The selectivity of the CO photoreduction reaction in the presence of water vapour can be modulated by the band structure of a g-C N photocatalyst. The major products obtained using bulk g-CN with a bandgap of 2.77 eV and g-CN nanosheets with a bandgap of 2.97 eV are acetaldehyde (CH CHO) and methane (CH), respectively. © the Partner Organisations 2014.

Ping Niu    Yang Yongqiang    Yu Jimmy C.    Gang Liu    成会明    

Chemical Communications

2014

Flexible transparent conductive films (TCFs) are vital to promote the development of flexible and foldable devices including touch panels, displays, organic solar cells, etc. We have prepared a large-area, flexible, and color-neutral single-wall carbon nanotube:sodium dodecylbenzene sulfonate/poly-(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (SWCNT:SDBS/PEDOT:PSS) composite TCF on a poly(ethylene terephthalate) substrate by a spray coating method. The TCF has a sheet resistance of 178 Ω sq with 85% transmittance at 550 nm. The light transmission characteristics of the films can be tuned by changing the mass fraction of SWCNTs. When the mass fraction of SWCNTs is higher than 4 wt.%, the original blue tint of the TCFs has disappeared. More importantly, we find that SDBS may play a more important role than the SWCNT network in improving the electrical conductivity of the films by acting as a secondary dopant of PEDOT:PSS, which is different from the traditional understanding and existing explanation about the conduction mechanism of PEDOT:PSS-based composite films. © 2014 Elsevier Ltd. All rights reserved.

Liu Wen-Bin    Jinhong Du    Ma Lai-Peng    Zhu Hefei    成会明    

Carbon

2014

Flexible transparent conductive films (TCFs) are vital to promote the development of flexible and foldable devices including touch panels, displays, organic solar cells, etc. We have prepared a large-area, flexible, and color-neutral single-wall carbon nanotube:sodium dodecylbenzene sulfonate/poly-(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (SWCNT:SDBS/PEDOT:PSS) composite TCF on a poly(ethylene terephthalate) substrate by a spray coating method. The TCF has a sheet resistance of 178 X sq1 with 85% transmittance at 550 nm. The light transmission characteristics of the films can be tuned by changing the mass fraction of SWCNTs. When the mass fraction of SWCNTs is higher than 4 wt.%, the original blue tint of the TCFs has disappeared. More importantly, we find that SDBS may play a more important role than the SWCNT network in improving the electrical conductivity of the films by acting as a secondary dopant of PEDOT:PSS, which is different from the traditional understanding and existing explanation about the conduction mechanism of PEDOT:PSS-based composite films.

Liu Wen-Bin    Jinhong Du    Laipeng Ma    Zhu Hefei    成会明    

Carbon

2014

Flexible transparent conductive films (TCFs) are vital to promote the development of flexible and foldable devices including touch panels, displays, organic solar cells, etc. We have prepared a large-area, flexible, and color-neutral single-wall carbon nanotube:sodium dodecylbenzene sulfonate/poly-(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (SWCNT:SDBS/PEDOT:PSS) composite TCF on a poly(ethylene terephthalate) substrate by a spray coating method. The TCF has a sheet resistance of 178 X sq1 with 85% transmittance at 550 nm. The light transmission characteristics of the films can be tuned by changing the mass fraction of SWCNTs. When the mass fraction of SWCNTs is higher than 4 wt.%, the original blue tint of the TCFs has disappeared. More importantly, we find that SDBS may play a more important role than the SWCNT network in improving the electrical conductivity of the films by acting as a secondary dopant of PEDOT:PSS, which is different from the traditional understanding and existing explanation about the conduction mechanism of PEDOT:PSS-based composite films.

Liu Wen-Bin    Jinhong Du    Laipeng Ma    Zhu Hefei    成会明    

Carbon

2014

Tadpole-like carbon nanotubes (CNTs) were synthesized by chemical vapor deposition from ethanol using TiO nanoparticles (NPs) as catalyst. The CNTs have a cup-stacked structure are typically less than 500 nm in length, and have a non-uniform diameter with a big "head" and a smaller diameter "tail", inside which a catalyst NP is usually encapsulated. Transmission electron microscopy (TEM) characterisation reveals that the TiO catalyst NPs are oxygen-deficient, which is considered to be responsible for the gradually diminishing diameter of the CNTs. In situ TEM study further confirms that the effective catalytic species is solid oxygen-deficient titanium oxide. A tip growth mode combined with vapor-solid-solid mechanism is proposed for the growth of the CNTs. © 2012 Elsevier Ltd. All rights reserved.

Li li ZHANG    Changlin Liu    Bilu Liu    Wanjing Yu    Pengxiang Hou    成会明    

Carbon

2013

Double-walled carbon nanotubes (DWCNTs) were synthesized by a metal-catalyst-free chemical vapor deposition method using silicon oxide nanoparticles as a catalyst. The diameters and lengths of the DWCNTs are in the ranges of 3-5 nm and 1-5 μm, respectively. The amount of DWCNTs produced is about 70%, while the remainder is single-walled carbon nanotubes. A heat treatment of the SiO/Si substrate used was found to be crucial for controlling the size of the catalyst nanoparticles, and hence for the growth of the DWCNTs. Flat or cone-shaped caps were observed for the DWCNTs, indicating that the growth of the DWCNTs from the non-metal catalyst follows a vapor-solid-solid mechanism. Energy dispersive spectroscopy and X-ray photoelectron spectroscopy characterizations confirmed that no metal impurity exists in the obtained DWCNT samples. © 2013 Elsevier Ltd. All rights reserved.

Liu Tian-Yuan    Li li ZHANG    Wanjing Yu    Shisheng Li    Pengxiang Hou    Cong Hongtao    Chang Liu    成会明    

Carbon

2013

Maximized energy density: Controlled electrochemical charge injection (ECI) can be used for maximizing the energy density of supercapacitors (SCs). The electrode potential is tuned by the surface chemical structure of the electrode material to increase both the working voltage and the specific capacity of the SCs. As a result, the energy density of carbon SCs is significantly improved close to the level of lithium-ion batteries (see picture). Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Zhe Weng    Feng Li    汪大伟    温磊    成会明    

Angewandte Chemie - International Edition

2013

We report the template-free synthesis of Ta3N5 nanorod array films grown on Ta foil by a combination of a vapor-phase hydrothermal process and subsequent nitriding. The Ta3N5 nanorod array film modified with Co(OH)x when used as a photoanode in a photoelectrochemical cell for water splitting yields a stable photocurrent density of 2.8 mA cm^-2 at 1.23 VRHE under AM 1.5G simulated sunlight. The incident photon-to-current conversion efficiency at 480 nm is determined to be 37.8%. © The Royal Society of Chemistry.

Zhen Chao    王连洲    Gang Liu    逯高清    成会明    

Chemical Communications

2013

We explore a hybrid material consisting of SnO nanoparticles (NPs) embedded in the porous shells of carbon cages (SnO-PSCC). The hybrid material exhibits improved kinetics of lithiation-delithiation and high reversible capacity, and excellent cyclic stability without capacity loss over 100 cycles at 500 mA g with a coulombic efficiency close to 100% after the initial cycle. This can be ascribed to the high electrical conductivity, the hierarchical porosity and the confinement effect of the PSCC on the volume change of SnO NPs. The material has a large reversible capacity of 460 mA h g at a high current density of 5 A g due to a short ion diffusion length in the bulk and large number of inter-pore ion transport channels. These results provide insight into improving the lithium storage performance of SnO by facilitating the reaction kinetics and indicate that this hybrid material has great potential for use in high-rate and durable lithium ion batteries. © 2013 The Royal Society of Chemistry.

Guangmin Zhou    汪大伟    Lü Li    Na Li    Feng Li    成会明    

Nanoscale

2013

Anatase TiO nanocrystals doped with nitrogen and sulfur, where substitutional N and S atoms for lattice O, respectively, locate in the bulk and the surface layer of the crystals, were designed and prepared. As a result of remarkably lowered electronic resistance, the N/S doped TiO shows a superior high rate lithium storage capability to that of reference TiO nanocrystals, though the former has a larger particle size. © 2013 The Royal Society of Chemistry.

Jiao Wei    Na Li    王连洲    温磊    Feng Li    Gang Liu    成会明    

Chemical Communications

2013