Journal of Energy Chemistry
·
2020
·
IF 7.216
Wen-Bei Yu,Wen-Da Dong,Chao-Fan Li,Nasiruddin Macadam,Jiu-Xiang Yang,Guo-Bin Zhang,Zhi-Yi Hu,Tien-Chun Wu,Yu Li,Tawfique Hasan,Li-Hua Chen,Li-Qiang Mai,Bao-Lian Su
Supercapacitor-like Na-ion batteries have attracted much attention due to the high energy density of batteries and power density of capacitors. Titanium dioxide (TiO 2 ), is a promising anode material. Its performance is however seriously hindered by its low electrical conductivity and the sluggish diffusion of sodium ions (Na + ) in the TiO 2 matrix. Herein, this work combines porous TiO 2 nanocubes with carbon nanotubes (CNTs) to enhance the electrical conductivity and accelerate Na + diffusivity for Na-ion batteries (NIBs). In this composite, an interwoven scaffolded TiO 2 /CNTs framework is formed to provide abundant channels and shorter diffusion pathways for electrons and ions. The in-situ X-ray diffraction and cyclic voltammetry confirm the low strain and superior transport kinetics in Na + intercalation/extraction processes. In addition, the chemically bonded TiO 2 /CNTs hybrid provides a more feasible channel for Na + insertion/extraction with a much lower energy barrier. Consequently, the TiO 2 /CNTs composite exhibits excellent electrochemical performance with a capacity of 223.4 mAh g −1 at 1 C and a capacity of 142.8 mAh g −1 at 10 C (3.35 A g −1 ). The work here reveals that the combination of active materials with CNTs can largely improve the utilization efficiency and enhance their sodium storage.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yu Zhang,Rong Li,Qi Guo,Fangxiang Song,Kang Kai,Qianlin Chen
The emergence of the lithium-ion battery as a subject of intense research interest has propelled of high-energy–density LiFe x Mn 1-x PO 4 (LFMP) becoming a prominent area of investigation. However, the material suffers from inherently low electronic conductivity due to its olivine structure, which imposes severe constraints on electron transport kinetics, thus adversely impacting both charge–discharge rates and overall electrochemical performance. We propose an innovative protocol for high-precision reaction mechanism modulation. By employing Fe 3 (PO 4 ) 2 ·8H 2 O with strategically enhanced (020) crystal plane exposure as a pivotal precursor, we synthesized LiFe 0.75 Mn 0.25 PO 4 /C cathode material featuring a shorter ion diffusion path. Comprehensive characterization coupled with electrochemical validation revealed that the resultant cathode material exhibits a smaller particle size and more uniform morphology, along with a superior rate performance and cycle stability. The discharge specific capacity is 144.1 mAh g −1 and the capacity retention reaches 96.1 % over 1000 cycles at a 1C rate. The findings demonstrate that the regulation of the growth trajectory of the precursor Fe 3 (PO 4 ) 2 ·8H 2 O crystal plane can markedly enhance the electronic conductivity and Li + mobility of the cathode material, thereby optimising the electrochemical performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Xuefeng Zhang,Haiqin Lin,Huaqing Peng,Wenrui Li,Ting Wang,Jianpeng Li,Qiancheng Xiong,Yong Liu,Xudong Liu
MXenes have immense potential in electrochemical energy storage owing to their outstanding physicochemical properties such as their oxygen-containing groups that impart additional pseudocapacitance to acidic electrolytes. However, during electrode assembly, MXene nanosheets undergo restacking because of hydrogen bonding and van der Waals forces, which causes electrolyte ions to traverse long diffusion pathways between the long and narrow nanosheets. Exploiting the oxidative properties of Ti 3 C 2 T x , a hierarchical porous MXene film with micro-, meso - and macroporous structures was successfully prepared using a simple hydrothermal oxidation and etching process to create micro- and mesoporous structures, followed by ice templating to prepare three-dimensional (3D) linked macroporous structures. Because these hierarchical pores have synergistic effects on electrochemical activity and electrolyte ion diffusion, the film attained a specific capacitance of 539F/g at a current density of 2 A/g when it was used as a supercapacitor electrode, which corresponds to one of the highest values reported for MXene-based electrodes. The film retained 83% of its specific capacitance when the current density was increased to 40 A/g, and exhibited excellent cycling stability. By using this multi-porous MXene design, synergistic improvement in ion diffusion was successfully realized and thus a new strategy to prepare high-performance supercapacitor electrode materials was developed.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
ACS Nano
·
2025
·
IF 16
Zhizheng Sheng,Jian Zhou,Yangdong Wang,Wenhua Fu,Ke Du,Weihua Wang,Kaiqi Nie,Jianqi Hao,Yahong Zhang,Binhang Yan,Wei Fan,Jiawei Teng,Zaiku Xie
Controlling diffusion and elementary reaction pathways to achieve high selectivity and stability has been a long-standing challenge in heterogeneous catalysis. Here, we develop a “gear-catalyst” system that spatially and kinetically decouples the methanol-to-aromatics (MTA) reaction into two sequential steps: methanol-to-olefins and olefins-to-aromatics. We show that nanoZSM-5 (high Si/Al ratio, ∼100 nm particle size) serves as a highly efficient smaller “gear” for rapid olefin generation and accelerated mass transfer, while micrometer-sized Zn-exchanged ZSM-5 (Zn/Z5) acts as the larger “gear” to promote aromatization. This gear-like synergy enables precise control of both reaction kinetics and diffusion pathways, reducing undesired overalkylation and coke formation. Consequently, our catalyst delivers a remarkable increase in aromatic yield with an 85% selectivity for benzene, toluene, and xylene in a single pass. In situ spectroscopic studies reveal that the smaller nanoZSM-5 particles modulate local olefin concentrations and prevent early aromatic buildup, thereby extending catalyst lifetimes by suppressing hard-coke formation. The resulting “two-center” mechanism, in which olefins shuttle between adjacent acid and metal sites, demonstrates how a simple physical mixing strategy can decouple complex multistep pathways. Our findings underscore the potential of gear-catalysis concepts to tackle similar diffusion-reaction mismatches in high-value chemical transformations, from syngas-to-aromatics to CO2-based fuel synthesis.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2023
·
IF 13.1
Kaiyong Tuo,Fusheng Yin,Fanghui Mi,Chunwen Sun
All-solid-state batteries (ASSBs) with inorganic solid-state-electrolytes (SSEs) have been regarded as the promising candidate for next-generation energy storage due to their high energy density and outstanding safety performance. However, the representative oxide and sulfide electrolytes suffer from low ionic conductivity and poor (electro)chemical stability, respectively. Herein, we report a series of new halide superionic conductors Li 2+ x Hf 1− x In x Cl 6 with high ionic conductivity up to 1.05 mS cm −1 at 30 °C that are simultaneously stable to high voltage. By means of the characterization techniques and bond-valence site energy (BVSE) calculation, insights into the effect of the phase transformation and underlying ionic transport mechanism by In substitution for Hf in Li 2 HfCl 6 are provided. Importantly, with the increased amount of aliovalent substitution in Li 2+ x Hf 1− x In x Cl 6 microcrystal framework, a gradual structure evolution from trigonal to monoclinic phase has been observed, which is accompanied by the redistribution of Li-ions to generate two dimensionally (2D) preferable diffusion pathways through octahedral-tetrahedral-octahedral sites in In 3+ -substituted Li 2 HfCl 6 . Additionally, due to the oxidative stability of In-substituted Li 2 HfCl 6 , the bulk-type ASSBs with bare LiCoO 2 deliver distinguished electrochemical performance.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 40
·期 7
·6036-6045
·
IF 3.277
Xiaoqin Fu,Xiaoli Sheng,Yuming Zhou,Zhiwei Fu,Shuo Zhao,Zewu Zhang,Yiwei Zhang
Hierarchical zeolites have bridged the gap between conventional zeolite and mesoporous materials, which not only maintain the excellent advantages of microporous sieves, but also effectively resolve the diffusion limitations. Herein, a novel alkoxy-functionalized ionic liquid was employed as a mesoporous structure-directing agent to synthesize hierarchical aluminosilicates with dual micro–mesoporous channels. X-ray diffraction (XRD), N2 adsorption–desorption isotherms (BET), scanning electron microscopy (SEM), transmission electron microscopy (TEM), temperature-programmed desorption (TPD), thermogravimetric analysis (TGA) and 27Al magic-angle spinning nuclear magnetic resonance (27Al MAS NMR) were used to characterize the structural and textural features of the hierarchical aluminosilicates. The results showed that the ionic liquid (MTPI) employed played the role of a mesoporous structure-directing agent which was trapped within the pores of a faujasite structure through –Si–O–Al– and –Si–O–Si– linkages. The mesoporous diameters and structures of the final hierarchical materials could be uniformly tailored by tuning the added amount of template. Hierarchical aluminosilicates with the combined advantages of both mesoporous properties and the microporous crystalline structure of zeolites exhibited high catalytic activity and resistance to deactivation in the alkylation of o-xylene with styrene, as compared to the conventional zeolite with the sole presence of micropores. The distinct catalytic performance of hierarchical aluminosilicates could be attributed to the short diffusion routes and abundant exposed acidic sites on the external surface.
研究领域:
材料化学
·
催化化学
·
纳米多孔材料
·
无机合成
·
物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2013
·
IF 2.39
H. Wang,J. Zhang,J.W. Liu,L.Z. Ouyang,M. Zhu
The addition of NaH by ball milling is shown to greatly improve the hydrogen storage properties and the hydrolysis properties of MgH 2 , which is related to the formation of ternary hydride NaMgH 3 with specific perovskite structure. The MgH 2 –10%NaH mixture exhibits better hydriding and dehydriding kinetics than the MgH 2 –10%LiH mixture, in which the LiMgH 3 with perovskite structure could not be formed. The catalytic role of NaMgH 3 is attributed to fast hydrogen mobility in the perovskite structure, which provides fast hydrogen diffusion pathways for the hydriding and dehydriding of MgH 2 . The NaMgH 3 also shows fast hydrolysis reaction kinetics without any passivation. Our work shows that such perovskite-type hydride demonstrates great potential as efficient catalysts for the high-capacity hydrides for whether reversible or irreversible hydrogen storage.
研究领域:
材料化学
·
无机化学
·
能源材料
·
氢储能
·
固态储氢
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Yanyan Wang,Yu Liu,Jiyang Li,Yuanyuan Liu,Weiqiang Zhang,Mingming Yang,Yajun Jian,Ping Zuo,Ziwei Gao
The position of Pd species in/on zeolites is crucial for the activity of metal/metal oxide catalysts. It is still a challenge to highly disperse and stabilize the metal species on zeolites and shorten diffusion paths to maintain high catalytic activity. Here, we report an effective strategy for preparing highly efficient zeolite-supported Pd(II) catalysts by positioning Pd(II) species on the surface of a zeolite with an anion framework based on the principle of charge balance. The catalyst was prepared in situ in a C–C cross-coupling reaction. Due to the change in the metal–support interaction, Pd species have migrated from the inside to the surface of the zeolite, which shortens the diffusion path of reactants and thus ensures the high activity of the catalyst. Pd species exhibit aggregation resistance in alkaline systems and tend to be confined in the traps with high charge density. Compared to unactivated Pd@USY, the efficiency of the activated catalysts has at least doubled in catalyzing the Sonogashira and Suzuki–Miyaura reactions. This study represents a new activation approach for zeolite-supported Pd catalysts, which may help to design efficient catalysts.
研究领域:
催化化学
·
材料化学
·
有机合成
·
纳米催化
·
多相催化
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Lin-Lin Zhang,Huan-Huan Li,Chao-Ying Fan,Kang Wang,Xing-Long Wu,Hai-Zhu Sun,Hai-Ming Xie,Jing-Ping Zhang
Polypyrrole nanospheres were embedded in graphene layers (rGCP) to successfully form three-dimensional hierarchical cross-linking structure through simple hydrothermal method. The structure of rGCP composite mainly resulted from the synergistic effect of cetyltrimethyl ammonium bromide and crumpled graphene layers, which was beneficial for achieving large surface area, short ion diffusion pathway, excellent rate performance and cycling stability. As a result, the hybrid rGCP composite exhibited excellent electrochemical performance with a specific capacitance of almost 400 F g −1 at the scan rate of 1 mV s −1 . Furthermore, even at the high current density of 10 A g −1 , it still retained the capacitance of 243.2 F g −1 , and excellent cycling stability (91.8% capacitance retention even after 5000 cycles). The as-prepared hierarchical hybrid composite has promising potential in electrochemical energy storage.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
高分子复合材料
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Lei Liu,Zijian Zhou,Ying Liu,Xin Yu,Dunxi Yu,Minghou Xu
The development of efficient non-noble metal catalysts for low-energy, high-safety hydrolysis of ammonia borane (AB) is critical to advancing hydrogen generation technologies. Current catalysts face two main challenges: sluggish diffusion and competitive activation of liquid-phase molecules (H2O and AB) on single metal sites, causing low efficiency. To address these limitations, we adopt two strategies: (1) the fabrication of multi-shell hollow sphere architectures to minimize reactant diffusion pathways and (2) the integration of dual reaction sites to decouple the activation of reactants. This study diverges from trial-and-error experimentation by employing integrated theoretical and experimental methodologies. Theoretical modeling shows that optimal shell thicknesses are below 0.98 and 12.49 µm for AB and H2O, respectively. We selected Zn, Mn, Ni, and Cu from seven common metal oxides as secondary reaction sites for Co3O4 catalysts based on their affinity for reactants. Experiments revealed that the multi-shell structure increased the catalyst's specific surface area from 25 to 98.26 m2 g−1, reducing reactant diffusion distance. Dual reaction sites enabled selective activation of reactants, with activity order Cu > Ni > Mn > Zn for modified Co3O4 catalysts. Enhanced catalytic performance correlates with improved charge localization and electron transfer, lowering H2O and AB dissociation energy barriers by 8-fold and 1.5-fold, respectively. Reactant binding energies align linearly with the catalyst's d-band center, and catalytic activity shows a volcano-shaped correlation with dopant-induced d-band center shifts, consistent with the Sabatier principle. The optimal dopant d-band center is between −1.4 and −1.8 eV. In general, this work offers a design reference for mass transfer and chemical reaction enhancement of AB hydrolysis catalysts.
研究领域:
材料化学
·
催化化学
·
纳米科技
·
能源化学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
Batteries-Basel
·
2025
·Vol. 11
·期 8
·289
·
IF 4.8
Shan-Diao Xu,Li-Cheng Wu,Muhammad Adil,Lin-Feng Sheng,Zi-Yue Zhao,Kui Xu,Xin Chen
To develop high-performance electrode materials for supercapacitors, in this paper, a heterostructured composite material of cerium sulfide and zinc sulfide quantum dots (CeS2/ZnS QD) was successfully prepared by hydrothermal method. Characterization through scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM) showed that ZnS QD nanoparticles were uniformly composited with CeS2, effectively increasing the active sites surface area and shortening the ion diffusion path. Electrochemical tests show that the specific capacitance of this composite material reaches 2054 F/g at a current density of 1 A/g (specific capacity of about 256 mAh/g), significantly outperforming the specific capacitance of pure CeS2787 F/g at 1 A/g (specific capacity 98 mAh/g). The asymmetric supercapacitor (ASC) assembled with CeS2/ZnS QD and activated carbon (AC) retained 84% capacitance after 10,000 charge–discharge cycles. Benefited from the synergistic effect between CeS2and ZnS QDs, the significantly improved electrochemical performance of the composite material suggests a promising strategy for designing rare-earth and QD-based advanced energy storage materials.
研究领域:
材料科学
·
纳米技术
·
电化学
·
储能
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Renna Li,Tianshan Xue,Zhe Li,Qiang Wang
Hydrophobic zeolites have been considered as one of the most promising adsorbents for capturing volatile organic compounds (VOCs). In this contribution, hierarchically structured ZSM-5/SBA-15 composites with different morphologies including platelet, hexagonal prism, long-hexagonal prism, and long-rod were prepared. All materials were characterized using XRD, SEM, and TEM-EDX, which confirmed that the high dispersion of two zeolites within the composites. Due to the presence of intracrystalline mesopores that could shorten the diffusion pathway of toluene, the composites resulted in increased effective diffusion and higher adsorption capacity. The composites also possess higher hydrophobicity, leading to much better toluene adsorption performance under humid conditions. The water contact angle of ZSM-5 could be increased from 15.6° to 44.9° by forming well dispersed zeolite composites. The 29 Si MAS NMR results confirmed that the composites possess higher amount of Q 4 groups (75.3%–80.1%), which is the intrinsic reason for higher hydrophobicity. Notably, ZSM-5/SBA-15-hexagonal prism resulted in the best adsorption performance and cycling stability when compared with pure ZSM-5, the breakthrough time was increased from 20.8 to 49.4 min under dry conditions and from 5.9 to 27.3 min in the presence of 50% relative humidity. This work represents an important scheme for making hydrophobic zeolite-based VOCs adsorbents with also improved toluene diffusion properties due to the unique hierarchical porous structure.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）