Small
·
2024
·
IF 13
Hongbo Zhang,Yiting Zhao,Zhenfeng Cheng,Jingyun Jiang,Jianwei Fu,Qun Xu
To meet the industrial demand for overall water splitting, oxygen evolution reaction (OER) electrocatalysts with low-cost, highly effective, and durable properties are urgently required. Herein, a facile confined strategy is utilized to construct 2D NiFe 2 O 4 /Ni(OH) 2 heterostructures-based self-supporting electrode with surface-interfacial coengineering, in which abundant and ultrastable interfaces are developed. Under the high molar ratio of Ni/Fe, both spinel oxide and hydroxides phases are formed simultaneously to obtain 2D NiFe 2 O 4 /Ni(OH) 2 heterostructure. The in-depth analysis indicates that the NiFe 2 O 4 /Ni(OH) 2 interface displays strong electronic interactions and triggers the formation of crystalline-amorphous coexisting catalytic active NiOOH. Meanwhile, the stable catalyst-collector interface favors the electron transfer and oxygen molecules transport. The resultant 2D NiFe 2 O 4 /Ni(OH) 2 @CP electrode exhibits superior OER performance, including a low overpotential of 389 mV and a long operating time of 12 h at 1 A cm −2 . This work paves a novel method for fabricating efficient and low-cost electrocatalysts for electrochemical conversation devices.
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2025
·
IF 3.7
Jun Shen,Changhui Liang,Yuxin Zhang,Xiaoqiang Zhang,Huixiang Li,Yongxin Li,Songhai Xie,Z. Conrad Zhang
Bioethanol and furanics are currently prevailing additives to fossil-based transportation fuels. With the objective to lift the longstanding limitations of these biofuel additives, this work reports for the first time the synthesis of 2-ethoxy-2-methyltetrahydrofuran (2-EO-2-MTHF) as a co-upgraded fuel by reacting ethanol with 2-methylfuran (2-MF). The formation of 2-EO-2-MTHF is achieved through ethanol ethoxylation of 2-MF, enabled by a reverse Ni(OH) x /Ni catalyst under hydrogen pressure. Nickel hydroxide species over the Ni nanoparticles play a crucial role in activating ethanol and polarizing the partially hydrogenated dihydrofuran intermediates, favorably steering the reaction selectively toward the ethoxylation product. The reaction conditions, including pressure and temperature, are systematically optimized to enhance the yield of 2-EO-2-MTHF, and provide a means to beneficially tune the fuel compositions consisting mainly of 2-EO-2-MTHF and 2-MTHF, both are high energy density molecules. Importantly, the reverse Ni(OH) x -Ni catalyst allows a one-pot process to accomplish consecutive partial hydrogenation of 2-MF and ethanol ethoxylation. This work provides a practical strategy for upgrading biomass-derived polar primary fuel molecules into more versatile fuels and chemicals.
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ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Shuanglong Xiao,Fan Zhang,Jilin Wang,Lulu Wang,Jia Ju,Yang Zhang
Although the anion exchange membranes (AEMs) prepared through superacid-catalyzed polymerization exhibit high alkaline stability, the hydrophobic microdomains in the AEMs impede OH– conduction. To fabricate AEMs with both high conductivity and alkaline stability, ether-free poly(aryl piperidine) is synthesized herein via superacid-catalyzed polymerization, which is then modified by the uneven side-chain cations simultaneously. The uneven side-chain cations possessing different lengths are advantageous for the dispersion of the cations, which can broaden OH– conducting channels. PAP-TP-Pip-50% membrane with the most uniform dispersion of cations possesses the highest water uptake (151.1%) and OH– conductivity (220.8 mS cm–1) at 80 °C among the prepared AEMs. The ether-free backbones and alkyl spacers, along with high water absorption caused by the broadened OH– conducting channels, endow PAP-TP-Pip-50% with excellent stability. After immersion in a 1 M NaOH solution (80 °C, 3000 h), the conductivity of PAP-TP-Pip-50% remains at 94.56% and PAP-TP-Pip-50% still possesses excellent mechanical properties. The single cell with PAP-TP-Pip-50% exhibits a peak power density of 1.77 W cm–2 (80 °C). After a 150 h endurance test, the voltage loss is just 94 mV. All these demonstrate that broadened OH– conducting channels through grafting uneven side-chain cations are an effective strategy for designing AEMs.
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TALANTA
·
2025
·
IF 6.1
Shihong Xin,Zhiyue Wang,Shudan Wu,Xueqing Yong,Jun Yan,Yunlin Chen
Optical sensor research has drawn great attention for significant market potential and a wide range of applications. Ammonia (NH 3 ) is a gas widely used in industry, but it is also a significant safety hazard for its toxicity, corrosiveness and explosiveness. However, it is challenging to create reliable NH 3 optical sensors with high sensitivity, excellent selectivity and fast response simultaneously. In this work, heterostructure membrane Fabry ‐ P e ´ rot (F–P) cavities constructed by LiCl@MIL-53-(OH) 2 (LiCl was anchored in MIL-53-(OH) 2 ) and TiO 2 (LiCl@MIL-53-(OH) 2 /TiO 2 ) were fabricated for NH 3 detection. Compared to the MIL-53-(OH) 2 /TiO 2 heterostructure membrane F–P cavity, the LiCl@MIL-53-(OH) 2 /TiO 2 heterostructure membrane F–P cavity exhibited superior sensing performance toward NH 3 . Experimental results indicated that the LiCl@MIL-53-(OH) 2 -2.0/TiO 2 heterostructure membrane F–P cavity exhibited excellent selectivity and sensitivity (3.075 nm/ppm), and the lower detection limit achieved to 98 ppb. The results were attributed to the multiple actions of hydrogen bonding of NH 3 with Cl − and NH 3 coordination to Li + . Additionally, the sensor showed fast optical response time 500 ms, outstanding repeatability and stability. The sensitivity of LiCl@MIL-53-(OH) 2 -2.0/TiO 2 heterostructure membrane F–P cavity toward NH 3 at 2.5 ppm and 25 ppm is outstanding, showing the F–P cavity offers a promising solution for real-time NH 3 monitoring. Therefore, LiCl was introduced into MIL-53-(OH) 2 /TiO 2 F–P cavity NH 3 sensor, which provides a new idea for future optical gas sensors with high performance for gas sensing.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wenzhuo Li,Yuanyuan Chen,Yufeng Wang,Mengyi Wang,Lei Cheng,Lixian Sun,Puxuan Yan
Compared with micro-nano powder, the integral catalyst shows the advantage of easy recovery in practical applications. Aerogel exhibit a lightweight and porous skeletal structure, making it one of the excellent carrier options in integral catalyst. Here, the novel aerogel composite is prepared by sol-gel and freeze-drying, in which including chitosan, cellulose, carbon nanofiber and micron composite catalyst. Then, nano Co 2 B is in-situ loaded onto the surface of micron flower shaped Co(OH) 2 , forming the catalyst. The results show the hydrogen generation rate of Co 2 B@Co(OH) 2 is 8117.7 mL min −1 g −1 , higher than most of the published literatures, which is attributed to crystal and amorphous interface, nano structure and mass transfer pathway. Meanwhile, the hydrogen generation rate of the aerogel composite is 6022.8 mL min −1 g −1 , showing high exposure rate of active sites (74.2 %) and low mass loss rate (7.3 %), due to the chemical cross-linking between chitosan and glutaraldehyde, and porous and fibrous network skeleton formed between different components. The natural polymer-based aerogel exhibits the combined advantages of being biodegradable, recyclable, and serving as self-assembled micro-nano powder catalysts.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Qiang Bi,Cai Zhang,Yumiao Zhang,Kechun Wang,Shiping Zhao,Haodi Song,Juanqin Xue
Dual-atom catalysts (DACs) possess outstanding catalytic properties arising from unique intermetallic synergistic effects and electronic coupling, yet the precise construction of cooperative reaction centers remains a critical challenge. In this study, a synergistic electrostatic modulation strategy is employed to anchor Zn Co dual-atomic sites onto an S/N co-doped carbon substrate (Zn,Co-DAC/SNC), in which Zn and Co are cooperatively distributed at an interatomic distance of 2.59 Å within an N3 Zn Co N/C/S coordination environment, forming stable reactive centers. Sulfur doping induces Zn-p/Co-d orbital coupling, which strengthens electronic synergy and promotes efficient ·OH generation, endowing the catalyst with excellent ibuprofen (IBP) degradation activity (>98 %). In this system, Co serves as the primary active center responsible for O O bond cleavage, Zn modulates the electronic structure to enhance ·OH yield, and sulfur atoms stabilize metal coordination while regulating interfacial charge. Under sulfur regulation, the Zn Co bimetallic centers induce electron redistribution and an upshift of the d-band center, thereby lowering the O O bond cleavage barrier (−3.79 eV) and preferentially driving one-step bond scission to yield dual ·OH. This work elucidates the Zn/Co/S ternary synergy in H 2 O 2 activation and provides theoretical guidance for the structure-activity design of multimetal-heteroatom catalysts.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2025
·
IF 4.6
Pengfei Tian,Yunan Shen,Yuzhe Hua,Zilong Chen,Zhifan Chen,Qingjie Guo,Hongjing Tian
Calcium lignosulfonate, an important natural anionic surfactant widely used in chemical, agricultural and construction applications, was employed to enhance the desulfurization performance of Ca(OH) 2 by adjusting its crystal growth at the atomic level. In the digestion of CaO, calcium lignosulfonate was selectively adsorbed onto the 101 surface of Ca(OH) 2 crystal by the interaction between the sulfonic acid group of calcium lignosulfonate and Ca(OH) 2 surface. The specific adsorption was proved to inhibit the growth of the 101 crystal surface owing to the steric hindrance and electronic interactions. DFT calculations show that the adsorption energy is −1.70 eV, and the change in free energy is negative, indicating spontaneous adsorption. By XRD and SEM characterization results and DFT simulation results, while boost the Ostwald ripening of the 001 surface to form the ultrathin nanosheets with a thickness of 16–21 nm. PDOS simulation results testified that the transferring of lone pair electrons from 2p orbital to the empty 3d-orbitals of calcium and the formation of Ca-O bond because of 0.08 Ha blue shift and broadening of the 2p-orbitals of oxygen. Additionally, the calcium lignosulfonate (CLS) modified Ca(OH) 2 exhibited the increase of BET surface area by 62 % from 30.09 m 2 /g to 48.76 m 2 /g and developed a mesoporous structure with the pore volume of 0.248 cm 3 /g. Consequently, the sulfur capacity of Ca(OH) 2 –15.62 mg/g in comparison to pristine Ca(OH) 2 without CLS, while the penetration times for desulfurization experiments increased from 3300 s to 7600 s.
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CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
·
2025
·Vol. 44
·期 10
·100707
·
IF 10.3
Xiaodong Zhang,Bohui Xu,Deshuai Xiao,Xinyuan Zhang,Pifu Gong,Zheshuai Lin
Non-centrosymmetric (NCS) crystalline structures, critical for second harmonic generation (SHG) in all-solid-state lasers, are far less prevalent than their centrosymmetric (CS) counterparts. In this study, we report a structural transformation from CS to NCS configuration in benzenesulfonate derivatives via hydroxyl group incorporation, as illustrated by the transition in the newly discovered CN 3 H 6 C 6 H 5 SO 3 (CS) and CN 3 H 6 C 6 H 4 SO 3 (OH) (NCS). The introduced hydroxyl groups induce hydrogen bond reconstruction, effectively breaking the original centrosymmetry. The resulting NCS compound exhibits remarkable nonlinear optical (NLO) properties, including a strong SHG response (1.6 × KDP with the particle sizes of 200–250 μm), a wide bandgap (UV cutoff at 290 nm, corresponding band gap is 4.37 eV), and a large birefringence (0.21@1064 nm), demonstrating excellent potential as an UV NLO crystal material.
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Small
·
2021
·Vol. 17
·期 35
·2101720
·
IF 13.281
Yijie Wang,Aoshuang Li,Chuanwei Cheng
Developing highly active, cost-effective, and durable bifunctional oxygen electrocatalysts is an important step for the advancement of rechargeable Zn–air batteries (ZABs). Herein, an efficient bifunctional oxygen electrocatalyst of ultrathin Co(OH) 2 nanosheets supported on nitrogen-doped carbon nanoflake arrays (named as Co(OH) 2 @NC), is reported, which yields excellent bifunctional activity, i.e., a low overpotential of 285 mV to reach 10 mA cm −2 for oxygen evolution reaction (OER), a high half-wave potential (0.83 V) for oxygen reduction reaction (ORR), and a low potential gap (Δ E ) of 0.69 V. The excellent bifunctional catalytic performance can be ascribed to the concerted efforts of cobalt hydroxide toward OER and nitrogen-doped carbon for ORR. The Co(OH) 2 @NC nanoflake arrays is further used as binder-free air cathodes for rechargeable Zn–air batteries, exhibiting a high specific capacity of 798.3 mAh g Zn −1 , improved stability (a working life of >70 h at 5 mA cm −2 ), as well as a reduced long-term charging voltage, which outperforms the counterparts of NC nanoflake arrays and Pt/C-based air cathodes. One step further, the Co(OH) 2 @NC nanoflake arrays on carbon cloth are directly used as binder-free air cathodes for flexible, solid-state ZABs, showing excellent performance under deformation as well.
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Journal of Coatings Technology and Research
·
2019
·Vol. 16
·期 6
·1715-1725
·
IF 1.584
Yang Danqi,Zhang Chong,Dong Luming,Hou Xudong,Zheng Weikang,Xu Jianzhong,Ma Haiyun
A nanorod-structured strontium hydroxystannate [SrSn(OH) 6 ] flame retardant was synthesized via a facile coprecipitation method and employed in epoxy resin (EP). Based on X-ray diffraction analysis, scanning electron microscopy, and transmission electron microscopy, the as-synthesized SrSn(OH) 6 nanorods exhibited high crystallinity and uniform size distribution. The flame retardancy and smoke suppression properties of EP/SrSn(OH) 6 composites were investigated by limiting oxygen index and cone calorimetry tests. The results showed that incorporation of SrSn(OH) 6 led to a dramatic reduction of the fire hazards of EP, including a 21.9% maximum decrease in the peak heat release rate, a 33.3% reduction in the toxic CO yield, and a 133.3% increase in the char residue. In particular, this is the first attempt to evaluate the flame retardancy properties of SrSn(OH) 6 nanorods in EP. The improved flame retardancy properties of the SrSn(OH) 6 nanorods is attributed to their catalytic carbonization effect.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jiahui Liu,Hongchen Liu,Fan Yang,Junpu An,Siyuan Sun,Yang Sun,Kexin Wei,Xinyang Sun,Junwei Yuan,Meitong Zhao,Haojia Zhong,Kuobo Wang,Jintian Ren,Zhenxing Li,Yongfen Li
The electrochemical oxidation of biomass-derived 5-hydroxymethylfurfural (HMF) represents a promising pathway to synthesize the critical polymer monomer 2,5-furandicarboxylic acid (FDCA). However, the restricted adsorption of both HMF and OH − to the catalyst surface results in low activity and selectivity. To address this issue, this study introduced an electrochemically assisted strategy to synthesize Ni aerogel with Cu heteroatom doping (Ni 0.94 Cu 0.06 /NF), demonstrating excellent performance for HMF to FDCA conversion in alkaline media. The catalyst achieves 10 mA cm −2 at 1.307 V vs. RHE, with outstanding Hydrogen evolution reaction (HER) activity (10 mA cm −2 @11 mV). Notably, the conversion rate of HMF, the selectivity of FDCA and the Faraday efficiency can reach 99.5 %, 99 % and 97 %, respectively. Scanning Electron Microscope (SEM) and transmission electron microscopy (TEM) demonstrated that the aerogel's self-supported 3D framework with interwoven nanowire structure enables efficient exposure of catalytic sites. X-ray photoelectron spectroscopy (XPS) analysis further showed the modification with Cu forms unique Ni O Cu linkage within the catalyst's surface region, which effectively adjusts the electronic configuration of Ni sites and increases lattice oxygen content, thereby enhancing HMF adsorption. Density functional theory (DFT) revealed that the synergistic interplay between Ni and Cu markedly boosts the uptake capacity for both HMF and OH − , improves the rate-determining step (RDS) thermodynamics by reducing its barrier, and consequently accelerates the HMF oxidation reaction (HMFOR). Our findings elucidate fresh perspectives into the structure-performance relationship of nickel-based catalysts and offer a novel approach for designing advanced electrocatalysts for biomass upgrading.
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JOURNAL OF MOLECULAR STRUCTURE
·
2026
·
IF 4.9
Ping Zhang,Qin-Wen Shi,Wen-Yuan Wu,Jun-Feng Bai
An anionic 3D MOF featuring 9-connected Ni 3 ( μ 3 -OH) secondary building units (SBUs), (Me 2 NH 2 ) 2 [Ni 6 (OH) 2 (Bpdc) 3 (4-Ptz) 6 ]·11H 2 O (NJTU-Bai90; NJTU-Bai denotes Nanjing Tech University Bai’s group), was hydrothermally synthesized using the bifunctional ligands bicyclo[1.1.1]pentane-1,3-dicarboxylic acid (H 2 Bpdc) and 4-(2H-tetrazol-5-yl)pyridine (4-HPtz). This MOF crystallizes in I-43 m space group and possesses intersecting 3D channels packed by trigonal-pyramidal and tetrahedral cages. Tailored for reversible C 2 H 6 adsorption and one-step purification of polymer-grade C 2 H 4 , NJTU-Bai90 not only has a high BET surface area of 1465.7 m 2 g −1 but also exhibits excellent stability in aqueous solutions at room temperature for at least one month. NJTU-Bai90 exhibits superior C 2 H 6 uptake (97.6 cm 3 g −1 at 298 K and 82.5 cm 3 g −1 at 308 K, both measured at 1 bar) in comparison with C 2 H 4 (85.5 cm 3 g −1 at 298 K and 68.4 cm 3 g −1 at 308 K, both measured at 1 bar). Remarkable IAST selectivity values (1.51 and 1.56, respectively) are maintained even at elevated temperatures. Furthermore, dynamic breakthrough experiments demonstrate that a C 2 H 6 /C 2 H 4 mixture (1/15, v/v) can be efficiently separated in one step and that polymer-grade C 2 H 4 yielding with a productivity of 19.1 mL g −1 at 298 K and 1 bar. The distinct retention times of C 2 H 6 and C 2 H 4 on NJTU-Bai90-packed separation columns further highlight the material’s great potential for industrial gas separation applications.
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危险品化学品经营许可证（带存储）