Ultraefficient Electrocatalytic Hydrogen Evolution from Strain-Engineered, Multilayer MoS<sub>2</sub>.
basic_science · Level V
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- Record sourced from PubMed, PMID 35666985.
- Also identified by DOI 10.1021/acs.nanolett.2c00938.
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Abstract
This paper reports an approach to repurpose low-cost, bulk multilayer MoS<sub>2</sub> for development of ultraefficient hydrogen evolution reaction (HER) catalysts over large areas (>cm<sup>2</sup>). We create working electrodes for use in HER by dry transfer of MoS<sub>2</sub> 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 MoS<sub>2</sub> 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 MoS<sub>2</sub> 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 MoS<sub>2</sub> was promoted by the phase transition; the combined effect of desulfurization and the lower charge resistance induced superior HER performance.