研究生学术报告预告登记(开题、中期、答辩)

       为加强研究生学术交流活动,推进学术创新,特开通“研究生学术报告预告区”。我校研究生和教师可以在预告区及时发布和了解有关研究生学术报告的信息,届时参加。也可就某学术报告展开专题讨论与交流。

报告人: 邱潇洁
学号: 1020214030
学院: 环境科学与工程学院
报告类型: 其他学术报告
日期: 7 January 2021
时间: 2:30 PM
地点: 43教公共教室
导师: 赵迎新
题目: Efficiently Electrochemical Reduction of Carbon Dioxide
内容提要:
Nitrogen-doped carbon metal-free materials are widely used in electrochemical reduction of carbon dioxide due to high earth abundance, structural tunability, and excellent catalytic performance. Although specific surface area and nitrogen content are considered as the two most important factors in affecting the electrochemical performance of nitrogen-doped porous carbon catalysts, it does not always mean that the larger they are, the better the catalytic performance is. Tailoring pore structures and maximizing the catalytic effect of a limited number of nitrogen atoms are the keys to the improvement in the electrochemical performance.
Herein, we develop a solvent evaporation induced self-assembly method to synthesize a coal-based nitrogen-doped porous carbon as an efficient metal-free electrocatalyst for CO2 electroreduction. Under the effect of pore shrinkage
induced by high temperatures, nitrogen atoms derived from dicyandiamide are inserted into the carbon matrix of coal, and confined in the micropores produced by KOH activation. The stable nitrogen atoms restricted in the micropores can efficiently convert CO2 into CO due to the spatial confinement effect. The electrocatalyst shows a negligible onset overpotential (–0.16 V) for CO product, a maximum CO Faradaic efficiency of 95 % and a large CO production rate of 36.1 μmol h–1 cm–2 at a low potential of –0.67 V versus the reversible hydrogen electrode (vs. RHE). Moreover, its current density can remain stable after 10 h of potentiostatic electrolysis. This work not only provides a promising earth-abundant electrocatalyst for CO2 electroreduction, but would open up a new avenue for improving the electrochemical performance by coordinating the pore structures and active compoents.
图片:
登记人: 邱潇洁
登记时间: Saturday, 13 March 2021, 7:46 PM