CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Chao Li,Qiliang Gao,Meng Zhang,Jiahao Wang,Faen Song,Junfeng Zhang,Qingde Zhang,Yizhuo Han
Dry reforming of methane (DRM) represents a highly promising process for syngas production, as it simultaneously utilizes two predominant greenhouse gases (CH 4 and CO 2 ). However, the deactivation caused by carbon deposition, which originates from rate gap between carbon accumulation and removal, has been one of the most difficult problems solved, severely restricting its application. Herein, a series of hydroxyapatite (CaHAP) supports with structural hydroxyl (-OH) replaced by F − (CaHAP-xF) were employed to prepare Ni/CaHAP-xF catalysts for DRM. Effects of F − introduction on the surface property of CaHAP supports and DRM reaction behavior were explored. Ca 2p XPS and CO 2 -TPD indicate that F − weakens the electron density of adjacent Ca 2+ (which is the main CO 2 adsorption site), thereby enhancing the CO 2 adsorption. FT-IR, H 2 -TPR, TEM, and CO 2 -DRIFTS, in combination with reaction test results, manifest that F − incorporation modulates -OH quantity on the surface and activates the neighboring structural -OH, which strongly affects the distribution of the adsorbed CO 2 , as well as the existing state of the introduced Ni. Appropriate F introduction promotes Ni dispersion, resulting in high CH 4 cracking rate. Further, it is testified that the structural -OH species participate in the decarbonization reaction, especially those activated by F significantly accelerate the carbon removal. Thus, the catalyst with high dispersion of Ni (2Ni/CaHAP-0.98F) exhibits the best performance of DRM under the harsh conditions. CH 4 and CO 2 conversions of 59.2% and 72.8% were achieved at low temperature (700 °C) and high WHSV (48,000 mL·h −1 ·g −1 ).
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TRIBOLOGY INTERNATIONAL
·
2026
·
IF 7.6
Jiajia Cen,Shuangqi Li,Kai Chen,Dekun Zhang
Polyetheretherketone (PEEK) possesses excellent corrosion resistance, moderate friction properties, and high‑temperature stability. However, under severe operating conditions, its coefficient of friction (COF) and wear rate increase significantly, limiting broader application. In this work, P‑MoS₂ was synthesized in situ on a PEEK matrix using a hydrothermal method, while K‑BN‑OH was prepared via surface grafting with a coupling agent. Both fillers were then blended with a PEEK/PTFE matrix to produce a novel PEEK/PTFE/P‑MoS₂/K‑BN‑OH composite. Orthogonal experiments identified the optimal composition of PEEK/PTFE/P‑MoS₂, which exhibited the best overall performance. The effect of K‑BN‑OH content on the mechanical, thermal, and tribological properties of the composites was systematically studied. Tribological behavior under varying conditions was analyzed to elucidate wear mechanisms and filler synergy. Results show that the composite with 25% PTFE and 5% P‑MoS₂ achieved the most balanced performance: elastic modulus (1414.62 MPa), compressive strength (127.81 MPa), COF (0.108), and wear rate (1.81 ×10⁻⁶ mm³/N·h) decreased by 22.58%, 35.82%, 73.13%, and 59.78%, respectively, compared to pure PEEK, while creep strain (2.77%) increased by 95.62%. Further addition of 3% K‑BN‑OH enhanced mechanical and thermal properties: elastic modulus rose to 1520.13 MPa, compressive strength to 131.33 MPa, creep strain fell to 1.82%, and thermal conductivity reached 0.294 W/m·K. The average coefficient of friction(ACOF) declined to 0.094, though wear rate rose slightly to 2.26 × 10⁻⁶ mm³/N·h. Tribological tests revealed that wear rate increased with rotational speed, while ACOF showed a non‑monotonic trend, first decreasing and then increasing. With increasing load, both ACOF and wear rate initially decreased before rising, reaching minima at 20 N (0.077 and 2.09 ×10⁻⁶ mm³/N·h, respectively). Molecular dynamics simulations elucidated that PTFE formed a lubricating film through interfacial enrichment, while MoS₂ enhanced matrix ordering and promoted interfacial slip via π-π stacking and C-S bonding. In contrast, h-BN disrupted the synergistic lubrication network established between PTFE and MoS₂ due to its spatial blocking effect. This work systematically elucidates the synergistic mechanisms of fillers from the microscopic level to macroscopic performance, providing a theoretical basis for the design of high‑performance PEEK composites tailored to specific operating conditions.
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ACTA PHYSICO-CHIMICA SINICA
·
2026
·
IF 13.5
Yongkang Liu,Shouxi Yu,Li Chen,Zhongliao Wang,Meiyu Zhang,Jinfeng Zhang
Covalent organic frameworks (COFs) are widely studied as photocatalysts for the hydrogen evolution reaction (HER), yet most design strategies target light absorption or charge separation rather than the H* desorption barrier at the catalytic site itself. We re-examine the problem from a bond-resolved view: the crystal orbital Hamilton population (COHP) is used to treat the occupancy of the N−H antibonding manifold as a quantitative descriptor of how strongly the imine nitrogen of a Schiff-base COF binds H*. Two pyrene-based COFs, PY-BD and PY-DHBD, are synthesized to test the descriptor. Adding two phenolic −OH groups to the dialdehyde linker raises the antibonding occupancy (ICOHP from −7.52 to −7.18 eV), weakens the N−H bond, and shifts Δ G H* from −0.22 to 0.04 eV, close to thermoneutrality. The visible-light H 2 -evolution rate accordingly rises from 450 to 1127 μmol g −1 h −1 , 2.5-fold the rate of PY-BD. The work places COHP-resolved antibonding occupancy alongside the d -band-centre framework familiar from metal catalysis as a quantitative descriptor for tuning HER on N-rich COF active sites. Grafting electron-donating phenolic –OH groups onto a pyrene-based COF raises the N-H antibonding-orbital occupancy for photocatalytic H 2 evolution under visible light. Download: Download high-res image (149KB) Download: Download full-size image
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METALS AND MATERIALS INTERNATIONAL
·
2026
·
IF 4.5
Tan QingRong,Zhu Jiyuan
The corrosion susceptibility of magnesium alloys is the most formidable challenge in large-scale applications. In this work, a highly corrosion-resistant coating was fabricated on a magnesium-alloy surface to protect the underlying substrate. Unlike conventional hydrothermal methods, this approach does not improve corrosion resistance by altering the coating’s precursor materials; instead, it focuses on investigating grain behavior at different temperatures to regulate the coating’s corrosion resistance. By extending the heating duration, the coating exhibited increased thickness, grain refinement, and a denser, more ordered arrangement, which effectively blocked corrosive ions and consequently led to a significant improvement in corrosion resistance. To verify corrosion-resistance performance, the as-prepared coatings were immersed in a saturated sodium chloride solution for 15 days; the coatings exhibited almost no corrosion, whereas the magnesium substrate had nearly completely dissolved by day 10. Additionally, when coated samples were immersed in an HCl solution at pH 2 for 15 days, only slight surface corrosion was observed on the coatings. Electrochemical tests indicated that when the heating duration was extended to 5 h, corrosion resistance reached its maximum: the coating’s impedance was six orders of magnitude higher than that of the substrate, and its corrosion current density decreased by five orders of magnitude, consistent with the immersion tests. Here, grain refinement and dense packing played critical roles by reducing porosity and crack density, thereby blocking the ingress of chloride and other corrosive ions. These results further confirm that grain refinement achieved by prolonging the heating duration provides a novel strategy for enhancing the performance of corrosion-resistant coatings. Graphical The alternative text for this image may have been generated using AI.
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POLYMER
·
2026
·
IF 5.1
Yunlong Xu,Zhibo Zhao,Yanan Li,Yiwen Yang,Wenbo Wang,Le Zhang,Long Yu
A new methodology to fabricate the compatibilizer for PLA/PBAT blends through ring-opening polymerization of lactide using hydroxyl-terminated PBAT (HO-PBAT-OH) as macro-initiator in a high-shear reactor was developed. The modified polylactic acid (PLA-b) with weight-average molecular weights ( M w ) in the range of 1.42 × 10 5 to 2.96 × 10 5 Da were synthesized using 1%∼4% content of HO-PBAT-OH with M w of 4.86 × 10 5 Da. FTIR and NMR spectroscopy confirmed the covalent attachment of PBAT segments to the PLA backbone through ester linkages, establishing a well-defined block architecture. This block structure substantially improved the interfacial compatibility between PLA-b and PBAT, as evidenced by a refined morphology with reduced PBAT domain sizes and enhanced interfacial adhesion. DSC and DMA revealed a convergence of the glass transition temperatures ( T g ) of the two constituent polymers, indicating the improved miscibility. Rheological measurement also confirmed the improvement of miscibility through presenting a more coherent viscoelastic response. Notably, PLA-b/PBAT blends at a 70/30 wt% ratio exhibited a superior balance of mechanical properties compared to a conventional PLA/PBAT physical blend of the same composition, delivering a tensile strength of 42.6 MPa, an exceptional elongation at break of 280% and impact strength of 28.11 kJ/m 2 . This approach provides a simple and economically viable route to high-performance PLA/PBAT blends with an optimized combination of strength and ductility.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Qi Zhang,Qihui Ding,Ning Ma,Wei Wu
As an important component of flexible Zinc-air batteries (ZAB), the gel electrolyte has a direct impact on battery performances and applications. Polyvinyl alcohol (PVA) is a commonly used electrolyte matrix material in ZAB, which has film-forming and environment-friendly, but poor mechanical properties and ionic conductivity limit its application in flexible ZAB. As a new type of environment-friendly solvent, deep eutectic solvent (DES) not only has the extremely low volatility, excellent electrochemical stability and excellent thermal stability, but also has the advantages of low cost and stable performances. Hydroxy-boron nitride nanosheets (OH-BNNSs) are obtained by grafting hydroxyl groups onto boron nitride nanosheets. In this paper, PVA was modified by carboxymethyl cellulose (CMC) firstly. After adding DES and OH-BNNSs, the deep eutectic gel electrolyte was obtained by cryogenic freezing. The optimized system containing 50 wt% DES and 1 wt% OH-BNNSs demonstrated remarkable enhancements. Ionic conductivity increased to 137.61 mS·cm −1 , representing a 1.86-fold improvement over conventional PVA-based electrolytes. Electrolyte uptake rate reached 183.5% with 88.7% retention rate after 12 h, achieving 2.03-fold and 1.92-fold of the performance of PVA, respectively. Mechanical properties showed substantial gains, with elongation at break escalating to 586% (3.66 times better than PVA) and tensile strength registering 0.55 MPa. When implemented in ZAB, power density peaked at 35.3 mW·cm −2 , surpassing pure PVA by 4.53-fold. Cycling stability exhibited prolonged durability, sustaining 110 cycles over 36.7 h at 1 mA·cm −2 . Single discharge duration attained 10.7 h. Our paper provides design scheme and theoretical references for application and progress of flexible devices.
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DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 27
·10320-10326
·
IF 4.052
Ying-Jie Jia,Yi-Gang Chen,Ting Wang,Yao Guo,Xiao-Fang Guan,Xian-Ming Zhang
Two new alkali–metal bismuth iodates KBi(IO3)3(OH) (1) and NaBi(IO3)4 (2) have been synthesized by a hydrothermal method via tuning of alkali–metal ions. Compound 1 crystallizes in the space group P and features a [Bi(IO3)3(OH)]n chain with eight-membered Bi–O–I–O–Bi–O–I–O rings. The [Bi(IO3)3(OH)]n chain consists of paddlewheel-like dimeric Bi2(OH)2(IO3)4 units linked by IO3 pairs. Compound 2 in the polar space group Cc features a [Bi(IO3)4]− double layer with Bi4I4 eight-membered rings (8-MRs). NaBi(IO3)4 exhibits a strong second harmonic generation (SHG) response of ∼5.0 × KDP (KH2PO4) and a wide transmittance window (0.4–12 μm), and structure analyses and theoretical calculations reveal that polarization results mainly from the proper alignment of the IO3 groups. The calculated electronic structure based on the DFT method indicates that the BiOn and IO3 groups dominate their optical properties.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Hui-Hui Cao,Zhen-Hong He,Rui-Peng Yan,Xuanlu Fan,Weitao Wang,Kuan Wang,Huan Wang,Hui Ma,Xiaojuan Lai,Zhao-Tie Liu
Fe- and Cu-based catalysts are top candidates for the oxygen/hydrogen-evolution reactions, but their large-scale application is limited by rapid degradation under prolonged operation, especially at high current densities and high temperatures. Herein, a FeOOH/Cu(OH) 2 nanotube array grown on copper foil was designed for overall water-splitting. The structure enhances the electrochemical surface area, increases catalytic site density, and accelerates gas transport. DFT calculations confirms the Cu(OH) 2 and FeOOH synergy weakens HO–H bond, optimizing the ∗H adsorption energy, and driving reaction kinetics. In 1 M KOH, it achieves HER overpotentials of only 89 and 244 mV, and OER overpotentials of 124 and 424 mV at 10 and 100 mA cm −2 , respectively. Under industrial conditions (30% KOH, 65 °C), it sustains >2 A cm −2 for 100 h with negligible HER activity loss. This work provides a practical guide for designing high-activity, ultra-stable ampere-level water-splitting catalysts.
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ACS Applied Energy Materials
·
2026
·
IF 5.5
Liang Wan,Shaoyan Wang,Can Lei,Chuqian Xiao,Sheng Hu,Yikai Yang,Xingchen Ye,Dongqi Liu,Xiuming Bu,Ming Gong,Xiulan Hu,Xianying Wang
Electrocatalytic 5-hydroxymethylfurfural oxidation (HMFOR) is a sustainable route for biomass valorization to 2,5-furandicarboxylic acid (FDCA), yet balancing the competitive adsorption of HMF and OH− at the electrode−electrolyte interface is pivotal for boosting catalytic activity and selectivity. Herein, we report a terephthalic acid (PTA) modification strategy to tailor Cu-Ni(OH)2 with tunable metal valence and controllable surface charge, fabricating positively charged Cu-Ni(OH)2 and negatively charged Cu-Ni(OH)2-PTA. PTA functionalization elevates the Ni oxidation state and reinforces HMF adsorption on the catalyst surface. In situ surface-enhanced Raman spectroscopy and electrochemical impedance spectroscopy confirm that the negatively charged surface of Cu-Ni(OH)2-PTA efficiently mitigates the steric hindrance of hydrated ions and preserves a fully hydrated Cs+ interfacial microenvironment. This synergy optimizes the adsorption equilibrium of HMF and OH− via efficient and persistent HMF capture, enabling continuous enhancement of HMFOR activity. Consequently, Cu-Ni(OH)2-PTA delivers superior HMFOR performance in CsOH electrolyte, including a high FDCA Faradaic efficiency (98.2%), large current density, excellent cycling stability over 10 cycles, and stable operation for 120 h in a membrane electrode assembly (MEA) system. Notably, a high FDCA Faradaic efficiency of ∼86% is retained even in a pH 13 electrolyte with 1 M Cs+. This work elucidates the coupled effects of metal valence, surface charge, cation hydration, and interfacial water structure on HMFOR, providing a universal interfacial engineering principle for designing advanced electrocatalysts for efficient biomass electrooxidation.
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Small
·
2026
·
IF 11.8
Xinyi Han,Ziliang Deng,Yongping Yang,Zipeng Zhao
Self-supported electrodes represent a promising anode architecture for anion exchange membrane water electrolyzers; however, their practical implementation is hindered by an insufficient understanding of their formation mechanisms and the consequently limited catalytic efficiency and stability. In this work, we developed a self-supported electrode comprising a composite catalyst of β-Ni(OH) 2 and NiFe layered double hydroxide (LDH), grown on nickel felt (denoted as Ni(OH) 2 /NiFe-LDH/NFt) via a one-step hydrothermal process. We systematically investigated and clarified the role of NH 4 F in governing the synthesis of self-supported Ni(OH) 2 /NiFe-LDH/NFt. The coordination effect of F − with Fe 3+ and etching effect of NH 4 + on the surface oxide layer of nickel felt leads to favorable heterogeneous nucleation. Moreover, the etching effect provides an additional Ni source that favors the deposition of Ni(OH) 2 on NiFe-LDH. However, excess NH 4 + leads to the formation of Ni-based complex compounds in solution during the hydrothermal process and suppresses the deposition of Ni(OH) 2. When applying as the Ni(OH) 2 /NiFe-LDH/NFt anode catalyst in practical anion exchange membrane water electrolysis, it requires only 1.81 V to deliver 1.0 A cm −2 and exhibits outstanding durability, with no noticeable performance decay after 750 h of continuous operation at 0.5 A cm −2 .
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PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2026
·
IF 7.3
Bairong Fu,Dongqin Tan,Jing Jin,Lei Tong,Longxing Wang,Yihou Peng,Ningbo Geng,Lidong Wu,Huilian Ma,Yuwen Ni,Jiping Chen
The fragmentation behavior of isomeric hydroxylated polybrominated diphenyl ethers (OH-PBDEs) remains poorly elucidated, although LC-MS/MS is essential for their analysis. This study systematically characterizes their fragmentation behavior by LC-ESI-MS2, elucidating relationships between product ions, structural features, and instrument detection limits. Results demonstrated congener-specific variability in the signal intensity of [M–H]−, particularly among isomers. Fragmentation behavior is highly dependent on the hydroxyl location on the diphenyl ether scaffold, as well as the bromine substituent pattern. Three distinct mechanisms are identified: (1) Br abstraction via free radical-mediated rearrangement cleavage in meta-hydroxylated PBDEs, (2) preferential formation of the [Br]− ion via γ-elimination in ortho-hydroxylated PBDEs, and (3) characteristic formation of bromobenzoquinone anions via multistep fragmentation mechanisms in para-hydroxylated PBDEs. Furthermore, the ortho-effect, particularly pronounced in 2′–OH substituted congeners, significantly alters the fragmentation pathways. While the elucidated fragmentation pathways provided structural insights, the inherent weak signals challenged detection. A sensitivity-enhancing precolumn derivatization protocol with dansulfonyl chloride was introduced to solve the problem. The MS2 fragmentation of these derivatives was conveniently dominated by the cleavage of the C–S bond within the dansyl group, yielding abundant diagnostic ions that greatly aided in structural confirmation. As predicted, the derivatization strategy achieved a remarkable up to 15-fold improvement in the sensitivity. This investigation advances the understanding of OH-PBDE fragmentation, establishes an identification framework using specific patterns and diagnostic ions, and demonstrates a practical derivatization approach for enhanced sensitivity, elucidating structure-fragmentation relationships in brominated aromatics and providing methodological guidance for future analysis.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 11
·5546-5554
·
IF 3.3
Wenwen Yang,Shan-Shan Xu,Yawen Niu,Yanhui Zhang,Jian-Feng Li,Juan Xu
As a member of the ternary sulfides, CdIn2S4 is a visible light responded catalyst with a band gap of 2.2–2.6 eV, which is suitable for solar spectrum. In this study, a simple two-step solvothermal method was used to construct Ni12P5/In(OH)3/CdIn2S4 composite catalysts with type-II and Z-scheme heterojunctions, and there was a synergy between the two heterojunctions. The Ni12P5/In(OH)3/CdIn2S4 composite catalyst formed a donor-mediator-acceptor system for photogenerated electrons, which greatly improved the separation efficiency of the photogenerated carriers. Moreover, the highest hydrogen production activity achieved by the Ni12P5/In(OH)3/CdIn2S4 composites was 5.75 mmol g−1 h−1, which was 21 times the original CdIn2S4.
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危险品化学品经营许可证（带存储）