COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Mingen He,Hang Wang,Jiamei Yang,Fuxiang Chu,Yiqiang Wu,Fuquan Xiong
Flexible supercapacitors combine the advantages of conventional supercapacitors, including excellent mechanical properties, stretchability, and bendability, making them crucial components in wearable electronic devices. Herein, nitrogen and phosphorus co-doped lignin-derived carbon nanosphere (NPCS)/reduced graphene oxide (rGO) flexible electrode materials were synthesized through vacuum filtration and reduction methods. With increasing mass ratio of carbon nanospheres, the electrochemical performance of the electrode gradually improved, reaching an outstanding capacitance of 174.6 F g −1 for a 1:1 ratio of NPCS to rGO at 1 A g −1 . Additionally, the electrode maintained stable performance even after bending at different angles. The electrode, assembled into a symmetric supercapacitor with a 6 M KOH electrolyte, exhibited an outstanding capacitance of 130.5 F g −1 at 1 A g −1 and exceptional cycle stability, retaining 98.05% of its original capacitance after 5000 cycles at 5 A g −1 . At a power density of 49.52 W/Kg, the electrode exhibited an energy density of 5.03 Wh/Kg. Moreover, the electrode maintained an excellent capacitance of 143.0 F g −1 in an acidic electrolyte (1 M H 2 SO 4 ) at 1 A g −1 . However, the electrode exhibited reduced capacitance in a neutral electrolyte (1 M Na 2 SO 4 ) but achieved a significantly higher energy density of 22.3 Wh/kg. The flexible electrode material exhibited adaptability to different acid–base conditions and maintained good flexibility, highlighting its significant potential for development in flexible supercapacitors.
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DOI
高影响因子
ENERGY & FUELS
·
2019
·
IF 3.021
Yanliang Song,Xiaoyou Shi,Xue Yang,Xu Zhang,Tianwei Tan
A successive organic solvent fractionation was reported in this work to obtain lignin fractions with narrow molecular weight distribution and high purity from p-toluenesulfonic acid-extracted lignin. A decrease was found in PDI of fractionated lignin compared with parent substrate from 3.31 to 1.44 and the amount of carbohydrate derivates was detected to decline implying an increase of purity. Calculated from the results of DTG, thermal stability of lignin samples was enhanced through successive fractionation, and TG data showed that the mass of remaining char over 500 °C decreases from 51% of initial lignin to 25% of fractionated ones. There was also a decline of glass transition temperature (Tg) determined, from 142.5 to 100.8 °C. Lignin fractions that were dissolved in ethanol and acetone possessed high contents of summed aliphatic and phenolic hydroxyls might due to formation of numerous hydrogen bonds. As shown in 1H–13C HSQC NMR spectra, lignin fractions dissolving in ethyl acetate contained more C–C bonds, mainly β–β, compared with other samples.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Qiao Han,Mooeez Ur Rehman,Junhu Wang,Alexandre Rykov,Oliver Y. Gutiérrez,Yujun Zhao,Shengping Wang,Xinbin Ma,Johannes A. Lercher
The catalytic hydrodeoxygenation (HDO) of lignin-derived phenolic compounds is a critical step in the upgrading of bio-oil. Here, bimetallic Ni-Fe nanoparticles supported on mesoporous carbon spheres (MCSs) were fabricated and applied in HDO of phenol. In comparison with monometallic Ni and Fe catalysts, the bimetallic Ni-Fe catalyst exhibited better performance for phenol HDO due to the formation of Ni-Fe alloy phase identified by X-ray powder diffraction (XRD) and Mössbauer spectroscopy techniques. Among several explored ratios, the catalysts with Ni/Fe ratio of 3/1 presented the highest cyclohexane yield. The reaction occurred in two consecutive steps: the hydrogenation of phenol to cyclohexanol and the further hydrogenolysis of cyclohexanol to cyclohexane. Kinetic studies showed that the hydrogenolysis of cyclohexanol controlled the overall reaction rate of phenol HDO due to the lower reaction rate of this step. Indeed, the turnover frequency (TOF) values of cyclohexanol normalized by surface metallic Ni sites exhibited a linear correlation with Ni-Fe alloy sites. The alloying of iron in the bimetallic Ni-Fe catalysts significantly enhanced the adsorption strength of cyclohexanol, which is the reason of the high activity of the Ni-Fe alloy particles. Thus, Fe-containing sites adsorb the hydroxyl species while Ni sites perform the H 2 activation, their synergistic effect plays a key role in phenol HDO process.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 1
·016504
·
IF 4.316
Haomin Jiang,Yujuan Cheng,Zhaohui Wang,Zhiqun Bai,Yang Tang,Yanzhi Sun,Pingyu Wan,Yongmei Chen
The cleavage of the linkage bonds among the C9 units in lignin molecules via selective oxidation method to obtain small-weight aromatic compounds is an important way to lignin valorisation. In this study, the cleavage pathways of bonds in a lignin model compound, GGE (guaiacylglycerol-β-guaiacyl ether), by the reactive oxygen species (ROS) in situ generated through electrochemical oxygen reduction reaction (ORR) in an aprotic ionic liquid ([BMIM]BF4) was investigated. The results indicated that when the main ROS was ·OOH, coniferyl alcohol, guaiacol and vanillin were detected as the degradation products which is supposed to be caused by β-O-4 bonds cleavage; Otherwise, when HO2− was the main ROS, coniferyl alcohol could not be detected and the degradation reaction is believed to be trigerred by Cα-Cβ bonds cleavage.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Haibin Ji,Somia Yassin Hussain Abdalkarim,Yunfei Shen,Xuefei Chen,Yixuan Zhang,Jiayuan Shen,Hou-Yong Yu
Biomass-based slow-release fertilizers (SRFs) are a sustainable solution for addressing food scarcity, improving fertilizer efficiency, and reducing pollution, whereas they still face complex preparation, high costs, and low release characteristics. This study introduces a simple and innovative approach to producing bifunctional green SRFs with controlled release and conditioning properties for saline soils and harsh environments. The method involves a one-pot preparation of microsphere-structured amine-modified lignin slow-release fertilizer (L-U X ) using biomass lignin as the starting material. The L-U X demonstrates an exceptional fertilizer loading rate (66.2 %) and extended slow-release performance (288 h), effectively enhancing the fertilizer's release ability. Compared to traditional fertilizers, the bifunctional L-U X significantly improves soil water retention capacity (824.3 %), plant growth, and germination percentage in challenging soil conditions (133 %). These findings highlight the potential of L-U X as a large-scale controlled-release fertilizer in harsh environments. A life cycle assessment (LCA) was also conducted to evaluate the environmental impact of L-U X from its production to disposal. This revealed that L-U X has a minimal environmental footprint compared to conventional inorganic fertilizers. This study further supports the widespread application of L-U X as an environmentally friendly alternative.
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高影响因子
BIORESOURCE TECHNOLOGY
·
2020
·
IF 7.539
Qingfeng Liu,Yunfei Bai,Hong Chen,Mengmeng Chen,Yushuai Sang,Kai Wu,Zewei Ma,Yiming Ma,Yongdan Li
The efficient depolymerization and hydrodeoxygenation of enzymatic hydrolysis lignin are achieved in cyclohexane solvents over a gamma-alumina supported nickel molybdenum alloy catalyst in a single step. Under initial 3 MPa hydrogen at 320 °C, the highest overall cycloalkane yield of 104.4 mg/g enzymatic hydrolysis lignin with 44.4 wt% selectivity of ethyl-cyclohexane was obtained. The reaction atmosphere and temperature have significant effects on enzymatic hydrolysis lignin conversion, product type and distribution. The conversion of enzymatic hydrolysis lignin was also investigated over different nickel and molybdenum-based catalysts, and the gamma-alumina supported nickel molybdenum alloy catalyst exhibited the highest activity among those catalysts. To reveal the reaction pathways of alkylphenol hydrodeoxygenation, 4-ethylphenol was tested as a model compound. Complete conversion of 4-ethylphenol into cycloalkanes was achieved. A two-step mechanism of 4-ethylphenol dihydroxylation – hydrogenation is proposed, in which the benzene ring saturation is deemed as the rate-determining step.
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高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2023
·Vol. 28
·期 7
·2021-2033
·
IF 2.5
Duan Yuting,Long Jiadong,Li Yanhang,Tian Xin,Li Jiaqi,Fang Zezhong,Wang Jian,Huo Pengfei
Owing to the increasing low-carbon demand, environmentally friendly supercapacitors with low temperature resistance have attracted increasing attention. Herein, biomass hydrogels were successfully fabricated by covalently cross-linked lignin (Lig) with soy protein isolate (SPI) and assembled into supercapacitors. The performance of hydrogel electrolytes and the electrochemical performance of supercapacitors were studied systematically. The hydrogel electrolyte achieved the highest ionic conductivity of 0.086 S cm −1 with 50% addition of SPI. The supercapacitor displayed an excellent specific capacitance of 150.80 F g −1 at room temperature. Importantly, over 10,000 charge-discharge cycles, the capacitance retention rate maintained more than 73.5%, and the coulombic efficiency was around 100%. Besides, the electrochemical performance of the supercapacitors at low temperature was investigated as well. Even at −20 °C, the flexible supercapacitor could keep a specific capacitance of 135.71 F g −1 , with a capacitance retention rate up to 90% of room temperature, indicating a prominent resistance at subzero temperature. Overall, this work lays a foundation for the preparation of environmentally friendly and low temperature resistant solid-state supercapacitors, which is conducive to the practical application under harsh environments. Graphical
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Yuqing Liang,Hanwen Zuo,Mingyu Wen,Junyou Shi,Heejun Park
The traditional epoxy resin not only is flammable and non-recyclable and but also heavily dependents on petroleum resources, which cannot meet the requirements of fire prevention and sustainable development. In this study, a vanillin intermediate (VAP) with dynamic imine bond (C=N) was prepared by schiff base reaction between the lignin derivative vanillin (-CHO) and the cage-like polyhedral oligomeric silsesquioxane OA-POSS(−NH 2 ). Then, a biomass-based P-N-Si flame retardant (VAPD) was synthesized by adding 9,10-Dihydro-9-Oxa-10-Phosphaphenanthrene-10-Oxide (DOPO) into the VAP. Subsequently, the VAPD acted as curing agent of epoxy resin to prepare epoxy wood coatings (VAPDs/EP). The results showed that the VAPD-5/EP coating not only exhibited excellent self-healing property and was able to achieve 100 % healing within 35 min, but also presented distinctive UV-shielding performance. In addition, the VAPD-5/EP coating reached V-0 level of UL-94 test and got 29.3 % of limiting oxygen index (LOI). Compared with EP coating, the peak heat release rate (pHRR) decreased by 38 %. Furthermore, the VAPD-5/EP coating reached 6H level of hardness test and 4B level of adhesion test. A simple strategy for preparing self-healing flame retardant epoxy coatings with comprehensive properties for protection of wood materials was proposed in this study.
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高影响因子
Bioresource Technology Reports
·
2023
·
IF 0
Shaoqing Wang,Gaixiu Yang,Juntao Yang,Zhen Wan,Zhihe Li,Weiming Yi
In this paper, the ternary molten salt (Li 2 CO 3 -Na 2 CO 3 -K 2 CO 3 ) was introduced into the lignin pyrolysis process for the co-production of monophenols and value-added carbon materials. The effect of lignin/molten salt ratios (i.e., 3:1, 1:1, and 1:3) on lignin pyrolysis behaviour was investigated herein. The pyrolytic products were characterized by gas chromatography–mass spectrometry, ultimate analyses, scanning electron microscopy, nitrogen adsorption analyses, and Raman analyses. Results showed that molten salt media can promote the conversion of bulky phenolic oligomers into mono-phenols by enhancing the cracking and deoxygenation reactions. P-type phenols (49.76 %) were produced when the lignin/molten salt mass ratio was 1:3. The porosity and aromaticity of biochar were regulated in-situ using molten salt. The possible catalytic effect of molten salt on lignin pyrolysis was proposed. This study provides a case reference for lignin waste resource utilization.
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DOI
Waste and Biomass Valorization
·
2018
·Vol. 10
·期 11
·3343-3350
·
IF 1.874
Chen Cheng,Jiang Linfeng,Ma Guanfeng,Jin Dongxue,Zhao Lisha,Ouyang Xinping
Abstract Lignin removal from lignocellulosic materials plays a great role in the utilization cellulose with high efficiency. In order to improve the quality of reconstituted tobacco sheet, lignin existed in tobacco stem was removed by enzymatic hydrolysis with laccase enhanced by weak alkali treatment together with the addition of Tween 80 into laccase treatment system. It is found that lignin was partially removed by laccase. The treatment of tobacco stem with NaHCO 3 resulted in the dissolution of lignin, and hence increased the porosity and specific surface area of the pretreated tobacco stem. Consequently, laccase could access to the tobacco stem more completely. The surface activity and dispersion of Tween 80 improved laccase activity, solubilization of degraded products of lignin, and contact interface between laccase and tobacco stem. The synergistic action of laccase, weak alkali and Tween 80 improved the ratio of lignin removal significantly, reaching as high as 40.3%. Graphical Abstract
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Xianlong Wang,Fangbao Fu,Wenli Zhang,Jiale Wen,Xueqing Qiu
Carbon/transition metal oxide composites hold significant promise for energy storage applications; however, achieving precise control over the carbon structure to enhance the electrochemical activity of metal oxides remains a challenge. In this work, we utilized low-cost enzymatic lignin as a carbon source and harnessed the synergistic effects of magnesium oxide templates and potassium acetate activator to synthesize a lignin-derived hierarchical porous carbon (HPLC) characterized by a high specific surface area of 1704 ± 36 m 2 /g, well-ordered nanosheet structures, and hierarchical porosity. The comparative analysis demonstrated that HPLC exhibited superior pore anchoring and enhanced interfacial Mn-O-C bonding interactions with manganese dioxide compared to mesoporous carbon synthesized via magnesium oxide templating and microporous carbon derived from potassium acetate activation. This unique architecture significantly boosted the charge storage capacity of manganese dioxide. The composite showed remarkable electrochemical performance, achieving a specific capacitance of up to 567 F/g at a current density of 0.5 A/g, while also demonstrating excellent rate capability. An asymmetric capacitor constructed with the composite electrode delivered a high energy density of 47.22 Wh/kg and maintained a capacity retention of 85.2 % after 12,000 cycles at 2.0 A/g, illustrating its outstanding cycling stability. Analysis of the energy storage mechanism revealed that the capacity of this material was predominantly attributed to redox reactions involving manganese species induced by potassium ion insertion and extraction, as well as the double-layer capacitance arising from the adsorption and desorption of potassium ions. This work elucidates the crucial influence of carbon structure on the loading of metal oxides, providing a novel strategy for tuning carbon carrier structures aimed at developing high-performance carbon/metal composites.
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DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2025
·
IF 9
Haitao Yang,Yang Liu,Xingru Wu,Jie Yuan,Lan Yao
To address low cellulose conversion efficiency stemming from recalcitrance of lignocellulose, a novel ternary DES-CTAB (deep eutectic solvents- cetyltrimethylammonium bromide) system was developed by synergistically integrating CTAB with DES. And related underlying mechanisms were elucidated. Pretreated residues properties, lignin structure and lignin-cellulase interaction were systematically characterized. Results indicated that the DES-CTAB pretreatment removed 83.21 % of hemicellulose and 79.37 % of lignin while preserving 88.69 % of cellulose during pretreatment at 150 °C for 1 h. Enzymatic hydrolysis efficiency was enhanced to 71.58 %, representing 36.55 % improvement compared with DES pretreatment. It was revealed that CTAB reduced lignin hydrophobicity, inhibited β-O-4 cleavage and phenolic hydroxyl group formation, and mitigated non-productive cellulase adsorp-tion to residual lignin. Fluorescence spectroscopy analysis confirmed that CTAB significantly weakened lignin-enzyme interactions, as evidenced by a 2–3 order of magnitude decreased in the binding constant (K a ) between cellulase and residual lignin. The results could provide theoretical support for green and efficient biomass pretreatment technologies development.
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DOI
PubMed
高影响因子
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