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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.43 Remove constraint Source: 2014 v.2 no.43
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1. 3D binder-free Cu₂O@Cu nanoneedle arrays for high-performance asymmetric supercapacitors

Author:
Chaoqun Dong; Yan Wang; Junling Xu; Guanhua Cheng; Wanfeng Yang; Tianyi Kou; Zhonghua Zhang; Yi Ding
Source:
Journal of materials chemistry A 2014 v.2 no.43 pp. 18229-18235
ISSN:
2050-7496
Subject:
capacitance; copper; copper nanoparticles; cupric oxide; cuprous oxide; electrochemistry; electrodes; energy; energy density; hydroxides; mobile telephones
Abstract:
... Nanostructured Cu oxides/hydroxides are promising materials for supercapacitors because of their high theoretical capacitance, low cost and friendliness to environment. However, the development of commercially viable Cu oxides/hydroxides with superior capacitive performance is still challenging. Here, 3D binder-free Cu₂O@Cu nanoneedle arrays electrode was developed via facile electrochemistry. The ...
DOI:
10.1039/c4ta04329d

2. A three-dimensional elastic macroscopic graphene network for thermal management application

Author:
Haining Huang; Hui Bi; Mi Zhou; Feng Xu; Tianquan Lin; Fengxin Liu; Lingyan Zhang; Hui Zhang; Fuqiang Huang
Source:
Journal of materials chemistry A 2014 v.2 no.43 pp. 18215-18218
ISSN:
2050-7496
Subject:
ambient pressure; ceramics; graphene; silica; vapors
Abstract:
... A three-dimensional elastic macroscopic graphene network (3D-GN) was prepared with the assistance of porous SiO₂ ceramic substrates by using ambient pressure chemical vapor deposition, which is suitable for thermal management application. The free standing elastic macroscopic 3D-GN possesses excellent electrical, mechanical and thermal transfer properties. ...
DOI:
10.1039/c4ta03801k

3. Better than crystalline: amorphous vanadium oxide for sodium-ion batteries

Author:
E. Uchaker; Y. Z. Zheng; S. Li; S. L. Candelaria; S. Hu; G. Z. Cao
Source:
Journal of materials chemistry A 2014 v.2 no.43 pp. 18208-18214
ISSN:
2050-7496
Subject:
batteries; cathodes; electrochemistry; energy density; nanocrystals; sol-gel processing; vanadium
Abstract:
... Amorphous and nanocrystalline vanadium pentoxide (V₂O₅) were prepared through a combination of sol–gel processing paired with electrochemical deposition and investigated as cathodes for sodium-ion batteries. Amorphous V₂O₅ demonstrated superior electrochemical properties upon sodiation as compared to its crystalline counterpart. More specifically, amorphous vanadium pentoxide had a measured capaci ...
DOI:
10.1039/c4ta03788j

4. Cobalt vanadate as highly active, stable, noble metal-free oxygen evolution electrocatalyst

Author:
Man Xing; Ling-Bin Kong; Mao-Cheng Liu; Ling-Yang Liu; Long Kang; Yong-Chun Luo
Source:
Journal of materials chemistry A 2014 v.2 no.43 pp. 18435-18443
ISSN:
2050-7496
Subject:
anodes; catalysts; catalytic activity; cobalt; cost effectiveness; crystal structure; electric power; electrochemistry; hydrogen; hydrogen fuels; nanoparticles; oxides; oxygen; oxygen production; porosity; surface area
Abstract:
... Water splitting, to produce hydrogen and oxygen, has long been considered to be a desirable option for the storage of electrical energy. The catalysts for oxygen evolution reactions (OER) are very important in this process. Herein, we have synthesized Co₃V₂O₈ nanoparticles by a simple and cost-effective technique, which have low crystallinity and large specific surface area (122.8 m² g⁻¹). Because ...
DOI:
10.1039/c4ta03776f

5. Defect induced sodium disorder and ionic conduction mechanism in Na₁.₈₂Mg₁.₀₉P₂O₇

Author:
Guandong Liu; Shin-ichi Nishimura; Sai Cheong Chung; Kotaro Fujii; Masatomo Yashima; Atsuo Yamada
Source:
Journal of materials chemistry A 2014 v.2 no.43 pp. 18353-18359
ISSN:
2050-7496
Subject:
activation energy; ambient temperature; cathodes; chemistry; cobalt; iron; magnesium; manganese; mechanics; models; sodium
Abstract:
... Phase pure sodium magnesium pyrophosphate Na₁.₈₂Mg₁.₀₉P₂O₇ was synthesized by a solid state reaction, and used as a model system to understand the Na⁺ dynamics in the related cathode materials Na₂₋ₓM₁₊ₓ/₂P₂O₇ (M = Fe, Mn, and Co). We found a three-dimensional framework structure formed by interconnecting Mg₂O₁₁ dimers with P₂O₇ pyrophosphate groups, where Na cages align along the [100] direction a ...
DOI:
10.1039/c4ta03356f

6. Facile synthesis of Pd–Mn₃O₄/C as high-efficient electrocatalyst for oxygen evolution reaction

Author:
Zhuo-Ying Li; Zi-li Liu; Jie-Cong Liang; Chang-Wei Xu; Xihong Lu
Source:
Journal of materials chemistry A 2014 v.2 no.43 pp. 18236-18240
ISSN:
2050-7496
Subject:
catalysts; electrochemistry; manganese oxides; nanoparticles; oxygen production; palladium; soot; synergism
Abstract:
... Herein, we report the use of carbon black as conducting scaffold to support highly-active Pd and Mn₃O₄ nanoparticles, and demonstrate their enhanced electroactivity for oxygen evolution reaction (OER). Benefiting from the synergistic effect, the as-prepared Pd–Mn₃O₄/carbon black catalyst showed substantially higher OER activity and stability than the Pd–Mn₃O₄ and Pd/C catalysts. ...
DOI:
10.1039/c4ta04110k

7. From biomolecule to Na₃V₂(PO₄)₃/nitrogen-decorated carbon hybrids: highly reversible cathodes for sodium-ion batteries

Author:
Ping Nie; Yaoyao Zhu; Laifa Shen; Gang Pang; Guiyin Xu; Shengyang Dong; Hui Dou; Xiaogang Zhang
Source:
Journal of materials chemistry A 2014 v.2 no.43 pp. 18606-18612
ISSN:
2050-7496
Subject:
adenosine triphosphate; ambient temperature; batteries; carbon; cathodes; electrochemistry; encapsulation; nanocrystals; nanosheets; nitrogen; phosphorus; renewable energy sources; sodium
Abstract:
... Sodium ion batteries (SIBs) working at room temperature offer promising opportunities for renewable energy storage applications because of the abundant supply and low cost of sodium, low capacity, inferior rate capability and limited cycle life remain a significant challenge in their electrochemical operations. Herein, we report the preparation of hierarchically Na₃V₂(PO₄)₃/nitrogen-decorated carb ...
DOI:
10.1039/c4ta03922j

8. Highly enhanced lithium storage capability of LiNi₀.₅Mn₁.₅O₄ by coating with Li₂TiO₃ for Li-ion batteries

Author:
Haifu Deng; Ping Nie; Haifeng Luo; Yi Zhang; Jie Wang; Xiaogang Zhang
Source:
Journal of materials chemistry A 2014 v.2 no.43 pp. 18256-18262
ISSN:
2050-7496
Subject:
X-ray diffraction; cathodes; coatings; electrochemistry; energy-dispersive X-ray analysis; hydrolysis; lithium; lithium batteries; temperature; transmission electron microscopy
Abstract:
... A uniform and thin Li₂TiO₃ layer with various amounts was coated on the surface of nanostructured LiNi₀.₅Mn₁.₅O₄ (LNMO) materials by in situ hydrolysis of tetrabutyl titanate (TBOT) followed by the lithiation process. The morphology and structure of the samples were investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM) with an energy-dispersive X-ray spectroscope (EDS) ...
DOI:
10.1039/c4ta03802a

9. Improving the performance of PEDOT-PSS coated sulfur@activated porous graphene composite cathodes for lithium–sulfur batteries

Author:
Han Li; Minqiang Sun; Tao Zhang; Yuqian Fang; Gengchao Wang
Source:
Journal of materials chemistry A 2014 v.2 no.43 pp. 18345-18352
ISSN:
2050-7496
Subject:
cathodes; chemistry; encapsulation; graphene; lithium batteries; nanopores; sulfur; surface area
Abstract:
... A novel PEDOT-PSS coated sulfur@activated porous graphene composite (PEDOT/S@aPG) is prepared by the impregnation of sulfur with aPG and encapsulation with PEDOT-PSS as the cathode material for lithium–sulfur batteries. The abundant nanopores and large surface area of aPG can provide an intimate contact and strong interaction with S species. Furthermore, the conductive PEDOT-PSS layer can facilita ...
DOI:
10.1039/c4ta03366c

10. In situ synthesis of SnO₂ nanoparticles encapsulated in micro/mesoporous carbon foam as a high-performance anode material for lithium ion batteries

Author:
Xiulin Fan; Jie Shao; Xuezhang Xiao; Xinhua Wang; Shouquan Li; Hongwei Ge; Lixin Chen; Chunsheng Wang
Source:
Journal of materials chemistry A 2014 v.2 no.43 pp. 18367-18374
ISSN:
2050-7496
Subject:
anodes; carbon; electrochemistry; electron transfer; encapsulation; foams; grinding; lithium; lithium batteries; microstructure; nanocomposites; nanoparticles; nanosheets; porous media; tin; tin dioxide
Abstract:
... SnO₂ has high capacity but poor cycling stability for Li-ion batteries due to pulverization and aggregation. Herein, we tackle these two challenges by uniformly dispersing carbon coated nanoSnO₂ into a micro-sized porous carbon matrix to form a nano-SnO₂/C composite anode using a facile and scalable in situ synthesis strategy. The SnO₂@C nanocomposite exhibits a capacity of 640 mA h g⁻¹ at 500 mA ...
DOI:
10.1039/c4ta04278f

11. Magnetic Ni and Ni/Pt hollow nanospheres and their catalytic activities for hydrolysis of ammonia borane

Author:
Wenliang Jiao; Xiaopeng Hu; Hao Ren; Pengfei Xu; Ranbo Yu; Jun Chen; Xianran Xing
Source:
Journal of materials chemistry A 2014 v.2 no.43 pp. 18171-18176
ISSN:
2050-7496
Subject:
ammonia; catalytic activity; ethanol; ethylenediamines; hydrogen production; hydrolysis; magnetic properties; magnetism; nanoparticles; nanospheres; nickel; platinum
Abstract:
... Hollow metallic nickel nanospheres have been controllably synthesized via a solvothermal reduction process. The complexation between ethylenediamine and Ni²⁺ might be the key factor to control the formation of the hollow structure through the reduction rate of Ni²⁺ at a relatively low level. The size of the hollow nanospheres could be adjusted by changing the starting ethanol/ethylenediamine volum ...
DOI:
10.1039/c4ta03949a

12. Metal hydroxides as a conversion electrode for lithium-ion batteries: a case study with a Cu(OH)₂ nanoflower array

Author:
Atin Pramanik; Sandipan Maiti; Sourindra Mahanty
Source:
Journal of materials chemistry A 2014 v.2 no.43 pp. 18515-18522
ISSN:
2050-7496
Subject:
anodes; carbon nanotubes; case studies; copper hydroxide; electrochemistry; lithium batteries; nanoflowers; oxides
Abstract:
... Conversion electrodes, the materials of choice for the next generation lithium-ion battery (LIB), are mainly limited to metal oxides. In this work, we have investigated the electrochemical performance of chemically synthesized Cu(OH)₂ nanoflower arrays. A 50 : 50 composite of Cu(OH)₂ and multiwalled carbon nanotubes (MWCNTs) showed a reversible capacity of 522 mA h g⁻¹ at a current density of 0.1 ...
DOI:
10.1039/c4ta03379e

13. Nanoconfinement of Mg₆Pd particles in porous carbon: size effects on structural and hydrogenation properties

Author:
M. Ponthieu; Y. S. Au; K. Provost; C. Zlotea; E. Leroy; J. F. Fernández; M. Latroche; P. E. de Jongh; F. Cuevas
Source:
Journal of materials chemistry A 2014 v.2 no.43 pp. 18444-18453
ISSN:
2050-7496
Subject:
X-ray absorption spectroscopy; X-ray diffraction; carbon; crystal structure; hydrogenation; magnesium; nanoparticles; particle size; sorption; thermodynamics
Abstract:
... Mg₆Pd nanoparticles as small as 4 nm have been synthesized inside the pores of porous carbon. They are formed by infiltration of Mg on previously formed Pd nanoparticles dispersed into carbon. Their crystalline structure, as evaluated by X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS), differs from bulk Mg₆Pd since their particle size is close to the large crystal cell (∼2 nm) of t ...
DOI:
10.1039/c4ta02669a

14. New zinc and bismuth doped glass sealants with substantially suppressed boron deposition and poisoning for solid oxide fuel cells

Author:
Kongfa Chen; Lihua Fang; Teng Zhang; San Ping Jiang
Source:
Journal of materials chemistry A 2014 v.2 no.43 pp. 18655-18665
ISSN:
2050-7496
Subject:
bismuth; boron; catalytic activity; cathodes; electrochemistry; electrolytes; energy; fuel cells; glass; microstructure; oxygen; poisoning; sealants; volatilization; zinc
Abstract:
... Borosilicate-based glasses are the most common sealant materials for solid oxide fuel cells (SOFCs). However, boron species vaporizing from glass sealants poison and degrade the electrocatalytic activity of cathodes of SOFCs. In this study, we report the development of a new class of glass sealants based on bismuth and zinc doped borosilicates with significantly suppressed boron volatility. Doping ...
DOI:
10.1039/c4ta02951h

15. Poly(acrylic acid) gel as a polysulphide blocking layer for high-performance lithium/sulphur battery

Author:
Sheng S. Zhang; Dat T. Tran; Zhengcheng Zhang
Source:
Journal of materials chemistry A 2014 v.2 no.43 pp. 18288-18292
ISSN:
2050-7496
Subject:
anions; batteries; cathodes; electrochemistry; energy; energy density; gels; hydrogen bonding; liquids; lithium; polyacrylic acid; sulfides; sulfur
Abstract:
... The lithium/sulphur (Li/S) battery is one of the most promising electrochemical energy storage systems after the Li ion battery, due to the high theoretical energy density and low cost of elemental sulphur. However, its development has been hindered by many problems in relation to the out-diffusion of dissolved lithium polysulphide (PS, Li₂Sₙ with 4 ≤ n ≤ 8), the series of sulphur reduction interm ...
DOI:
10.1039/c4ta04417g

16. Pt nanoparticle supported on nanocrystalline CeO₂: highly selective catalyst for upgradation of phenolic derivatives present in bio-oil

Author:
Bipul Sarkar; Chandrashekar Pendem; L. N. Sivakumar Konathala; Takehiko Sasaki; Rajaram Bal
Source:
Journal of materials chemistry A 2014 v.2 no.43 pp. 18398-18404
ISSN:
2050-7496
Subject:
X-ray absorption spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; biofuels; catalysts; catalytic activity; ceric oxide; hydrogen; hydrogenation; liquids; nanocrystals; nanoparticles; phenol; platinum; scanning electron microscopy; transmission electron microscopy
Abstract:
... Pt nanoparticle supported on nanocrystalline CeO₂ was prepared, and it was found that the catalyst can selectively hydrogenate phenolic derivatives present in bio-oil. The catalyst was characterized by XRD, XPS, ICP-AES, EXAFS, SEM and TEM. TEM micrograms confirm the presence of very small Pt nanoparticles supported on nanocrystalline CeO₂. The catalyst was found to be very effective in liquid pha ...
DOI:
10.1039/c4ta04542d

17. Rational synthesis of superparamagnetic core–shell structured mesoporous microspheres with large pore sizes

Author:
Zhenkun Sun; Qin Yue; Yong Liu; Jing Wei; Bin Li; Serge Kaliaguine; Yonghui Deng; Zhangxiong Wu; Dongyuan Zhao
Source:
Journal of materials chemistry A 2014 v.2 no.43 pp. 18322-18328
ISSN:
2050-7496
Subject:
absorbents; catalysts; cationic surfactants; cetyltrimethylammonium bromide; chemistry; magnetism; magnetite; microcystins; microparticles; nanoparticles; porosity; porous media; silica; surface area; toxicity
Abstract:
... Core–shell structured porous materials combining the functionalities of the core and shell have great application potential in various fields. Here, we report the synthesis of superparamagnetic core–shell structured microspheres which possess a core of nonporous silica-protected magnetite particle and an outer shell of ordered mesoporous silica with large pores. The synthesis adopts a co-surfactan ...
DOI:
10.1039/c4ta04414b

18. Roughness-controlled copper nanowires and Cu nanowires–Ag heterostructures: synthesis and their enhanced catalysis

Author:
Yang Sun; Fengying Zhang; Li Xu; Zhilei Yin; Xinyu Song
Source:
Journal of materials chemistry A 2014 v.2 no.43 pp. 18583-18592
ISSN:
2050-7496
Subject:
catalysts; catalytic activity; copper; copper nanoparticles; gold; graphene; hydrogels; ions; magnetism; nanocrystals; nanogold; nanosilver; nanowires; p-nitrophenol; surface roughness; synergism
Abstract:
... Effective surface and interface control of metal nanomaterials provides a powerful tool for achieving their enhanced catalytic properties. This article reports a remarkably simple approach for the preparation of copper nanowires with a rough surface. Surface roughness of Cu nanowires can be successfully controlled by adjusting the reactant ratio of the same type of element ions with different vale ...
DOI:
10.1039/c4ta03689a

19. Self-wrinkling induced by the photopolymerization and self-assembly of fluorinated polymer at air/liquid interface

Author:
Yanchang Gan; Jie Yin; Xuesong Jiang
Source:
Journal of materials chemistry A 2014 v.2 no.43 pp. 18574-18582
ISSN:
2050-7496
Subject:
X-ray photoelectron spectroscopy; air; composite polymers; contact angle; energy; liquids; photochemical reactions; polymerization; shrinkage; wavelengths
Abstract:
... Here, we investigated self-wrinkling on the surface of photo-curing systems, which comprise an acrylate cross-linker and a fluorinated copolymer. Fluorinated copolymers with low surface energy can self-assemble at the air/acrylate interface to form the top layer of the photo-curing liquid resin. The mismatch in shrinkage caused by photopolymerization between the top and bulk layer leads to the for ...
DOI:
10.1039/c4ta03811h

20. Synthesis and characterization of pure P2- and O3-Na₂/₃Fe₂/₃Mn₁/₃O₂ as cathode materials for Na ion batteries

Author:
E. Gonzalo; M. H. Han; J. M. López del Amo; B. Acebedo; M. Casas-Cabanas; T. Rojo
Source:
Journal of materials chemistry A 2014 v.2 no.43 pp. 18523-18530
ISSN:
2050-7496
Subject:
X-ray diffraction; batteries; cathodes; electric potential difference; electrochemistry; nuclear magnetic resonance spectroscopy; sodium
Abstract:
... The solid state synthesis and electrochemical characterization of pure P2- and O3-Na₂/₃Fe₂/₃Mn₁/₃O₂ have been carried out. Both phases have been characterized with XRD, solid state NMR, and ICP techniques. The initial charge capacity of the P2-phase reached 114.7 mA h g⁻¹ and was followed by a discharge capacity of 151.09 mA h g⁻¹ within the voltage range of 4.2–1.5 V at C/10. The capacity retenti ...
DOI:
10.1039/c4ta03991b