JOURNAL OF ELECTRONIC MATERIALS
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2024
·Vol. 53
·期 12
·7762-7772
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IF 2.2
Dong Ziming,Dou Jiali,Ye Lin,Jiang Xihuan,Jiao Luwen,Liu Xiaojie,Wang Song
Slow carbonization (SC) and fast carbonization (FC) methods were applied and compared during the preparation of carbon materials using potassium citrate as raw material. The porous carbon material obtained by the SC method (SCPC800) had a slightly higher specific surface area than that obtained by the FC method (FCPC800). When SCPC800 was applied in the construction of a zinc–ion capacitor (ZIC), the obtained ZIC displayed a high mass specific capacitance (MSC) value of 309.5 F g −1 and a specific energy of 155.2 Wh kg −1 at the 0.2 A g −1 current density. FCPC800 showed similar electrochemical performance as SCPC800. The ZIC with the FCPC800 as electrode exhibited an MSC value of 300.7 F g −1 with a specific energy of 150.8 Wh kg −1 at the 0.2 A g −1 current density. Meanwhile, the SCPC800 and FCPC800-based ZICs showed good rate capability and cycle stability. Compared with the SC method, the FC method showed a significant advantage in reducing sample preparation time, which can greatly increase the preparation efficiency and reduce energy consumption. Therefore, as an efficient method, the FC method showed broad application prospects in the preparation of carbon materials for ZIC. Graphical Porous carbon materials prepared from potassium citrate for zinc-ion capacitor
研究领域:
材料科学
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电化学
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DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2025
·
IF 4.1
Gang Liu,Aoyang Zhang,Shams Forruque Ahmed,Xiaoming Guo,Weiwu Ma
Capacitive carbon is a critical material for efficient energy storage in supercapacitors, but its conventional synthesis involves complex multi-step procedures and harsh chemical activators. This study proposes an innovative biomass nanoarchitectonics strategy via one-step synthesis using agricultural waste ryegrass straw as carbon precursor and eco-friendly citrates as activator, yielding porous carbon with excellent electrochemical properties. The optimized material, designated RSC-4K-700, is produced by using potassium citrate as the activating agent, with a highly desirable hierarchical pore structure. It features a hierarchical pore structure with abundant micropores and moderate mesopores, while its surface is enriched with 16.65% oxygen and a high proportion of pyrrolic/pyridinic nitrogen species, which enhances electrochemical reactivity. In a 6M KOH electrolyte two-electrode system, RSC-4K-700 achieves a specific capacitance of 216 F/g at 1 A/g. At a high current density of 5 A/g, it retains 96.98% of initial capacitance after 30,000 charge-discharge cycles, showcasing excellent cycling stability. It delivers a high energy density of 7.61 Wh/kg at a power density of 123.5 W/kg. The biomass nanoarchitectonics approach demonstrated here provides a novel method to utilize biomass for preparing high-performance capacitive carbon electrode materials in supercapacitors.
研究领域:
储能
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材料科学
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纳米技术
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电化学
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可持续化学
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可再生资源
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DOI
高影响因子
JOURNAL OF POWER SOURCES
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2025
·
IF 7.9
Zeyang Chen,Xin Weng,Qibin Zeng,Yunhe Xie,Yifan Liu,Yuancai Lv,Minghua Liu
Nitrogen-doped porous carbon materials derived from agricultural waste are considered ideal for supercapacitor applications. However, current research is limited to nitrogen doping, with insufficient analysis of the effects of different nitrogen species on capacitor performance. This study compares four different nitrogen sources, revealing that the MN-AC electrode material, prepared using melamine as the nitrogen source, effectively enhances the physicochemical structure and electrochemical performance of the electrode. It exhibits the highest surface nitrogen content (4.54 %) and an optimal mesopore rate (20.6 %), with a significant amount of pyrrole nitrogen (53.19 % of the surface content), which notably improves the material's polarization and wettability, thereby enhancing its electrochemical performance. At a current density of 0.5 A g −1 , MN-AC demonstrates a high specific capacitance of 349.3 F g −1 . Furthermore, in a 6 M KOH electrolyte, it achieves an energy density of 20.3 Wh kg −1 and a power density of 169 W kg −1 . DFT analysis indicates that pyrrole nitrogen increases the material's dipole moment, enhancing the adsorption of electrolyte ions (K + ).
研究领域:
材料科学
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能源存储
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DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Yuchen Li,Muqi Chang,Penghao Chai,Qiulong Guan,Jianghuan Li,Lijie Li,Lixia Bao,Wensheng Deng,Jiong Peng,Xin Li
Enhancing Zn 2+ storage necessitates the meticulous design of carbon-based cathodes with specific attributes, notably substantial nitrogen doping and high surface area. However, synthesizing materials that embody both advantages persists as a considerable obstacle. Herein, we introduce a strategy for synthesizing self-assembled supramolecular crystal framework carbonization-activated high nitrogen doping hierarchical porous carbon (H-NPC) with a specific surface area of 2202.96 m 2 g⁻ 1 and a nitrogen doping level of 12.45 at.%, providing a plethora of physical and chemical adsorption sites for Zn 2+ storage. The resulting H-NPC exhibits a notable capacity of 256.7 mAh g −1 at 0.5 A g −1 , achieving a maximum energy density of 213 Wh kg −1 at 450 W kg −1 power density, alongside an extended service life with 91.4 % capacity retention over 10,000 cycles. Density functional theory calculations reveal the role of high nitrogen doping in enhancing the reversible adsorption/desorption of Zn 2+ , augmenting H-NPC's electrical conductivity, electron density at zincophilic active sites, and reducing the energy barrier for Zn 2+ adsorption. This study emphasizes the crucial role of incorporating large specific surface areas and abundant nitrogen atoms into carbon electrodes with the aim of innovating high-efficiency aqueous zinc ion capacitor systems and provides a novel idea for designing new carbon-based materials.
研究领域:
材料科学
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电化学
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2025
·
IF 19
Yanxu Chen,Yangyang Zhang,Jiajing Qi,Xiaoyue He,Shao Wang,Xin Zhao,Jing Xia,Genqiang Zhang
Long-range interactions (LRIs) are crucial for controlling catalytic activity and selectivity in dual-metal catalysts (DMCs). However, understanding their role and utilizing LRIs to find efficient DMCs remains challenging due to the vast exploration space. In this work, it is demonstrated that incorporating focused attention into the Graph Convolutional Network (GCN) model significantly improves prediction performance, without increasing train cost. This modified model, named GCN with Residual Block and Focused Attention (GCN-RBFA), achieves a mean absolute error (MAE) of 0.067 eV for ΔG *OH , outperforming the GCN model (MAE = 0.161 eV). The t-SNE algorithm explains that focusing attention improves accuracy by highlighting differences in composition features, aiding in the distinction of similar samples. Moreover, experimental results on both reported and unreported combinations align with model predictions, validating its practicality and reliability. The further development and application of this model is expected to promote the rapid design and optimization of other efficient DMCs.
研究领域:
材料科学
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计算化学
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DOI
高影响因子
ACS Applied Energy Materials
·
2025
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IF 5.5
Jie Zheng,Ying Li,Yongtao Huang,Zezhong Wang,Wei Zhang,Chunsheng Zhuang
The well-matched thermal expansion coefficient between YBa0.95K0.05Co4O7+δ and electrolyte materials makes it a highly promising electrode for proton-conducting solid oxide fuel cells (H-SOFCs). However, its limited electrochemical performance hampers the enhancement of the cell power density. In this study, we significantly improved the oxygen reduction reactivity and electrochemical properties of YBa0.95K0.05Co4O7+δ by introducing transition metal dopants (Mn/Fe/Ni/Cu/Zn) at the Co site, with a doping concentration of x = 0.05. Experimental results indicate that Mn doping yields the most substantial performance enhancement. Transition metal doping modulates the material’s band gap structure and conductivity, with Mn doping narrowing the band gap and enhancing conductivity by 105%. Conductivity relaxation tests further confirm that Mn doping accelerates oxygen ion transport, reducing the relaxation time. X-ray photoelectron spectroscopy analysis shows that the oxygen vacancy concentration in the Mn-doped systems increases by 72%. Symmetric cell tests reveal that Mn doping reduces cathodic polarization impedance by 33% at 700 °C, while Fe, Ni, and Zn doping results in varying impedance increases due to competitive mechanisms. The peak power density of a single cell with the Mn-doped cathode reaches 657 mW cm–2 at 700 °C, surpassing the 531 mW cm–2 obtained with the undoped sample. This work demonstrates the efficacy of a multielement doping strategy to optimize SOFC electrode materials, offering an approach for their design.
研究领域:
材料科学
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电化学
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能源材料
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燃料电池
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固态离子学
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DOI
高影响因子
Environmental Chemistry and Ecotoxicology
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2025
·
IF 8.2
Gao Feiyue,Zhou Chuncai,Li Chen,Xu Shihai,Li Zhiguo,Li Xin,Liu Guijian
The novel ultra-micro porous carbon sheet (PCs) with exceptionally high surface area (3034 m 2 /g) were synthesized through green potassium citrate (K 3 C 6 H 5 O 7 ) activation for efficient thallium(I) [Tl(I)] removal from wastewater. The static adsorption results revealed that PCs achieved exceptional removal efficiencies above 95 % across pH 6–12, maintained high selectivity against competing ions (K + , Na + , Cl − , F − ) and organic interferents, and retained above 80 % capacity after five regeneration cycles. Adsorption followed Pseudo-second order kinetics and Freundlich isotherm models, indicating multilayer adsorption on heterogeneous surfaces, with thermodynamics confirming spontaneous exothermic processes. The density functional theory (DFT) calculation results demonstrated that lone pair electrons involved in complexation and π-electrons participating in coordination were supplied by oxygen-containing functional groups and aromatic rings, respectively. The sorption mechanisms included surface complexation, ion exchange, electrostatic attraction, and cation-π interaction. The column sorption results demonstrated the influent flow rate, bed height, and initial Tl(I) concentration-dependent removal performance. The Tl(I)-containing wastewater at ppm level could meet the discharge standard by optimizing influent flow rate and bed height in column adsorption. The dynamic sorption process was described properly by Thomas and Yoon-Nelson models. This study provides a systematic theoretical foundation for designing porous carbons in Tl-contaminated water remediation.
研究领域:
环境科学
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材料工程
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水处理技术
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物理化学
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计算化学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 26
·49072-49078
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IF 5.6
Jie Zheng,Ying Li,Yongtao Huang,Zezhong Wang,Wei Zhang,Chunsheng Zhuang
To assess the potential of YBaCo 4 O 7+δ as a cathode material for proton-conducting solid oxide fuel cells (SOFCs), a proton-oxygen-ion-electron three-phase conductive cathode, YBa 1- x K x Co 4 O 7+δ , was synthesized via the sol-gel method and analyzed concerning its crystal structure, thermal expansion behavior, and electrochemical properties. The results indicate that K doping increases the oxygen vacancy content and enhances proton conductivity. The polarization impedance reaches its minimum when x = 0.05. K doping has a negligible impact on the coefficient of thermal expansion (CTE), and all doped samples exhibit CTEs that align well with common electrolyte materials, thus minimizing thermal stress during SOFC operation. Compared to YBaCo 4 O 7+δ , partial K doping improves the catalytic activity for the oxygen reduction reaction. An anode-supported single cell with the YBa 0.95 K 0.05 Co 4 O 7+δ cathode, using H 2 fuel, delivers a peak power density of 567 mW cm −2 at 700 °C, surpassing the performance of the YBaCo 4 O 7+δ cathode, which achieves 482 mW cm −2 under the same conditions. This study contributes to the development of hexagonal unit-cell cathodes with proton-oxygen-ion-electron three-phase conductivity and high catalytic activity for proton-conducting SOFCs.
研究领域:
材料科学
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电化学
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能源材料
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固体氧化物燃料电池
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DOI
高影响因子
Materials Today Communications
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2024
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IF 3.7
He Lian,Yuqiong Zhao,Liping Wang,Ying Wang,Guojie Zhang,Yongfa Zhang
This study developed a low-corrosive method for preparing porous carbons with a concentrated pore distribution for CH 4 /N 2 separation. Pine chips were impregnated with H 3 PO 4 and activated with CO 2 or C 6 H 5 K 3 O 7 to obtain microporous carbon. The differences in physical structure and surface chemistry of the porous carbons were analyzed to explore their impact on the CH 4 adsorption properties. The carbonization mechanism of pine chips was preliminarily explored. The results showed that H 3 PO 4 impregnation caused the pine chips to swell and form low molecular compounds, which promoted deeper penetration of C 6 H 5 K 3 O 7 into the carbon matrix. Further etching of K + promoted the formation of narrow microporous structures and introduced extra oxygen groups on the material surface. The CH 4 adsorption performance of porous carbon is closely related to the volume of ultramicropores between 0.45 and 0.7 nm, specific oxygen groups and specific surface area. Correspondingly, owing to its narrow pore size distribution , higher specific surface area (1341 m 2 /g) and greater microporous volume (0.57 cm 3 /g), HCK5.5 (C 6 H 5 K 3 O 7 addition ratio of 5.5) exhibited an impressive adsorption capacity of 1.77 mol/g for CH 4 at 298 K, surpassing that of most MOF and carbon materials. Moreover, the prepared adsorbents exhibited reasonable heat of adsorption and excellent regenerability. This study provides new insights into the development of narrow microporous carbon materials for CH 4 /N 2 separation.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Jianhui Li,Haiting Yan,Dongfeng Dang,Wei Wei,Lingjie Meng
Graphene has attracted enormous attention due to its unique physical properties and attractive applications in many fields. However, it is an ongoing challenge to develop a facile and low-cost method for the large scale preparation of high-quality graphene (HQGr). In this work, we have developed an improved liquid-phase exfoliation method to mass produce HQGr. This method is quite simple but efficient by exfoliation of graphite in organic solvent with the co-assistance of sodium citrate and water. Remarkably, the concentration of as-exfoliated HQGr was as high as 0.71 mg/mL under optimal conditions, while the oxygen content in HQGr was only 2.39%. After annealing at 500 °C for 2 h in argon atmosphere, the mean conductivity of annealed HQGr was as high as 1.4 × 10 4 S m −1 . Therefore, this facile method for liquid-phase exfoliation of graphite has excellent potential in the industrial-scale production of HQGr for numerous applications in energy storage, optical and electronic fields.
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 13
·38174-38184
·
IF 5.19
Zhang Ziang,Ma Yan,Li Aimin,Pan Yang,Yao Qianqian,Jia Xiaorui,Zhou Qing
The hydrophilic substances in natural organic matter (NOM) are the main precursor of disinfection by-products (DBPs) formed during disinfection processes. The fractionation of the components in NOM based on hydrophilicity contributes to elaborating the behavior of NOM during disinfection. However, the traditional NOM fractionation method using two hydrophobic resins of DAX-8 and XAD-4 lays emphasis on the separation of hydrophobic substances, limiting the thorough study of the hydrophilic components in NOM. In this work, the amphiphilic resin NDAM was employed as a replacement of XAD-4 to realize more thorough separation of the hydrophilic substances. Compared with the divinylbenzene (DVB) structure of XAD-4, the NDAM possesses a more hydrophilic skeleton of N-vinylpyrrolidone (NVP) and DVB which favors the adsorption of hydrophilic components in NOM. The two fractionation methods of DAX-8 + XAD-4 and DAX-8 + NDAM were applied to fractionate NOM, and the obtained fractions were characterized via fluorescence spectra, UV spectra, acid–base titration, the partition coefficients of aqueous two-phase systems(ATPs), and 1H nuclear magnetic resonance (1H-NMR). The results showed that the transphilic fractions separated by XAD-4 accounted for 11.09% of NOM, while the proportion increased to 20.33% with the method of NDAM fractionation. Besides, the hydrophilic components enriched by NDAM not only have more π-conjugated systems and more aromatic structure but also contain more oxygen-containing and nitrogen-containing functional groups. In addition, the hydrophilic fractions separated by NDAM contained more DBP precursors. The NDAM separates more NOM which can produce bromine-containing DBPs into HPIA, and the DBP productivity of HPIN is significantly higher than that of XAD-4. In general, the NOM fractionation method proposed in this study utilizing NDAM resin could fractionate the hydrophilic fractions in NOM more thoroughly, showing application potential in the analysis and control of DBPs formed from NOM.
研究领域:
环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF FOOD PROPERTIES
·
2022
·
IF 3.388
Ming-Yang Wang,Ping Zhang,Yu-Zhu Zhang,Xiao-Yan Yuan,Rong-Xiang Chen
Osmanthus fragrans (Thunb.) Lour. flowers are important natural resource of phenolic compounds, which have antioxidant activities and have been consumed as functional food and dietary supplements for thousand years. Ultra-performance liquid chromatography coupled with electrochemical detection (UPLC-ECD) was developed to simultaneously analyze the eight phenolic compounds in Osmanthus fragrans flowers collected from different regions across China. The UPLC-ECD fingerprint was established for identification and comprehensive quality control. The antioxidant capacities of Osmanthus fragrans flowers were evaluated, and results were compared with those spectrophotometric antioxidant methods. A highly positive relationship was confirmed between the total peak area of characteristic components in chromatogram and the antioxidant potential determined by spectrophotometry with correlation coefficient greater than 0.80 (p < .01). Grey relational analysis showed that acteoside had the highest degree of correlation with antioxidant capacity. These results provided evidence to support the use of UPLC-ECD as a simple, rapid, and reliable method for electroactive phenolic component determination and antioxidant capacity quantification in vitro system.
研究领域:
植物学
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分析化学
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食品科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）