Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Electrical Power Sources

Chongqing, China

Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Electrical Power Sources

Chongqing, China
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Dong Y.,Nanyang Technological University | Chen C.,Fuzhou University | Zheng X.,Nanyang Technological University | Zheng X.,Southwest University | And 11 more authors.
Journal of Materials Chemistry | Year: 2012

A facile, low cost and high yield method has been developed to prepare single- and multi-layer graphene quantum dots (GQDs) from XC-72 carbon black by chemical oxidation. The single-layer GQDs are demonstrated to be excellent probes for cellular imaging, while the multi-layer GQDs may offer great potential applications in optoelectronic devices. © 2012 The Royal Society of Chemistry.


Xie J.L.,Southwest University | Xie J.L.,Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Electrical Power Sources | Guo C.X.,Southwest University | Guo C.X.,Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Electrical Power Sources | And 2 more authors.
Energy and Environmental Science | Year: 2014

One-dimensional (1D) nanostructures can efficiently scatter incident light, resulting in improved absorption or complete absorption for solar energy conversion and storage. However, 1D nanostructures often lack good conductivity for fast charge transfer and/or transport. A thin-layer coating of graphene gives superior conductivity for improving the charge transport ability while its highly transparency does not deteriorate the light absorption. Thus, construction of 1D nanostructured materials on graphene as an electrode to synergistically boost high-efficiency energy conversion and storage have attracted great attention in recent years. In this feature review, starting with general concepts of 1D nanostructures on a substrate, various advanced methods for the design, fabrication and characterization of different 1D nanostructures comprising inorganic, organic and hybrid materials built on graphene are systematically surveyed. In particular, the significant progress in fabrication strategies, superior nanostructures and unique architectures is discussed, while the excellent electrical, optical, mechanical, and electrochemical properties of the nanostructured composites as well as their important applications in lithium-ion batteries, supercapacitors, solar cells, light-emitting diodes and nanogenerators are also presented. The enhancement mechanisms for the efficient energy conversion and storage are highlighted to elicit scientific insights. The challenges and prospects are also deliberated to spark our future researches. This review provides critical and updated knowledge for researchers to further explore new 1D-structured materials on graphene and their important applications in energy conversion and storage. This journal is © the Partner Organisations 2014.


Liu R.,Southwest University | Liu R.,Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Electrical Power Sources | Gu S.,Southwest University | Gu S.,Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Electrical Power Sources | And 4 more authors.
Journal of Materials Chemistry A | Year: 2014

For the first time, self-supported FeP nanorod arrays were developed on a HCl-treated Ti foil (FeP NAs/Ti) via low-temperature phosphidation of α-FeO(OH)/Ti precursor and were further used as a novel hydrogen evolution cathode (HER), demonstrating exceptional catalytic activity in acidic media, superior to all reported non-Pt HER electrocatalysts, while offering an innovative method to synthesize metal phosphides with well-controlled nanostructure and morphology. This journal is © the Partner Organisations 2014.


Zhang J.,Nanyang Technological University | Guo C.,Southwest University | Guo C.,Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Electrical Power Sources | Zhang L.,Southwest University | And 4 more authors.
Chemical Communications | Year: 2013

Three-dimensional manganese oxide is directly grown on reduced graphene oxide (RGO) sheets, exhibiting comparable catalytic activity, higher selectivity and better stability towards oxygen reduction reaction than those of the commercial Pt/XC-72 catalyst. © 2013 The Royal Society of Chemistry.


Chen T.,Nanyang Technological University | Chen T.,Chinese University of Hong Kong | Hu W.,Nanyang Technological University | Hu W.,Southwest University | And 6 more authors.
Advanced Functional Materials | Year: 2012

The microstructures of photoa and countera electrodes play critical roles in the performance of dyea sensitized solar cells (DSSCs). In particular, various interfaces, such as fluorinateda tin oxide (FTO)/TiO2, TiO2/TiO2, and TiO2/electrolyte, in DSSCs significantly affect the final power conversion efficiency (PCE). However, research has generally focused more on the design of various nanostructured semiconducting materials with emphasis on optimizing chemical or/and physical properties, and less on these interface functionalizations for performance improvement. This work explores a new application of graphene to modify the interface of FTO/TiO2 to suppress charge recombination. In combination with interfaces functionalization of TiO2/TiO2 for low chargea transport resistance and high chargea transfer rate, the final PCE of DSSC is remarkably improved from 5.80% to 8.13%, achieving the highest efficiency in comparison to reported graphene/TiO2-based DSSCs. The method of using graphene to functionalize the surface of FTO substrate provides a better alternative method to the conventional prea treatment through hydrolyzing TiCl4 and an approach to reduce the adverse effect of microstructural defect of conducting glass substrate for electronic devices. Graphene is found to suppress carrier recombination occurring on fluorinated tin oxide (FTO) surfaces and at FTO/TiO2 interfaces in dyea sensitized solar cells. With a graphene interlayer between FTO and TiO2, the device efficiency can be increased by 40% when compared with those using solely TiO2 as an anode material. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Guo C.X.,Southwest University | Guo C.X.,Nanyang Technological University | Shen Y.Q.,Nanyang Technological University | Dong Z.L.,Nanyang Technological University | And 5 more authors.
Energy and Environmental Science | Year: 2012

Through the PO4 3- groups regularly arranged on its sugar-phosphate backbone, DNA is used to direct the growth of a network structure of ultrasmall FePO4 nanoparticles on double-wall carbon nanotubes. The resulting structure has achieved nearly 100% theoretical storage capacity for the FePO4 active component as a cathode in lithium-ion batteries. © 2012 The Royal Society of Chemistry.


Guai G.H.,Nanyang Technological University | Guai G.H.,Globalfoundries | Li Y.,Nanyang Technological University | Ng C.M.,Globalfoundries | And 4 more authors.
ChemPhysChem | Year: 2012

Different types of single-walled carbon nanotubes (SWCNTs), pristine (p-), metallic (m-) and semiconducting (s-) are incorporated into TiO 2 photoanodes to improve the dye-sensitized solar-cell (DSSC) performance and their effects on the device performance are further investigated. Although all three types of SWCNTs are found to have comparable structural morphologies and a reduced charge transport resistivity for the photoanodes, only the semiconducting one was able to suppress charge-recombination events, resulting in even greater improvement of DSSC performances. This is very likely to be ascribed to the higher energy barrier of s-SWCNTs compared to both m- and p-SWCNTs to block the back flowing of dye-injected electrons for I 3 - reduction in the charge recombination process. Photoanodes based on TiO 2 with either pristine (p-), metallic (m-), or semiconducting (s-) single-walled carbon nanotubes (SWCNTs) are prepared and characterized. The mobility of s-SWCNTs and their suppression of charge recombination towards I 3 - redox species (see picture) allow a more positive synergistic influence over the charge separation/ collection within TiO 2 films while p- and m-SWCNTs tend to accelerate charge recombinations. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Yuan W.,Southwest University | Lu Z.,Southwest University | Lu Z.,Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Electrical Power Sources | Wang H.,Nanyang Technological University | And 2 more authors.
Physical Chemistry Chemical Physics | Year: 2013

Great challenges still remain to assemble metal nanoparticles on a substrate with tunability, high density, robust stability, good dispersion and well-retained properties for various applications. Herein a new concept using a polymer thin-film as a sacrificial template is investigated to fabricate highly dense and well-dispersed nanoparticle arrays. In contrast to a conventional "hard" template, the polymer template is a porous multilayered film allowing in situ growth of Au nanoparticles with a restricted ripening mode, and tuning the nanoparticle size and density of the arrays is possible by simply adjusting the loading conditions. The prepared substrate-attached nanoparticle arrays demonstrate good thermal and chemical stability, while offering highly sensitive and tunable localized surface plasmon resonance (LSPR) refractive index sensing with a broad linear dynamic range. This method could be extended to controllably fabricate other robust and "clean" nanoparticle arrays on various substrates for various applications including sensing, catalysis and optoelectronics. This journal is © 2013 the Owner Societies.


Zheng X.T.,Southwest University | Zheng X.T.,Nanyang Technological University | Zheng X.T.,Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Electrical Power Sources | Chen P.,Nanyang Technological University | And 3 more authors.
Small | Year: 2012

Subcellular-targeted drug delivery has much potential to defeat infectious diseases and cancers. Medical and/or biochemical effects of drugs/bioactive molecules delivered to subcellular compartments and their subcellular sites of action need to be investigated but have not been explored. Here the subcellular location-dependent biochemical responses of a potent anticancer drug, β-lapachone (β-lap), is investigated by a reduced graphene oxide (rGO)-functionalized optical nanoprobe, which can deliver and simultaneously monitor the drug effects at nanoscales. For the first time, distinct oxidative responses and calcium alterations in three selected subcellular domains are observed and clearly pinpoint that the perinuclear region is the optimal subcellular site for β-lap to have the best anticancer efficacy. The results presented here provide not only scientific insights of subcellular drug-cell interaction that is not obtainable from conventional methods, but they also provide valuable knowledge for rational design of subcellular-targeted delivery or spatially resolved signal intervention. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Zhang L.Y.,Southwest University | Zhang L.Y.,Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Electrical Power Sources | Guo C.X.,Southwest University | Guo C.X.,Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Electrical Power Sources | And 6 more authors.
Chemistry - A European Journal | Year: 2012

Unique DNA-promoted Pd nanocrystals on carbon nanotubes (Pd/DNA-CNTs) are synthesized for the first time, in which through its regularly arranged PO 43- groups on the sugar-phosphate backbone, DNA directs the growth of ultrasmall Pd nanocrytals with an average size of 3.4 nm uniformly distributed on CNTs. The Pd/DNA-CNT catalyst shows much more efficient electrocatalytic activity towards oxygen reduction reaction (ORR) with a much more positive onset potential, higher catalytic current density and better stability than other Pd-based catalysts including Pd nanocrystals on carbon nanotubes (Pd/CNTs) without the use of DNA and commercial Pd/C catalyst. In addition, the Pd/DNA-CNTs catalyst provides high methanol tolerance. The high electrocatalytic performance is mainly contributed by the ultrasmall Pd nanocrystal particles grown directed by DNA to enhance the mass transport rate and to improve the utilization of the Pd catalyst. This work may demonstrate a universal approach to fabricate other superior metal nanocrystal catalysts with DNA promotion for broad applications in energy systems and sensing devices. In the right direction: A facile approach to fabricate Pd-based catalysts in which DNA directs the growth of ultrasmall Pd nanocrystals uniformly distributed on carbon nanotubes (Pd/DNA-CNTs; see TEM image) is demonstrated. The Pd/DNA-CNT catalyst shows efficient performance and stability towards oxygen reduction reactions with good methanol tolerance. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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