Rhuy, Dohyun Lee, Youjin Kim, Ji Yoon Kim, Chansoo Kwon, Yongwoo Preston, Daniel J. Kim, In Soo Odom, Teri W. Kang, Kibum Lee, Dongwook Lee, Won-Kyu 2024-01-12T03:01:47Z 2024-01-12T03:01:47Z 2022-07-06 2022-07 1530-6984 https://pubs.kist.re.kr/handle/201004/76678 This paper reports an approach to repurpose low-cost, bulk multilayer MoS2 for development of ultraefficient hydrogen evolution reaction (HER) catalysts over large areas (>cm(2)). We create working electrodes for use in HER by dry transfer of MoS2 nano- and microflakes to gold thin films deposited on prestrained thermoplastic substrates. By relieving the prestrain at a macroscopic scale, a tunable level of tensile strain is developed in the MoS2 and consequently results in a local phase transition as a result of spontaneously formed surface wrinkles. Using electrochemical impedance spectroscopy, we verified that electrochemical activation of the strained MoS2 lowered the charge transfer resistance within the materials system, achieving HER activity comparable to platinum (Pt). Raman and X-ray photoelectron spectroscopy show that desulfurization in the multilayer MoS2 was promoted by the phase transition; the combined effect of desulfurization and the lower charge resistance induced superior HER performance. English American Chemical Society Ultraefficient Electrocatalytic Hydrogen Evolution from Strain-Engineered, Multilayer MoS2 Article 10.1021/acs.nanolett.2c00938 1 Nano Letters, v.22, no.14, pp.5742 - 5750 Nano Letters 22 14 5742 5750 N scie scopus 000821136600001 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article MONOLAYER MOS2 GRAPHENE CATALYST FILMS TRANSITION MULTISCALE NANOSHEETS OXIDATION MEMBRANES ACTIVE EDGE SITES Water electrolysis Hydrogen evolution reaction Catalytic materials Transition metal chalcogenides Strain engineering Electrochemical processes