U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PubAg

Main content area

You searched for: Journal name Journal of materials chemistry A Remove constraint Journal name: Journal of materials chemistry A Publication year rev 7986-2014 Remove constraint Publication year rev: 7986-2014 Source 2014 v.2 no.21 Remove constraint Source: 2014 v.2 no.21
Start Over

Search

66  Search Results

« Previous | 1 - 20 of 66 |
Number of results to display per page

Search Results

1. 3D mesoporous hybrid NiCo₂O₄@graphene nanoarchitectures as electrode materials for supercapacitors with enhanced performances

Author:
Yiying Wei; Shuangqiang Chen; Dawei Su; Bing Sun; Jianguo Zhu; Guoxiu Wang
Source:
Journal of materials chemistry A 2014 v.2 no.21 pp. 8103-8109
ISSN:
2050-7496
Subject:
capacitance; electrodes; freeze drying; graphene; nanosheets; porous media; scanning electron microscopy; surface area; transmission electron microscopy
Abstract:
... 3D mesoporous hybrid NiCo₂O₄@graphene nanoarchitectures were successfully synthesized by a combination of freeze drying and hydrothermal reaction. Field-emission scanning electron microscopy (FESEM) and TEM analyses revealed that the NiCo₂O₄@graphene nanostructures consist of a hierarchical mesoporous sheet-on-sheet nanoarchitecture with a high specific surface area of 194 m² g⁻¹. Ultrathin NiCo₂O ...
DOI:
10.1039/c3ta15423h

2. Bio-inspired carbon nitride mesoporous spheres for artificial photosynthesis: photocatalytic cofactor regeneration for sustainable enzymatic synthesis

Author:
Jianhui Huang; Markus Antonietti; Jian Liu
Source:
Journal of materials chemistry A 2014 v.2 no.21 pp. 7686-7693
ISSN:
2050-7496
Subject:
NAD (coenzyme); carbon nitride; colloids; graphene; nanosheets; photocatalysis; photosynthesis; porous media; thylakoids
Abstract:
... Inspired by the photosynthetic thylakoid membrane of chloroplasts, we present here the rational design of mesoporous structured colloids made up of graphitic carbon nitride nanosheets and demonstrate their application in photocatalytic NADH regeneration for sustainable enzymatic synthesis. ...
DOI:
10.1039/c4ta00793j

3. Biotemplated synthesis of bark-structured TiC nanowires as Pt catalyst supports with enhanced electrocatalytic activity and durability for methanol oxidation

Author:
Zhen Qiu; Hui Huang; Jun Du; Xinyong Tao; Yang Xia; Tong Feng; Yongping Gan; Wenkui Zhang
Source:
Journal of materials chemistry A 2014 v.2 no.21 pp. 8003-8008
ISSN:
2050-7496
Subject:
carbon; catalysts; catalytic activity; crystallization; durability; electrical conductivity; electrochemistry; ethylene glycol; fuel cells; lint cotton; methanol; nanoparticles; nanopores; nanowires; oxidation; platinum; surface area
Abstract:
... Developing Pt eletrocatalysts with high activity and long-term durability remains a great challenge in commercializing fuel cells. Herein, we report a new kind of bark-structured TiC nanowire (NW) as an efficient support for Pt electrocatalysts, which exhibits a higher electrochemically active surface area (ECSA), much improved electrocatalytic activity and long-term durability toward a methanol o ...
DOI:
10.1039/c4ta00277f

4. Brookite TiO₂ decorated α-Fe₂O₃ nanoheterostructures with rod morphologies for gas sensor application

Author:
Yanshuang Wang; Shurong Wang; Hongxin Zhang; Xueling Gao; Jiedi Yang; Liwei Wang
Source:
Journal of materials chemistry A 2014 v.2 no.21 pp. 7935-7943
ISSN:
2050-7496
Subject:
acetone; ambient temperature; benzene; butanol; catalytic activity; ethanol; ferric oxide; lithium batteries; methanol; nanoparticles; nanorods; pollutants; surfactants; titanium dioxide; toluene; volatile organic compounds; wastewater treatment; xylene
Abstract:
... In this paper, brookite-TiO₂/α-Fe₂O₃ heterostructured nanorods were synthesized by a facile two-step solution approach without using any templates or surfactants. α-Fe₂O₃ nanorods were first successfully obtained via a simple solution method at room temperature. The α-Fe₂O₃ nanorods were further employed as supports to construct nanoheterostructures for gas sensor application. The gas sensor based ...
DOI:
10.1039/c4ta00163j

5. A CO₂-stable reduction-tolerant Nd-containing dual phase membrane for oxyfuel CO₂ capture

Author:
Huixia Luo; Tobias Klande; Zhengwen Cao; Fangyi Liang; Haihui Wang; Jürgen Caro
Source:
Journal of materials chemistry A 2014 v.2 no.21 pp. 7780-7787
ISSN:
2050-7496
Subject:
X-ray diffraction; air; carbon dioxide; energy-dispersive X-ray analysis; methane; microstructure; oxidation; oxygen; permeability; scanning electron microscopy; sol-gel processing; synthesis gas; temperature
Abstract:
... We report a novel CO₂-stable reduction-tolerant dual-phase oxygen transport membrane 40 wt% Nd₀.₆Sr₀.₄FeO₃₋δ–60 wt% Ce₀.₉Nd₀.₁O₂₋δ (40NSFO–60CNO), which was successfully developed by a facile one-pot EDTA–citric sol–gel method. The microstructure of the crystalline 40NSFO–60CNO phase was investigated by combined in situ X-ray diffraction (XRD), scanning electron microscopy (SEM), back scattered SE ...
DOI:
10.1039/c3ta14870j

6. Construction of PANI–cellulose composite fibers with good antistatic properties

Author:
Xingwei Shi; Yanli Hu; Feiya Fu; Jinping Zhou; Yixiang Wang; Lingyun Chen; Hongming Zhang; Ji Li; Xianhong Wang; Lina Zhang
Source:
Journal of materials chemistry A 2014 v.2 no.21 pp. 7669-7673
ISSN:
2050-7496
Subject:
cellulose; hydrogen bonding; hydrophilicity; hydrophobicity; polyaniline; semiconductors; sodium hydroxide; solvents; urea
Abstract:
... For the first time, novel polyaniline (PANI)–cellulose filament fibers have been successfully spun from hydrophobic PANI and hydrophilic cellulose complex solution dissolved in aqueous containing 7 wt% NaOH/12 wt% urea as the solvent by wet-spinning. The composite fibers had a circular cross-section and homogenous surface structure, as a result of good miscibility between PANI and cellulose associ ...
DOI:
10.1039/c4ta01149j

7. Effective recovery of acids from iron-based electrolytes using graphene oxide membrane filters

Author:
Pengzhan Sun; Kunlin Wang; Jinquan Wei; Minlin Zhong; Dehai Wu; Hongwei Zhu
Source:
Journal of materials chemistry A 2014 v.2 no.21 pp. 7734-7737
ISSN:
2050-7496
Subject:
acids; cation-exchange membranes; electrolytes; ferric chloride; filters; graphene oxide; hydrogen bonding; iron; protons; sieving; water reuse
Abstract:
... The efficient recovery of acids from iron-based electrolytes using graphene oxide (GO) membranes was demonstrated for the first time. The results revealed that the amount of H⁺ permeating the GO membranes and reaching drains was two orders of magnitude larger than that of Fe³⁺. Notably, when the FeCl₃ source concentration was reduced to certain extent, Fe³⁺ could be completely blocked by GO membra ...
DOI:
10.1039/c4ta00668b

8. Effective synergistic effect of Al₂O₃ and SiC microparticles on the growth of carbon nanotubes and their application in high dielectric permittivity polymer composites

Author:
Anthony B. Dichiara; Jinkai Yuan; Shenghong Yao; Alain Sylvestre; Laurent Zimmer; Jinbo Bai
Source:
Journal of materials chemistry A 2014 v.2 no.21 pp. 7980-7987
ISSN:
2050-7496
Subject:
aluminum oxide; carbon nanotubes; catalysts; ceramics; dielectric permittivity; dielectric properties; microparticles; mixing; silicon carbide; synergism; thermoplastics; vapors; viscosity
Abstract:
... Owing to their excellent intrinsic properties, carbon nanotubes (CNTs) have been widely used to reinforce polymer composites. However, CNT aggregation, the poor CNT/matrix nanoscale interface and increased viscosity are perplexing issues limiting the applications of CNTs in polymer composites. A potential solution to achieve high dispersion states relies upon the concept of micro/nanoscale structu ...
DOI:
10.1039/c4ta00369a

9. Effects of cationic substitution on structural defects in layered cathode materials LiNiO₂

Author:
Hungru Chen; James A. Dawson; John H. Harding
Source:
Journal of materials chemistry A 2014 v.2 no.21 pp. 7988-7996
ISSN:
2050-7496
Subject:
aluminum; cathodes; cobalt; electrochemistry; energy; manganese; nickel; oxygen; stoichiometry; thermal stability
Abstract:
... The electrochemical properties of layered rock salt cathode materials are strongly influenced by defects. The three most common defects in LiNiO₂-based compounds, namely extra Ni, Li–Ni anti-site and oxygen vacancy defects have been investigated. The calculated defect formation energies are very low in LiNiO₂, consistent with the difficulty in synthesizing stoichiometric defect-free LiNiO₂. A syst ...
DOI:
10.1039/c4ta00637b

10. Engineering crystalline structures of two-dimensional MoS₂ sheets for high-performance organic solar cells

Author:
Xi Yang; Weifei Fu; Wenqing Liu; Jinghua Hong; Yu Cai; Chuanhong Jin; Mingsheng Xu; Haibo Wang; Deren Yang; Hongzheng Chen
Source:
Journal of materials chemistry A 2014 v.2 no.21 pp. 7727-7733
ISSN:
2050-7496
Subject:
crystal structure; engineering; molybdenum disulfide; oxygen; solar cells
Abstract:
... The effects of different local crystalline structures on two-dimensional (2D) MoS₂ sheets are studied to provide new insights into how the local characteristics affect the performance of organic solar cells (OSCs) and how to tailor the local characteristics towards high-performance devices. UV–ozone post-treatment of 2D MoS₂ sheets led to incorporation of oxygen atoms into the lattice of the sheet ...
DOI:
10.1039/c4ta01336k

11. Enhanced electrochemical performance of Li₃V₂(PO₄)₃/Ag–graphene composites as cathode materials for Li-ion batteries

Author:
Man-Soo Choi; Hyun-Soo Kim; Young-Moo Lee; Bong-Soo Jin
Source:
Journal of materials chemistry A 2014 v.2 no.21 pp. 7873-7879
ISSN:
2050-7496
Subject:
Raman spectroscopy; X-ray diffraction; cathodes; electrochemistry; graphene; lithium batteries; scanning electron microscopy; silver; synergism
Abstract:
... In this study, we have synthesized a Li₃V₂(PO₄)₃/Ag–graphene (LVP/Ag–G) composite using a facile sol–gel route. The physical and electrochemical properties of the LVP/Ag–G composite have been evaluated by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy and electrochemical measurements. In the potential range 3.0–4.3 V, the LVP/Ag–G electrode delivered a capacity of ...
DOI:
10.1039/c4ta00031e

12. Enhanced photocatalytic mechanism for the hybrid g-C₃N₄/MoS₂ nanocomposite

Author:
Jiajun Wang; Zhaoyong Guan; Jing Huang; Qunxiang Li; Jinlong Yang
Source:
Journal of materials chemistry A 2014 v.2 no.21 pp. 7960-7966
ISSN:
2050-7496
Subject:
absorption; carbon nitride; density functional theory; electrons; hydrogen production; molybdenum disulfide; nanocomposites; photocatalysis; photocatalysts; semiconductors
Abstract:
... Here, we explore the enhanced photocatalytic mechanism for the hybrid g-C₃N₄/MoS₂ nanocomposites for the first time by performing extensive density functional theory calculations. The calculated band alignment between the g-C₃N₄ monolayer and MoS₂ sheets clearly reveals that the conduction band minimum and valence band maximum of the g-C₃N₄ monolayer are higher by about 0.83 eV and 0.15 eV respect ...
DOI:
10.1039/c4ta00275j

13. Fabrication and characterization of silica nanotubes with controlled dimensions

Author:
Wen-Jian Zhang; Chun-Yan Hong; Cai-Yuan Pan
Source:
Journal of materials chemistry A 2014 v.2 no.21 pp. 7819-7828
ISSN:
2050-7496
Subject:
electrolytes; hydrophilicity; methanol; nanotubes; nanowires; polymerization; polymers; silica; styrene
Abstract:
... Silica nanotubes with controlled diameters and lengths were fabricated by a template-directed method. Nanowires composed of poly(2-dimethylaminoethyl methacrylate)-block-polystyrene (PDMAEMA–PS), which were fabricated by RAFT dispersion polymerization of styrene in methanol using PDMAEMA as a macro-RAFT agent, were used as sacrificial templates. The diameter of the polymeric nanowires can be adjus ...
DOI:
10.1039/c4ta00465e

14. Fabrication and performance of a Mn–La metal composite for remarkable decontamination of fluoride

Author:
Yang Yu; J. Paul Chen
Source:
Journal of materials chemistry A 2014 v.2 no.21 pp. 8086-8093
ISSN:
2050-7496
Subject:
adsorption; carbonates; chlorides; coprecipitation; decontamination; fluorides; human health; humic acids; ion exchange; manganese; models; moieties; pH; phosphates; risk; sorbents; sorption isotherms; sulfates
Abstract:
... Fluoride contamination has become a great issue of concern in recent years as it could cause a high risk to human health through water consumption. In this study, a new manganese–lanthanum bimetal composite was developed by a co-precipitation method. The adsorption was highly pH dependent, and the optimal adsorption was obtained at pH 5.0. The Langmuir equation better fitted the experimental data ...
DOI:
10.1039/c3ta15251k

15. From biomass to high performance solar–thermal and electric–thermal energy conversion and storage materials

Author:
Yuanqing Li; Yarjan Abdul Samad; Kyriaki Polychronopoulou; Saeed M. Alhassan; Kin Liao
Source:
Journal of materials chemistry A 2014 v.2 no.21 pp. 7759-7765
ISSN:
2050-7496
Subject:
absorption; aerogels; biomass; carbon; electrical conductivity; energy conversion; enthalpy; hydrothermal carbonization; melons; melting; paraffin wax; pyrolysis; raw materials; solar radiation; thermal energy; thermal stability
Abstract:
... We demonstrate that lightweight, highly electrically conductive, and three-dimensional (3D) carbon aerogels (CAs) can be produced via a hydrothermal carbonization and post pyrolysis process using various melons as raw materials. This two-step process is a totally green synthetic method with cheap and ubiquitous biomass as the only raw material. These black-colored, highly electrically conductive a ...
DOI:
10.1039/c4ta00839a

16. Functionalized mesoporous structured inorganic materials as high temperature proton exchange membranes for fuel cells

Author:
San Ping Jiang
Source:
Journal of materials chemistry A 2014 v.2 no.21 pp. 7637-7655
ISSN:
2050-7496
Subject:
aluminum oxide; chemistry; ferric oxide; fuel cells; humidity; porous media; silica; temperature; titanium dioxide
Abstract:
... There are significant technological and economical advantages for operating a proton exchange membrane fuel cell (PEMFC) at temperatures above 100–150 °C. One of the key components in the development of high temperature PEMFCs is the proton exchange membrane (PEM). The PEM not only needs to be highly stable in the harsh chemical and physical environment in fuel cells, but also needs to possess hig ...
DOI:
10.1039/c4ta00121d

17. Graphene-based composite supercapacitor electrodes with diethylene glycol as inter-layer spacer

Author:
Yu Yu; Yongbin Sun; Changyan Cao; Shuliang Yang; Hua Liu; Ping Li; Peipei Huang; Weiguo Song
Source:
Journal of materials chemistry A 2014 v.2 no.21 pp. 7706-7710
ISSN:
2050-7496
Subject:
X-ray photoelectron spectroscopy; atomic force microscopy; capacitance; diethylene glycol; electrochemistry; electrodes; electrolytes; graphene; graphene oxide; nanocomposites; surface area
Abstract:
... Diethylene-glycol/graphene nano-composites were produced by a simple mild solvothermal method, in which diethylene glycol was grafted onto the surfaces of reduced graphene oxides (RGO) as an inter-layer spacer to spatially separate graphene sheets, i.e. to prevent the aggregation of graphene single sheets. The presence of diethylene glycol was confirmed by several characterizations, including IR, ...
DOI:
10.1039/c4ta00905c

18. Hierarchical NiFe₂O₄/Fe₂O₃ nanotubes derived from metal organic frameworks for superior lithium ion battery anodes

Author:
Gang Huang; Feifei Zhang; Leilei Zhang; Xinchuan Du; Jianwei Wang; Limin Wang
Source:
Journal of materials chemistry A 2014 v.2 no.21 pp. 8048-8053
ISSN:
2050-7496
Subject:
annealing; anodes; coordination polymers; electrochemistry; ferric oxide; iron; lithium batteries; nanotubes; surface area; synergism
Abstract:
... A simple method for the synthesis of NiFe₂O₄/Fe₂O₃ nanotubes by annealing core–shell Fe₂Ni MIL-88/Fe MIL-88 metal organic frameworks (MOFs) has been developed. The crystalline phase, morphology and specific surface area (BET) of the resulting sample have been systematically characterized. The results indicate that the NiFe₂O₄/Fe₂O₃ nanotubes, which have diameters of 78 nm and lengths of around 1 μ ...
DOI:
10.1039/c4ta00200h

19. High surface area hypercrosslinked microporous organic polymer networks based on tetraphenylethylene for CO₂ capture

Author:
Shuwen Yao; Xiao Yang; Miao Yu; Yinghua Zhang; Jia-Xing Jiang
Source:
Journal of materials chemistry A 2014 v.2 no.21 pp. 8054-8059
ISSN:
2050-7496
Subject:
alkylation; carbon; carbon dioxide; catalysts; composite polymers; copolymerization; crosslinking; ferric chloride; formaldehyde; nitrogen; porous media; sorption; surface area
Abstract:
... A series of hypercrosslinked microporous organic polymer and copolymer networks has been synthesized via Friedel–Crafts alkylation of tetraphenylethylene (TPE) and/or 1,1,2,2-tetraphenylethane-1,2-diol (TPD) using a formaldehyde dimethyl acetal crosslinker promoted by anhydrous FeCl₃. Statistical copolymerization demonstrates that the ratios of the micropore surface area and the micropore volume f ...
DOI:
10.1039/c4ta00375f

20. Highly dispersed β-NiS nanoparticles in porous carbon matrices by a template metal–organic framework method for lithium-ion cathode

Author:
Ziqi Wang; Xiang Li; Yu Yang; Yuanjing Cui; Hongge Pan; Zhiyu Wang; Banglin Chen; Guodong Qian
Source:
Journal of materials chemistry A 2014 v.2 no.21 pp. 7912-7916
ISSN:
2050-7496
Subject:
carbon; cathodes; coordination polymers; electrochemistry; nanoparticles; nickel; particle size; porosity
Abstract:
... By calcination of MOF-74(Ni) under reducing environments, nanosized Ni particles (5–10 nm) in carbon matrices were obtained, which were converted into NiS through an in situ reaction. Featuring small particle sizes (∼50 nm), uniform distribution and porosity, C ⊃ NiS was preliminarily studied as lithium-ion cathode material, which has shown electrochemical performance superior to that of bare NiS. ...
DOI:
10.1039/c4ta00367e