报告题目：用于能源和催化应用的无机纳米材料的设计合成和组装

报告人：Taeghwan Hyeon（韩国首尔国立大学，特聘教授）

报告时间：2024年6月18日（星期二）下午16：00

报告地点：华南理工大学大学城校区 B4-215报告厅

欢迎广大师生参加。

环境与能源学院

2024年6月13日

报告人简介

Taeghwan Hyeon，韩国首尔国立大学（SNU）杰出教授和基础科学研究所（IBS）纳米粒子研究中心主任。他因在均匀纳米颗粒的宏量合成方面的杰出贡献，以及在无机纳米粒子的设计合成及其在生物医学、能源和软电子设备应用的开创性研究，而受到广泛认可。他在2011年被列入世界前100名化学家，在2014年至2023年期间被高度引用科学家（化学和材料科学工程），并被选为2020年化学引文桂冠。他获得了四个重要的韩国科技奖项，包括2022年韩国国家工程院大奖，2016年韩国总统最佳科学家奖。2012年三星Hoam奖，2008年浦项制铁T.J.Park奖。他还在国际真空大会上获得了2016年IUVSTA奖，并发表了Kavli基金会材料研究前沿演讲。他是韩国科学技术院、韩国国家工程院、美国国家工程院、瑞典皇家工程院的当选院士/成员科学、皇家化学学会和材料研究学会会士。 2010年至2020年，他担任J.Am.Chem.Soc.的副主编。

报告摘要：

Recently we have focused on the architecture engineering of inorganic nanomaterials for their applications to electrocatalysis and photocatalysis. We present a synthesis of highly durable and active fuel cell electrocatalysts based on ordered M-Pt alloy nanoparticles for oxygen reduction reaction (ORR) in PEMFC.We synthesized multigrain nanocrystals consisting of Co₃O₄ nanocube cores and Mn₃O₄ shells with disclination defects,facet-defined and strain-free Co-Mn spinel oxide nanoparticles, and uniform-sized multi-metal spinel oxide nanoparticles composed of Mn, Co, and Fe. Using these multimetallic oxide nanomaterials, we studied the composition−structure−activity relationships in electrocatalytic ORR processes. We synthesized highly active and stable electrocatalysts for hydrogen peroxide (H₂O₂) production including Co-N₄(O) moiety incorporated in nitrogen-doped graphene (Co₁-NG(O)) and cobalt phthalocyanine (CoPc) immobilized on oxidized carbon nanotube substrate.

The electrocatalytic oxygen evolution reaction (OER) plays a pivotal role in the mass production of hydrogen fuel and chemical feedstocks by various electrochemical reactions. We report that early transition metals with vacant d orbitals (d⁰-oxoanions) directly participate in and accelerate the alkaline OER via a redox cycle associated with early transition metal–peroxo species. We report that doping aluminum (Al) into RuO₂ (Ir-free) and RuIrO_x (low-Ir) leads to outstanding activity and excellent durability for OER at a high current density. We demonstrate that active machine-learning on even small datasets – but supplemented by informative structural-characterization data and coupled with close-loop experimentation – can discover a “champion” four-metal perovskite oxide OER catalyst. 

We report on the design and synthesis of highly active TiO₂ photocatalysts incorporated with site-specific single copper atoms (Cu/TiO₂) that exhibit reversible and cooperative photoactivation process, and enhancement of photocatalytic hydrogen generation and CO₂ photoreduction activity. We presented a floatable photocatalytic platform constructed from elastomer-hydrogel nanocomposites, demonstrating its superiority over conventional systems in solar hydrogen production. We demonstrated a general method for synthesizing atomically dispersed catalysts (ADCs) via photochemical defect tuning for controlling oxygen vacancy dynamics. The optimized Pt-DSA/TiO₂ shows unprecedentedly high photocatalytic hydrogen evolution activity.