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1. Study on the preparation of submicron diamond powders by Plasma Electrolysis in 1-propanol solutions | |||
DENG Lihua,YAN Zongcheng,CHEN Li | |||
Chemistry 05 April 2012 | |||
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Abstract:Submicron diamond powders were synthesized by plasma electrolysis (PE) in 1-propanol solutions without catalysts. The yields and structures of solid phase products were studied. The compositions and structures of the solid products were characterized by X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, Fourier transformation infrared (FTIR) spectroscopy and transmission electron microscopy (TEM). The results show that the yields of solid products increased with the increment of 1-propanol solutions concentration, discharged voltage and discharged time. The solid products were mainly composed of submicron diamond. The groups of C-O-C, C-C, CH2 and CH3 were determined from the FTIR analysis. The presence of sp2 and sp3 carbon hybridization were confirmed by XPS. The Raman spectroscopy indicated that the first order Raman shift G mode and D mode of submicron diamond were located around 1332 cm-1 and 1580 cm-1, respectively. D mode was accelerated toward to lower wave numbers with the increasing of discharged time and discharged voltage. The intensity ratio ID/IG decreased with the increment of discharged voltage, and discharged time, respectively. This study proved the PE process could be used to prepare submicron diamond. | |||
TO cite this article:DENG Lihua,YAN Zongcheng,CHEN Li. Study on the preparation of submicron diamond powders by Plasma Electrolysis in 1-propanol solutions[OL].[ 5 April 2012] http://en.paper.edu.cn/en_releasepaper/content/4474197 |
2. Electrochemical introduction of active sites into super-long carbon nanotubes for enhanced capacitance | |||
Hu Yue,Zhao Yang,Li Yan,Xie Xuejun,Li Hui,Dai Liming,Qu Liangti | |||
Chemistry 31 January 2011 | |||
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Abstract:Electrochemical cyclic voltammetric (CV) scan was applied to induce the partial oxidation and defect formation along carbon nanotubes (CNTs). The electrochemically induced functional groups and physical defects were demonstrated to show positive effects on the nanotube capacitance, as exemplified by super-long CNT arrays as model for easy fabrication of the CNT electrodes. Specifically, the initial hydrophobic nanotube surface became hydrophilic and a ten-time enhancement in capacitance was observed with respect to the pristine CNT sample. Thus, the electrochemical CV pretreatment could be used as an effective approach to activate the CNT surface for an enhanced electrochemical performance in capacitors, and many other advanced devices beyond capacitors, such as electrochemical sensors and batteries. | |||
TO cite this article:Hu Yue,Zhao Yang,Li Yan, et al. Electrochemical introduction of active sites into super-long carbon nanotubes for enhanced capacitance[OL].[31 January 2011] http://en.paper.edu.cn/en_releasepaper/content/4409972 |
3. On the reactivity of Pt/H2O interface in the catalyst layer of PEMFCs | |||
Jun He,Shengli Chen,Yuwen Liu,He Rui | |||
Chemistry 09 January 2009 | |||
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Abstract:The reactivity of Pt not in direct contact with solid electrolyte in the catalyst layer of PEMFCs is evaluated by investigating the distributions of proton concentration and electric potential in the interfacial region between Nafion membrane and water using Poisson-Boltzmann theory. It is shown that a depletion of proton concentration ( ) occurs within a thickness of about 0.2nm on the Nafion side of the interface. Away from the interface in water phase, the value of is about 0.02M at distance of 1nm and proton concentrations of ~0.001M are still seen at distances within 10 nm to the Nafion/H2O interface. This means that the water adjacent to the Nafion in the catalyst layers of PEMFCs may be significantly acidified to serve as acidic electrolyte. The catalyst surface that is separated from Nafion component in nanometer scales in the catalyst layer is thus likely to be accessible to fuel cell reactions by forming electrochemical interface with the acidified water. | |||
TO cite this article:Jun He,Shengli Chen,Yuwen Liu, et al. On the reactivity of Pt/H2O interface in the catalyst layer of PEMFCs[OL].[ 9 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27565 |
4. Fabrication of sponge-like nanoporous platinum electrocatalysts for oxygen reduction through alloying and dealloying processes | |||
Jiang Ming,Lin Xiangqin,Zhang Zhixiang | |||
Chemistry 13 March 2008 | |||
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Abstract:A novel sponge-like spherical nanoporous platinum (NPs-Pt) was generated through a facile way of electrodeposition followed by chemical etching at room temperature. First, a Pt-Cu alloy nanoparticles was electrodeposited on a glassy carbon electrode (GCE) using cyclic voltammetry (CV), and then Cu was etched off from the alloy in HNO3. FE-SEM, XPS, EIS and CV were used for characterization. Optimal conditions for the preparation were investigated. The NPs-Pt modified electrode (NPs-Pt/GCE) exhibited excellent electrocatalytic activity toward the oxygen reduction reaction (ORR). Moreover, the peak current of ORR at NPs-Pt/GCE was 4 times higher than that correspondingly prepared Pt nanoparticles modified electrode, showing much higher current sensitivity. The preparation method for the sponge-like nanoporous structure and the NPs-Pt modified electrode can be expected to have promising applications in the field of fuel cells and biosensors, etc. | |||
TO cite this article:Jiang Ming,Lin Xiangqin,Zhang Zhixiang. Fabrication of sponge-like nanoporous platinum electrocatalysts for oxygen reduction through alloying and dealloying processes[OL].[13 March 2008] http://en.paper.edu.cn/en_releasepaper/content/19286 |
5. Influence of CoSi on the electrochemical hydrogen storage properties of MgNi alloy | |||
Yanhui Zhang,Lifang Jiao,Huatang Yuan,Yunyun Zhang,Li Liu,Yijing Wang | |||
Chemistry 21 January 2008 | |||
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Abstract:MgNi and MgNi-CoSi were synthesized by mechanical alloying. The structural and electrochemical properties of the materials were investigated systematically. The results of structural test show that MgNi-CoSi has a better amorphous structure than MgNi. Charge-discharge studies show that the maximum discharge capacities of the alloy electrodes decrease but the cycle stabilities are improved remarkably with the introduction of CoSi. MgNi-CoSi which MA 10 h, performs the best among the as-prepared materials, the discharge capacity retention ratio is 57.6% at cycle 30, and that of MgNi is only 22.2%. Electrochemical impedance spectroscopy and liner polarization studies indicate that the electrochemical kinetics of MgNi is improved by CoSi. Potentiodynamic polarization curves show that the rate of corrosion of the MgNi-CoSi decreases. In conclusion, CoSi adding is an effective way to improve the cycle life of MgNi. | |||
TO cite this article:Yanhui Zhang,Lifang Jiao,Huatang Yuan, et al. Influence of CoSi on the electrochemical hydrogen storage properties of MgNi alloy[OL].[21 January 2008] http://en.paper.edu.cn/en_releasepaper/content/18234 |
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