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Sponsored by the Center for Science and Technology Development of the Ministry of Education
Supervised by Ministry of Education of the People's Republic of China
Abstract:Effect of heat treatment on the activity of nickel phthalocyanine (NiPc) catalysts for oxygen reduction reaction (ORR) was studied in both acid and alkaline electrolytes. The catalytic activity was found to depend strongly on the electrolyte and heat treatment temperature. High ORR activity was demonstrated on 40%NiPc/C electrode in 0.1M KOH solution, and the heat-treatment of 800oC is optimal for the catalyst synthesized. Further using rotating disk electrode (RDE) measurements and Koutechy-Levich analysis, the overall electron transfer number in the catalyzed ORR on 40%NiPc/C was found to be 2.8, suggesting the catalyzed ORR proceeds via both the 2e- transfer reduction and the 3e- transfer reduction.
TO cite this article:Ding Lei,Qiao Jinli. Effect of heat treatment on the activity of nickel phthalocyanine catalysts for oxygen reduction reaction in acid and alkaline electrolytes[J].
Abstract:This work reports the preparation and characterization of novel non-precious metal catalysts metal catalysts supported on carbon, M (M = Fe, Co, Ce, W )N/C, using a solvent-milling method followed by a heat-treatment at elevated temperature, where pyridine is used as the N-rich ligand for precursor complex formation. The morphology and composition of the catalysts were characterized by Fourier-transform infrared (FT-IR) spectra and thermal analysis (TGA). The catalytic activity on oxygen reduction reaction (ORR) was found to depend strongly on the heat-treatment temperatures and the metal pressures for catalyst synthesis. The resulting MPy/C of 40/60 ratio heat-treated at 800oC shows the best catalytic performance in terms of ORR and follows the order: Co > Fe > Ce > W, where the catalyst composed of Co10wt% -Py30wt%/C shows the highest electroactivity for ORR in alkaline media. Using Rotating disk electrode measurements and Koutechy-Levich analysis, the overall electron transfer number in the catalyzed ORR on Co10wt% -Py30wt%/C was found to be 3.8, suggesting the catalyzed ORR is a 4-electron transfer process from O2 to H2O.
TO cite this article:QIAO Jinli,DING Lei,XU Li, et al. Electrochemical reduction of oxygen on nano-structured M (M = Fe, Co, Ce, W)Py/C in alkaline electrolyte[J].
Abstract:A novel method was achieved for directed aligning high organized single-walled carbon nanotubes (SWNTs) over large areas using a template-based fluidic assembly process. Lithographically patterned Polydimethylsiloxane (PDMS) template was used to guide the fluidic self-assembly of SWNTs on SiO2/Si substrates. The electrical characteristics of the assembled nanotubes were investigated. In our work, the field effect transistors (FET) were P-type with an On/Off ratio of 106. The developed alignment process was propitious to build SWNTs-based electronics in a large scale with high sensitivity, little response time and wide temperature range. The concentration and length of SWNTs suspension, the width and shape of PDMS channels were also discussed.
TO cite this article:YANG Danna,WANG Lin,Wang Dongwei, et al. Template guided fluidic assembly of single-walled carbon nanotubes in micro-channels[OL].[ 1 November 2011] http://en.paper.edu.cn/en_releasepaper/content/4448077
Abstract:Room Temperature Ionic Liquid 1-ethyl-3-methyl-imimidazolium hexafluorophosphate [BMIM]PF6 was prepared in two reactors by new mild simplified synthetic route.The stable potential windows were tested by linear potential sweep on GCE glassy carbon electrode. Cyclic voltammetry and potential step were used to test the electrochemical performance of ionic liquid electrolytes on GCE. The result shows that the synthesis production rate is above 90%, synthesis method simple feasible achieves , [BMIM]PF6 may be served as electrolyte solvent.
Abstract:A fluorescence resonance energy transfer (FRET) based fluorescent 1,1’-bisnaphthal (BINOL) boronic acid chemosensor was designed in which BINOL moiety acts as energy donor and a second fluorophore of anthracene as the energy acceptor. The new sensor demonstrated the characteristic enhancement/diminishment response profile and emits at red-shifted wavelength (420 nm) than a previously reported BINOL-boronic acid sensor (emits at 358 nm )
TO cite this article:HanFeng,Yubo Wu,Xin Zhang, et al. An Enantioselective BINOL Fluorescent Chemosensor Based on Fluorescent Resonance Energy Transfer (FRET)[OL].[ 5 August 2009] http://en.paper.edu.cn/en_releasepaper/content/34291
Abstract:A novel Zn(II) complex, [Zn(Cl4phen)2(H2O)2](NO3)2•CH3CH2OH(1) (Cl4phen= 3,4,7,8-tetrachloro-1,10-phenanthroline), has been synthesized, and characterized by elemental analysis, 1H-NMR, FT-IR, thermogravimetric analysis and photoluminescence studies and its single crystalline determined by single crystal X-ray diffraction. It reveals that the single crystalline crystallizes in the monoclinic system, with space group P2(1)/c, a=10.061(2) Å, b=18.924(4) Å, c=18.189(4) Å, β=100.94(3)°, and Z=4. Complex (1) consists of cationic species [Zn(Cl4phen)2(H2O)2]2+, NO3- and CH3CH2OH. The zinc atom displays a distorted cis-N4O2 octahedral geometry. Via extended Zn-O-H…O-N-O…H-O-Zn bridge, every mononuclear unit is linked with other ones to form one-dimensional (1D) infinite chain of hydrogen bond system. Three-dimensional (3D) polymeric network arrangement is built via weak C-H…O and π-stacking interactions between Cl4phen moieties. Spectroscopic properties suggest that complex (1) has a solvent-dependency effect.
TO cite this article:Qianli Qian,Change Zheng,Yanfu Liu, et al. Synthesis, crystal structure and characterizations of new 3,4,7,8-tetrachloro-1,10-phenanthroline Zn(II) complex[OL].[26 June 2009] http://en.paper.edu.cn/en_releasepaper/content/33457
Abstract:The periodically forced Brusselator model displays temporal mixed-mode and quasi-periodic oscillations, period-doubling and chaos. We explore the behavior of such media as reaction-diffusion systems for investigating spiral instabilities. Besides near-core breakup and far-field breakup resulting from unstable modes in the radial direction or Doppler-induced instability (destabilization of the core’s location), the observed scenarios include backfiring, spiral regeneration and amplitude modulation from line defects. Amplitude modulation of spirals can evolve to chambered spirals resembling those found in nature, such as pinecones and sunflowers. When the forcing amplitude is increased, the spiral-tip meander evolves from simple rotation to complex petals, corresponding to transformation of the local dynamics from simple oscillations to mixed-mode, period-2 and quasi-periodic oscillations. The number of petals is related to the complexity of the mixed-mode oscillations. Spiral turbulence, standing waves and homogeneous synchronization permeate the entire system when the forcing amplitude is further increased.
TO cite this article:Li Jun,Zhang Kailong,Tang Xiaodong, et al. Spiral Instability in Periodically Forced Reaction-Diffusion Brusselator Model[OL].[25 May 2009] http://en.paper.edu.cn/en_releasepaper/content/32507
Abstract:Al2O3 nanoparticle have been prepared by polyethylene glycol octylphenyl ether(Triton X-100)/n-butyl alcohol/cyclohexane/water W/O reverse microemulsion. The result of thermal analysis of the precursor products showed the proper calcination temperature was 1150 ℃. Structures and morphologies of Al2O3 nanoparticles were characterized by X-ray powder diffraction(XRD)、Transmission electron microscope(TEM) and US-VIS spectra. The influences of molar ratio of water to surfactant (ωo), calcination temperature and other key factors on the morphologies and the sizes of the Al2O3 nanoparticles were studied. The results show that we have successfully solve the agglomeration of nanoparticles. The formation mechanisms of Al2O3 nanoparticles in the reverse microemulsion were also discussed.
TO cite this article:Yin Liangguo,Huang Kelong,Liu Suqin, et al. Study on Preparation and Formation Mechanisms of Al2O3 Nanoparticles by Reverse Microemulsion[OL].[ 2 November 2006] http://en.paper.edu.cn/en_releasepaper/content/9214
Abstract:Oxymethylene-linked polyoxyethylene multi-block polymer was synthesized by condensing dichloromethane with poly (ethylene glycol) (PEG) of different molecular weight in the presence of potassium hydroxide power. The ionic conductivity of the block-polymer prepared with the PEG mixture of different average molecular weight, PEG400 and PEG600, is higher than it of which prepared with only a kind of molecular weight of polyethylene glycol (PEG), such as PEG400 or PEG600. There is one order of magnitude increase in the ionic conductivity at the room temperature. The complexation has been confirmed using FT-IR spectral studies. Ionic conductivity of gel composite electrolyte was studied with temperature. The gel polymer electrolyte systems based on block-polymer-nanoparticles appear very promising for all-solid-state complementary electrochromic devices because of high transmittance in the visible light region.
TO cite this article:Zhang Shupeng,Fu Xiangkai ,Gong Yongfeng . Nanocomposite electrolytes in Oxymethylene-linked Polyoxyethylene Multi-block Polymer: FT-IR, Spectral transmittance and Conductivity studies[OL].[29 March 2006] http://en.paper.edu.cn/en_releasepaper/content/5973
Abstract:The free-standing, hexagonal GaN micropyramid/nanowire homostructures have been successfully synthesized in a large scale by a facile carbon-assisted thermal reduction route. The product was investigated using SEM, XRD, TEM, EDS, SAED, Raman and PL. The pyramids have lengths of 5~8 μm, and the maximal lateral size of 2~3μm, exhibiting the growth characteristic of hexagonal crystal along c-axis. A single nanowire is grown out from the end tip of the pyramid along <0001> growth direction, indicating its epitaxial relationship with the pyramid. Raman studies reveal the characteristics of the hexagonal structure and high-crystallinity of the product. The room temperature PL spectrum displays strong band-edge emission centered at 372nm. The slight redshift originates from N vacancies caused by Ga-rich growth conditions. The formation mechanism was also discussed. The unique micro/nano structures are good entities for the investigation of fundamental physical phenomenon and also as building blocks for functional nanodevices.
TO cite this article:Xu Xiang,Chuanbao Cao,Yajie Xu, et al. Large-scale Synthesis and Optical Properties of Hexagonal GaN Micropyramid/Nanowire Homostructures[OL].[23 December 2005] http://en.paper.edu.cn/en_releasepaper/content/4603
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