IAMS Lecture Announcement

中研院原分所演講公告

Title: Manipulating atomic layer/liquid electrolyte interfaces for energy conversions

Speaker: Prof. Chun-Wei Chen (Department of Materials Science and Engineering, National Taiwan University)

 　　　　陳俊維特聘教授 (國立臺灣大學材料科學與工程學系暨研究所)

Time: 3:30 PM, December 23 (Thursday), 2021
Place: Dr. Poe Lecture Hall, IAMS (本所浦大邦講堂　臺大校園內)
Contact: Dr. Pei-Ling Luo 羅佩凌 博士

Abstract:

Two-dimensional (2D) atomic-layer materials have exhibited novel physical and chemical properties in the application of energy conversion and storage. For example, 2D transition metal dichalcogenides (TMDs), such as MoS₂, have emerged as a class of promising ultrathin catalysts for HER. They exhibit great potential as an ideal replacement for noble metal electrocatalysts. The adsorption and desorption of electrolyte ions strongly modulate the carrier density or carrier type on the surface of monolayer (ML)-MoS₂ catalyst during hydrogen evolution reaction (HER). The buildup of electrolyte ions onto the surface of ML-MoS₂ during HER may also result in the formation of excitons and trions, similar to those observed in gate-controlled field-effect transistor devices. The distinct carrier relaxation dynamics of excitons and trions of ML-MoS₂ can act as sensitive descriptors to monitor the catalytic activity. By mapping the evolution of the individual constituents of excitons and trions on ML MoS₂ surface during HER, the corresponding spatially-resolved catalytic activity affected by electrolyte gating can be unveiled. This operando probing technique which is used to monitor the interplay between exciton/trion dynamics and electrocatalytic activity for two-dimensional (2D) transition metal dichalcogenides (TMDs) provides an excellent platform to investigate the local carrier behaviors at the atomic layer/liquid electrolyte interfaces during electrocatalytic reaction.

In addition, I would like to address the outstanding performance of 2D/semiconductor photoelectrochemical cells for promising solar-to-fuel conversion, including hydrogen-evolution reaction (HER), oxygen evolution reaction (OER), nitrogen reduction reaction (NRR) and CO₂ reduction. In particular, graphene/Si Schottky junction platform could be an excellent candidate as photoelectrodes operated in harsh electrolyte conditions because graphene exhibits superior corrosion protection properties both in acidic and basic conditions due to its chemical inertness. A similar idea can also be applied to other TMD/semiconductor systems, such as PtSe₂ and MoS₂. Finally, another interesting 2d material system of organic-inorganic hybrid perovskites will be also addressed if I have enough time.

Note:
Attendees should be seated with at least one empty seat between each other and wear a mask at all times.
因應新冠肺炎疫情，本場演講將採間隔座法入座，請全程配戴口罩。

Please tap your ID card for record keeping when entering the lecture hall.
請攜帶臺大識別證或身份證，以便刷卡入場。