應(yīng)材料與化學(xué)學(xué)院梁玉軍教授和公衍生副教授的邀請(qǐng)，墨西哥國(guó)立理工大學(xué)材料與冶金工程系教授J.R. Vargas Garcia來(lái)我校做學(xué)術(shù)報(bào)告。
報(bào)告題目：Carbon nanotube assisted synthesis of CeO2 nanotubes and their electrochemical performance for the oxidation of methanol
報(bào)告時(shí)間：1月11日（本周三）上午10:00
報(bào)告地點(diǎn)：學(xué)海樓109會(huì)議室
報(bào)告摘要：Nano-structured ceria-based materials are increasingly gaining attention for electro-oxidation of methanol due to the capability of ceria to act as a promoter for the preferential oxidation of CO to CO2. Frequently, ceria nanotubes have been fabricated using hard templates such as carbon nanotubes and porous alumina. However, the diameters of these ceria nanotubes are typically in the range of 200 to 1000 nm, too large to have appreciable impact on their catalytic properties. Here, we report the synthesis of ceria nanotubes with diameters ranging from 50 to 160 nm and their electrochemical performance as a support of Pt nanoparticles for electro-oxidation of methanol. Ceria was formed on the surface of functionalized carbon nanotubes by a hydrothermal method obtaining a series of ceria-carbon nanotubes. The carbon template was completely removed by heating in air resulting in the formation of pure single-crystalline ceria nanotubes. The electrochemical performance was evaluated by cyclic voltammetry in 0.5 M H2SO4 and CH3OH solution. Both, ceria-carbon and single-crystalline ceria nanotubes showed higher stability at anodic potentials than commercial carbon-Vulcan materials. The incorporation of Pt resulted in the formation of Ce1-xPtxO2-d solid solution. The Ce1-xPtxO2-d-carbon nanotubes showed higher performance in methanol oxidation than commercial Pt/C-Vulcan or Pt/CeO2 nanoparticles. Thus, the use of ceria nanotubes as a support promotes not only high activity towards methanol oxidation but also stability in the anodic region allowing the direct oxidation of methanol to CO2. The XPS investigations showed that the Ce3+ ion number is about 10% of total cerium ion number, which may be responsible for the high performance of the Ce1-xPtxO2-d-carbon nanotubes.
報(bào)告人簡(jiǎn)介：J.R. Vargas Garcia教授現(xiàn)為墨西哥國(guó)立理工大學(xué)材料與冶金工程系教授、墨西哥國(guó)立理工大學(xué)納米研究中心主任、墨西哥國(guó)家科學(xué)家系統(tǒng)二級(jí)科學(xué)家、墨西哥國(guó)立理工大學(xué)最高級(jí)別教授、墨西哥國(guó)立理工大學(xué)最高級(jí)別學(xué)術(shù)委員、日本東北大學(xué)訪問(wèn)教授。他分別于1986年和1990年獲墨西哥國(guó)立理工大學(xué)冶金工程和材料科學(xué)系學(xué)士及碩士學(xué)位，1995年獲日本東北大學(xué)材料工程系獲博士學(xué)位。J.R. Vargas García教授現(xiàn)為武漢理工大學(xué)講座教授。J.R. Vargas García教授是墨西哥多功能納米材料和功能薄膜材料方面的杰出科學(xué)家，在此領(lǐng)域發(fā)表論文170余篇。
歡迎全校師生參加！
材料與化學(xué)學(xué)院 2017-1-9
