SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jinsong Shi,Jianguo Xu,Hongmin Cui,Nanfu Yan,Runhan Yan,Yaqing Weng
Porous carbon is a very promising type of CO 2 adsorbent due to its excellent stability, low cost, and tunable physicochemical properties. In the current work, N-doped hierarchically porous carbon was synthesized with the assistance of NaCl template and KHCO 3 activation. A series of carbons with three dimensional and interconnected micro- meso -macroporous structure were successfully prepared. Effects of synthesis conditions on textural properties and N-doping were analyzed and discussed with details. The carbons also exhibited high surface area (725–2423 m 2 /g) and N content (1.49–7.93 wt%). CO 2 adsorption properties were studied with a combined experimental and theoretical approach. At 25 °C and 1 bar, the carbons exhibited CO 2 uptake up to 4.22 mmol/g and CO 2 /N 2 selectivity up to 25.6. Grand canonical Monte Carlo (GCMC) simulation was employed to further elucidate the different roles played by N-doping and textural properties during CO 2 adsorption. Effects of various N-functionalities located in pores with different sizes on CO 2 adsorption were thus revealed. The present study presents a novel strategy for controlled synthesis of porous carbons, and provides helpful insights into their CO 2 adsorption behaviors.
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
ACS Omega
·
2024
·
IF 3.7
Hongmei Zhong,Ting Meng,Wenxiang Ding,Yi Xiao,Peng Zhang
Passive radiative cooling technology serves as an energy-free alternative to traditional cooling systems. Porous polymer structures are frequently employed for radiative cooling by leveraging the refractive index mismatch between the polymer and the pores, enabling the scattering of incoming sunlight. Recently, water-soluble and readily available Sodium chloride (NaCl) particles have been utilized as sacrificial templates for sustainable pore creation. Nevertheless, optimizing NaCl particle size, and thus the polymer pore size to enhance scattering capabilities remains a challenge. Here, we report a simple, scalable, and sustainable approach to creating an optimized porous polydimethylsiloxane (PDMS) film. This approach utilizes ultrafine NaCl powders as sacrificial templates, which were synthesized via ultrasonic precipitation to ensure their small size. The ultrafine NaCl particles have a size distribution centered around 6–8 μm, and the as-fabricated porous PDMS film achieves a high thermal emissivity of 0.95 within the atmospheric window (8–13 μm) and exhibits a reflectivity of 0.95 within the visible range (0.4–0.78 μm). Due to the desired dual-spectrum properties, the porous PDMS film exhibits a superior subambient cooling capacity over that fabricated with typically larger NaCl particles under strong sunlight. This study offers a scalable and practical radiative cooling solution for sustainable thermal management.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Yuxiang Chen,Zhian Zhang,Yanqing Lai,Xiaodong Shi,Junming Li,Xiaobin Chen,Kai Zhang,Jie Li
3D porous carbons have shown great potential in electrochemical energy storage . However, traditional template assisted methods suffer from complicated synthesis processes as well as the difficulty of removing template. In this paper, 3D neat porous carbon aerogels have been designed and synthesized by a green and novel way via self-assembly of hydrogel with NaCl as the template and the flux during in-situ polymerization and carbonization . NaCl can be easily recovered with simple recrystallization in the end of synthesis. The as-synthesized 3D porous carbon aerogels display excellent structural stability, large specific surface area (1665.5 m 2 g −1 ), porous structure centered at microporous (0.71 nm and 1.24 nm) and macropores for ionic diffusion and electrolyte transport, as well as large interlayer spacings (0.386 nm) for sodium storage. When employed as anode materials for sodium-ions batteries, the electrodes exhibit high reversible specific capacity of 287 mAh g −1 at 50 mA g −1 after 100 cycles, superior cycling stability of 154 mAh g −1 at 500 mA g −1 after 1000 cycles as well as excellent rate capability of 139 mAh g −1 at 1000 mA g −1 . This work inspires a new strategy in the fabrication of advanced carbon structures for sodium-ion batteries and other applications.
研究领域:
材料科学
·
电化学能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Jinsong Shi,Nanfu Yan,Hongmin Cui,Jianguo Xu,Yuewei Liu,Shaowei Zhang
Because of their high stability, low cost, and tunable porosity, porous carbons are of great interest as CO2 adsorbents. The influences of porosity and heteroatom doping on CO2 adsorption depend on the specific adsorption conditions. In the current work, nitrogen and sulfur co-doped carbons were prepared with the assistance of an NaCl template, and the effects of different physicochemical parameters on CO2 adsorption at 20 bar were investigated. The co-doped carbons were synthesized with sodium lignosulfonate as the starting material and urea as the nitrogen source. The material showed a high specific surface area and pore volume of 973 m2/g and 0.50 cm3/g, respectively. Sulfur-doped carbons were also prepared without the addition of urea. Sulfur doping demonstrated positive effects on CO2 adsorption at a low pressure. The sulfur-doped carbons showed adsorption properties similar to those of the co-doped carbons. The CO2 uptake at 298 K and 20 bar was in the range of 4.3–7.5 mmol/g. The experiment results also revealed that the uptake at 20 bar correlated to the specific surface area of the carbon, while the doped heteroatoms only had secondary influences.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2023
·
IF 1.2
Yong Li,Manyu Liu,Mingqing Zhang,Yanfang Liu,Qinghua Zhao,Xin Li,Qianyu Zhou,Yuanfu Chen,Shifeng Wang
Photocatalytic technology is currently the most promising technology for environmental pollution control. The preparation of photocatalysts with excellent properties is the core of the development of photocatalytic technology. TiO 2 can form a heterojunction with g-C 3 N 4 , which can effectively inhibit the recombination of photogenerated electron–hole pairs, improve the mobility of photogenerated carriers, and thus improve the photocatalytic performance. In this study, NaCl was used as a template, and the loose and porous g-C 3 N 4 /TiO 2 heterojunction composite photocatalysts were prepared by the template method. Compared to the pure g-C 3 N 4 prepared by the conventional thermal polycondensation method and TiO 2 , the g-C 3 N 4 /TiO 2 heterojunction composite photocatalysts prepared in this study exhibited a greatly increased specific surface area, an improved light absorption performance, a significantly suppressed recombination of photogenerated electrons and holes. Furthermore, the g-C 3 N 4 /TiO 2 heterojunction composite photocatalysts exhibited excellent photocatalytic performance.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2022
·Vol. 29
·期 1
·183-191
·
IF 2.961
Wang Yang,Liang Xin,Wu Xiaolong,Wang Lulu,Xu Kun,Sun Yi,Wang Jiazhao,Xiang Hongfa
Li–S batteries have been
considered as the most desirable candidate for next-generation batteries because of their high energy density and low cost, although the problems of the insulating nature of S and Li 2 S and the “shuttle effect” of polysulfides in Li–S batteries have to be addressed. In this work, we propose NaCl templates and a solid–liquid coexistence strategy to synthesize an N-doped carbon matrix with interconnected micro-mesoporous structure. Benefiting from the critical state of solid–liquid coexistence at the melting point of NaCl and a pretreatment by pressure, a unique porous structure with an interconnected network of micropores and mesopores is obtained. The micropores can prevent the dissolution of polysulfides, the mesopores can increase the S loading, and the interconnected pore network can significantly improve the usage of active materials. As a result, the cathode with the N-doped carbon matrix shows improved electrochemical performances.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
ChemElectroChem
·
2022
·Vol. 9
·期 11
·e202200375
·
IF 4.782
Junting Sun,Jiaxiang Jin,Yatao Chang,Jing Wang,Qindong Zhang,Junjie Guo
Graphical Ramping rate matters in pyrolysis : Hybrid Co/N−C electrocatalysts were synthesized using NaCl as template via direct pyrolysis method. Ramping rates during pyrolysis was evidenced to affect the porosity and composition of the obtained electrocatalysts due to the different diffusion rates and decomposition reaction of precursors, which have significant influences on their catalytic activities toward oxygen reduction. Pyrolysis is a necessary procedure for synthesizing carbon-based nonprecious metal electrocatalysts via stimulating interaction and carbonization of precursors. In this work, ramping rates that correlated with thermal gradient has been investigated to reveal the configuration evolution of the precursors. Spectra characterizations demonstrated that ramping rates affected decomposition and aromatization of precursors. Increasing ramping rates improved the percentage of doped nitrogen and defects, promoting dispersion of Co atoms in the carbonaceous matrix and increasing density of active sties. In addition, the size variation of NaCl template under different ramping rates modifies the porous structure of Co/N−C electrocatalysts, greatly increasing the percentage of macropores and micropores at rapid ramping rates. As a result, electrocatalysts obtained at 5 °C min −1 exhibit comparable catalytic activity to that of Pt/C due to highly dispersed active sites and rational percentage of porosity, facilitating the sufficient reaction of oxygen along the catalysts. These results shed lights on regulating physical properties of carbonaceous electrocatalysts.
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 ENGINEERING JOURNAL
·
2022
·
IF 16.744
Rui Wang,Hongcen Yang,Niandi Lu,Shulai Lei,Dali Jia,Zhixia Wang,Zhenhua Liu,Xiaogang Wu,Hanzhen Zheng,Salamat Ali,Fei Ma,Shanglong Peng
Developing highly active and robust non-noble metal bifunctional electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is of dominant significance for global applications in rechargeable Metal-air Batteries. Fine-tuning the exposed active sites is a competent way to improve their performance. Herein, the NaCl template-assisted strategy for rationally designing a three-dimensional cellular structured nitrogen-doped carbon matrix integrated with nano-scaled Co species has been developed. The resulting electrocatalyst (3D Co/N-C) exhibits a positive half-wave potential of 0.84 V (vs RHE) in ORR, and a low potential of 1.56 V (vs RHE) at 10 mA cm −2 during OER process. Moreover, 3D Co/N-C based Zn-air Batteries (ZABs) exhibit excellent battery performance, especially remarkable power density. The poisoning experiments and DFT calculations identify active sites as pyridinic N and Co during ORR and OER processes, respectively. This work provides a general and easy-to-perform tactic to design bifunctional catalysts, thus helps precisely modulate effective components for ZABs.
研究领域:
电化学
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材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Ruike Gao,Rong Wang,Yu Wang,Xinyu Liu,Xianning Zheng,Xiaoyu Liu,Jiyue Ding,Shuhan Song,Zequn Ma,Qian Zhang,Zilin Meng
In this study, hollow spherical NaCl was successfully synthesized via crystal growth inhibition technology. Porous carbons were prepared using hollow spherical NaCl templates with varying dosages, and their adsorption capacities for tetracycline (TC) and ciprofloxacin (CIP) were systematically investigated. The microscopic morphology and specific surface area of the samples were thoroughly characterized using SEM and BET analysis. Kinetic analysis revealed that the adsorption processes of TC and CIP by the porous carbon conformed to pseudo-second-order kinetic and intraparticle diffusion models, indicating that the active site was the main factor affecting the adsorption process. Isothermal adsorption studies demonstrated that the Generalized Langmuir model provided a more accurate description of the adsorption behavior compared to the Langmuir model, indicating monolayer adsorption occurring at heterogeneous adsorption sites. Among the synthesized porous carbons, MCS-3 exhibited optimal adsorption performance, achieving adsorption capacities of 404 mg/g for TC and 268 mg/g for CIP. Site energy distribution analysis further confirmed that the adsorption sites on MCS-3 possessed a higher density of adsorption sites and elevated average site energy. Competitive adsorption experiments revealed stronger adsorption affinity of MCS-3 toward TC over CIP. XPS revealed the adsorption mechanism, and the results indicated that the adsorption between the porous carbon and TC/CIP mainly occurred through the synergistic effect of Lewis acid-base interactions and the hydrogen bonding network. Investigation of pH effects indicated that pH modulated adsorption efficiency by altering the surface charge of the porous carbon and the ionization states of TC/CIP. Recycling experiments demonstrated that MCS-3 maintained stable adsorption performance over five cycles, highlighting its excellent recyclability. These findings collectively provide a critical theoretical foundation and practical guidance for the application of porous carbon in the remediation of TC/CIP-contaminated systems.
研究领域:
环境科学
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材料工程
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化学工程
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水处理技术
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吸附科学
✓ 已验证
产品关联
DOI
高影响因子
NANO LETTERS
·
2015
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IF 13.592
Na Li,Gongzheng Yang,Yong Sun,Huawei Song,Hao Cui,Guowei Yang,Chengxin Wang
Transparency has never been integrated into freestanding flexible graphene paper (FF-GP), although FF-GP has been discussed extensively, because a thin transparent graphene sheet will fracture easily when the template or substrate is removed using traditional methods. Here, transparent FF-GP (FFT-GP) was developed using NaCl as the template and was applied in transparent and stretchable supercapacitors. The capacitance was improved by nearly 1000-fold compared with that of the laminated or wrinkled chemical vapor deposition graphene-film-based supercapacitors.
研究领域:
材料科学
·
纳米科技
·
能源材料
·
柔性电子学
·
电化学储能
·
功能薄膜材料
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 28
·14595-14603
·
IF 8.867
Na Li,Xuankai Huang,Haiyan Zhang,Zhicong Shi,Yunyong Li,Chengxin Wang
Individual graphene ribbons, which fully exploit the large surface area of graphene sheets, have been fabricated. Constructing these unique structures into efficient macroscopic functional architectures is an important and challenging step towards practical applications. Here, we produce micro-structured interconnected ribbon-like graphene sheets (MRGs), which were induced by the multistage-recrystallization of NaCl templates in a microwave plasma chemical vapor deposition (MPECVD) system. The MRGs along different directions hang in polygonal graphene walls, which connect with each other forming a three dimensional (3D) transparent and self-supporting graphene film (MRG-GF). The MRG-GF with a large surface area, enhanced flexibility and fast ion/electron transport pathways exhibits improved capacitance (4.88 mF cm−2) and super-long cycle life with good cycling stability (capacitance retention was ∼95.5% after 20 000 cycles). Herein, we provide a novel approach for controlled synthesis of graphene ribbons, and graphene ribbon-based functional structures and composites.
研究领域:
材料科学
·
纳米科技
·
电化学
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 27
·12153-12161
·
IF 2.7
Kun Liu,Ke Hu,Nannan Zhang,Yujing Ling,Xianglong Guan,Taotao Xu,Angli Zhang,Jing Wang,Xiaowu Liu,Xucheng Fu
The performance of the oxygen reduction reaction (ORR) can be enhanced through the utilization of multi-heteroatom doped, porous, and layered electrocatalysts. Nitrogen-doped graphene-like porous carbon (Cu–Fe–CN) was synthesized via a simple and cost-effective NaCl template method using maltose, FeCl3·6H2O, and CuCl2·H2O as precursors. This material exhibits excellent electrocatalytic activity towards the ORR. During the electrocatalysis process, the maltose-derived graphene-like porous carbon possesses abundant pores that facilitate rapid mass and electron transfer. Additionally, the incorporation of polyatomic dopants and the construction of the porous carbon framework result in an abundance of active sites. The optimized Cu–Fe–CN electrocatalyst exhibited a more positive half-wave potential (E1/2 = 0.87 V) in alkaline media, surpassing that of the commercial Pt/C (E1/2 = 0.84 V), and demonstrated exceptional durability. The average discharge voltage of Al–air batteries with the Cu–Fe–CN catalyst is always higher than that of Al–air batteries with the commercial Pt/C catalyst, at the same current density. The present study showcases a convenient approach for fabricating porous low-metal catalysts for the ORR, highlighting their immense potential in ORR catalysis and aluminum–air batteries.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 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）