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Bifunctional air electrode type used perovskite oxide catalytic materials research

Author: WenMeiSheng
Tutor: ZhouDeZuo
School: Central South University
Course: Applied Chemistry
Keywords: Perovskite Sol - Microwave Oxygen Reduction Oxide precipitate Adsorption
CLC: O643.36
Type: Master's thesis
Year: 2011
Downloads: 57
Quote: 0
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Abstract


A perovskite type oxide fuel cell air electrode used in high-performance non- noble metal catalyst , the catalytic effect is closely related to their structure . This work studied the sol - gel method perovskite oxide La0.5Sr0.5 (LSCoO), for the first time using a sol - Microwave synthesis of carbon materials doped perovskite oxide La0.5Ca0. 5CoO3 / C (LSCoO / C), and test them in an alkaline medium (6mol · L-1KOH) the electrochemical performance. Sol - gel method perovskite oxide LSCoO, the particles are irregular cube, there is a slight reunion, particle size between 50-60nm . This product is a catalyst electrode in alkaline medium under air atmosphere (6mol · L-1KOH) , the potential of -0.2 V (vs. HgO / Hg) , the catalytic oxygen reduction current density of 152 mA · cm- 2, the potential is 0.7 V (vs. HgO / Hg) , the catalytic current density of oxygen precipitates 152 mA · cm-2. Sol - microwave synthesized LSCoO / C, the particles were spherical shape and particle size of 15 ~ 25 nm and evenly distributed between . The electrode thus prepared catalyst in an air atmosphere alkaline medium (6mol · L-1KOH) , the potential of -0.2 V (vs. HgO / Hg) , the catalytic oxygen reduction current density of 157 mA · cm-2, potential of 0.7 V (vs. HgO / Hg) , the catalytic current density of oxygen precipitation 142mA · cm-2. LSCoO, LSCoO / C catalytic oxygen reduction performance and oxygen precipitates are excellent , and are better than 5% wt Pt / C catalyst , oxygen electrode can be used as bifunctional catalytic material . The catalyst LSCoO, LSCoO / C air electrode as prepared by the battery cathode , assembled into small zinc - air batteries , a preliminary study of the battery charge and discharge performance. Establishment of O2 in the perovskite -type oxide CaTiO3 (001) surface adsorption model , in order to study the O2 adsorption mechanism on its surface , and the surface oxygen defects confirmed favor adsorption of O2 .

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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