ternary nanocomposites as highly stable anodes for alkaline Zn–Ni batteries. Zinc sulfate acted as a dual-purpose precursor, providing both zinc and sulfur, whereas acrylamide served as the carbon source and in situ reductant. In a single-step carbothermal pyrolysis at 800 °C, the carbon matrix converted sulfate ions to sulfide, facilitating the simultaneous generation of electrochemically active ZnO, a protective ZnS layer, and a conductive carbon network during a single thermal treatment. The optimized ZnO/ZnS/C-2 electrode exhibited a discharge capacity of 576.8 mAh g −1 after 600 cycles at 1 C and maintained 513.2 mAh g −1 at 15 C. Under identical conditions at 10C, the ZnO/ZnS/C-2 electrode delivered a capacity of 545.3 mAh g −1 , which is 41.5% higher than that of commercial ZnO (385.4 mAh g −1 ). Upon the current density reverting to 0.2 C, it regained 96.6% of its original capacity, indicating remarkable reversibility. Post-cycling scanning electron microscopy images validated the successful inhibition of zinc dendrite proliferation. The performance improvements arise from the synergistic combination of the protective ZnS layer, the interconnected conductive carbon framework, and the advantageous ZnO/ZnS heterointerface, which collectively boost structural stability and charge transfer kinetics.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2026
·
IF 7.6
Shuai Han,Cai Xu,Jun Li,Jia Guo,Jianhai Yang,Xiaozhong Wang,Liyan Dai
The selective C−H bond oxidation of toluene to benzaldehyde using molecular O2 with non-noble metal catalysts is challenging but desirable. Herein, a series of high-entropy oxides (FeCoNiCrMn)3O4 supported on mesoporous N-doped carbon was fabricated via a reverse impregnation and calcination method (denoted as HEOs@NC). It was found that high-entropy oxides (FeCoNiCrMn)3O4 nanoparticles were distributed well onto the surface of N-doped carbon, and a distinct interface between them was observed, contributing to the formation of metal-support electronic interaction. XPS and Bader charge results verified that an electron was transferred from (FeCoNiCrMn)3O4 to N-doped carbon. Under the optimized reaction conditions, 12.2% of toluene conversion and 2.0 ×10−4 mmol mg−1cat. h−1 of benzaldehyde formation rate could be obtained with 1.5HEOs@NC catalyst. Moreover, DFT calculations revealed that the supported (FeCoNiCrMn)3O4 displayed stronger adsorption ability toward N-hydroxyphthalimide, and the formation of *PhCH2OH was determined as the rate-determining step. A lower energy barrier was achieved over the supported HEOs owing to the interfacial interaction between (FeCoNiCrMn)3O4 and N-doped carbon. This work developed a supported high-entropy oxides catalyst by rational design of interfacial engineering for the aerobic C−H bond oxidation of toluene.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2026
·
IF 6.7
Wenkun Chen,Zhen Xu,Jin Dai,Yitao Liu,Jianyong Yu,Shude Liu,Bin Ding
Materials with excellent thermal resistance and infrared stealth capability have broad application potential in aerospace, national defense and military industries. Ceramic fiber aerogels are widely adopted infrared stealth materials owing to their outstanding high temperature resistance, low thermal conductivity, low bulk density and chemical stability. However, as advanced equipment continues to evolve, the environmental temperature encountered by some stealth materials exceeds 1500 °C. Existing aerogel materials are prone to structural collapse under such harsh conditions. This issue remains unresolved. Herein, ceramic fiber materials are successfully fabricated through a novel spinning process and an intracrystalline structure design strategy within fibers. These materials maintain excellent mechanical properties at 1700 °C. Subsequently, infrared stealth devices with excellent comprehensive performance are obtained by assembling three layered components. The bottom component is an aerogel with a self-locking micro/nanofiber structure. The middle component is an aerogel with a binary architecture composed of micro/nanofibers and SiC nanoparticles. The top component is an aluminum foil bonded to the middle component. Under an ultra-high temperature of 1700 °C, the cold surface exhibits an infrared radiation temperature of only 55 °C. Successful infrared stealth is achieved in extreme environments. After exposure to large temperature gradients from liquid nitrogen for 30 min to 1700 °C for 30 min, the devices still maintain excellent mechanical properties. Furthermore, they withstand 1000 cycles of compressive and shear deformation at 50% strain without dissociation under high-frequency vibration. This new generation of infrared stealth devices with outstanding structural stability, temperature resistance and thermal insulation capability can provide reliable safety protection for equipment and personnel.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Peixin Zhu,Yi Lu,Mengyao Xiao,Siyang Li,Chun He,Shuanghong Tian
Active MnO x location (inside MCM-41 pores vs. external surface) was precisely regulated. • Remarkable ozone oversolubility phenomenon within nanoconfined water was discovered. • Nanoconfinement effect triggered intrinsic inversion of reaction mechanism. • MnO x /C/MCM-41 nanoreactors perform excellently for complex wastewater treatment. Catalytic ozonation is promising for emerging contaminants (ECs) abatement but hindered by intrinsic bottlenecks: low O 3 solubility and catalytic efficiency. Herein, a series of xMn/C/M41 nanoreactors were fabricated via a two-step ligand-adsorption and metal-anchoring strategy. After pyrolysis, the optimized 3.3Mn/C/M41 nanoreactors confined ultra-small (~2 nm) mixed-valent MnO x nanoclusters and carbon within the mesopores of MCM-41, while s-3.3Mn/C/M41 (simultaneous ligand-metal complex adsorption) has 5–10 nm Mn 3 O 4 nanoparticles on the surface. 3.3Mn/C/M41 showed a 6.1 × 10 −2 min −1 sulfamethoxazole reaction rate (1.9 times that of s-3.3Mn/C/M41), > 93% removal of three other ECs, along with robust pH adaptability (3.5–10.5), matrix resistance and cycling stability. The excellent performance stems from the mesoporous confinement effects: 300-fold ozone oversolubility, rapid contaminant enrichment, and highly active MnO x nanoclusters with numerous undercoordinated Mn, oxygen vacancies, and Mn N motifs. Experimental and theoretical calculations demonstrate that the catalytic mechanism transforms from a hydroxyl radical (for s-3.3Mn/C/M41) to non-radical of electron transfer and 1 O 2 . This work provides a novel strategy to address the intrinsic bottlenecks of catalytic ozonation, and offers a promising platform for efficient remediation of emerging contaminants in complex aquatic environments. Download: Download high-res image (166KB) Download: Download full-size image
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高影响因子
危险品化学品经营许可证（带存储）