Guest Speaker: Prof. HE Qiyuan
Department of Materials Science & Engineering
The City University of Hong Kong
Prof. Qiyuan He is currently an Associate Professor in the Department of Materials Science & Engineering at the City University of Hong Kong. He obtained his PhD Degree from Nanyang Technological University in Singapore and did his postdoc work in University of California, Los Angeles. Prof. He's research scope focuses on the fundamentals of semiconductor interfaces and their applications in nanoelectronics, iontronics, catalysis and on-chip electrochemistry. He has published over 100 research papers in highly esteemed journals such as Nature, Nature Chemistry, Nature Materials, Nature electronics, Advanced Materials, Nano Letters, and ACS Nano. He has over 25,000 citations with an H-index of 59 (SCOPUS). He has also been listed as World's Top 2% Scientists by Stanford University and a Highly Cited Researcher (cross-field) by Clarivate.
Abstract
On-chip electrocatalytic microdevice (OCEM) is an emerging platform for investigating microscopic nanocatalysts, offering precise electrochemical measurements and unique perspectives inaccessible in conventional electrochemical methods. Owing to strong adaptability, OCEMs are becoming powerful in measuring the electrocatalytic performance of nanomaterials, identification of active sites, in-situ transport measurement, field-effect modulation of catalysts, and incorporation of in-situ characterization. In this talk, I will give a general introduction to the OCEM platform, review its development, and showcase its capability in developing novel electrocatalysts and explore exotic catalytic mechanism. Recently, by taking advantage of the high space resolution in OCEM measurement, we have interrogated the electrocatalytic mechanism of various transitional metal dichalcogenides at individual nanosheet levels and revealed unique charge transport and transfer mechanism at the solid-electrolyte interface such as enriched active sites, surface reconstruction and quantum tunneling. In conclusion, we showcase our continuous effort in the chemical synthesis of 2D crystals and the adaptability of OCEM methodology in exploring their electrochemical properties.
