| 报告题目 | Controlled Assembly of Nanoparticles for Electrocatalytic Reactions |
| 报告人 | 孙守恒 教授 |
| 报告人单位 | 布朗大学 |
| 报告时间 | 2016-06-28 |
| 报告地点 | 合肥微尺度物质科学国家实验室一楼科技展厅 |
| 主办单位 | 合肥微尺度物质科学国家实验室、中国科学技术大学化学与材料科学学院 |
| 报告介绍 | 报告摘要：
Recent advance in solution phase synthesis has made it possible to obtain nanoparticles (NPs) with their dimensions controlled at near-atomic precision for catalytic applications. In this talk, I highlight two examples demonstrated in our lab on the synthesis and self-assembly of Co-, and Cu-based NPs for enhanced electrocatalytic reactions.
Monodisperse Co NPs were synthesized via thermal decomposition of cobalt carbonyl and assembled at water-air interface on a glass carbon (GC) plate and their catalysis for oxygen evolution reaction.These Co NPs were further stabilized against oxidation via reductive annealing at 600°C. When employed as the catalyst for electrochemical oxidation reaction in 0.1 M KOH, the monolayer Co NPs show 15 times higher turnover frequency (TOF) (2.13 s-1) and mass activity (1949 A/g) than the same NPs deposited on conventional carbon black at the overpotential of 0.4 V. These Co NPs are a promising new class of noble-metal-free catalyst for water-splitting.
Monodisperse Cu NPs assembled on pyridinic-N rich graphene (p-NG) show much enhanced catalysis for selective electrochemical reduction of CO2 to ethylene (C2H4). At -0.9 V (vs reversible hydrogen electrode), the C2H4 formation Faradaic efficiency and hydrocarbon selectivity reach 19% and 79% respectively. The work demonstrates a new strategy to improve Cu NP catalytic activity and selectivity for electrochemical reduction of CO2 for sustainable chemistry and energy applications.
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