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Yi F.,South China Normal University | Chen H.,Educ And Res On Ener Storage And Pwr Battery Of Guangdong Higher Educ Institutes | Li H.,South China Normal University
Journal of Fuel Cell Science and Technology | Year: 2014

The La0.3Sr0.55Ti0.9Cr0.1O 3-δ (LSTC10) anode material was synthesized by citric acid-nitrate process. The yttria-stabilized zirconia (YSZ) electrolyte-supported cell was fabricated by screen printing method using LSTC10 as anode and (La0.75Sr0.25)0.95MnO3-δ (LSM) as cathode. The electrochemical performance of cell was tested by using dry hydrogen as fuel and air as oxidant in the temperature range of 800-900°C. At 900°C, the open circuit voltage (OCV) and the maximum power density of cell are 1.08 V and 13.0 mW·cm-2, respectively. The microstructures of cell after performance testing were investigated by scanning electron microscope (SEM). The results show that the anode and cathode films are porous and closely attached to the YSZ electrolyte. LSTC10 is believed to be a kind of potential solid oxide fuel cell (SOFC) anode material. Copyright © 2014 by ASME. Source


Yi F.,South China Normal University | Li H.,South China Normal University | Chen H.,Educ And Res On Ener Storage And Pwr Battery Of Guangdong Higher Educ Institutes | Chen H.,South China Normal University | And 2 more authors.
Ceramics International | Year: 2013

Using citric acid-nitrate process, La and Cr co-doped A-site deficient SrTiO 3 (LSTC) materials were synthesized. The single-phase perovskite structure of LSTC materials can be obtained in airy atmosphere when the dopant content of chromium does not exceed 20 mol%. The LSTC material has excellent chemical compatibility with yttria-stabilized zirconia (YSZ) at 1400 °C. The particle diameters of LSTC powders calcined at 800 °C are all less than 60 nm. The LSTC pellet sintered in air at 1400 °C for 5 h shows a highly densified microstructure composed of polyhedral grains on a micron scale. At 800 °C, the conductivity of LSTC20 pellet is 1.96×10 -3 S/cm in static air. The conduction activation energy of LSTC20 pellet is calculated to be 0.33 eV in the temperature range of 550-800 °C. The LSTC can be considered as a potential candidate anode material for SOFC with YSZ as electrolyte, but its conductivity needs to be further improved. © 2012 Elsevier Ltd and Techna Group S.r.l. Source


Hao J.,South China Normal University | Shu D.,South China Normal University | Shu D.,Educ And Res On Ener Storage And Pwr Battery Of Guangdong Higher Educ Institutes | Guo S.,South China Normal University | And 6 more authors.
Electrochimica Acta | Year: 2016

A porous graphene layers with a three-dimensional structure (3DG) was prepared via a gas foaming method based on a polymeric predecessor. This intimately interconnected 3DG structure not only significantly increases the specific surface area but also provides more channels to facilitate electron transport. In addition, 3D N-doped (3DNG) layers materials were synthesized using melamine as a nitrogen source. The nitrogen content in the 3DNG layers significantly influenced the electrochemical performance. The sample denoted as 3DNG-2 exhibited a specific capacitance of 335.2 F g-1 at a current density of 1 A g-1 in a three-electrode system. Additionally, 3DNG-2 exhibited excellent electrochemical performance in aqueous and organic electrolytes using a two-electrode symmetric cell. An energy density of 58.1 Wh kg-1 at a power density of 2500 W kg-1 was achieved, which is approximately 3 times that (19.6 Wh kg-1) in an aqueous electrolyte in a two-electrode system. After 1000 cycles, the capacity retention in aqueous electrolyte was more than 99.0%, and this retention in organic electrolytes was more than 89.4%, which demonstrated its excellent cycle stability. This performance makes 3DNG-2 a promising candidate as an electrode material in high-power and high-energy supercapacitor applications. © 2016 Elsevier Ltd. All rights reserved. Source


Yang K.,South China Normal University | Peng L.,South China Normal University | Shu D.,South China Normal University | Shu D.,Educ And Res On Ener Storage And Pwr Battery Of Guangdong Higher Educ Institutes | And 3 more authors.
Journal of Power Sources | Year: 2013

A heteroatom-enriched activated carbon with low surface area is prepared from poly(ethyleneterephthalate) and is used as an active electrode material for supercapacitor in 1.28 g cm-3 H2SO4 solution. Thus prepared heteroatom-enriched activated carbon is characterized by nitrogen adsorption/desorption at 77 K, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The electrochemical characterizations are performed by cyclic voltammetry and galvanostatic charge/discharge in a three-electrode system. The prepared heteroatom-enriched activated carbon shows an interesting electrochemical activation phenomenon because of which the specific capacitance is significantly increased by charge at high potentials. The activation process involves the insertion of ions into the narrow enclosed free space inside the carbon material to generate new pores. The final results show that the heteroatom-enriched activated carbon electrode has a better discharge rate capability than the commercial activated carbon (Norit AZO) over a wide range of loading current (1-20 A g-1). The highest specific capacitance (201 F g-1) is obtained at 5 mV s-1, which is two fold greater than the one before electrochemical activation. In addition, the specific capacitance of the heteroatom-enriched activated carbon is retained approximately 92% of the initial value after 20,000 cycles, indicating its excellent cycle stability. © 2013 Elsevier B.V. All rights reserved. Source


Zou X.,South China Normal University | Kang Z.,South China Normal University | Shu D.,South China Normal University | Shu D.,Educ And Res On Ener Storage And Pwr Battery Of Guangdong Higher Educ Institutes | And 6 more authors.
Electrochimica Acta | Year: 2015

In this study, carbon additives such as activated carbon (AC) and carbon black (CB) are introduced to the negative electrode to improve its electrochemical performance, the negative electrode sheets are prepared by simulating the negative plate manufacturing process of lead-acid battery, the types and contents of carbon additives in the negative electrode sheets are investigated in detail for the application of lead-carbon battery. The electrochemical performance of negative electrode sheets are measured by chronopotentiometry, galvanostatic charge-discharge and electrochemical impedance spectroscopy, the crystal structure and morphology are characterized by X-ray diffraction and scanning electron microscopy, respectively. The experimental results indicate that the appropriate addition of AC or CB can enhance the discharge capacity and prolong the cycle life of negative electrode sheets under high-rate partial-state-of-charge conditions, AC additive exerts more obvious effect than CB additive, the optimum contents for the best electrochemical performance of the negative electrode sheets are determined as 0.5wt% for both AC and CB. The reaction mechanism of the electrochemical process is also discussed in this paper, the appropriate addition of AC or CB in negative electrode can promote the conversion of PbSO4 to Pb, suppress the sulfation of negative electrode sheets and reduce the electrochemical reaction resistance. © 2014 Elsevier Ltd. All rights reserved. Source

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