Scientific Reports
·
2016
·Vol. 6
·期 1
·1-9
·
IF 5.228
Kong Lingjun,Liu Mingxiang,Diao Zenghui,Chen Diyun,Chang Xiangyang,Xiong Ya
Hierarchical nanoporous carbon (NPC) with great surface area and developed pore size distribution has been intently concerned. Herein, we report a facile method coupling template nanocasting and self-activation to fabricate nanoporous carbon with continuous micro, meso and macro pores, in which CaCO 3 acted as template and activation reagent while the flour was the carbon precursor. Effects of mass ratio of CaCO 3 to flour and carbonized temperature on the pore structures of NPC were investigated by nitrogen adsorption-desorption isotherms and SEM analysis. Another kind of carbon was prepared by directly mixed powder CaCO 3 with flour carbonized at 800 °C (NPC-p) to comparatively investigate the pore fabricating mechanism. Results shown that carbonized at 800 °C was favorable to fabricate the continuous macro, meso and micro pores. The resulted NPC in a mass ratio of 1 to 2 had the considerable S BET and V T of 575.4 m 2 /g and 0.704 cm 3 /g, respectively. Only surface activation was observed for NPC-p. Nanocasting of the powder CaCO 3 contributed to fabricate macropores and the CO 2 activation contributed to meso- and micropores. Coupling activation and nanocasting effect due to the decomposition of CaCO 3 template into CO 2 and CaO was ascribed to synthesize the nanoporous carbon.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Jiangdong Dai,Sujun Tian,Yinhua Jiang,Zhongshuai Chang,Atian Xie,Ruilong Zhang,Yongsheng Yan
It is still a big challenge to obtain porous carbons for antibiotics removal by simple methods. Here, we reported a facile, cost-effective and one-pot approach for preparation of porous carbon sheets via in-situ template and self-activation using potassium acetate as single precursor. The optimal porous carbon was prepared at reaction temperature of 900 °C to obtain the highest BET surface area of 2358.57 m 2 g −1 with equilibrium adsorption capacity of 588.24 mg g −1 for chloramphenicol (CAP) at 298 K . The adsorption ability of this highly porous carbon was far higher than most adsorbents mentioned in previous literature. Meanwhile, adsorption equilibrium could achieve rapidly within 250 min. The Langmuir isotherm model and pseudo-second-order kinetic model were well fitted to adsorption experimental data. Significantly, the adsorbent exhibited excellent stability and regeneration performance after four times cycles. The high adsorption capacity, fast kinetic, chemical stability and regeneration ability of this porous carbon make it a candidate for antibiotics removal in wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 22
·12204-12210
·
IF 2.936
Hanwei Wang,Chengmin Sheng,Tailong Cai,Chunde Jin,Qingfeng Sun,Chao Wang
In this study, N-doped mesopore-dominant carbon (NMC) materials were prepared using bio-waste tortoise shells as a carbon source via a one-step self-activation process. With intrinsic hydroxyapatites (HAPs) as natural templates to fulfill the synchronous carbonization and activation of the precursor, this highly efficient and time-saving method provides N-doped carbon materials that represent a large mesopore volume proportion of 74.59%, a high conductivity of 4382 m S−1, as well as larger defects, as demonstrated by Raman and XRD studies. These features make the NMC exhibit a high reversible lithium-storage capacity of 970 mA h g−1 at 0.1 A g−1, a strong rate capability of 818 mA h g−1 at 2 A g−1, and a good capacity of 831 mA h g−1 after 500 cycles at 1 A g−1. This study provides a highly efficient and feasible method to prepare renewable biomass-derived carbons as advanced electrode materials for the application of energy storage.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Jing Li,Yang Yang,Ni Liang,Xi Wang,Xiong Tong,Bo Pan
In this study, we propose a simple and sustainable strategy to fabricate hierarchical porous graphitic carbon (HPGC) through the direct pyrolysis of banana peduncle, in which the naturally occurring potassium-rich components allow it to act as carbon source, template, and self-activator all in one. During pyrolysis, the formation of KCl and K 2 CO 3 enabled simultaneous carbonization and self-template/self-activation of banana peduncle, eliminating the need for exogenous chemicals. The resulting HPGC exhibited high graphitization, hydrophobicity, and a large specific surface area of 1686.30 m 2 g −1 , with a hierarchical pore structure dominated by micropores (peaking at 0.86 nm) and narrow mesopores (<4.0 nm). HPGC achieved exceptional sorption capacities of 730.63 and 833.44 mg g −1 for dimethyl phthalate and diethyl phthalate, respectively, within 2 h, significantly outperforming most reported sorbents. The superior performance is attributed to the developed pore structure and large surface area, which provided abundant sorption sites through pore-filling and surface coverage. Meanwhile, the hydrophobic π-conjugated carbon framework of HPGC facilitated the sorption via hydrophobic effects, π-π electron donor–acceptor interactions, and π-π stacking. Additionally, hydrogen bonding may be involved, but with minor contribution. Thermodynamic parameters indicated that the sorption process was spontaneous and exothermic, driven primarily by hydrophobic effects, resulting in an entropy gain in systems. The stronger sorption of diethyl phthalate compared with dimethyl phthalate was attributed to stronger hydrophobic interaction with HPGC. This work highlights a novel, cost-efficient, and environmental-friendly approach to synthesizing high-performance porous carbon for phthalate easters removal, offering significant potential for large-scale applications in water remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Biomass Conversion and Biorefinery
·
2025
·
IF 4.1
Zhao Xiaoben,He Tao,Wang Shuainan,He Song
In this research, nitrogen-doped activated carbons (NACs) featuring a high specific surface area (3396 m 2 /g) and a certain amount of nitrogen doping (0.79–1.69%) were prepared by a combination of chemical activation and self-activation methods, and their CO 2 adsorption characteristics were comprehensively assessed. The experimental results showed that nitrogen doping not only significantly enhanced the specific surface area of the materials, but also significantly enhanced the CO 2 adsorption. The CO 2 adsorption capacity of the optimal sample, CMAC-0.5–3-700, reached 4.11 mmol/g and 2.32 mmol/g at 0 °C and 25 °C, respectively. In addition, the selectivity of NACs for CO 2 /N 2 was significantly improved, with a selectivity factor of up to 50.16, and the competitive adsorption experiments also demonstrated that NACs could still effectively adsorb CO 2 under the condition of CO 2 /N 2 = 15/85. Density-functional theory (DFT) calculations further revealed the interaction mechanism between NACs and CO 2 molecules, the enhanced CO 2 selectivity is attributed to electrostatic and π-electron interactions between nitrogen atoms and CO 2 . The findings indicate the significant potential of nitrogen-doped activated carbons (NACs) with high specific surface area and substantial nitrogen doping for post-combustion CO 2 capture.
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
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Weimin Chen,Min Luo,Chaozheng Liu,Shu Hong,Xin Wang,Pei Yang,Xiaoyan Zhou
As ZnCl 2 is a good microwave absorber, it was usually used as an porogen to produce porous carbon from biomass by microwave heating . In this study, a facile microwave self-activation with the absence of ZnCl 2 was proposed to produce chitosan-hydrogel-bead-based porous carbons (CPC-Air) for a short duration of 10 min. KOH was used as a substitute for the typically used NaOH to form chitosan-based hydrogen beads. During microwave irradiation , KOH acted as a chemical porogen to generate abundant micropores with a pore volume of 0.39 cm 3 g −1 in CPC-Air, while water wrapped in hydrogel beads was transformed into steam, serving as a physical porogen to form a considerable content of mesopores (41.8%) and creating a air-free atmosphere. Microwave irradiation led to fast pyrolysis of chitosan, generating meso-/macropores. Combined with self-activation process, it resulted in a high defects degree in CPC-Air. Nitrogen with a high content of 3.4% remained in CPC-Air after self-activation. In addition, a significantly high oxygen content of 17.5% was introduced by the post-oxidation in air atmosphere. Consenquently, the proposed approach can produce a hierarchical and O, N co-doped CPC material with a high defects degree at air-free atmosphere, and with comparable electrochemical properties but with much simpler process and less production duration than the conventional method using ZnCl 2 . Particularly, owing to the combined effects of those characteristics in CPCs, an excellent rate capability was achieved in the prepared electrode, demonstrating an ultra-high capacitance retention of 87.5% when the current load was increased from 0.5–10 A g −1 . The supercapacitor prepared by this electrode can deliver the energy densities of 17.3–20.6 W h kg −1 and the power densities of 0.5–9.0 kW kg −1 .
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Qi Gao,Liangmeng Ni,Shaowen Rong,Shushu Liu,Yanhang Zhong,Zhijia Liu
This work developed a method using bamboo shoot shells as raw material to produce Fe-modified ACs combining self-activation and chemical modification. Adding small amounts (0.5–5 %) of K 2 FeO 4 accelerated the pyrolysis process and CO 2 release, and reduced the activation energy and temperature of self-activation reaction. This increased the reaction rate and activation efficiency, ultimately significantly improving the pore structure of ACs. The addition of 3 % K 2 FeO 4 resulted in a substantial increase in specific surface area and pore volume of AC, from 1340 m 2 /g and 0.72 cm 3 /g to 2184 m 2 /g and 1.34 cm 3 /g, respectively. Additionally, the introduction of K 2 FeO 4 also enabled iron doping on the surface of the ACs. The improvement of pore structure and iron doping further enhanced the adsorption performance of ACs. The adsorption capacities of ACs for arsenate, ibuprofen, and tetracycline were up to 1.64, 1.50, and 2.38 times higher, respectively, than those of ACs prepared through conventional self-activation.
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
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Dongming Wang,Hao Dong,Dongyang Zhang,Chen Wang,Keren Lu,Mingxing Shi,Guolin Tong
Currently, it is a huge challenge to develop a rapid and sustainable approach to prepare N/S co-doped mesoporous-dominated hierarchical porous carbons (NSMHPC) for supercapacitors. Herein, we innovatively adopted an in-situ template-assisted self-activation strategy to exploit multiple X-NSMHPCs (X = A, M, N) from different sulfate (Al 2 (SO 4 ) 3 /MgSO 4 /(NH 4 ) 2 SO 4 ) precipitated kraft lignins (X-KLs, X = Al, Mg, NH 4 ). Compared with other X-NSMHPCs, N-NSMHPC delivered unique mesoporous-dominated hierarchical structures with excellent specific surface area (S BET ) of 622.1 m 2 /g, large pore volume (V pore ) of 0.61 m 3 /g, copious N/S content and high carbon yield of 32.8 %. Its unique tertiary pore structure and plentiful surface-exposed active sites facilitated rapid electrolyte penetration, and speedy ion insertion and extraction. As expected, N-NSMHPC delivered a superior specific capacitance of 226.6 F/g at 0.5 A/g, which was much higher than that of lignin-based or biomass-direct pyrolyzed-based PCs. When assembled as a symmetric supercapacitor, N-NSMHPC demonstrated a maximum energy density of 18.7 Wh/kg and a power density of 500 W/kg. Meanwhile, it only exhibited a 6.6 % specific capacitance drop at 20 A/g after 5000-cycle charge-discharge tests. This span-new strategy provides a green and efficient sight for designing high-yield-high performance NSMHPC for supercapacitors.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 40
·405401
·
IF 3.953
Chenzhi Wu,Tong Wu,Zhenbin Tang,Juguo Dai,Birong Zeng,Yiting Xu,Guorong Chen,Weiang Luo,Conghui Yuan,Lizong Dai
We report a simple metal ion-catechol coordination strategy to coat ruthenium-catechol polymer complex (TAC-Ru) on the surface of carbon nanotubes (CNT) to form a core–shell structure (abbreviated as CNT@TAC-Ru). This is achieved by firstly polymerizing catechol and boronic acid monomers on the surface of CNT to form a boronate ester polymer (BP) shell. Then, Ru3+ is used to etch the BP shell, and cleave the dynamic boronate ester bond, leading to the formation of a CNT@ruthenium-catechol coordination complex based on the coordinative efficiency of the catechol group. The electrocatalytic property of the CNT@TAC-Ru composite can be activated through electrochemical cycling treatment. The as-activated CNT@TAC-Ru exhibits evidently improved hydrogen evolution reaction (HER) performance with an overpotential of 10 mV in 1.0 M KOH at a current density of 10 mA cm−2 , which is better than that of commercial Pt/C (32 mV). And the long-term stability is also desirable. This work provides a pyrolysis-free method to form metal-polymer-carbon composite with high HER performance under the alkaline condition.
研究领域:
材料科学
·
电化学
·
能源转化与储存
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Liye Ni,Guangjie Yang,Chenweijia He,Tiancheng Lan,Shuijian He,Haoqi Yang,Nan Wu,Rulan Chen,Li Liu,Fangdi Wu,Qian Zhang
The preparation of porous carbon is constrained by the extensive use and detrimental impact of activators and dopants. Therefore, developing green and efficient strategies that leverage the intrinsic properties and pretreatment of the materials to achieve self-activation and self-doping is particularly crucial for porous carbon materials. Herein, potassium histidine was utilized as the molecular salt precursor, attaining the efficient and streamlined preparation of porous carbon through a one-step carbonization process that enables self-activation, self-doping, and self-templating. More interestingly, the carbonization temperature significantly impacts the porous structure of the molecular salt precursors, the properties of the heteroatoms, and electrochemical performance. The designed electrodes exhibit high accessibility to electrolyte ions and effective ion-electron transport channels. Therefore, the optimal carbon material (KHis800) has an excellent mass-specific capacitance of 305.2 F g–1 at 0.2 A g–1, and a high capacitance retention rate of 115.6% (50,000 cycles at 5 A g–1). Notably, KHis800 also shows a maximum energy density of 19.6 Wh kg–1. This research is dedicated to exploring a more efficient preparation method for porous carbon material via molecular salts, offering insights for the sustainable development of carbon materials.
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
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 18
·185403
·
IF 3.874
Dewei Wang,Guoxian Chen,Zhongmou Pan
Aqueous zinc-ion hybrid supercapacitors are considered to be a newly emerging electrochemical energy storage devices. However, the exploration and design of advanced cathode materials remain a huge challenge. Herein, we developed a versatile one-step magnesiothermic reduction and self-activation process for the synthesis of highly-curved carbon nanosheets (HCCNs) with hierarchical pore structures. In this process, low-molecular weight organic potassium salts (e.g. potassium bitartrate, potassium acetate, potassium oxalate, potassium formate, potassium oleate, potassium sorbate), which usually used as the chemical activating reagents, serve as the carbon source whereas the Mg power acts as the reducing agent. The resulting HCCNs possess hierarchical porosity and unique HCCN geometry which can afford abundant active sites for charge accumulation as well as the highly efficient ions diffusion kinetics. Because of the high ratio of surface-controlled capacitive contribution and high ions diffusion coefficient, the optimized sample can exhibit excellent charge storage performance with an impressive reversible capacity (200.2 mAh g–1), excellent rate capability, and good cyclic stability. The excellent capacitive behaviors combined with the feasible synthetic procedure make the present synthetic protocol a promising choice towards well-designed nanocarbons for electrochemical energy storage applications.
研究领域:
材料科学
·
电化学储能
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Shukai Yu,Ning Sun,Longfeng Hu,Le Wang,Qizhen Zhu,Yibiao Guan,Bin Xu
Hierarchical porous texture is regarded as an ideal design for carboneous electrode materials of supercapacitors as it can present both high capacitance and good rate performance. Here, we propose a very simple and effective strategy to prepare nitrogen-doped, hierarchical porous carbons by direct pyrolysis of ethylenediamine tetraacetic acid disodium zinc salt, which plays multi-roles of carbon precursor, nitrogen source, hard template and activation agent all in one. During the pyrolysis process, ethylenediamine tetraacetic acid disodium zinc salt is firstly decomposed to a composite of nitrogen-doped carbon, nano-ZnO and Na 2 CO 3 particles. The nano-ZnO and Na 2 CO 3 particles are evenly embedded in the carbon matrix, acting as hard templates to create mesopores. Furthermore, the nano-ZnO also contributes to micropore creation as an activation agent at further increasing temperature. As a result, the nitrogen-doped, hierarchical porous carbons are easily obtained. The large surface area (1368 m 2 g −1 ) and high nitrogen content (6.71 at%) enable the carbon prepared at 700 °C exhibits a high capacitance of 275 F g −1 and excellent rate capability (207 F g −1 at 100 A g −1 ) in 6 mol L −1 KOH aqueous electrolytes , indicating a promising candidate as a carbon electrode material for supercapacitors.
研究领域:
材料科学
·
能源存储
✓ 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）