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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：虎门体育app下载官网大学城校区 B4-215报告厅

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环境与能源虎门体育app下载官网

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.