120th General Meeting of the KCS

Type Poster Presentation
Area Material Chemistry
Room No. Exhibition Hall 2+3
Time 10월 19일 (목요일) 11:00~12:30
Code MAT.P-417
Subject Organic molecule-intercalated MoS2 nanosheets for highly active hydrogen evolution reaction
Authors Kwon Ik Seon, InHye Kwak, Yeron Lee1, Ga Bin Jung, jeunghee park2,*
Micro Device Engineering / Microdevices, Korea University, Korea
1Micro Device Engineering / Department of Microdevi, Korea University, Korea
2Department of Materials Chemistry, Korea University, Korea
Abstract Hydrogen generated from water splitting has great potential for use as a clean, recyclable, and relatively low-cost energy source. Currently, Pt is state-of-art catalyst as only small overpotentials are required for high reaction rates. However, the scarcity and high cost of Pt limit its widespread technological use. This limitation has motivated significant efforts toward replacing Pt with earth-abundant non-noble metal materials. Transition metal carbides are one type of attractive materials, which exhibit good stability in acidic and basic media compared to their pure metal counterparts. Motivated by the novel properties of two-dimensional materials, MoS2 has been extensively explored with discoveries surging in the recent years. Such impressive progress benefits from the success in synthesizing nanostructured MoS2 in large scale. Herein, we report one-step hydrothermal synthesis of MoS2 nanosheets using dimethyl-p-phenylenediamine (DMPD) as guest molecule. The MoS2 nanosheets possess remarkably expanded interlayer spacing (1.0-1.3 nm), and the controlled phase (semiconducting 2H and metallic 1T) by the intercalation of DMPD. As the concentration of DMPD and/or the sulfur vacancies increases, they prefer to have the 1T phase with excellent catalytic performance for hydrogen evolution reaction. First-principle calculation predicted that the 1T phase MoS2 becomes favorable by increasing the S vacancies and DMPD. The present work challenges the control of the electronic structures of MoS2 nanosheets by intercalating the electron donating molecules.
E-mail bbuli12@korea.ac.kr