APPLIED CATALYSIS A-GENERAL
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2024
·
IF 4.7
Xinzheng Ma,Jingyi Chen,Ziang Zhao,Ronghe Lin,Xiaoling Mou,Yihui Li,Li Yan,Hejun Zhu,Yunjie Ding
Solvent-free oxidation of benzyl alcohol on bimetallic Pt-Bi catalysts supported on activated carbon (AC), carbon black, carbon nanotube, and N-doped carbon (NC) was studied. While the dispersions of both metals significantly increased on all the bimetallic catalysts, the composition and distribution of the metal species were strongly influenced by different supports. The formation of PtBi alloy was favored on most supports except AC, where aggregation of Bi was observed. Moreover, the oxidation activity was found to closely link to the surface Bi:Pt ratios. Extensive optimizations on PtBi/NC catalyst in batch and flow reactors yielded impressive benzaldehyde yields of 86 % and 70 %, respectively, under mild conditions, which are comparable or even superior to the performances of most state-of-the-art catalysts. Notably, a 96-hour continuous test in a trickle-bed reactor demonstrated stable operation without catalyst deactivation, demonstrating the promising industrial potential.
研究领域:
催化
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ENERGY
·
2020
·
IF 8.848
Qianyang Chen,Qianyuan Qiu,Xiaomin Yan,Mingyang Zhou,Yapeng Zhang,Zhijun Liu,Weizi Cai,Wei Wang,Jiang Liu
The direct carbon solid oxide fuel cell is a potential technology that efficiently and cleanly converts the chemical energy of solid carbon into electricity. Its superiority of all-solid-state configuration and unique operating mechanism indicate that it has a good application prospect in high energy density portable or backup power supplys. It can also be used to convert coal into electrical power. Here, for the first time, we report a compact direct carbon solid oxide fuel cell stack with 12 cells fabricated on a single 10 × 10 cm electrolyte plate. The plate covers a container filled with solid carbon-rich fuel to form a stack. No sealant and pipelines are needed and the carbon-rich fuel can be reloaded. Both activated carbon and sawdust of bauhinia tree branch are used as the fuel. The output power of such a stack approaches more than 10 W at 800 °C. Using 15 g of 5 wt% Fe-loaded activated carbon as the fuel, a stack discharging at a constant current of 1.5 A outputs an energy of 29 Wh, correspongding to an energy desnity of carbon of ∼2000 Wh kg −1 . This work shows the feasibility of developing direct carbon solid oxide fuel cell into a compact electricity generator using readily available carbon-rich fuels. It also shows promise of using this technology in clean and efficient conversion of coal to electricity.
研究领域:
能源工程
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材料科学
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环境科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Mengyao Li,Lixin Wang,Wanning Xiong,Linlin Zhao,Yi Tian,Mengting Cheng,Yuzhu Wang,Zejun Li,Xinjun Wang,Qingquan Sheng,Yongfeng Luo
The rational design and synthesis of carbon nanocages with highly complex porous structures are continuously facing challenges in the development of high-performance supercapacitors (SCs). The electrochemical performance characteristics of electrodes rely on their compositions and fabrication methods. Here, we propose a universal and efficient approach for the in-situ synthesis of zeolitic imidazolate framework-8 (ZIF-8) on porous carbonized wood, where the selective utilization of hexacarbonyl molybdenum protects the structural integrity of the ZIF-8 precursor, preventing collapse during thermal treatment. The subsequent pyrolysis process leads to the formation of small-sized molybdenum carbide (MoC) which are embedded in carbon nanocages (CN). The composite electrode consists of MoC/CN embedded in a porous carbonized wood (PCW), and it shows area-specific capacity of 9.7F cm −2 and 9.4 F cm −2 at 5 mA cm −2 and 30 mA cm −2 , respectively. Subsequently, the symmetric supercapacitor , with two MoC/CN@PCW electrodes exhibits a areal specific capacitance of 2.7 F cm −2 at 5 mA cm −2 . Moreover, this supercapacitor maintains an capacitance retention rate of 98.5 % after 12,000 discharge cycles. The supercapacitor exhibits a power density of 6.5 mW cm −2 , resulting in an energy density of 0.864 mWh cm −2 . Therefore, the utilization of wood-based electrodes holds promise for energy storage systems.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
·
2020
·
IF 7.635
Yadong Wu,Duraisami Dhamodharan,Zian Wang,Rui Wang,Lixin Wu
In this work, an impregnated carbon fiber-carbon nanotubes (CF-CNTs) hybrid fiber mat with excellent ability to enhance mechanical property was fabricated via combining electrophoretic deposition (EPD) process and the following solution pre-impregnation treatment. Their effects on the mechanical and electrical properties of carbon fiber reinforced polycarbonate (PC) matrix composites (CFRP) were systematically investigated. The results showed that the functionalized CNTs were uniformly coated on CF surface after the EPD treatment and the nano-coating enhanced the contact area and surface wettability of CF. Coupled with the solution pre-impregnation treatment, the CF-CNTs fiber bundles were fully impregnated by PC matrix and the interface connection was also improved. Compared with CF/PC composites, mechanical property was improved significantly. The tensile strength (344.8 MPa) and modulus (37.8 GPa) were improved by 46.5% and 57.5%, respectively, surpassing most of the reported values. The impact strength (36.5 kJ/m 2 ) and storage modulus (49.0 GPa) obtained the 268.7% and 78.4% increment, respectively. In addition, the through-thickness electrical conductivity achieved 53.8% improvement. This investigation confirms that the impregnated CF/CNTs hybrid fibers own outstanding mechanical property enhancement function, which are suitable for preparing CF/CNTs reinforcements with high mechanical properties .
研究领域:
材料科学
·
复合材料工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Huangying Wang,Haiyang Yan,Kang Peng,Junying Yan,Rong Fu,Ruirui Li,Baoying Wang,Chenxiao Jiang,Yaoming Wang,Tongwen Xu
The growth of CO 2 emissions is a critical challenge to the global ecological system. Meanwhile, the rising use of evaporation units in industrial wastewater treatment plants has generated a large number of salts with low values for further valorization. In this study, a direct electrochemical substitution electrodialytic system is proposed for the conversion of CO 2 and Na 2 SO 4 into high value-added NaHCO 3 and H 2 SO 4 . The CO 2 is absorbed with polyethyleneimine and further metathesized with inorganic salts in an electrodialytic reactor. This unique system achieves soda preparation by avoiding the use of ammonia as a feedstock and demonstrates the ability to capture and convert CO 2 at a specific energy consumption of 1.2 kWh/kg NaHCO 3 and a current efficiency of 83%. This proof-of-concept study provides a highly effective technological pathway for the conversion of notorious wastes into valuable resources, creating possibilities for concurrent carbon reduction and wasted salt utilization.
研究领域:
环境科学
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化学工程
✓ 已验证
DOI
高影响因子
Journal of CO2 Utilization
·
2021
·
IF 7.132
Jinsong Shi,Hongmin Cui,Jianguo Xu,Nanfu Yan,Chao Zhang,Shengyong You
Porous carbon with specifically designed structure as CO 2 adsorbent is a very attractive and interesting research topic. In this study, we presented the synthesis and CO 2 adsorption of flower shaped porous carbons. Flower-like hydrochar derived from the hydrothermal reaction of glucose, cobalt sulfate, and hexamethylenetetramine was used as the precursor, which was converted to carbon flower during CO 2 activation. The flowers had hierarchically macro-meso-microporous structure. Interspaces and voids were formed by assembly of the petals, and the petals were distributed with pores of different scales. The formation mechanism of, and influences of various synthesis parameters on the flower shape were studied and analyzed. The carbon flowers exhibited surface area of 422−691 m 2 /g, and very high nitrogen content of 9.31–11.91 wt%. CO 2 adsorption performances of the carbon flowers were also studied. Influences of the textural properties and doped nitrogen on the adsorption performances were investigated. The experiment results demonstrated that nitrogen doping showed positive effects on CO 2 uptake at 1 bar, and had strong influence on the CO 2 /N 2 selectivity.
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
ChemistrySelect
·
2025
·Vol. 10
·期 32
·e03728
·
IF 2
Yong Rui Wang,Su Dan Bao,Agula Bao,Zheng Ming Li,Bodeligeteng Huang
Graphical This study develops nitrogen-enriched porous carbon materials using chitosan and g-C 3 N 5 through hydrothermal carbonization and pyrolysis. The optimized adsorbent (S200-6) exhibits a high CO 2 adsorption capacity (3.98 mmol/g at 298 K, 1 bar), large specific surface area (2306 m 2 /g), and excellent selectivity (14.3 for CO 2 /N 2 ). Carbon capture and storage are crucial because of the environmental issues caused by excessive CO 2 emissions. Porous carbon is considered the most promising adsorbent. The precise adjustment of the pore structure and surface active sites of samples is necessary to increase their CO 2 adsorption capacity. In this study, chitosan-based N-doped porous carbon materials were developed using g-C 3 N 5 as the self-sacrificial templating agent and N dopant, respectively, via hydrothermal and pyrolytic activation methods. CO 2 adsorbents possessing a large specific surface area (2084–2450 m 2 /g), microporous structure, and N content were synthesized by varying the hydrothermal temperature and g-C 3 N 5 ratio. The maximum CO 2 adsorption capacity of the highest-performing adsorbent S200-6 was 3.98 mmol/g at 298 K and 1 bar. After 10 CO 2 adsorption and desorption cycles, S200-6 retained 94% of its initial adsorption capacity, indicating its excellent reusable stability. This study demonstrates the feasible preparation of porous carbon materials through a combination of g-C 3 N 5 with hydrothermal and pyrolytic activation methods and reveals the application potential of S200-6 as a CO 2 adsorbent.
研究领域:
环境科学
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材料科学
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化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Advances
·
2021
·Vol. 3
·期 16
·4858-4865
·
IF 4.553
Hongqiang Wang,Xin Li,Jiming Peng,Yezheng Cai,Juantao Jiang,Qingyu Li
Rational interface control of porous carbon electrode materials is of significance for achieving efficient supercapacitors. Herein, biomass-derived carbon microspheres with a highly graphitized porous surface and amorphous subsurface were well constructed via a flexible coupled catalysis-activation process. The unique structure not only endows the carbon microspheres with rapid electron transfer but also an ultra-high specific surface area. Owing to the optimized graphitized/amorphous structure, the obtained graphitized and activated starch-derived carbon microspheres display obviously impressive energy storage capability among the reported starch-derived carbon materials, even though they were evaluated in a narrow voltage window. The assembled symmetrical supercapacitor based on the optimized carbon microspheres exhibits a high capacitance of 198 F g−1 at 1 A g−1, a high energy density of 14.67 W h kg−1 at a power density of 4142.80 W kg−1, robust cycle performance, and good rate performance in alkaline aqueous electrolyte. This work provides a strategy for flexible construction of biomass-derived carbon electrode materials, with an optimized graphitized/amorphous and porous structure, for boosted energy storage in supercapacitor applications.
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
Nanoscale
·
2025
·
IF 5.1
Qingqing Xu,Kaixuan Su,Jiayong Chen,Yuanhong Zhong,Yingxia Zhao,Ming Sun,Lin Yu
The consumption of fossil fuels has led to a significant increase in CO2 in the atmosphere, resulting in the greenhouse effect and placing tremendous pressure on the global environment. The electrocatalytic reduction of CO2 to produce the high-value chemical formic acid or formate is an efficient and environmentally friendly method with significant practical implications for achieving carbon neutrality. This study presents a nanocomposite catalyst of bismuth oxycarbonate loaded on nitrogen-doped carbon materials (BOC-NC), prepared using a hydrothermal method. In an H-type electrolytic cell, the BOC-NC-900 °C catalyst exhibited an excellent electrochemical reduction of CO2 (CO2RR) performance, achieving a Faradaic efficiency of 94.9% for formate production and maintaining catalytic stability over 38 h of CO2RR at -1.0 V vs. RHE. While in a flow cell configuration, it achieved a current density of 91 mA cm-2, a Faradaic efficiency of 90.5% for the formate, and sustained stability over ten hours at -1.0 V vs. RHE. The synergistic effect generated between BOC and NC enhances the formate selectivity, providing valuable insights for developing composite materials that integrate bismuth-based catalysts with carbon matrices.
研究领域:
环境科学
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材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Cheng Fang,Ping Hu,Shun Dong,Yuan Cheng,Dongyang Zhang,Xinghong Zhang
The development of high-performance flexible supercapacitor using biomass wastes as raw materials to overcome the high manufacturing cost has attracted excellent interest. Herein, a hierarchical structure of carbon nanorods supported hydrothermal carbons and carbon fibers (CNR/HTC/CFs) with superior electrochemical performance as well as high strength is successfully designed for the first-time using waste straw as a sustainable and economic carbon resource. The straw pyrolysis gases after purification are introduced to support the formation of high specific surface area CNRs via a simple vapor phase growth process. The CNR/HTC/CFs exhibit high mass specific capacitance of 269.47 F g −1 under the scan rate of 3 mV s −1 in three-electrode system. A high energy density of 15.54 Wh kg −1 with the power density of 0.49 kW kg −1 was obtained in the as-assembled all solid-state supercapacitor device with gel electrolyte, whose value retains as high as 6.99 Wh kg −1 with the power density of 10.01 kW kg −1 . The tensile strength of the finally fibers can reach up to 2743 ± 467 MPa, which is sufficient for many practical industrial applications. This work provides a feasible synthetic strategy using sustainable biomass waste as raw materials to prepare high strength and capacitance energy storage devices.
研究领域:
材料科学
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能源工程
·
环境科学
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Leizhi Zheng,Yang Xu,Chenyang Huang,Jia Liu,Lei Zhou,Chengbao Liu
Graphitic carbon nitride (g-C 3 N 4 ) containing conjugated tri-s-triazine units has a high abundance of amine and guanidine groups, which are ideal for the application of CO 2 conversion. However, absolute g-C 3 N 4 is inherently scarce in Lewis base sites, which leads to low catalytic activities. In this study, we present a simple and green method to in situ construct chrysanthemum stalk-derived porous carbon/ highly active defective g-C 3 N 4 (PC/g-C 3 N 4 ) through hydrogen bond, increasing the surface area and a high density of Lewis base sites. The chrysanthemum stalk contains cellulose, hemicellulose and lignin, which possess a significant number of hydroxyl functional groups and drain channels, thereby providing more hydrogen bonding for highly active defective g-C 3 N 4 . The XPS spectra revealed that, in comparison to PC/g-C 3 N 4 –1 and PC/ g-C 3 N 4 –2.5, PC/g-C 3 N 4 –2 exhibited a higher C-NH 2 content at the edge of the nitrogen element. PC/g-C 3 N 4 –2 had a high specific surface area to expose more active sites for absorbing CO 2 . The quantification of the base sites is determined by the peak area of the thermal programmed desorption of CO 2 and is 229.6 μmol/g for PC/g-C 3 N 4 –2. PC/g-C 3 N 4 –2 demonstrated excellent catalytic activity in the cycloaddition with hierarchical pores. The yield of cyclic carbonate was up to 99% with a selectivity of 99% under mild solvent-free conditions. The mechanistic studies indicate that PC/g-C 3 N 4 –2 not only captured CO 2 , but also provided hydrogen bonds to activate the oxygen atom of epichlorohydrin (ECH). It is our contention that the multifunctional organic-inorganic hybrid materials have considerable potential for the production of cyclic carbonate.
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
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Tao Zhang,Ruijia Wang,Wei Li,Shujun Li,Bing Tian,Shouxin Liu,Zhijun Chen
A simple carbon dots (CDs) catalyst prepared from lignin-derived syringic acid was used for catalytic fixation of CO2 with epoxides to synthesize cyclic carbonates. The catalysts exhibited high catalytic performance which can proceed the reaction under metal-, solvent-, halogen-, and additive-free conditions with 1 atm of CO2 and 80 °C reaction temperature. Various cyclic carbonates could be obtained in high yields and selectivities under the extremely mild catalytic conditions. Additionally, the CDs catalysts showed excellent recyclability with stable catalytic activity. Mechanistic study revealed that the hydroxyl groups on the surface of CDs are responsible for epoxides activation and nitrogen-containing sites (graphitic N and pyridinic N) are crucial for CO2 activation. The cheap precursors, easy and sustainable preparation of catalyst, mild and simple operation of CO2 fixation make the CDs catalyst a promising catalyst for the CO2 conversion.
研究领域:
化学
·
环境科学
·
催化材料
✓ 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）