JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 55
·期 5
·2052-2067
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IF 3.442
Hu Lijun,Qian Zhengxin,Gao Wei,Wang Xiufang,Tian Yong
A one-step soft templating strategy for synthesizing uniform and monodisperse mesoporous carbon nanospheres (UM-MCNs) with sub-100 nm size and large mesopores without using any co-solvent additives has not yet been reported. Herein, an extremely simple,effective and environment friendly strategy was first developed to prepare uniform, monodisperse polymer nanospheres (PNs) and UM-MCNs with small particle size (80–90 nm) and large mesopores (~ 6.8 nm), where F108 with long hydrophilic chains not only served as mesopore-forming reagent, but also as a dispersant reagent that facilitated uniform growth of the nanospheres, resulting in a narrow particle size distribution. Moreover, F108 could also act as a stability-driving agent, that is, the phloroglucinol/formaldehyde polymer was tightly “locked” by the long hydrophilic segments of F108 via strong hydrogen bonding. Consequently, intact carbon nanospheres with large mesopores were obtained after carbonization, and finally a three-dimensional periodic arrangement of the UM-MCNs was formed. In addition, ethanol could be used as a co-surfactant or co-solvent during self-assembly. The present strategy may not only supply a novel avenue to synthesize UM-MCNs, but also shed light on insights into the profound impact of F108 with long hydrophilic chains and ethanol on the morphology and pore size of carbon spheres.
研究领域:
材料科学
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纳米工程
✓ 已验证
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2021
·
IF 5.039
Yushuai Chen,Bo Yang,Wenyu Xie,Xueying Zhao,Zhuan Wang,Xintai Su,Chao Yang
Insufficient active sites and fast charge carrier recombination are detrimental to photocatalytic activity of graphitic carbon nitride (g-C 3 N 4 ). In this work, a combination of pore creating with thermal exfoliation was employed to prepare porous g-C 3 N 4 nanosheets for photocatalytic water splitting into hydrogen. Hexadecyl trimethyl ammonium chloride (CTAC) as the soft template promoted the formation of porous g-C 3 N 4 during the thermal condensation of melamine. On further post-synthesis calcination, the porous g-C 3 N 4 aggregates were exfoliated into discrete nanosheets, accompanied by an increase in specific surface area and defects. Optimal porous g-C 3 N 4 nanosheets achieved 3.6 times the photocatalytic hydrogen evolution rate for bulk counterpart. The enhanced photocatalytic activity may be ascribed to TCN-1%CTAC has larger specific surface area, stronger optical absorption intensity and higher photogenerated electron–hole separation efficiency. The external quantum efficiency of TCN-1%CTAC was measured to be 3.4% at 420 nm. This work provides a simple combinatorial strategy for the preparation of porous g-C 3 N 4 nanosheets with low cost, environmental friendliness and enhanced photocatalytic activity.
研究领域:
材料科学
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环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE AND INTERFACE ANALYSIS
·
2022
·Vol. 54
·期 8
·899-908
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IF 1.702
Lingzhen Gong,Yongping Hang,Jinhao Li,Gang Dai,Agula Bao
Hierarchical porous carbons are widely used as adsorbents, catalyst supports, electrode materials, and other applications because of their high specific surface area (SSA), varied pore structure, adjustable porosity, and excellent physicochemical stability. Introducing heteroatoms such as N, P, or S, with electronegativities different from that of carbon, into the carbon skeleton can change the chemical properties of the surface and the density of the electron cloud around the carbon matrix, thus altering interactions of CO 2 molecules with the surface and improving CO 2 adsorption capacity. Therefore, doping heteroatoms in carbon materials has attracted a great amount of attention. In this paper, the template method was used with F108 (polyethylene glycol–polypropylene glycolpolyethylene glycol) as the template, resorcinol and formaldehyde solutions as the carbon sources, phosphoric acid as the phosphorus source, and KOH as the activator to prepare phosphorus-doped hierarchical porous carbons. Through a series of characterization and CO 2 adsorption experiments, the influence of the amount of KOH and template agent on the pore structure of carbon materials was studied. We conclude that these phosphorus-doped hierarchical porous carbon materials are promising CO 2 adsorbents.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CARBON
·
2019
·
IF 7.466
Lei Xie,Zhe Wang,Jinrong Liu,Yutong Gong,Shanjun Mao,Guofeng Lü,Xiao Ma,Lili Yu,Yong Wang
The easy hydrothermal method is a potential candidate for the preparation of carbohydrate-derived hierarchically porous polymers (HPPs) and carbons (HPCs). However, owing to the uncontrolled reaction rate and the weak affinity between precursors and soft templates, the synthesis of HPPs and HPCs with tunable properties through this method remains a great challenge. Here we develop a kinetics-controlled soft-template strategy to enable the preparation of a series of HPPs and HPCs with variable porous and morphological structures from diverse building blocks. By simply controlling the reaction kinetics with the change of acid concentration, flower-like and layered materials assembled from ordered mesoporous plates, and materials with adjustable mesopores and macropores aggregated from nanoparticles with different sizes, could be generated. Moreover, Pt nanoparticles were in situ encapsulated inside HPPs. With the advantages of both Pt nanoparticles and HPCs, the as made Pt@HPCs catalyst realized the size-selective hydrogenation of various alkenes .
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 8
·6000-6007
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IF 2.22
Jia Chaowei,Zhang Yanlin,Kong Quan,Wang Qiuyue,Chen Gang,Guam HongTao,Dong Chengjun
The fabrication of mesoporous structures has emerged as an effective strategy to greatly improve the performance of gas sensor. In this study, mesoporous NiFe 2 O 4 was prepared by a facile ligand-assisted self-assembly approach using P123 as a soft template combined with carboxylic ligand. The gas sensor based on the as-fabricated NiFe 2 O 4 exhibits a higher response of 57 to 200 ppm acetone with fast response (44 s) and recovery (24 s) time at 210 °C. More importantly, the sensor also presents excellent selectivity and long-term stability. The enhanced gas sensing behavior could be attributed to the unique mesoporous NiFe 2 O 4 with high surface area (91.4 m 2 /g) to provide abundant reactive sites and mesopores to promote gas molecular diffusion.
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 24
·14283-14290
·
IF 3.119
Xin Zhang,Jie Su,Xueyuan Wang,Xiaolei Tong,Fanglian Yao,Caideng Yuan
Graphene aerogels (GAs) were synthesized via a one-step hydrothermal method. Generally, the pore shape and diameter of GAs are difficult to control or the preparation process is complicated, requiring a multi-step operation. Herein, a soft-template one-step hydrothermal synthesis process was proposed to produce GAs with controllable pore sizes. Cyclohexane and n-butanol were added to a graphene oxide suspension to form a uniform aqueous dispersion under emulsification by sodium lauryl sulfate. The reduction process may have occurred around the organic droplets during the hydrothermal reaction, and a large number of organic droplets became countless physical barriers inside the hydrogel. In the later freeze-drying and high-temperature calcination procedures, the droplets evaporated to form a rich pore structure. Compared to the conventional templating method, the organic template was volatilized during the drying process such that no additional process for removing the template was required. In addition, GAs prepared by the template method possessed lower density (2.66 mg cm−3) and better compression performance and, as an adsorbent material, absorbed organic matter and petroleum from wastewater more efficiently than GAs obtained by the traditional one-step hydrothermal method; Q for n-hexane reached 116, and Q for xylene reached 147; also, the GAs prepared by the soft template method can absorb all crude oil in water samples within 30 s.
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
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Cao Tu,Weihua Luo,Yuting Peng,Peng Yu,Chuangqi Shi,Zhiping Wu,Lishu Shao,Peng Zhan
As a natural renewable biomass resource with abundant reserves, lignin has broad prospects in the preparation of lignin-based carbon fibers and lignin-based carbon nanospheres . However, it remains a challenge to prepare carbon nanotubes using lignin as a carbon source. Herein, a feasible method for the preparation of lignin-based carbon nanotubes ( L -CNTs) using lignin as the carbon source based on mobile chemical vapor deposition is proposed. First, lignin-based micelles were used as a soft template to prepare a catalyst, and then L -CNTs were synthesized from gaseous products generated by lignin pyrolysis. The results reflected the important roles of the catalyst preparation process, the concentration of catalyst precursor, and the synthesis temperature on the morphologies and structures of the L -CNTs. By adjusting the reaction conditions, L -CNTs with diameters ranging from 10 to 110 nm and lengths ranging from 1 to 6 µm were obtained. The synthesized L -CNTs were mainly multi-walled carbon nanotubes, of which the crystal layer spacing was 0.35 nm, with a good graphitization degree and thermal stability. This synthesis strategy will provide a new method for the high-value utilization of lignin.
研究领域:
材料科学
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生物质能
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2013
·Vol. 48
·期 17
·5718-5726
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IF 2.163
Han Linbo,Zhou Ying,He Ting,Song Guosheng,Wu Fan,Jiang Feiran,Hu Junqing
A simple synthetic method has been developed for synthesis of mesoporous silica nanoparticles with versatile morphologies by adopting CTAB and C 12 –OH as dual soft templates. In such a simple method, only by regulating the dose of C 12 –OH and temperature, we can well-realize the silica nanoparticle morphological transformation from sphere to shell-like, rugby-like, peanut-like, hollow, and complex yolk–shell structures. These as-fabricated silica nanoparticles were characterized by scanning electron microscopy, transmission electron microscopy, Brunauer–Emmett–Teller (BET), and small-angle powder X-ray diffraction. The as-prepared mesoporous silica nanoparticles with versatile morphologies possessing varying BET surface areas, pore diameter, and pore distributions have some potential applications in separation, sensing, and heterogeneous catalysis.
研究领域:
材料科学
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纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2022
·Vol. 24
·期 5
·1-10
·
IF 2.533
Wang Wei,Zhi Guowei,Liu Liu,Cao Lihui,Xie Jing,Sun Luanhong,Hao Lingyun,Yao Hanyu
CuSbS 2 particles could be rapidly prepared by the microwave-assisted liquid phase method. Polyethylene glycol (PEG) was used as the directing agent for morphology and structure of CuSbS 2 particles. Microwave irradiation could induce Cu 2+ , adsorbed on PEG chain structure, to reduce as Cu + . In the further reaction, the rod-like structure of CuSbS 2 was formed. The results showed that the CuSbS 2 particles prepared by the PEG400 structure directing agent had a higher first discharge specific capacity (~1499.6 mAh g −1 ) and excellent electronic and ionic conductivity. This method provides a new idea for the morphology control of anode materials for high energy density lithium batteries.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Can Chen,Tengxiao Ren,Shuang Wu,Xixi Xin,Ben Ge,Shangli Hao,Mingyue Ma,Jie Pang,Jingwei Zhang
Rational design of the pore structure for carbon materials is of great significance for solving the low specific capacitance and poor rate capability of supercapacitors. A novel soft-templating strategy is proposed by using biomass-derived sodium lignosulphonate as a carbon precursor and sublimable hexamethylenetetramine as a soft template. The hexamethylenetetramine nanoparticles are formed in the confined spaces of the precursor, and then these templates sublime to leave mesopores after the lignosulfonate transformed from linear structure to bulk structure by thermostabilization treatment. A high nitrogen content of 40 wt% in hexamethylenetetramine is also beneficial for the subsequent in-situ N-doping. The as-obtained nitrogen-doped hierarchical porous carbon microspheres possess a high specific surface area of 1416 m 2 g −1 with an N-doping content of 4.32 % (86.26 % edge-N). In a two-electrode system, the soft-templating carbon exhibits a decent specific capacitance of 234 F g −1 at 0.1 A g −1 , an excellent rate capability of 62.4 % at 50 A g −1 , and a high energy density of 8.1 Wh kg −1 at 15.0 kW kg −1 in 6 M KOH aqueous electrolyte. Moreover, advanced additive manufacturing technology of direct ink writing was applied to construct a quasi-solid-state in-plane interdigital microsupercapacitor by using the soft-templating carbon, and it presents a superior areal/volumetric capacitance, rate performance, mechanical stability, and flexibility with PVA/H 2 SO 4 gel electrolyte. This work broadens the pore structure engineering methodology by novel soft-templating biocarbon for multi-functional and multi-scenario energy storage systems.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Yufu Yi,Shiyu Wu,Hai Luo,Lu He,Yuling Yang,Ting Xue,Junming Xu,Yangping Wen,Peng Wang
A variety of phosphorus doped porous carbon spheres (P-PCSs) with tunable microstructure are facilely prepared by hydrothermal method using xylan as a carbon source, phosphoric acid as an activator and dopant, surfactants as soft templates. Surfactants are beneficial to the development of pore structure and the decrease of particle size. In particular, the introduction of polyvinylpyrrolidone (PVP) facilitates the formation of hierarchically porous structure and nanoscale dimension. The activation of phosphoric acid can improve the graphitization degree, enrich the surface oxygen-containing groups, realize phosphorus doping, and increase the specific surface area. The prepared PVP-P-PCS as a highly conducting electrocatalyst with well dispersed nano-sized spherical morphology of 50–150 nm, large specific surface area of 1558.14 m 2 /g and hierarchical porosity with coexisted micropores, mesopores and macropores, displays enhanced current responses of about 55-fold enhancement for luteolin and 52-fold enhancement for baicalin compared with bare GCE, intrinsic oxidase-like (nanozyme) characteristics, excellent electrocatalytic ability for luteolin with a low limit of detection (LOD) of 0.77 nM in linear ranges of 0.05–1 μΜ, and baicalin with a LOD of 3.3 nM in linear range of 0.05–1 μM. First-order derivative voltammetry is selected for realizing distinguishable determination of two flavonoids, which demonstrates satisfactory results in the practical application.
研究领域:
材料科学
·
分析化学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Anran Zhang,Lv Li,Lingling Ma,Yanzhen Ren,Lei Bai,Gaohong He,Fengxiang Zhang
This work reports a novel, effective, soft template strategy that can fabricate good-performance anion exchange membranes (AEMs) for electrodialysis application. Specifically, 1,2-ethanedisulfonic acid (EDA) is used as a small-molecule, soft template to promote microphase separation in multi-cation functionalized poly (2,6-dimethyl-1,4-phenylene oxide) membranes through electrostatic interaction between quaternary ammonium groups and sulfonic acid groups. The enhanced microphase separation has been confirmed by transmission electron microscopy (TEM) and small angle X-ray scattering studies. The prepared TPPO-2S-x membranes (where x represents the mass percent of EDA) were tested in the electrodialysis device for desalinating 0.1 M NaCl solution. Among them, the TPPO-2S-1 membrane gave the highest ED current efficiency (92.90 %), the lowest energy consumption (4.08 kWh kg −1 ), and the largest Cl − transport number (0.98); these performance results are better compared with those of the TPPO-2S-0 membrane (89.29 %, 4.39 kWh kg −1 , and 0.98), which is not processed by soft template strategy. Although the TPPO-2S-4 and TPPO-2S-7 membrane show more obvious microphase separation than TPPO-2S-1, the current efficiencies of their ED devices are lower and the energy consumptions are higher due to their undesirable surface area resistance and chloride ion transport number. The investigation demonstrates that the soft template strategy is effective to improve membrane performance in ED devices.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）