Small
·
2026
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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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高影响因子
ANALYTICAL CHEMISTRY
·
2026
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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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高影响因子
ACS Applied Energy Materials
·
2026
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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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ACTA PHYSICO-CHIMICA SINICA
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2026
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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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高影响因子
METALS AND MATERIALS INTERNATIONAL
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2026
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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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JOURNAL OF ELECTRONIC MATERIALS
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2026
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IF 2.8
Li Qiu,Zhang Tingting,Wang Yu,Li Xi,Nie Congcong,Lv Changpeng,Song Jingjing,Huang Qihao,Wu Fang
Ni(OH) 2 is considered as one of most promising oxygen evolution reaction (OER) catalysts owing to its low cost and earth abundance. Nevertheless, the low conductivity and poor intrinsic activity of Ni(OH) 2 seriously restricts its industrial application. Meanwhile, the relationship between the structure, OER activity of Ni(OH) 2 -based catalysts, and transition-metal dopants is still unclear. To meet above challenges, a series of Ni(OH) 2 –M (M = Fe, Al, Co, Cr) was prepared by a simple hydrothermal method. The experimental results confirmed that the incorporation of different metal elements into Ni(OH) 2 can not only alter the morphology and modulate electronic structure but also improve the intrinsic catalytic activity. Particularly, the Ni(OH) 2 –Fe exhibits the best OER activity, requiring 252 mV and 288 mV at 10 mA cm −2 and 100 mA cm −2 , with a Tafel slope of 39.1 mV dec −1 and superior stability (50 mA cm −2 for 30 h). This work provides a pathway to understand the relationship between structure, OER activity of Ni(OH) 2 -based catalysts, and incorporation of transition-metal elements, which facilitates the development of advanced OER electrocatalysts.
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高影响因子
POLYMER
·
2026
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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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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2026
·
IF 4.6
Sheng Liang,Zhihao Wang,Kunhong Hu,Lei Hu,Lili Wang,Lingli Liu,Ningning Zhou,Jiage Yu,Bin Chen,Xin Liang
Lithium‑sulfur (Li S) batteries based on lithium sulfide (Li 2 S) cathodes hold great promise for next-generation energy storage devices but suffer from critical drawbacks, including lithium polysulfides (LiPSs) shuttling, sluggish redox reaction kinetics, and severe safety hazards. Here, a multifunctional separator is designed by coating a nickel hydroxide (Ni(OH) 2 ) nanoflakes-decorated kelp-like porous carbon (Ni(OH) 2 /KLPC) composite onto a polypropylene (PP) membrane. The unique KLPC skeleton derived from mucor hyphae provides a three-dimensional conductive network, while the polar Ni(OH) 2 nanoflakes offer strong chemisorption for LiPSs and high catalytic activation for the interconversion between solid-phase (Li 2 S and S) and liquid-phase (LiPSs). Meanwhile, the Ni(OH) 2 nanoflakes endow the separator with remarkable flame retardancy through an endothermic decomposition process and the formation of highly flame-retardant products nickel oxide and water. Consequently, the Li S battery assembled with the Ni(OH) 2 @KLPC modified PP (Ni(OH) 2 /KLPC/PP) separator and a Li 2 S/multi-walled carbon nanotube cathode delivers a high initial discharge capacity of 1132 mAh g −1 , remarkable rate property of 320 mAh g −1 at 5.0 A g −1 , and stable long-term cycling over 750 cycles. This work presents a promising synergistic strategy for constructing high-performance and safe Li S batteries through multifunctional separator engineering.
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高影响因子
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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高影响因子
Materials Today Chemistry
·
2024
·
IF 6.7
Zhizhu Yue,Yonghe Yu,Tianjun Hu,Ying Wang,Lulu Cao,Yanxia Zhang,Yuhong Chang,Linjuan Pei,Jianfeng Jia
The development of economical multiphase photocatalysts is a significant challenge in achieving large-scale industrialization. Rational catalyst design can help in achieving efficient, energy-saving, and green catalytic reactions, making it more feasible to screen potential catalyst candidates. In this paper, we have successfully developed a high-efficiency photocatalyst Cu-doped Cu 2 WO 4 (OH) 2 (CWOH-y, where y represents the molar ratio of copper tungsten source), which can catalyze the aerobic coupling reaction of amines to produce corresponding imines under visible light irradiation. N-benzylidenebenzylamine is synthesized under visible light at 25 °C with an 89 % yield. Under natural light at around 35 °C (mean light intensity of 50 mW/cm 2 ), 94 % of the benzylamine is converted, and 97 % of the product is N-benzylidenebenzylamine. The catalyst exhibits high efficiency due to the synergistic effect of doped Cu, Cu 2 WO 4 (OH) 2 , and visible light. This combination generates a significant amount of superoxide free radicals and singlet oxygen when exposed to visible light. Furthermore, the catalyst demonstrates universality and stability with a wide range of amine derivatives. This study introduces a new environmentally friendly photocatalytic pathway for the synthesis of imines and emphasizes the potential applications of Cu 2 WO 4 (OH) 2 .
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高影响因子
JOURNAL OF RARE EARTHS
·
2026
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IF 9.6
Jiashuo Lv,Liming Xu,Fan Zhang,Danqin Li,Jie Li,Yufei Hu,Wenjing Zhou,Meisi Yu,Furui Lin,Jian Hou,Weiqiang Zhou
Nickel-based catalysts are attractive for methanol oxidation owing to their structural tunability and intrinsic activity for C–H bond activation. However, their limited ability to capture OH – at the reaction interface results in reduced energy-conversion efficiency. In this work, we demonstrate that La-Ni(OH) 2 /graphene oxide (GO) delivers a multilevel synergistic optimization that markedly enhances photoelectrochemical methanol oxidation. The random doping of La disturbs the periodicity of Ni–O lattice, which promotes surface reconstruction and the enrichment of OH – at the electrified interface. Notably, La doping-induced oxygen vacancies act as charge-trapping sites, promoting the separation of photogenerated electron-hole pairs. More photogenerated holes can reach the reaction interface and participate in oxidation, synergistically enhancing the photoelectrocatalytic efficiency. By optimizing the interfacial microenvironment, the La-Ni(OH) 2 /GO catalyst achieves a current density of 179.8 mA/cm 2 in alkaline medium and increases to 222.6 mA/cm 2 under illumination.
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高影响因子
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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高影响因子
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