title: A comprehensive study on atomic layer deposition of molybdenum sulfide for electrochemical hydrogen evolution.
abstract: Atomic layer deposition (ALD) has emerged as an efficient method to design and prepare catalysts with atomic precision. Here, we report a comprehensive study on ALD of molybdenum sulfide (MoSx) for an electrocatalytic hydrogen evolution reaction. By using molybdenum hexacarbonyl and dimethyldisulfide as the precursors of Mo and S, respectively, the MoSx catalysts are grown at 100 °C on porous carbon fiber papers (CFPs). The ALD process results in the growth of particle-like MoSx on the CFP due to the lack of adsorption sites, and its crystallographic structure is a mixture of amorphous and nano-crystalline phases. In order to unveil the intrinsic activity of the ALD-MoSx, the exchange current densities, Tafel slopes, and turnover frequencies of the catalysts grown under various ALD conditions have been investigated by considering the fractional surface coverage of MoSx on the CFP and catalytically-active surface area. In addition, the ALD-MoSx/CFP catalysts exhibit excellent catalytic stability due to the strong adhesion of MoSx on the CFP and the mixed phase.
authors.affiliation: Department of Chemical Engineering, Konkuk University, 120 Neungdong-Ro, Gwangjin-Gu, Seoul 143-701, Korea. ysmin@konkuk.ac.kr and Electronic Materials Center, Korea Institute of Science and Technology, Seongbuk-Gu, Seoul 136-791, Korea. wsleemk@gmail.com.
authors.forename: Do Hyun
authors.initials: DH
authors.lastname: Kwon
authors.affiliation: Department of Chemical Engineering, Konkuk University, 120 Neungdong-Ro, Gwangjin-Gu, Seoul 143-701, Korea. ysmin@konkuk.ac.kr.
authors.forename: Zhenyu
authors.initials: Z
authors.lastname: Jin
authors.affiliation: Department of Chemical Engineering, Konkuk University, 120 Neungdong-Ro, Gwangjin-Gu, Seoul 143-701, Korea. ysmin@konkuk.ac.kr.
authors.forename: Seokhee
authors.initials: S
authors.lastname: Shin
authors.affiliation: Electronic Materials Center, Korea Institute of Science and Technology, Seongbuk-Gu, Seoul 136-791, Korea. wsleemk@gmail.com.
authors.forename: Wook-Seong
authors.initials: WS
authors.lastname: Lee
authors.affiliation: Department of Chemical Engineering, Konkuk University, 120 Neungdong-Ro, Gwangjin-Gu, Seoul 143-701, Korea. ysmin@konkuk.ac.kr.
authors.forename: Yo-Sep
authors.initials: YS
authors.lastname: Min