INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2022
·Vol. 46
·期 15
·22971-22990
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IF 4.672
Guofeng Qiu,Yang Guo,Jie Xu,Wenke Jia,Sixi Guo,Hongguan Wang,Fanhui Guo,Jianjun Wu
Summary Herein, a green and novel FeCl 3 -catalyzed hydrothermal pretreatment method is adopted to convert the bamboo shavings waste into bamboo-based hierarchical porous carbons (BHPCs) with ultra-high specific surface area and excellent electrochemical properties. Utilizing this mild FeCl 3 catalyst can not only promote the dehydration, condensation, and carbonization of bamboo shavings to catalyze the formation of hydrochar, but also facilitate the development of the pore structure of hydrochar. Moreover, the effects of different FeCl 3 solution concentrations, activation temperatures, and KOH/hydrochar ratios on the pore structure of BHPCs and the electrochemical performance of supercapacitors are thoroughly investigated. Compared with the hydrothermal carbonization without FeCl 3 addition, the BHPCs (1-BHPC-800-5) electrode materials obtained by FeCl 3 -catalyzed hydrothermal pretreatment have superior specific surface area (up to 3688 m 2 g −1 ) and total pore volume (as high as 1.989 cm 3 g −1 ). Meanwhile, the best-performing 1-BHPC-800-5 demonstrates outstanding electrochemical performance in supercapacitor applications, providing a pleasant capacitance of 378 F g −1 at 0.5 A g −1 and capacitance retention of 96.6% after 10 000 charge/discharge cycles at 5.0 A g −1 in 6.0 M KOH electrolyte. The energy density can reach 10.3 Wh kg −1 at a power density of 250 W kg −1 in a two-electrode system. Therefore, this novel and efficient catalytic hydrothermal pretreatment method offers a promising prospect for converting waste biomass into hierarchical porous carbon materials with a large specific surface area and excellent electrochemical properties. Key Points Adopting a green FeCl 3 -catalyzed hydrothermal pretreatment method to convert bamboo shavings waste into BHPCs. BHPCs exhibit a hierarchical porous structure and an ultra-high specific surface area (up to 3688 m 2 g −1 ). A very high capacitive performance (378 F g −1 at 0.5 Ag −1 ) is achieved. The excellent rate performance (nearly 71% capacitance retention), outstanding cycle stability (capacitance retention of 96.6% after 10 000 charge/discharge cycles) and large energy density (10.3 Wh kg −1 at 250 W kg −1 ) are demonstrated.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
Forests
·
2024
·Vol. 15
·期 7
·1173
·
IF 2.4
Ying Li,Chunmiao Li,Xueyong Ren,Fuming Chen,Linbi Chen
Bamboo scrimber is a new type of biomass fiber-based composite material with broad application. In this study, self-developed bio-oil phenolic resin (BPF) was used to prepare bamboo scrimber. The effects of hot-pressing temperature, hot-pressing time, and BPF resin solid content on the modulus of rupture (MOR) and modulus of elasticity (MOE) were systematically investigated through single-factor experiments and response surface methodology (RSM). According to the Box-Behnken design (BBD) experiment of the RSM, the effects of all three factors on MOR and MOE are significant. The effects of the main factors affecting the MOR and MOE decreased in the order of resin solid content, hot-pressing temperature, and hot-pressing time. Based on BBD, the optimal conditions for the preparation of bamboo scrimber were determined as follows: a hot-pressing temperature of 150 °C, a hot-pressing time of 27.5 min, and a resin solid content of 29%. Under these conditions, the MOR is 150.05 MPa and the MOE is 12,802 MPa, which are close to the theoretical values, indicating that the optimization results are credible. This study helps to promote the full utilization of bamboo components and provides a reference for the development of high-quality bamboo scrimber.
研究领域:
材料科学
·
林业工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2020
·Vol. 13
·期 2
·477
·
IF 3.057
Hanxiao Huang,Yunshui Yu,Yan Qing,Xiaofeng Zhang,Jia Cui,Hankun Wang
In this study, water-soluble ammonium polyphosphate- (APP) and methyl trimethoxysilane (MTMS)-modified industrial bamboo residue (IBR)-derived holocellulose nanofibrils (HCNF/APP/MTMS) were used as the raw materials to prepare aerogels in a freeze-drying process. Synthetically modified aerogels were confirmed by Fourier transform infrared spectroscopy, X-ray diffraction, and thermal stability measurements. As-prepared HCNF/APP/MTMS aerogels showed themselves to be soft and flexible. The scanning electron microscopy (SEM) analysis showed that the foam-like structure translates into a 3D network structure from HCNF aerogels to HCNF/APP/MTMS aerogels. The compressive modules of the HCNF/APP/MTMS aerogels were decreased from 38 kPa to 8.9 kPa with a density in the range of 12.04–28.54 kg/m3, which was due to the structural change caused by the addition of APP and MTMS. Compared with HCNF aerogels, HCNF/APP/MTMS aerogels showed a high hydrophobicity, in which the water contact angle was 130°, and great flame retardant properties. The peak of heat release rate (pHRR) and total smoke production (TSP) decreased from 466.6 to 219.1 kW/m2and 0.18 to 0.04 m2, respectively, meanwhile, the fire growth rate (FIGRA) decreased to 8.76 kW/s·m2. The thermal conductivity of the HCNF/APP/MTMS aerogels was 0.039 W/m·K. All results indicated the prepared aerogels should be expected to show great potential for thermally insulative materials.Keywords:industrial bamboo residue;holocellulose aerogel;hydrophobicity;fire resistance;thermal insulation material
研究领域:
材料科学
·
生物质工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY
·
2024
·
IF 9
Qiang Hu,Han Zhang,Qiaoting Mao,Jinjiao Zhu,Shihong Zhang,Haiping Yang,Hanping Chen
While numerous research studies have delved into the co-pyrolysis of biomass and plastic waste, limited attention has been devoted to comprehending the interaction mechanism that impacts biomass deoxygenation and carbonization. Therefore, this study explores the co-effect of temperature and polypropylene blending ratio on co-pyrolysis reaction kinetics, distribution of oxygenates/hydrocarbons, as well as the evolution of biochar structure. At a blending ratio of 0.5, the co-pyrolysis exhibits the lowest activation energy (146 kJ/mol), approximately 25.1 % lower than that required for individual pyrolysis . The interaction between bamboo waste with polypropylene increases the O-abstraction process, resulting in the creation of O-containing free radicals and hydrocarbon compounds. The peak proportion of aromatic compounds, reaching approximately 69.5 %, is observed at 700 °C when the blending ratio is 0.5. The H-abstraction process converts large-molecular alkanes into H free radicals and tiny-molecular unsaturated hydrocarbons. The aliphatic functional group content diminishes as the polypropylene ratio increases. The maximum specific surface area (7.70 m 2 /g) and pore volume (21.7 mm 3 /g) are achieved at a blending ratio of 0.75. Notably, polypropylene exerts minimal influence on the graphite crystallite size and graphitization degree of biochar. This research significantly contributes to advancing our understanding of the interaction mechanisms between biomass and plastic waste.
研究领域:
能源与燃料
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环境科学
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生物质转化
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2022
·
IF 3.806
Yinghui Wang,C. Srinivasakannan,Huihao Wang,Gang Xue,Li Wang,Xin Wang,Xinhui Duan
Biochar containing graphene (BCG) was synthesized using the precursor of bamboo biomass and K 2 CO 3 as the activating agent utilizing microwave heating with short duration. The biochar had a typical graphene structure with abundant micropore and extremely high surface area up to 1565 m 2 /g. The activating agent K 2 CO 3 played an important role in the catalytic graphitization , facilitating transformation of amorphous carbon into graphene like carbon. The adsorption experiment exhibited an excellent adsorption capacity of BCG for methylene blue (MB), with a maximum adsorption capacity of 1100 mg/g. The adsorption process was governed both by physical and chemical adsorption . The work further presents the mechanism of activation, adsorption isotherms , adsorption kinetics , adsorption thermodynamics. The experimental resulted proved the successful and fast preparation methodology for graphene contained carbon materials by microwave heating.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 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）