International Journal of Environmental Research and Public Health
·
2023
·Vol. 20
·期 4
·3437
·
IF 4.614
Fan Zhao,Yini Chen,Shiyang Zhang,Meng Li,Xinhua Tang
A three-dimensional (3D) anode is essential for high-performance microbial fuel cells (MFCs). In this study, 3D porous carbon monoliths from a wax gourd (WGCM) were obtained by freeze-drying and carbonization. Nano-TiO2was further coated onto the surface of WGCM to obtain a nano-TiO2/WGCM anode. The WGCM anode enhanced the maximum power density of MFCs by 167.9% compared with the carbon felt anode, while nano-TiO2/WGCM anode additionally increased the value by 45.8% to achieve 1396.2 mW/m2. WGCM enhancement was due to the 3D porous structure, the good conductivity and the surface hydrophilicity, which enhanced electroactive biofilm formation and anodic electron transfer. In addition, nano-TiO2modification enhanced the enrichment ofAcinetobacter, an electricigen, by 31.0% on the anode to further improve the power production. The results demonstrated that the nano-TiO2/WGCM was an effective anode for power enhancement in MFCs.Keywords:microbial fuel cells;anode;carbon monolith;nano-TiO2;Acinetobacter
研究领域:
环境科学
·
微生物学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2025
·
IF 3.2
Yuan Yong,Liu Tingting,Bu Fanxing,Huang Xiao,Luo Hongjie
Glassy carbon monoliths (GCMs) are one of the most attractive carbon materials presently, while their applications are limited by their fussy fabrication processes and relatively poor mechanical properties. Herein, we report a facile fabrication method of high-strength crack-free GCMs using furfuryl alcohol via sol-gel process and direct drying at ambient conditions followed by carbonization. The in-situ volume shrinkage results reveal that volume shrinkage and mass loss show similar trends during the whole carbonization process and the percentage of volume shrinkage is always higher than that of mass loss, so that highly densified nonporous carbon monoliths instead of normally porous materials are acquired. Our results indicate that the kinetics of the sol formation plays a vital role in controlling the evolution process, mechanical properties, and microstructure of the carbon monoliths. By tuning the kinetics of the sol formation, GCMs of compressive strength ranging in 12.4–41.5 MPa can be prepared. HRTEM images show that nanoscale graphite dispersed in GCMs can be formed at a very low carbonization temperature, whose quantity and morphology are strongly affected by sol reaction time. Graphical
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2018
·Vol. 15
·期 5
·1804158
·
IF 9.598
Lei Liu,Yu Chen,Yihao Xie,Peng Tao,Zijing Wang,Qingyi Li,Kexin Wang,Chenglin Yan
Slow ion kinetics of negative electrode materials is the main factor of limiting fast charge and discharge of batteries. Sluggish Na + kinetics property leads to large electrode polarization, resulting in poor rate and cyclic performances. Herein, an electrode of ultrasmall tin nanoparticles decorated in N, S codoped carbon monolith (TCM) with exceptional high-rate capability and ultrastable cycling behavior for Na-storage is reported. The resulted TCM electrode exhibits an extremely high retention of 96% initial charge capacity after 500 cycles at a current density of 500 mA g −1 . Significantly, when the current density is elevated to an ultrahigh rate of 5000 mA g −1 , a high reversible capacity of 228 mAh g −1 after the 2000th cycle is still maintained. More importantly, the stable and fast Na-storage of TCM is investigated and understood by experimental characterizations and kinetics calculations, including interfacial ion/electron transport behavior, ion diffusion, and quantitative pseudocapacitive analysis. These investigations elucidate that the TCM shows improved ion/electron conductivity and enhanced interfacial kinetics. An entirely new perspective to deep insights into the fast ion/electron transport mechanisms revealed by interfacial kinetics of sodiation/desodiation, which contributes to the profound understanding for developing fast charging/discharging and long-term stable electrodes in sodium-ion batteries, is provided.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 81
·51096-51103
·
IF 3.108
Zhen Zhang,Junzong Feng,Yonggang Jiang,Jian Feng
Through a facile and novel high-pressure salt templating approach, a crack-free hierarchically porous carbon monolith without visible volume changes was prepared using 1-ethyl-3-methyl-imidazolium dicyanamide (Emim-dca) as a carbon precursor. TG-DSC and FT-IR measurements revealed that Emim-dca pyrolysis, decomposition, crosslinking and carbonization reactions occurred in turn at temperatures of 234–350 °C, 350–520 °C and 520–1000 °C, respectively, which provides a guide for the preparation of an intact porous carbon monolith. The porous carbon monolith prepared at 4 MPa is amorphous and composed of small, uniform carbon particles with interconnected interstitial pores. Its bulk density is 0.072 g cm−3. Besides the advantages of well monolithic formability and integrity derived from high pressure strategy, interestingly, the obtained porous carbon monolith possesses a higher specific surface area compared to the porous carbon powders fabricated through ambient pressure salt templating. The meso and macro specific surface area of the resultant porous carbon monolith is nearly three times higher (314.0 versus 106.7 m2 g−1) with the content of 4 nm mesopore increasing dramatically compared to that of porous carbon powders prepared under ambient pressure, while the architecture of micropores keeps unchanged. These results might be explained as follows. The high pressure compresses gas molecules from the decomposition reaction into the carbon skeleton to form super-mesopores and macropores and simultaneously disperses salt clusters, generating small (∼4 nm) mesopores. As a solution to volume expansion in powders obtained via salt templating, the high pressure results in a porous carbon with an intact monolithic shape without volume expansion or shrinkage. Thus, fiber-reinforced porous carbon composites can be prepared for ultra-high-temperature insulation using the high-pressure salt templating method.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 32
·12785-12791
·
IF 0
Shengyang Tao,Yuchao Wang,Da Shi,Yonglin An,Jieshan Qiu,Yishan Zhao,Yan Cao,Xuefang Zhang
An efficient strategy is developed for producing hierarchically porous graphite (HPG) monoliths with a bimodal pore structure through a confined graphitizing process with FeCl3 as the catalyst. The microspace in a silica microreactor is used for molding and protecting the carbon structure without collapse during crystallization. Especially, the confined graphitization approach is favorable for forming highly crystallized graphite materials with large specific surface at low preparation temperature. It balances the benefits of a porous structure and degree of crystallization. Due to the outstanding physical and chemical properties, the graphitized porous carbon exhibits excellent electrochemical performances. HPG shows high sensitivity for use as sensing electrodes. Additionally, HPG also exhibits remarkable stabilization on capacitance at large current densities as a supercapacitor. There is hardly any loss in specific capacitance even with a charge current of 30 to 50 A g−1.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
Pigment & Resin Technology
·
2024
·
IF 1.3
Sipeng Fang,Zheqing Gong,Lijun Chen
PurposeThe purpose of this paper is that the long fluorocarbon monomer is used to modify the latex. The film of the resultant latex has the C-F bond with high bond energy and low surface energy, which can effectively improve the heat resistance and water resistance of the resultant film. In addition, a mixture of CO-436 and dibutyl maleate (DBM) as surfactants is used as the emulsifier, which brings the new application of the above surfactants.Design/methodology/approachThe modified Vac-VeoVa10 copolymer nanometre latex modified VAc-VeoVa10 latex has been successfully synthesized via the semi-continuous seeded emulsion polymerization, which VAc and VeoVa10 is used as the main monomers and long fluorocarbon monomer was used as the functional monomer. Potassium persulphate (KPS) and the mixture of CO-436 and DBM were used as the initiator and emulsifier, respectively. The structure of resultant latex film was characterized by Fourier transform infrared spectroscopy (FTIR). The latex films were tested by thermogravimetric analysis, differential scanning calorimetry and contact angle. The particle size and its distribution of the latex were measured by the nano particle size analyzer.FindingsDetailed investigation was conducted on the factors influencing the properties of the latex and film. The stability of the resultant latex is good. The average particles of the latex and its distribution are small and uniform, respectively. In comparison with the conventional latex film, the thermal stability and hydrophobicity of the resultant latex film are improved obviously.Originality/valueThe modification ofp(VAc-VeoVa10) using a new emulsifier and long fluorocarbon monomer has not been widely reported. In this study, the modified Vac-VeoVa10 copolymer nanometre latex modified VAc-VeoVa10 latex has been successfully synthesized via the semi-continuous seeded emulsion polymerization, which VAc and VeoVa10 is used as the main monomers and long fluorocarbon monomer was used as the functional monomer. KPS and the mixture of CO-436 and DBM were used as the initiator and emulsifier, respectively.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of CO2 Utilization
·
2023
·
IF 7.7
Peilin Li,Jing Zhong,Wenzhong Ma,You Zhang,Xiuxiu Ren,Meng Guo,Yongfei Zhu
Carbon monoliths have the advantages of good heat resistance and no need for molding during use. However, in practical applications, due to its low strength, it often suffers from wear and breakage during multiple adsorption-desorption cycles, which is not conducive to CO 2 adsorption. Pyrogallol and formaldehyde-based polymers were used as carbon precursors, triblock copolymer Pluronic F127 was used as a structural directing agent, and diethylene glycolamine (DGA) as both the polymerization crosslinking agent and structural assembly promoter. In the presence of DGA, the solution can quickly gel within 15–20 min at 90 °C. No catalyst required, no environmental pollution, low cost, and mild reaction. Hydrogen bond interaction and poly(benzoxazine-co-resol) self-assembly synthesized homogeneous and crack-free polymer monoliths. A sturdy framework of carbon monoliths was obtained by adjusting the content of DGA and carbonization temperature. The kind of carbon monolith not only has a fully interconnected mesoporous structure and maintains good shape even after being magnified three times. The tight network skeleton enables it to have good mechanical strength and withstand a pressure of 8.1 MPa, which is 41 times greater than that of nano-casting and soft template carbon monoliths (0.19 and 0.2 MPa). The presence of nitrogen-containing groups and pore structures gives it good CO 2 capture ability (0.9–2.8 mmol/g, 1 bar, 298 K), superior to the regular mesoporous carbon prepared by soft and hard template methods (1.5 and 1.7 mmol/g). Meanwhile, it exhibits high selectivity for capturing CO 2 over N 2 from a 15% (v%) CO 2 /N 2 mixture. They undergo a facile CO 2 release in an argon stream at 25 °C, indicating a good regeneration capacity. After five testing cycles, the carbon monolith still maintained good adsorption and separation performance, with adsorption capacity maintained at 98–100% of the initial adsorption capacity.
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 THE ELECTROCHEMICAL SOCIETY
·
2018
·Vol. 165
·期 11
·A2415
·
IF 3.662
Lei Liu,Xinyu Fu,Guoxu Wang,Kehan Liang,Lili Zhang,Wei Wang,Aibing Chen
Carbon monolith is of particularly great interest in electrochemical applications due to its high surface area, controllable morphology and excellent electronic conductivity. Herein, a novel three-dimensional hierarchically porous carbon monolith (TD-HPCM) was synthesized by a "pyrolysis-capture" strategy. The commercial polyurethane (PU) foam concurrently acted as a template and carbon precursor. Carbonaceous organic gas pyrolyzed from PU foam was captured by mesoporous silica which coated on the branches of PU foam uniformly then converted into carbon under catalysis of Ni species at high temperature. The geometric shape and interconnected network of PU foam were preserved in TD-HPCM, with a large specific surface area (1111 m2 g−1) and uniform mesoporous size (6.7 nm). The TD-HPCM was explored as binder-free electrode in supercapacitors, with capacitance up to 162 F g−1 at 1.0 A g−1 in 6 M KOH electrolyte and favorable capacitance retention (92.7% capacitive retention after 5000 cycles). This strategy provides a controllable, energy efficient and highly repeatable method to prepare TD-HPCM with micro/meso/macroporous structures as binder-free electrodes in electrical double layer capacitors.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2020
·
IF 5.715
Qingshan Fu,Lei Zhang,Haifei Zhang,Xuedan Chen,Mingtian Li,Min Gong
Various nanoporous particles, nanofibers have been employed for adsorptive removal of dyes from wastewater. However, these nanomaterials are difficult in separation from solution, generally by centrifugation or filtration. These processes are tedious and will limit the upscale applications. Herein, a hierarchically porous carbon monolith has been fabricated on grounds of ice and metal organic framework (MOF) templating method. The prepared carbonaceous monolith exhibited abundant ice-templated macropores , MOF-templated micropores and mesopores, and a high BET (Brunauer-Emmett-Teller) special surface area (530 m 2 g −1 ). The monolith achieved an MB (methylene blue) adsorption capacity of 95.82 mg g −1 (10 mg adsorbent/5 mL aqueous dye solution) and a theoretic maximum value of 179.86 mg g −1 by the Langmuir model. Compared with MB, the adsorption capacity for MO (methyl orange) was lower. Several adsorption kinetics and isotherms models were used for analysis of adsorptive data, and the results demonstrated the adsorption of MB and MO on the porous carbon monolith is a spontaneous endothermic physisorption process, which was mainly controlled by electrostatic reaction. Importantly, the monolith could be easily picked up using tweezers and used for recycling tests. After four cycles, the 94% of the initial adsorption capacity for MB can be retained.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FlatChem
·
2021
·
IF 5.227
Xiu Lin,Qi-Yuan Li,Dong Xu,Lu-Sha Gao,Guang-Yao Zhai,Shi-Nan Zhang,Peng Gao,Jie-Sheng Chen,Xin-Hao Li
Designing functional and reusable electrode materials to replace homogeneous versions of scarifying additives or mediators in electrochemical organic synthesis is of great importance for both the fundamental academics and practical production of various useful compounds. Herein, we rediscover the function of nitrogen-doped carbon monoliths (N x C) as de novo anode materials to trigger a new reaction path for the synthesis of acetals from the direct coupling of alcohols without the assistance of any mediator, oxidant, acid, or organic ligand. The lowered valence bands of carbon monoliths induced by doping nitrogen are of key importance for polarizing and activating the pre-adsorbed O–H groups of benzyl alcohol molecules to boost the high Faradaic efficiency (71% at 1.8 V versus Ag/AgCl) and reusability of N x C anodes, meeting the requirements of green chemistry.
研究领域:
材料科学
·
电化学
·
有机合成
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Peng Song,Caixia Chen,Xiaoping Shen,Shiping Zeng,S. Premlatha,Zhenyuan Ji,Linzhi Zhai,Aihua Yuan,Qi Liu
Wood-derived carbon monoliths, in recent years, have attracted tremendous interest in the field of energy storage, but their electrochemical characteristics are still far from satisfactory. Here, we report a universal and efficient approach for the preparation of structure-engineered, heteroatom-functionalized and property-boosted wood carbons. A two-step ion-exchange process greatly enriches the nucleation sites of ZIF-8 on the inner wall of wood tracheids, hence leading to a unique carbon/carbon heterostructure after carbonizing and acid-washing. Particularly, the prepared NPCM-900 with a large specific surface area of 708.2 m 2 g −1 , a hierarchical porous architecture and a suitable N content of 2.3% delivers an ultrahigh area-normalized specific capacitance of 23.7 F cm −2 at 5 mA cm −2 , which stands for a new capacitive record among the wood-based binder-free electrodes. The NPCM-900//NPCM-900 all-solid-state supercapacitor has an admirable energy density of 9.3 Wh m −2 at 24.9 W m −2 and a large power density of 248.3 W m −2 at 4.8 Wh m −2 , while the NPCM-900 based Zn-ion hybrid supercapacitor (NPCM-900//Zn) exhibits a superior energy density of 12.7 Wh m −2 . Furthermore, the NPCM-900//NPCM-900 and NPCM-900//Zn present great stabilities with capacitance retentions of 87% and 85%, respectively, after 5000 cycles. These parameters notably outperform those of most wood-based supercapacitors, endowing the NPCM-900 with extensive prospects for practical use.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBON
·
2024
·
IF 10.5
Yuchao Wang,Hongmin Wang,Benjing Li,Peng Han,Guicun Qi,Dali Gao,Zeqi Wei,Shengyang Tao
Monolithic carbon with hierarchically porous structure has a promising prospect for a wide range of applications in the fields of energy, environment, catalysis, etc. Due to the reliance on the utilization of templating agents, conventional preparation approaches often suffer from time-consuming preparation, complex post-processing, and uneconomical cost. Herein, we develop a novel strategy to match the sol-gel transition with the phase separation process for the direct preparation of hierarchically porous carbon monolith (HPCM) without templating agent. Resorcinol and resol are employed as carbon sources to adjust the polymerization for the formation of bi-continuous microstructure. Well-defined hierarchical pores and large specific surface area for fast mass diffusion enable the HPCM to be a prospective kind of electrode material in supercapacitor with an outstanding specific capacitance over 350 F g −1 (1.0 A g −1 ). After facile sulfonation, the modified HPCM can act as solid acid catalyst to realize a high-performance production of 5-hydroxymethylfurfural (5-HMF) in a 90 % yield with turnover frequency (TOF) value up to 155.9 h −1 . Additionally, HPCM also exhibits an excellent Joule heating effect, which can be applied to the thermal management after compounding with phase change materials. The desirable integrated performance enables HPCM to be a valuable material suitable for various applications.
研究领域:
材料科学
·
能源化学
·
催化化学
✓ 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）