关于举行北京化工大学孙晓明教授学术报告的通知 发布者:夏雪峰   发布时间:2023-12-15   浏览次数:425

报告题目:面向氢能应用的表界面工程

报告时间:202312179:30-11:30

报告地点:16号楼214会议室

人:孙晓明教授

工作单位:北京化工大学

报告人简介:

孙晓明2011年获得国家自然科学杰出青年基金,中国可再生能源学会青年工作委员会执行主任、氢能专委会副主任。2005年毕业于清华大学,2008年从美国斯坦福大学结束博士后工作回国,任北京化工大学教授,博导。在国际能源材料与化学主流刊物以通讯作者发表论文200余篇,总引用30000余次;出版专著一本,申请国际专利8项,获授权2项;获国家发明专利授权40余项,7项已经完成转化。被Elsevier、英国皇家化学会、科睿唯安等评为高被引学者。受邀担任Science Bulletin 杂志副主编和Nano Research等国际刊物编委会成员。

 

报告简介:

In this report we want to provide some insightful fundamental understanding of the interfacial variations between electrode and electrolyte during gas evolution reactions and gas consumption reactions. For example, visible bubbles emerge in GERs should have a high nucleation barrier and a rapid barrier-less growth process according to the traditional view, which, however, is contradicted by the experimental observation that a higher overpotential is required for enlarging the NBs to visible ones. We resolve this contradiction by observing the ‘‘pin-rise’’ growth mode of interfacial nanobubbles under electrolysis conditions with the combination of newly developed SPRi technology, atomic force microscopy, and molecular dynamics simulations. On the other hand, water management is crucial for the long-term performance of ion exchange membrane-based fuel cells (FCs), while the lack of flooding pictures at the catalyst layer is seriously challenging for the further optimization of devices. A self-flooding phenomenon was observed at the bubble/electrode interface as the catalyst layer based on our built-up in situ model reaction system during ORR/HOR. The unexpected flooding phenomenon was attributed to the decrease in saturated vapor pressure driven by the generation of ions (H+ for acidic HOR and OH- for alkaline ORR), leading to the condensation of the water vapor at the bubble/electrode interfaces, which offers a novel perspective for water management in FCs. These works shed light on the behaviors at the three-phase boundaries and mechanisms thereof, which should be helpful for further optimization of various gas-involving electrochemical reaction-based devices.