SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Yinghao Jia,Xin Hu,Hengjie Huang,Yangcan Deng,Wenning Cao,Ying Zhou,Xinghui Hou
CS- x ( x = 1, 2, 4, 6) nanoparticles have been successfully prepared by simple hydrothermal method combined with calcination process, and the calcination time is adjusted to optimize micro-structure characterization for their enhanced NO-sensing. The techniques of XRD, Raman, SEM, TEM, TGA, DSC, BET, and XPS are used to study their phase structure, micro-morphology, thermal decomposition process and surface states, then the possible gas-sensitive mechanism is analyzed. Results show that the typical CS-2 sensor has the maximum response of 130–50 ppm NO at 90 ℃, the short response/recovery time of 40/45 s, and the low detection limit of 0.1 ppm (1.18). It also has the reliable NO selectivity against to other interfering gases, good repeatability and high stability. Its enhanced NO-sensing performance may be due to the optimization of pore structure by adjusting the calcination process based on particles adhesion and mass transfer, which increases the pore size and specific surface area that could provide the channel and active sites for gas diffusion and adsorption, thus further promoting the gas-sensing reaction. The experimental methods and ideas of pore structure regulation provide a new way for the design of high-performance sensitive materials.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Hainan Pei,Ru Wang,Ying Li,Yunfei Xue,Yaxin Chen,Jiangmin Jiang,Xiangkai Kong,Quanchao Zhuang,Zhicheng Ju
Designing the closed-pore structure of hard carbon to improve its low-voltage sodium storage capacity is both significant and challenging for the development of high-performance sodium-ion batteries. We utilized a briquetting process combined with a templating method to modulate the pore architecture. By adjusting the briquette pressure, we can regulate the degree of magnesium ion etching and the degree of cross-linking in the precursor, thereby augmenting the closed-pore content of hard carbon and boosting its sodium-storage performance at low potential. During the pre-carbonization stage, magnesium ions etched the surrounding carbon layers, generating large open pores. Experimental results demonstrated that at 3 MPa, the HC-3 anode exhibited a reversible capacity of 366 mA h g −1 at 20 mA g −1 , with a capacity of 224 mA h g −1 below 0.1 V. This study provides valuable insights into optimizing the pore structure of coal-based hard carbon anodes and enhancing low-potential sodium storage.
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 Energy Storage
·
2021
·
IF 6.583
Meng Wu,Sheng Xu,Xiang Li,Tingkai Zhang,Zongze Lv,Zhiguo Li,Xiaoli Li
Realizing the pore structure regulation in biomass porous carbon electrodes has played a key role in improving the performance of supercapacitors. In this work, a facile strategy was proposed to regulate the pore structure by enriching mesoporous prepolymers in the waste wood with intrinsically uncontrollable morphology. As a result, the volume of mesopores effectively increased from 0.11 to 0.48 cm 3 g −1 , and the range for pore size was also expanded to 2-12 nm, which facilitated the fast ion migration of aqueous electrolytes. Under the premises of the similar carbon loading the obtained wooden porous carbon displayed excellent specific capacitance of 323 F g −1 at a current density of 0.5 A g −1 , which was superior to that of carbon electrode sourced directly from waste wood and most other biomass carbons. Meanwhile, the symmetric supercapacitors assembled by the P-MC exhibited a good energy density of 9.62 Wh/kg at a power density of 47.2 W/kg and outstanding cycling stability (98.2% capacitance retention after 10000 charge/discharge cycles at 2 A g −1 ) in 6 M KOH electrolytes. This work proved a new strategy to value-added utilization for waste wood, which expanded its application in supercapacitors, and turned the waste into treasures.
研究领域:
材料科学
·
能源存储
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Yahui Xu,Hanbo Wang,Zikai Wang,Yan Wang,Dongyu Zhu,Ziming Wang,Kechang Li,Yumei Tian,Haiyan Lu
Hollow carbon spheres (HCSs) attracted increasing attention in the field of supercapacitor materials owing to their unique hollow structure. However, their hollow shells exhibited weak mechanical strength and tended to collapse under high-rate cycling. In this study, a nitrogen/sulfur co-doped hollow carbon sphere (NS-HCS) with tunable shell thickness was synthesized by adjusting the shell thickness and dopant loading. The optimized NS-HCS-1 integrated double-layer and pseudocapacitive storage while retaining the intrinsic high-power characteristics of carbon materials. The appropriate shell thickness enhanced structural durability, whereas N and S doping enriched the pore structure, accelerated ion transport, and provided additional pseudocapacitance, thereby improving electrochemical performance. In a three-electrode system, the material delivered a specific capacitance of 366 F g −1 at 1 A g −1 and retained 98.42 % of its initial capacitance after 20,000 cycles at 15 A g −1 . The assembled symmetric cell achieved a maximum energy density of 34.08 Wh kg −1 and a power density of 570 W kg −1 . This synergistic engineering of shell thickness and heteroatom doping afforded outstanding electrochemical performance, rendering NS-HCS-1 a promising electrode candidate for next-generation supercapacitors.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
功能材料
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2023
·
IF 10.9
Yuan Shu,Tingkai Zhao,Xianghong Li,abdul Jalil,Lei Yang,Guyue Feng,Yatao Li,Weiyu Jia,Fa Luo
To optimize the electromagnetic wave performance for absorbers, it is crucial to implement rational structural designs and integrate multiple loss modes in a coordinated manner. Here, three-dimensional (3D) porous macroscopic coral-like Co/CoO/reduced graphene oxide aerogels (Co/CoO/RGO), are successfully fabricated by an ice-templated freeze-drying and thermal reduction techniques, and their pore structures , involving aperture and total pore volume , are availably regulated by manipulating the water addition. The electromagnetic parameters and electromagnetic wave performance appear strong response toward the variation of pore structure. By controlling the pore structure, these parameters can be efficaciously tunned, thus manipulating the performance. The optimized absorption performance is obtained when the water addition is 1 ml, the minimum reflection loss reaches to −61.8 dB and the effective bandwidth is 4.2 GHz. Such good performance is inseparable with the 3D crosslinked conductive framework, the hybrid of magnetic and dielectric units, numerous heterointerfaces and countless pores walls in aerogels, which brings multiple electromagnetic wave loss mechanism. Moreover, it is very important that Co/CoO/RGO aerogels also integrate good hydrophobicity and heat insulation properties, allowing their application in harsh conditions. This work shows the potential of pore structural control engineering for producing multifunctional aerogels.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2021
·Vol. 8
·期 23
·2101266
·
IF 6.147
Zhong Dai,Peng-Gang Ren,Zhengyan Chen,Zhengzheng Guo,Xin Hou,Wenwei He,Yanling Jin,Fang Ren
The porous structure and heteroatom doping are crucial for the electrochemical performance of carbon materials for supercapacitors. However, designing carbon materials with appropriate pore sizes and heteroatom content is still facing daunting challenges. Herein, simultaneous regulation of porous structure and heteroatom doping in superabsorbent resin (SAR)-based activated carbon aerogels (SACAs) is implemented by facilely immersing superabsorbent resin in methylene blue (MB) solution with different concentrations, and then followed by freeze-drying and carbonization. The resulting SACAs possess variable oxygen/nitrogen/sulfur elements, adjustable high specific surface area, abundant micro–mesopores, and controllable porous structure. Hence, the assembled symmetric supercapacitors exhibit an excellent rate capacity of 83%, a superior energy density of 24.58 Wh kg −1 at the power density of 400 W kg −1 , as well as a satisfactory energy density of 20.84 Wh kg −1 at the power density of 4000 W kg −1 . Furthermore, outstanding cycling stability (94.59% retention) and high Coulombic efficiency (average value over 97%) are achieved for the supercapacitors after 10 000 cycles. This work broadens a new avenue to design the appropriate pore structure and heteroatom doping of carbon materials for high-performance supercapacitors.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2013
·
IF 3.365
Sen Lin,Lei Shi,Hongpeng Zhang,Na Zhang,Xianfeng Yi,Anmin Zheng,Xuebing Li
Al-SBA-15 containing plug structures inside straight channels have been hydrothermally synthesized through a one-step synthesis strategy in an environmentally friendly acid-free medium. The effects of steaming, alkali, and acid post-treatments on the structural properties were investigated by powder X-ray diffraction (XRD), nitrogen adsorption–desorption at 77 K, transmission electron microscopy (TEM), scanning electron microscopy (SEM), FT-IR spectrum, 27 Al MAS NMR, and inductively coupled plasma (ICP) analyses. The presence of the plugs can significantly enhance structural stability against steaming or alkali post-treatments. Acid post-treatment can be a very simple and convenient technique for adjusting the textural properties of plug-containing Al-SBA-15, and especially for optimizing the accessibility to active sites. Acid post-treatment at the low temperatures of 313 and 323 K results in the formation of a larger specific surface area (905 m 2 /g) and pore volume (0.94 cm 3 /g) through an “open door” effect in the plugs, without eliminating any of the plugs from the channels. In particular, nearly half of the secondary micropores on the pore walls were preserved. In contrast, raising the acid post-treatment temperature further to 333 and 343 K caused a “closed doors” effect through the blockage of pores in the plugs by the extracted fragments. After loading with nickel, the catalyst exhibited a higher yield of C 10+ olefins in ethylene oligomerization , and more importantly, after steaming and acid post-treatments at higher temperatures, the samples showed shape selectivity for the C 16 olefin.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Shuhui Xia,Yuanyuan Zhang,Yun Zhao,Xiao Wang,Jianhua Yan
Porous carbon nanofibers (PCNFs) have rich channels for transporting ions, molecules, and nanoparticles, but the control over their porous structures is a challenge. Here, we report a scalable electrospinning technique by using poly(tetrafluoroethylene) as a pore template, boric acid as a cross-linking agent, and polyvinyl alcohol and polyurethane as dual carbon precursors to fabricate flexible PCNFs with tunable geometries and macro/meso/microporous structures. In the water solvent, the negatively charged template cross-links with the positively charged carbon precursors to form a stable sol for electrospinning. By varying the mass ratios of these precursors, the electrospun hybrid nanofibers are directly transformed into B–F–N–O doped PCNFs with tunable macro-, meso-, and micropores after carbonization. The porosity of an individual PCNF is as high as ∼85%, and the pore volume can be tuned from 0.23 to 0.58 cm3·g–1. When constructing high-sulfur-content (86 wt %) electrodes with the freestanding PCNF films, the porous structures with rich electroactive sites provide rapid pathways for poly-anions and have strong chemisorption of poly-sulfides, leading to a great electrochemical performance. The reported strategy offers a new perspective for synthesizing hierarchical PCNFs with appealing applications.
研究领域:
材料科学
·
纳米科技
·
能源材料
·
电化学
·
功能高分子
·
碳材料
✓ 已验证
DOI
高影响因子
MATERIALS & DESIGN
·
2019
·
IF 5.77
Tingting Cheng,Siqi Li,Lan Xu,Adnan Ahmed
A modified electrospinning (MES), which consists of a copper mesh collector and an air pump placed behind it, was presented to fabricate nanofiber membranes (NFMs) with controllable large pore sizes by adjusting the MES parameters, such as copper mesh size, air velocity, applied voltage, flow rate and collecting distance. The controllable preparation mechanism of NFMs with large pore sizes was systematically investigated by experimental research and theoretical analysis. And the effects of the copper mesh grid dimensions, air velocity, applied voltage, flow rate and collecting distance on the pore sizes of NFMs were demonstrated. The results showed that NFMs with large pores produced successfully by the MES, and the pore sizes were all micrometer scale. And the optimal average pore size reached 14.45 μm 2 at the grid size of copper mesh of 4 mm×4 mm, the air velocity of 5 m/s, the applied voltage of 12 kV, the flow rate of 1.0 mL/h and the collecting distance of 18 cm.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
·
组织工程
·
过滤材料
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Feng Ye,Shuanshi Fan,Xuemei Lang,Yanhong Wang,Gang Li
Silicalite-1 zeolite membranes were successfully activated at 300–350 °C in a hydrogen atmosphere. FTIR, TGA, and N 2 adsorption-desorption characterizations confirmed that the amount of the organic structure directing agent (OSDA) residue in silicalite-1 zeolite channels was tunable. The H 2 -calcined membrane showed a lower gas permeance than that of the air-calcined membrane due to the partial pore blockage by the OSDA residue. The permeance of H 2 and CO 2 increased with increasing temperature, showing an activated diffusion-like mechanism. The activation energies for the permeation of H 2 and CO 2 were in the range of 1.63–4.15 and 0.76–5.90 kJ mol −1 , respectively, which confirmed the reduced average membrane pore size and different pore surface chemistry due to the presence of the OSDA residue in the membrane. Significant interactions between CO 2 molecules and OSDA residues confined in the membrane resulted in a notably lower CO 2 permeance compared to N 2 and CH 4 , despite CO 2 having a smaller kinetic diameter. Enhanced H 2 /CO 2 selectivity in the silicalite-1 zeolite membrane, featuring confined OSDA residue, was attributed to the reduction in membrane pore size and the fine-tuning of pore surface chemistry.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Yuyue Peng,Jinsheng Yu,Xianhao Liu,Timur Meng,Xiaohui Zhao,Lina Li
The specific regulation of pore structure in porous aromatic framework (PAF) materials is of paramount importance for achieving exceptional performance. In this study, we propose a novel approach by utilizing the two-dimensional layered mineral, montmorillonite , as a template for the synthesis of PAF-Mt. Through a meticulously designed hydrothermal method , the residual template is completely eliminated, resulting in the creation of a new porous aromatic framework material, termed PAF-Mt-Free. Our research findings demonstrate remarkable improvements in the morphology, surface area, and pore size of PAF-Mt-Free compared to classical PAFs. Specifically, the morphology of PAF-Mt-Free undergoes a transformation from spherical to smaller fragmented particles. The specific surface area （968.163 m 2 /g） is enhanced by 47.9% compared to PAF-Mt（654.784 m 2 /g） and by 68.3% compared to PAF-45（575.390 m 2 /g）. Moreover, the main pore size of PAF-Mt-Free increases from approximately 0.5 nm to 0.9 nm. Importantly, PAF-Mt-Free not only maintains the excellent photocatalytic performance of PAF-Mt but also exhibits significantly enhanced adsorption capacity, particularly for organic molecules with a size smaller than 1 nm. Notably, the adsorption efficiency for benzene, toluene, chlorobenzene , and bromobenzene increases by 10%, 18.4%, 11%, and 13.2%, respectively. These findings highlight the promising potential of utilizing montmorillonite templating for the precise control of pore structure in PAF materials, leading to enhanced adsorption performance. Our study contributes to the advancement of porous aromatic framework materials and their applications in various fields.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Ningjie Lv,Mengde Li,Xiangbin Chen,Ning Qi,Zhiquan Chen
In this work, a series of Ni/Co-MOFs with high specific capacitances were synthesized as anode materials using a one-step hydrothermal reaction method. NaOH in different amounts (3, 4, 5, and 6 mmol) was added during the synthesis to tune the pore structure of Ni/Co-MOFs. It was found that the Ni/Co-MOF-3 with a NaOH amount of 5 mmol exhibits the largest specific surface area and pore volume, which provides more active sites for the electrochemical reaction and facilitates ion diffusion at the interface of the electrolyte solution/active material, thus increasing the capacitance of the electrode material. The electrochemical test results show that the specific capacitance of Ni/Co-MOF-3 reaches 1361 F g–1 at 1 A g–1. Impressively, the specific capacitance is still as high as 1214 F g–1 when the current density increases from 1 to 20 A g–1, with a high capacitance retention rate of about 89.2%. In addition, Ni/Co-MOF-3 and activated carbon were used as positive and negative materials, respectively, to assemble an asymmetric capacitor, which has a specific capacitance of 134.4 F g–1 at 1 A g–1 and an energy density of 47.69 Wh kg–1 at a power density of 800 W kg–1. The specific capacitance is 60% of the initial specific capacitance at 5 A g–1 after 10,000 cycles. At the same time, two such asymmetric capacitors can light up the red LED indicator for more than 30 min after being connected in series with a full charge, indicating that they have outstanding application potential.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）