Nanoscale
·
2024
·Vol. 16
·期 46
·21594-21603
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IF 5.8
Yuliang Guo,Wenshu Tai,Mingyu Zhao,Xiao Chen,Yuchao Chai,Guangjun Wu,Landong Li
Self-pillared pentasil (SPP) zeolites have received considerable interest due to their distinctive intergrowth structure, while the precise process and mechanism for the formation of SPP zeolites remain obscure. Herein, SPP zeolites (ZSM-5) have been successfully synthesized by pre-aging an Al-rich gel without employing any organic templates or seeds for the first time. The as-synthesized SPP zeolites possess a notably high external surface area while the micropores for Ar adsorption are partially blocked by excess Na+, which can be fully recovered by Mg2+ or H+ exchange. The crystallization process is monitored and the impacts of synthesis parameters are investigated. The results show that self-pillaring originates from the partial lattice distortion at the intersections of nanosheets, offering a new insight into the self-pillaring process. Typically, with decreasing SiO2/Al2O3 ratio, more crossovers could be observed in the crystals, hinting that self-pillaring predominately occurs at the (101) plane of twins in the ZSM-5 precursor due to Al-rich lattice distortion. Finally, in the catalytic cracking of n-heptane, H-SPP zeolites exhibit superior performance to commercial H-ZSM-5 zeolites due to their abundant Brønsted acid sites arising from a low framework SiO2/Al2O3 ratio of ∼21 and the short diffusion path originating from the house-of-cards structure.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Jiayi Tian,Peng Liu,Yahao Zhao,Wei Zheng,Gen Li,Changchun Han,Wen Liu,Qing Li,Zhijie Den,Xinguo Ma,Furong Ye,Yizhong Huang
Vanadium dioxide (VO2) is a promising material for smart windows due to its metal–insulator transition that enables dynamic solar transmittance modulation. In this study, VO2 (M) nanoparticles were synthesized using a novel approach involving the self-supported structure of V4C3 MXene derived from V4AlC3. Through selective etching, solvothermal oxidation and annealing, VO2 (M) nanoparticles with enhanced thermochromic properties were produced. The self-supported structure of V4C3 MXene significantly reduced particle agglomeration and improved crystallinity, resulting in VO2 (M) films with a luminous transmittance (Tlum) of up to 58.3% and a solar modulation ability (ΔTsol) of 6.3%. The study also demonstrated that film thickness and hydrogen peroxide concentration critically influence optical and thermochromic performance. This study provides a new approach for the preparation of MXene-based VO2 thermochromic smart window materials and is expected to promote their application in the field of building energy conservation.
研究领域:
材料科学
·
能源与建筑节能
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DOI
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 4
·650
·
IF 4.034
Xing Li,Yongshun Bai,Mingshan Wang,Guoliang Wang,Yan Ma,Yun Huang,Jianming Zheng
Silicon is the one of the most promising anode material alternatives for next-generation lithium-ion batteries. However, the low electronic conductivity, unstable formation of solid electrolyte interphase, and the extremely high volume expansion (up to 300%) which results in pulverization of Si and rapid fading of its capacity have been identified as primary reasons for hindering its application. In this work, we put forward to introduce dual carbonaceous materials synergetic protection to overcome the drawbacks of the silicon anode. The silicon nanoparticle was coated by pyrolysed carbon, and meanwhile anchored on the surface of reduced graphene oxide, to form a self-standing film composite (C@Si/rGO). The C@Si/rGO film electrode displays high flexibility and an ordered porous structure, which could not only buffer the Si nanoparticle expansion during lithiation/delithiation processes, but also provides the channels for fast electron transfer and lithium ion transport. Therefore, the self-standing C@Si/rGO film electrode shows a high reversible capacity of 1002 mAh g−1over 100 cycles and exhibits much better rate capability, validating it as a promising anode for constructing high performance lithium-ion batteries.Keywords:silicon;carbon coating;reduced graphene oxide;self-standing film;anode
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Long Zou,Yan Qiao,Shuang Gu,Yunhong Huang,Canyu Zhong,Zhong-er Long
The development of low-cost, scalable and realistic electrodes with robust catalytic activity and stability remains a great challenge for large-scale hydrogen production from electrochemical water splitting. Herein, we firstly reported a 3D self-supported porous hydrogen evolution cathode constructed by in-situ growth of nano-porous molybdenum carbide (Mo 2 C) nanoflakes on a commercial graphite felt (GF) through a facile electrostatic self-assembly followed by high-temperature carburization approach. Owing to a synergistic effect from high activity of nano-porous Mo 2 C and rich macroporous architecture of GF for fast diffusion of electrolyte and generated hydrogen bubbles, the 3D Mo 2 C@GF hybrid electrode only needs a low overpotential of 124 and 129 mV to deliver a cathodic current density of 10 mA cm −2 in 0.5 M H 2 SO 4 and 1 M KOH solution, respectively. Particularly, the strong incorporation of nano-Mo 2 C onto graphite fibers promotes interfacial electron transfer and enables superior stability and durability in both acidic and basic electrolyte. This work provides a proof of concept and design rules for developing truly workable electrodes with promising potential in practical hydrogen evolution.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Energies
·
2022
·Vol. 15
·期 22
·8737
·
IF 3.252
Yixin Chen,Yu Sang,Jianchun Guo,Jian Yang,Weihua Chen,Fei Liu,Ji Zeng,Botao Tang
Hydraulic fracturing is an important technology for the stimulation of oil and gas reservoirs. Conventional fracturing technology based on “sand-carrying” faces some challenges such as sand plugs; incompatibility with the well completion method; damage to the reservoir caused by the incomplete gel-breaking of the fracturing fluid; solid proppants inefficiently turning the corner in complex fracture networks, and so on. In this paper, a novel self-generated proppant fracturing fluid system is proposed to solve the above problems caused by “sand-carrying”. The advantage of the fracturing fluid system is that in the whole process of fracturing, no solid proppants will be injected. The fracturing fluid itself will transform into solid proppants in the induced fractures under high temperatures to resist fracture closure stress. The fluid system consists of two kinds of liquids. One is the phase change liquid (PCL), which occurs as a liquid–solid phase change at high-formation temperatures to form a solid proppant. The other is the non-phase change liquid (NPCL), which controls the dispersity of the PCL in the two-phase fluid system. The main building block of the PCL is confirmed to be the bisphenol-A diglycidyl ether-type epoxy resin, whereas the NPCL is mainly composed of surfactants. The viscosity, phase-change temperature, and time of the fracturing fluid system are, respectively, about 30 mPa·s, 80 °C, and 20 min.Keywords:hydraulic fracturing;fracturing fluid;proppants;self-propping;conductivity
研究领域:
石油工程
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yu Jiang,Rong Yang,Chaojiang Fan,Xin Dong,Hongyu Shang,Lei Mao,Bailing Jiang,Yinglin Yan
As one of the most important prerequisites for the practical application of lithium-sulfur (Li-S) batteries, the efficient utilization of active materials still meets the challenge to activate the dissolved polysulfide between the cathode side and the separator. The MXene has metallic centers and rich surface functions to anchor polysulfides, which prevent the shuttle of polysulfides, is widely used in Li-S batteries. However, the self-stacking defects of MXene hinder its chemisorption and catalytic of polysulfides. Here, a plain, scalable additive plug-in scheme was designed for MXene, and the self-supporting film obtained by dual-intercalation supplied an interlayer for Li-S batteries. The macromolecular cetyltrimethylammonium bromide is used to open the layer distance of MXene and expose the catalytic sites, and the nanometer carbon nanotubes are employed as the second insertion to distribute the conductive carbon networks on the MXene nanosheets to physically confine the polysulfides. The functional interlayer carries adsorption and catalytic activities toward polysulfides conversion. Therefore, the Li-S batteries with the interlayer had an initial discharge specific capacity of 1491.8 mA h g −1 at 0.1 C, and an ultra-low-capacity decay of 0.038% per cycle after 500 cycles at 1 C. This work provides an effective strategy on MXene to construct functional intermediate layer for Li-S batteries to hinder the shuttling effect and catalyze the redox conversion of the polysulfides.
研究领域:
材料科学
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能源存储技术
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产品关联
DOI
高影响因子
Nano Research
·
2020
·Vol. 13
·期 11
·2950-2957
·
IF 8.183
Qin Rong,Hou Jiagang,Xu Caixia,Yang Hongxiao,Zhou Qiuxia,Chen Zizhong,Liu Hong
Electrocatalytic water splitting via hydrogen evolution reaction (HER) represents one of promising strategies to gain hydrogen energy. In current work, self-supporting Co 0.85 Se nanosheets network anchored on Co plate (Co 0.85 Se NSs@Co) is fabricated by employing easily tailorable Co metal plate as the source conductive substrate. The scalable dealloying and hydrothermal selenization strategy was employed to build one layer of three dimensional interlinking Co 0.85 Se nanosheets network on the surface of Co plate. Benefiting from bulky integrated architecture and rich active sites, the as-made Co 0.85 Se NSs@Co exhibits superior electrocatalytic activity and long-term catalytic durability toward HER. It only requires lower overpotentials of 121 and 162 mV to drive the current density of 10 mA·cm −2 for hydrogen evolution in 0.5 M H 2 SO 4 and 1 M KOH solution. Especially, no evident activity decay occurs upon 1,500 cycles or continuous test for 20 h at 10 mA·cm −2 in both acidic and alkaline electrolytes. With the merits of exceptional performances, scalable production, and low cost, the self-supporting Co 0.85 Se NSs@Co holds prospective application potential as stable and binder-free electrocatalysts for hydrogen generation in a wide range of electrolyte.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
GREEN CHEMISTRY
·
2024
·Vol. 26
·期 10
·5940-5953
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IF 9.3
Yongqiang Qian,Lei Tan,Wentao He,Liling Liao,Yongjia Wu,Yiyang Chen,Dan Li,Xu Zhang,Guxia Wang,Yen Wei,Shengwei Guo
Incorporating support structures into solid–liquid phase change materials (SLPCMs) addresses fluid dynamics challenges during phase transitions, albeit at the cost of reduced phase change enthalpy. We propose a novel approach for developing self-sustaining, porous phase change materials. This process begins with the fabrication of self-sustaining poly(acrylic acid) octadecyl ester aerogels through cross-linking polymerization and thermally induced phase separation (TIPS) followed by ambient drying to shape the aerogel. This aerogel demonstrates exceptional energy storage capacity, impressive room-temperature elasticity, and significant load-bearing strength. Leveraging this aerogel as a scaffold, we employ a ‘one-step’ technique to produce phase change gels (PCGs). This method, in which EI functions both as a solvent and as SLPCMs, yields PCGs with a high latent heat capacity of 192 J g−1, outstanding phase change elasticity, and structural stability, proving highly effective in photoelectric thermal management. Notably, the ‘one-step’ process for fabricating self-supporting PCGs circumvents conventional steps like solvent extraction and phase change material absorption in traditional porous foam production. This simplification streamlines manufacturing and facilitates the large-scale production of phase change materials that are morphologically stable, possess high latent heat, and exhibit superior mechanical properties.
研究领域:
材料科学
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能源工程
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光伏技术
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 40
·23188-23198
·
IF 12.732
Xupo Liu,Xuyun Guo,Mingxing Gong,Tonghui Zhao,Jian Zhang,Ye Zhu,Deli Wang
Exploring cost-effective electrodes operating at a high current density above 400 mA cm−2 is still challenging for the industrial application of water splitting. Herein, the corrosion layers of iron foam are tailored towards preparing self-supporting electrodes for the oxygen evolution reaction (OER). Corrosion reactants (Ni2+, O2 and H2O) are adopted to regulate the structures and electrochemical performances of electrodes on account of the diverse iron corrosion behaviors. By further comparing the spontaneous iron corrosion in ZnCl2, CoCl2, NiCl2 and FeCl3 solutions, it is identified that the appropriate electrode potentials of Ni/Ni2+ and Co/Co2+ are favourable for achieving uniformly ordered corrosion layers owing to the simultaneously occurring oxygen corrosion and replacement reaction. The as-prepared electrode exhibits excellent OER performances of affording low overpotentials of 221 and 291 mV to reach 100 and 500 mA cm−2, respectively, as well as steadily operating at 500 mA cm−2 for 100 h. Integrating with a prominent hydrogen evolution reaction (HER) catalyst, an industrially required current density of 500 mA cm−2 has been obtained at 1.81 V. Importantly, a large-area electrode (8 × 8 cm2) has been successfully prepared. This work establishes potential possibilities for designing inexpensive and efficient electrocatalysts through regulated metal corrosion.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2021
·Vol. 38
·期 1
·200-208
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IF 1.307
Wang Yue,Wang Xiaoxue,She Ping,Guan Dehui,Song Lina,Xu Jijing
D esign and fabrication of functional porous air cathode materials with superior catalytic activity is still the key point for non-aqueous lithium-oxygen(Li-O 2 ) batteries. Herein, inspired by the self-standing three-dimensional(3D) structure of the natural spinach leaves, a unique binder-free and self-standing porous Au/spinach cathode for high-performance Li-O 2 batteries has been developed. The carbonized spinach leaves serve as a superconductive current collector and an ideal porous host for accommodating catalysts. The Au/spinach cathode could offer enough spaces for accommodating the discharge products, shorten the distance of the oxygen and electrolyte diffusion, and promote the oxygen reduction reaction(ORR) and oxygen evolution reaction (OER) processes. This optimized Au/spinach cathode achieved a high specific area capacity of 7.23 mA·h/cm 2 at a current density of 0.05 mA/cm 2 and exhibited excellent stability(280 cycles at 0.05 mA/cm 2 with a fixed capacity of 0.2 mA·h/cm 2 ). The superior performance encourages the construction of more advanced cathode architectures by the use of bio-composites for Li-O 2 batteries.
研究领域:
材料科学
·
能源存储
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Junying Huang,Mengting Chen,Tao Tang,Weipeng Liu,Yingju Liu
The self-supporting catalytic electrode is useful in the industry, since it can reduce the complex pre-treatment of catalytic materials and avoid the use of binders. In this work, a ternary self-supporting electrode including Cu mesh-supported graphene and molybdenum disulfide (MoS 2 ) was prepared by electroplating zinc and hydrothermal reaction . Due to the excellent conductivity of copper and the hydrogen evolution catalytic ability of MoS 2 , this self-supporting electrode showed a low Tafel slope as 54 mV dec −1 and a current density of 400 mA cm −2 at an overpotential of -300 mV in hydrogen evolution reaction (HER). In addition, due to the metal flexibility of the Cu mesh substrate, the MoS 2 –rGO Cu ternary self-supporting electrode can be bent or cut into any desired shape. Even shaped as an elongated one, curved "S", this self-supporting electrode still kept itself from any deformation when hydrogen bubbles were rapidly generated. Therefore, a strategy for green, simple, and low-cost self-supporting electrode was provided, which may increase the large-scale operation of the catalytic electrode in HER.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Shouzhi Yan,Dongdong Shen,Md All Amin Newton,Suiyuan Zhu,Binjie Xin
Self-supported nanofiber membranes were fabricated by the rhombus-patterned collector in the electrospinning process in this work. The rhombus nanofiber networks were used to retain the mechanical flexibility of the device and stable responses such as bending and winding deformation. A resistive humidity sensor was developed by applying hydrophilic PANI with varying contents onto nanofiber surfaces through in situ polymerization, serving as electrodes. In this context, the self-supported membranes serve dual roles as both the sensing material and the substrate for the sensor. A comprehensive assessment was conducted to analyze how variations in relative humidity affect the sensing characteristics of the acquired sensors. By facilely regulating the ratio of dopant and oxidant concentration to monomer concentration in the polymerization process, the response of the sensors was increased from 49% to 83% with increasing relative humidity from 13% to 93%, good linearity (R 2 = 0.97) and a short response/recovery times (33/88 s). The prepared sensors exhibited appreciable mechanical properties and showed outstanding stability after 1000 cycles of bending and the resistances only slightly increased by 2.5%. Moreover, the sensor can monitor both human respiration and non-contact skin humidity. Its exceptional performance makes it easily integrable into textiles for the creation of wearable electronics.
研究领域:
材料科学
·
传感器技术
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）