报告主题:On sinterability and conductivity of sintered BZCY electrolytes
报告嘉宾:李箭(教授,华中科技大学)
时 间:2023年7月9日(周日)下午14:40
地 点:材料学院守璞楼536会议厅
报告人简介
李箭,博士,华中科技大学二级教授,武汉华科福赛新能源有限责任公司联合创始人、首席科学家;中国材料研究学会理事,中国可再生能源学会燃料电池专业委员会副主任,燃料电池标准委员会委员。美国University of Illinois at Urbana-Champaign陶瓷工程博士,北京钢铁研究总院金属材料博士;上海交通大学材料科学学士、硕士;曾任美国FuelCell Energy公司高级材料工程师和加拿大Global Thermoelectric公司高级科学家。回国后加入华中科技大学组建了燃料电池研究中心,从事固体氧化物燃料电池技术的研究与开发。开发了国内第一台固体氧化物燃料电池独立发电系统和第一台5kW SOFC独立发电系统。回国至今,李箭教授及团队已承担了国家“863”计划(5项)、“973”计划(1项)、国家自然科学基金(14项,含2项重点项目)、湖北省自然科学重大项目(2项)、武汉市科技攻关及重大横向课题共60多项科研项目,研究经费合计超过7000万元;带领团队获得湖北省“创新团队”称号。已在相关期刊发表论文300多篇,撰写固体氧化物燃料电池专著2部,获得6项美国发明专利和15项中国发明专利。
报告内容简介
BaZr0.1Ce0.7Y0.2O3 (BZCY) is a promising PCFC electrolyte material as it has balanced protonic conductivity and stability in reduced and CO2-containing atmospheres. However, the required high sintering temperatures (>1500℃) for densifying BZCY electrolytes increase energy consumption and limit their practical applications. NiO is the most interesting sintering aid reduce the sintering temperature of BZCY. Two BZCY by solid-state reaction (sr) and sol-gel (sg) methods and three NiO (commercial large (L)-, small (S)-particle, and infiltration prepared (I) NiO) are mixed, respectively, and sintered at 1500 °C in air for 6 h, i.e., sr-L, sr-S, sr-I, sg-L, sg-S, and sg-I, to study the effect of particle sizes of BZCY powder and NiO sintering aid on the sinterability and conductivity of electrolytes for protonic ceramic fuel cells. The results indicate that density and grain size affect the conductivity critically; the average grain size and conductivity follow orders of sr-L (8.16 μm) ≈ sg-L (8.53 μm) < sr-S (10.59 μm) ≈ sg-I (10.65 μm) < sg-S (14.07 μm) < sg-I (26.08 μm) and sr-L < sg-L < sr-S < sg-S ≈ sr-I < sg-I. sg-I has the highest sintered density and biggest grains, so that highest conductivity (0.039 S cm-1 at 800 °C in 5 vol.% H2-N2).
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材料学院
2023年7月8日