AICHE JOURNAL
·
2021
·Vol. 67
·期 9
·e17281
·
IF 3.993
Ze Dong,Bei Li,Hua Shang,Peixin Zhang,Shixia Chen,Jiangfeng Yang,Zheling Zeng,Jun Wang,Shuguang Deng
The adsorptive separation of CH 4 from low-grade coal-bed gas can be performed at decentralized and remote coal mines, and it uses more energy- and is cost-efficient than the traditional cryogenic distillation process. Herein, we present a facile method to prepare ultramicroporous carbon granules with a narrow pore-size distribution at 0.5–0.6 nm. To our knowledge, such centered and uniform pore-size distribution in carbon granules has never been reported. The carbon granules can be directly utilized in adsorption columns without a granulation or pelletization process. The granular oil-tea-shell-derived porous carbon (GOC-2) exhibited a record-high CH 4 uptake of 1.82 mmol/g and CH 4 /N 2 selectivity of 5.8 at 1.0 bar and 298 K among carbon granules. The excellent CH 4 /N 2 separation performances were confirmed from the results of dynamic breakthrough experiments and pressure swing adsorption simulations. This work provides a novel strategy for developing ultramicroporous carbon granules and guides the future design of efficient CH 4 /N 2 separation adsorbents.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Energy
·
2022
·
IF 9.257
Xiaochun Hu,Yuqing Luo,Xianyue Wu,Jiabin Niu,Mingwu Tan,Zhiqiang Sun,Wen Liu
Heteroatom-doped microporous carbon nanosheets (HMCNs) are used in a wide range of applications, including gas adsorption, energy storage, and catalysis. Here, we demonstrate a solvent-free, template-free, one-pot polycondensation approach for the synthesis of HMCNs using melamine (MEL) and pentaerythritol (PER) as precursors. By varying the ratio of MEL to PER and the pyrolysis temperature, the doping amount, surface area and porosity of the HMCNs can be controlled. When used for CO 2 capture, the HMCN synthesized by the pyrolysis of a 3:2 mixture of MEL and PER at 900 °C (3/2-HMCNs-900) affords a CO 2 uptake of 5.35 mmol g −1 at 273 K and 1 bar CO 2 partial pressure. Density functional theory calculations suggest that the high CO 2 uptake performance of the HMCNs is associated with the chemical modification of the surface, as a result of N- and O- co-doping. When assembled in a supercapacitor , 3/2-HMCNs-900 exhibits a high specific capacitance (475 F g −1 at 1.3 A) and a fast charge-discharge rate of 13.3 F s −1 g −1 . This study presents a novel, resource-efficient and environmentally friendly method for preparing HMCNs for energy and environmental applications.
研究领域:
材料科学
·
能源与环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Materials Au
·
2025
·
IF 6.5
Man Liu,Weiwei Shi,Huili Liu,Yanzhen Guo,Baocheng Yang,Binbin Chang
Carbon capture has emerged as a pivotal carbon neutrality technology for addressing greenhouse effect challenges. Porous carbons are one of the most promising adsorbents for CO2 capture and separation from flue gas, yet their traditional synthesis necessitates inert atmospheres to avoid oxidation, which greatly restricts the large-scale production at a low cost and advanced industrial applications. Herein, we propose an innovative pathway for large-scale fabrication of porous carbons via one-step pyrolysis in an air environment. Porosity and surface chemistry can be concurrently tailored by controlling the air-assisted pyrolysis process, and the optimization mechanism is unveiled in detail. The resultant materials feature well-interconnected hierarchical porosity with highly proportioned ultramicroporosity, uniform spherical morphology, and high surface heteroatom doping levels. By leveraging porosity and surface chemistry, the optimal sample exhibits superior CO2 capture behaviors of satisfactory CO2 uptake and ultrahigh selectivity. CO2/N2 selectivity reaches up to 160 at 0.15 bar and 25 °C, and it still achieves up to 76 at 1.0 bar and 25 °C, ranking it in the top 5% of the reported porous carbons. We explore the correlations between porosity, surface heteroatoms, and CO2 capture behaviors. Porosity has a decisive function on CO2 capture capacity and selectivity, especially ultramicroporosity, and surface heteroatoms doping could have a positive promotion in selectivity caused by extra CO2-philic sites. This work pioneers a feasible approach for large-scale directional design of functional porous carbons through air-assisted pyrolysis under mild conditions.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Weiwei Shi,Quanqi Zhang,Shiji Liu,Suisui Su,Binbin Chang,Baocheng Yang
The superior ultramicroporosity and enriched surface CO 2 -philic sites are simultaneously required features for high-efficiency carbon-based CO 2 adsorbents. Unfortunately, these characteristics are usually incompatible and difficult to integrate into one porous carbon material. Herein, we report a new copper ions (Cu 2+ )-assisted dynamic porogen to construct hierarchically microporous carbon nanosheets in a large scale with high heterogeneity for solving such issue. Cu 2+ can be equably dispersed in precursor by coordination interactions of COO-Cu and Cu-N, which can anchor more N/O-containing species in final product. The reduced cuprous ions (Cu + ) in pyrolysis process functions as a dynamic porogen to tailor uniform ultramicropores. Importantly, copper salt extracted in this synthetic procedure allows cyclic utilization, realizing a green and low-cost process. The obtained carbon sheets possess a graphene-like morphology, a high surface area and a high-proportioned multiscale microporosity , especially a high-density ultramicropores of 0.4–0.7 nm and supermicroproes of 0.8–1.5 nm. The maximized synergistic effect of morphology, high density of multi-sized ultramicroporosity and surface high heterogeneity endow the resultant microporous carbon nanosheets with the remarkable CO 2 capture property, including a high uptake, a moderate adsorption heat, a good selectivity and superior recyclability.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Hongwei Zhao,Lixiang Li,Yuanyuan Liu,Xin Geng,Haiming Yang,Chengguo Sun,Baigang An
A simple one-step CVD of acetonitrile vapor was successfully used to prepare nitrogen-doped ordered microporous carbon, where zeolite template was silanized to improve activity of carbon deposition into pore walls of the zeolite, CVD time was used to adjust microstructure and nitrogen containing species. XRD, N 2 adsorption isotherms, SEM, TEM and XPS were used to characterize the composition, microstructure, specific surface area (SSA)/pore distribution and chemical state of nitrogen-doped zeolite-templated carbons (N-ZTCs). Electrochemical tests were carried out to analyze the performance of samples as ORR catalyst. The results show that the N-ZTC as prepared at 750 °C with CVD time of 4 h (N-ZTC-4h) owns ordered micropores, large SSA and abundant nitrogen containing functional groups. As metal free catalyst, N-ZTC-4h exhibits high current density of ORR, good durability and excellent methanol tolerance. Good catalytic ORR performance of N-ZTC-4h is owed to a large quantity of nitrogen containing species with a high ratio of pyridinic-N and quaternary-N owning activity of ORR and the ordered microporous distribution in three-dimensions for mass transport. Easy preparation process and control method of pore structure and nitrogen containing species of N-ZTCs makes it have a big potential in developing nitrogen doped carbon based catalysts of ORR.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-17
·
IF 12.264
Ding Chenfeng,Liu Tianyi,Yan Xiaodong,Huang Lingbo,Ryu Seungkon,Lan Jinle,Yu Yunhua,Zhong Wei-Hong,Yang Xiaoping
An ultra-microporous carbon material simultaneously with high specific surface area (1554 m 2 g −1 ) and packing density (1.18 g cm −3 ) is designed and fabricated.
The resulting carbon material integrates the high gravimetric and volumetric capacitance (430 F g −1 and 507 F cm −3 at 0.5 A g −1 ) and thereof provides the robust all-solid-state cellulose supercapacitor with high areal and volumetric density.
研究领域:
材料科学
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能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Sustainable Energy & Fuels
·
2022
·Vol. 6
·期 13
·3208-3219
·
IF 6.813
Wei Hui,Xin-Yi Xu,Fei-Feng Mao,Ling Shi,Hai-Jun Wang
Porous carbon materials have shown great promise for the efficient capture and conversion of atmospheric CO2, but remain challenging. In this work, activated N/O-rich multilayer ultramicroporous carbon materials for the effective capture and conversion of atmospheric CO2 have been generated using a simple one-step method. Notably, the developed catalyst has a multilayered ultramicroporous framework and double N/O heteroatoms as active sites, which capture and activate atmospheric CO2 for the cycloaddition reaction simultaneously, obtaining 96% yield of cyclic carbonate. Additionally, the stable recyclability of the catalyst highlights the sustainability of the efficient conversion of CO2 to cyclic carbonates under mild conditions. Meanwhile, the low isosteric heat of CO2 adsorption is measured to be around 14.8–19.1 kJ mol−1, which means that the energy consumption of the CO2 desorption process would be quite low in industrial application. We believe that this work has tremendous potential for industrial CO2 capture and conversion into high-value-added products.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Batteries & Supercaps
·
2023
·Vol. 6
·期 7
·e202300145
·
IF 5.7
Mengmeng Liu,Yan Zhang,Zhao Xu,Xuguang Han,Wenshan Gou,Yifei Sun,Chang Ming Li
Graphical Microporous biomass carbon : The Enteromorpha-derived nitrogen-doped highly microporous carbon (HMCs) was prepared by carbonization and activation. Due to the high specific surface area, rich pore structure and nitrogen doping of HMCs, HMCs-3@S/SeS 2 cathode exhibits excellent cycling stability and rate performance in aqueous Zn-chalcogen batteries. Rechargeable aqueous zinc-chalcogen batteries have become a rising star in the energy storage systems due to the high abundance, low cost and high theoretical specific capacity of the chalcogen cathodes (S, Se). However, there are still some challenges in its practical application, such as low utilization of active substances due to the poor conductivity of chalcogen and sizable volume changes during charging/discharging. In this work, for the first time, nitrogen-doped highly microporous biomass-derived carbon (HMCs-3) was synthesized as a sulfur-loaded cathode for aqueous zinc-chalcogen batteries. A high specific surface area (3349.4 m 2 g −1 ) and a wealthy micropore of HMCs-3 provide enough space to load the active substances and allow electrolytes to access reaction sites while well alleviating the volume changes of sulfur during the cycling process. As a cathode for aqueous zinc-chalcogen batteries, HMCs-3@S delivers a high reversible discharge capacity (591 mAh g −1 at 0.1 A g −1 ), an excellent rate capability (477 mAh g −1 at 3 A g −1 ) and good cycling stability (559 mAh g −1 after 100 cycles at 1 A g −1 ). The excellent performance of this biomass-derived carbon holds great promise for practical applications in aqueous zinc-chalcogen batteries.
研究领域:
材料科学
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储能系统
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2015
·
IF 4.513
Juan Zheng,Kun Wang,Erlun Luo,Dingcai Wu,Fang Zhu,Ruifen Jiang,Chengyong Su,Chaohai Wei,Gangfeng Ouyang
The monodisperse microporous carbon nanospheres (MMCNSs) were applied in solid phase microextraction for the first time. The MMCNSs-fiber was prepared by sol–gel technique and good repeatability and reproducibility were obtained, due to the excellent monodispersity of the MMCNSs . The sol–gel-MMCNSs fiber exhibited superior extraction ability for polycyclic aromatic hydrocarbons (PAHs) and organochlorine pesticides (OCPs), compared with the commercial polydimethylsiloxane/divinylbenzene (PDMS/DVB) fiber and the fiber prepared with its precursor, the monodisperse microporous polystyrene nanospheres (MMPNSs). Moreover, the fiber has good thermostability and strong acid/base durability. The sol–gel-MMCNSs fiber was then employed to detect PAHs and OCPs in aqueous samples by combining with gas chromatography–mass spectrometer (GC–MS). Under the optimized conditions, the detection limits of the proposed method ranged from 0.10 to 5.5 ng L −1 . Furthermore, the method was successfully utilized for the analysis of PAHs and OCPs in real samples, with satisfactory recoveries in the range of 81.0–120% for the Pearl River water samples and 72.8–118% for the coking wastewater samples.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Xiangfeng Zhao,Pengfei Liu,Jianglin Xu,Sulu Sheng,Lihui Jia,Zhimin Chen
Hierarchical porous carbon is an ideal electrode material in the electrochemical energy storage, but the relatively single distribution of micropores has poor universality for different electrolytes, especially for the electrolytes with large ion sizes. Herein, a simple strategy for enhancing the electrochemical performance of biomass-based porous carbon by constructing hierarchical nano micropores is developed, using NH 4 Cl as in-situ catalytic dehydration agent of high molecular polysaccharide polymer, and ZnCl 2 as synergistic dehydration activator. The hierarchical nano micropores greatly improves the capacitance, rate performance, and electrochemical stability of corn straw-derived porous carbon in KOH, Na 2 SO 4 and ZnSO 4 electrolytes. In 1 M Na 2 SO 4 system with large-sized ion, the specific capacitance of CSPC-N-850 electrode can increase from 124.4 to 260.4 F g −1 , the rate performance increase from 63.8 % to 80.4 %, and without capacity degradation in ultra-high current density of 10 A g −1 after 100,000 charge/discharge cycles. In addition, CSPC-N-850 electrode also exhibits excellent electrochemical performances in zinc ion hybrid capacitor with a high specific capacity of 135.7 mAh g −1 at 0.2 A g −1 , good energy density of 99.6 Wh kg −1 at the power density of 412.1 W kg −1 , and 100 % of capacitance retention after 5000 cycles at 1 A g −1 .
研究领域:
材料科学
·
电化学能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Zihao Li,Xiaogang Li,Youhao Liao,Xiaoping Li,Weishan Li
We report a novel composite of sulfur loaded in micropore-rich carbon aerogel (CA-S), as cathode of lithium-sulfur battery. Carbon aerogel (CA) is synthesized through phenol-formaldehyde reaction with a low catalyst concentration and carbonization under high temperature, and loaded with sulfur via chemical deposition and heat treatment. The physical properties of the resulting CA and the electrochemical performances of the resulting CA-S are investigated by scanning electron microscopy, thermal gravimetric analysis , Brunauer-Emmett-Teller characterization, electrochemical impedance spectroscopy , and galvanostatic discharge/charge test, with a comparison of a common carbon material, acetylene black (AB), and sulfur loaded in AB (AB-S). It is found that the CA is micropore-rich with micropore volume over 66% of total pore volume , and the CA-S exhibits significantly improved cyclic stability compared with AB-S. The improved performance of CA-S is attributed to the confinement of the micropores in CA to small sulfur allotropes and corresponding lithium sulfides.
研究领域:
电化学
·
能源材料
·
纳米材料
·
储能技术
✓ 已验证
DOI
高影响因子
Small
·
2018
·Vol. 14
·期 11
·1703279
·
IF 9.598
Qian Wang,Minghui Yang,Zhen-Bo Wang,Chao Li,Da-Ming Gu
Shuttle effect of the dissolved intermediates is regarded as the primary cause that leads to fast capacity degradation of Li–S battery. Herein, a microporous carbon-coated sulfur composite with novel rambutan shape (R-S@MPC) is synthesized from microporous carbon-coated rambutan-like zinc sulfide (R-ZnS@MPC), via an in situ oxidation process. The R-ZnS is employed as both template and sulfur precursor. The carbon frame of R-S@MPC composite possesses three kinds of pores that are distinctly separated from each other in space and are endowed with the exclusive functions. The central macropore serves as buffer pool to accommodate the dissolved lithium polysulfides (LPSs) and volumetric variation during cycling. The marginal straight-through mesoporous, connected with the central macropore, takes the responsibility of sulfur storage. The micropores, evenly distributed in the outer carbon shell of the as-synthesized R-S@MPC, enable the blockage of LPSs. These pores are expected to perform their respective single function, and collaborate synergistically to suppress the sulfur loss. Therefore, it delivers an outstanding cycling stability, decay rate of 0.013% cycle −1 after 500 cycles at 1 C, when the sulfur loading is kept at 4 mg cm −2 .
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
功能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）