COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Xueying Zhao,Wenyu Xie,Zhibo Deng,Gan Wang,Aihui Cao,Huamei Chen,Bo Yang,Zhuan Wang,Xintai Su,Chao Yang
NiO-TiO 2-x /C composites for photo-catalytic hydrogen production have been prepared by a molten salt template-assisted pyrolysis of Ni/Ti-oleylamine precursors at different temperatures. X-ray diffraction (XRD) analysis shows that it is brookite structure, and X-ray photoelectron spectrum (XPS) determines the chemical state of the elements. Carbon nanosheets improve the dispersion and stability of TiO 2 , making the later fully close to each other. NiO facilitates the separation of photo-generated carriers and enhances the photocatalytic hydrogen production activity of TiO 2 . Due to the efficient synergy of carbon nanosheets, NiO, and TiO 2 , the optimized (1 wt%)NiO-TiO 2-x /C-T650 nanocomposites show enhanced activity toward photocatalytic hydrogen production from water, outperforming 18-fold in activity higher than pristine TiO 2 /C. Moreover, the (1 wt%)NiO-TiO 2-x /C-T650 catalyst exhibits good stability without obvious decrease in activity under continuous cycling. This work will lead to the optimization of carbon-supported multi-component catalysts for photocatalytic hydrogen production.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Liang Chen,Xin Li,Chenxi Xu,Fujia Wang,Wei Wang,Gangyong Li,Minjie Zhou,Binhong He,Wenyuan Xu,Zhaohui Hou
The design and exploitation of advanced transition metal oxides (TMO)/carbon hybrid anodes remain significant but challenging for the evolution of lithium–ion batteries (LIBs). In this work, Co 3 O 4 nanodots anchored into 2D N-doped carbon nanosheets (Co 3 O 4 NDs/NCN) hybrid is successfully fabricated by a facile salt-template assisted pyrolysis strategy using glucose, Co(NO 3 ) 2 ·6H 2 O and NaCl salt template as reaction precursors. The morphology, structure and composition of the resultant Co 3 O 4 NDs/NCN hybrid are systematically investigated, and the effect of salt template on the preparation of products is also deeply explored. It is surprisingly found that the introduction of NaCl template promotes the formation of Co 3 O 4 , which is different from what has been reported previously. In addition, the added NaCl template can be used to regulate the microstructure of Co 3 O 4 NDs/NCN hybrid, which displays unique micromorphology (Co 3 O 4 NDs anchored into 2D NCN), successful N doping in carbon matrix, Co-N-C bond between two components and much increased specific surface area. As a result, this hybrid shows excellent lithium storage performance when used as the anode for LIBs, which can be comparable to those previously reported Co 3 O 4 /C hybrid anodes. Clearly, this work offers a good reference for the construction of low-cost and high-performance TMO/carbon LIBs anodes.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
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 ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Li Lv,Yinglin Wang,Pengfei Cheng,Yue Zhang,Yaoqiong Zhang,Zhaohui Lei,Luping Xu,Zhi Weng
In this study, a one-step chemical vapor deposition (CVD) method was used, utilizing template NaCl and dextrin as the porogen and structural support. The synthesized spinel MFe 2 O 4 (M = Zn, Ni, Cu, Co and Mn) microspheres with multiple cavities structure were applied to the acetone gas sensor detection. Through the characterization of the sensitive materials, the average pore diameter of the microspheres was about 60 nm. Compare with other metal cations , when M = Zn or Ni, the MFe 2 O 4 samples revealed the super gas sensitivity at working temperatures of 250 °C and 175 °C, and the response values to 100 ppm acetone were 25 and 24.3, respectively. In addition, they also exhibited excellent selectivity and long-term stability to acetone. The excellent gas sensitivity of ZnFe 2 O 4 and NiFe 2 O 4 could be attributed to the replacement of Fe with Zn and Ni ions to obtain a higher Fe 3+ /Fe 2+ atomic ratio, thereby increasing the content of adsorbed oxygen. In summary, the gas sensing performance of spinel MFe 2 O 4 oxide had been systematically studied by replacing Fe with other transition metals. The iron-containing spinel oxides are expected to be promising sensing material for gas sensors due to their rich elements and excellent activity.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
NEW CARBON MATERIALS
·
2017
·
IF 1.02
Shu-zhang Niu,Si-da Wu,Wei Lu,Quan-hong Yang,Fei-yu Kang
Porous carbon materials can increase the conductivity of sulfur and restrain the shuttling of polysulfides in the electrolyte. A hierarchical microporous-mesoporous carbon (HMMC) with a large surface area and pore volume was prepared by the simple one-step carbonization of a mixture of magnesium gluconate (MG) and phenolic resin. The MG was transformed into nanosize magnesium oxide that acted as a hard template during carbonization to create mesopores. The HMMC has a high surface area (∼1 560 m 2 g −1 ) and large pore volume (∼2.6 cm 3 g −1 ), which provides abundant space for sulfur loading and accommodates volume changes during charge/discharge. The interconnected pore structure and carbon framework ensure fast electron and Li ion transfer. As the cathode of a Li-S battery the sulfur-loaded HMMC has a high discharge capacity of 939 mAh g −1 at 0.3 C and a reversible capacity of 731 mAh g −1 after 150 cycles with only a 0.15% capacity fade per cycle. Even at a high rate of 2 C, it still delivers a high discharge capacity of 626 mAh g −1 , showing an excellent rate performance.
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
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Kejing Wu,Yi Liu,Chunyan Yang,Siyang Tang,Changjun Liu,Yingying Liu,Houfang Lu,Bin Liang
A novel and practical CaCl 2 salt templating method is used to tune the pore size of carbon materials from calcium lignosulfonate. In-situ crystalized CaCl 2 particles serve as templates for mesopores and as carbonization substrates. Hierarchical carbons are constructed using coupled SiO 2 spheres and CaCl 2 templates. The SiO 2 spheres improve the pore size assigned to CaCl 2 particles and high CaCl 2 :lignin mass ratios benefit large CaCl 2 crystals to improve the size of mesopores. The porous carbons are used as supports of molybdenum carbide (MoC) with C-C and C-O cleavage activity for Kraft lignin decomposition into aromatic monomers. The results show that MoC over porous carbon supports achieves the highest aromatic yield of 0.716 g/g Kraft lignin and exhibits high stability of aromatic yields. Suitable pore size for lignin macromolecule diffusion significantly enhances the catalytic performance of molybdenum carbide.
研究领域:
材料科学
·
催化化学
·
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
Junfeng Zhao,XueDong Xie,Meiqi Xi,Zichen Wang,Shilong Yin,Zhefei Wang,Gang Yang
Herein, we reported a salt-template approach for the construction of hybrid materials composed of Fe 3 O 4 nanoparticles embedded in hierarchical porous carbon . Benefiting from the combined effect of sufficient space to alleviate the volume expansion of Fe 3 O 4 and the good electronic conductivity of three dimensional interconnected framework, the hybrid materials deliver excellent performance. HPCs/Fe 3 O 4 -2 anode displays a high reversible capacity of 1018.4 mAh g −1 after 250 cycles at 0.2 A g −1 , and an excellent cycling-life stability of 415.4 mAh g −1 after 1000 cycles at a high current density of 5 A g −1 , suggesting the potential application in LIBs anode. Such an effective and simple approach to construct carbon-based hybrid materials can be further extended to fabricate other anode and cathode materials with excellent performance.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Dongwei Xu,Mingju Zhang,Zhihao Shen,Chao Wang,Duo Chen,Yuxuan Wei,You Zeng,Biao Zhao,Xuhai Xiong,Ping Chen
The rational structural design and precise compositional regulation of lightweight and broadband carbon-based absorbing materials is an urgent task at present to deal with the complex electromagnetic environment. The soluble salt template assisted preparation technology holds good feasibility for constructing unique hollow carbon-based microwave absorbents due to their reusability and economy of salt templates. Nevertheless, magnetic modified nitrogen doping hollow carbon microcapsules fabricated by employing salt-template technique have not been explored. Herein, we adopt a green and low cost NaCl soluble salt template assisted synthesis strategy to universally fabricate 3D unique hollow carbon-based microwave materials loaded with precursors of magnetic particles. Following the high-temperature pyrolysis and wash desalting template, we have successfully achieved mass preparation of magnetic modified nitrogen doping hollow carbon microcapsules. Benefiting from the unique chemical component dominance and distinctive structural merits, the optimized Ni magnetic modified nitrogen doping hollow carbon microcapsules (Ni@N-HCNs) delivered extremely outstanding microwave absorption performance (MAP), including an optimal minimum reflection loss value (RLmin) of −37.7 dB and an effective absorption bandwidth of 5.5 GHz under a filling level of only 5 wt%. More excitingly, the widest effective absorption bandwidth could cover up to 7.87 GHz (10.03–18.0 GHz) at a thin matching thickness of 2.6 mm. Due to the large-scale production and simple preparation process, Ni@N-HCNs composites might be considered as one of the most competitive candidates for the design of lightweight and high performance microwave absorbents.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2022
·Vol. 55
·期 43
·434002
·
IF 3.409
Yao Xiao,Aixia Geng,Junjiang Zhu,Xiao Xu,Xuelian Xu
A bubbling template method was used to prepare metal-doped graphitic carbon nitride (g-CN), with ammonium salts as the bubbling templates. Effects of metal types, metal loading, as well as the species and dosage of ammonium salts, on the structure, physicochemical properties and catalytic performances of g-CN were systematically investigated. Photocatalytic degradation of rhodamine B (RhB) was used as a model reaction to evaluate the catalytic performances of the materials. The results indicated that K0.02-CN(CA-3), which was prepared with K doping and with ammonium carbonate as the bubbling template, exhibited the best activity, with 99.7% RhB conversion obtained at 17.5 min, which is 3.2 times higher than that of g-CN. This can be attributed to the improved surface area, widened light absorption range and enhanced electron–hole separation efficiency of K0.02-CN(CA-3), as compared to these of g-CN. This material was also active for photo-degradation of other pollutants and has good reusability. A sketchy mechanism indicating the reactive intermediates of reaction was proposed.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yangsen Zeng,Feng Wei,Qingyun Liu,Yaojie Gao,Shengtao Gao,Yaohui Lv
As one of the energy storage devices, aqueous zinc ion hybrid capacitors (AZHCs) have been intensively investigated because of their characteristics of high gravimetric capacity, excellent safety and environmental compatibility. Yet, the preparation of highly active electrode materials for AZHCs is still a huge defiance. Herein, the superior energy density and anti-self-discharge AZHCs are achieved based on the P doped honeycomb-like carbons (PHCs) with high surface area, total pore volume and O/P functionalities, which prepared from the triphenyl phosphate by the salt template strategy. The unique structural characteristics of the PHC cathodes not only offer abundant active sites for Zn 2+ ion storage, but also supply lots of channels for ion transfer, resulting in rapid ion transport kinetics. Interestingly, the PHC 3 cathode presents high capacity of 150.1 mAh g −1 at 0.1 A g −1 , big energy and power output of 126.8 Wh kg −1 and 12.19 kW kg −1 and excellent cycle stability with capacity retention of 98.56% after 30,000 cycles. Moreover, the capacity keeps 87.77% of the initial capacity after rested for 250 h. This study offers a facile strategy to prepared carbon cathodes with the heteroatoms for high performance AZHCs.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Chunliu Zhu,Rui Long,Liyang Zhu,Wenyu Zou,Yafei Zhang,Zongying Gao,Jing Shi,Weiqian Tian,Jingyi Wu,Huanlei Wang
Zinc ion hybrid capacitors (ZIHCs) are encouraging energy storage devices for large-scale applications. Nevertheless, the electrochemical performance of ZIHCs is often limited by the cathode materials which show low energy density and rate capability practically. One of the efficient strategies to overcome these challenges is the development of advanced carbon cathode materials with abundant physi/chemisorption sites. Herein, we develop a sulfate template strategy to prepare sulfur and oxygen doped carbon nanosheets (SOCNs) as a potential cathode active material for ZIHCs. The as-prepared SOCNs exhibit porous architectures with a large surface area of 1877 m 2 g −1 , substantial structural defects, and high heteroatom-doped contents (O: 7.9 at%, S: 0.7 at%). These exceptional features are vital to enhancing Zn ion storage. Consequently, the SOCN cathode shows a high capacity of 151 mAh g −1 at 0.1 A g −1 , high cycle stability with 83% capacity retention at 5 A g −1 after 4000 cycles, and a superior energy density of 103.1 Wh kg −1 . We also investigate the dynamic adsorption/desorption behaviors of Zn ions and anions of the ZIHCs carbon electrodes during the process of charge and discharge by ex-situ experiments. This work highlights the significance of the integration with a large specific surface area and bountiful heteroatoms in carbon electrodes for achieving high-performance ZIHCs.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2021
·
IF 3.882
Shiyu Wu,Yufu Yi,Shengliang Liao,Hongyan Si,Yuling Yang,Guorong Fan,Peng Wang
We described the comprehensive synthesis, characterization, and catalytic performance of a novel type of the ordered cubic Ia3̅d supermicroporous silicas by using tetraethyl orthosilicate as a silicon source and a hydroxyl-functionalized quaternary ammonium salt as a template under alkali conditions. The effects of various reaction conditions on the pore structure and morphology of the silica materials were thoroughly investigated. Our results showed that under a wide range of reaction conditions, supermicroporous silicas with a highly ordered cubic Ia3̅d structure can be produced with a large BET specific surface area of 1741 m2/g, high pore volume of 0.91 cm3/g, concentrated pore size at 19.1 Å, and crystalline morphology. After Al doping, the obtained aluminosilicates preserved a highly ordered cubic supermicroporous structure. By using the H-form aluminosilicates as catalysts, we selectively dimerized β-pinene. The catalysts exhibited an excellent catalytic activity for β-pinene dimerization with a conversion yield up to 100%. Compared with conventional mesoporous H-form Al-MCM-48 catalysts, the prepared supermicroporous catalysts exhibited superior catalytic performance due to their excellent shape-selective properties, producing the β-pinene dimer in a yield up to 72.4% with dimer/oligomer ratios in the range of 7.5–10.1. This study featured a detailed preparation and characterization of supermicroporous silica with novel microstructures and showed its utility in catalytic dimerization.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）