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Rational strain engineering of single-atom ruthenium on nanoporous MoS₂ for highly efficient hydrogen evolution.

ABSTRACT: Maximizing the catalytic activity of single-atom catalysts is vital for the application of single-atom catalysts in industrial water-alkali electrolyzers, yet the modulation of the catalytic properties of single-atom catalysts remains challenging. Here, we construct strain-tunable sulphur vacancies around single-atom Ru sites for accelerating the alkaline hydrogen evolution reaction of single-atom Ru sites based on a nanoporous MoS₂-based Ru single-atom catalyst. By altering the strain of this system, the synergistic effect between sulphur vacancies and Ru sites is amplified, thus changing the catalytic behavior of active sites, namely, the increased reactant density in strained sulphur vacancies and the accelerated hydrogen evolution reaction process on Ru sites. The resulting catalyst delivers an overpotential of 30 mV at a current density of 10 mA cm^-2, a Tafel slope of 31 mV dec^-1, and a long catalytic lifetime. This work provides an effective strategy to improve the activities of single-atom modified transition metal dichalcogenides catalysts by precise strain engineering.

SUBMITTER: Jiang K

PROVIDER: S-EPMC7966786 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature

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Rational strain engineering of single-atom ruthenium on nanoporous MoS<sub>2</sub> for highly efficient hydrogen evolution.

Jiang Kang K Luo Min M Liu Zhixiao Z Peng Ming M Chen Dechao D Lu Ying-Rui YR Chan Ting-Shan TS de Groot Frank M F FMF Tan Yongwen Y

Nature communications 20210316 1

Maximizing the catalytic activity of single-atom catalysts is vital for the application of single-atom catalysts in industrial water-alkali electrolyzers, yet the modulation of the catalytic properties of single-atom catalysts remains challenging. Here, we construct strain-tunable sulphur vacancies around single-atom Ru sites for accelerating the alkaline hydrogen evolution reaction of single-atom Ru sites based on a nanoporous MoS<sub>2</sub>-based Ru single-atom catalyst. By altering the strai ...[more]

PMID: 33727537

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Project description:The design and fabrication of inexpensive highly efficient electrocatalysts for the production of hydrogen via the hydrogen evolution reaction (HER) underpin a plethora of emerging clean energy technologies. Herein, we report the fabrication of highly efficient electrocatalysts for the HER based on magnetron-sputtered MoS2 onto a nanocarbon support, termed MoS2/C. Magnetron sputtering time is explored as a function of its physiochemical composition and HER performance; increased sputtering times give rise to materials with differing compositions, i.e., Mo4+ to Mo6+ and associated S anions (sulfide, elemental, and sulfate), and improved HER outputs. An optimized sputtering time of 45 min was used to fabricate the MoS2/C material. This gave rise to an optimal HER performance with regard to its HER onset potential, achievable current, and Tafel value, which were -0.44 (vs saturated calomel electrode (SCE)), -1.45 mV s-1, and 43 mV dec-1, respectively, which has the highest composition of Mo4+ and sulfide (MoS2). Electrochemical testing toward the HER via drop casting MoS2/C upon screen-printed electrodes (SPEs) to electrically wire the nanomaterial is found to be mass coverage dependent, where the current density increases up to a critical mass (ca. 50 μg cm-2), after which a plateau is observed. To allow for a translation of the bespoke fabricated MoS2/C from laboratory to new industrial applications, MoS2/C was incorporated into the bulk ink utilized in the fabrication of SPEs (denoted as MoS2/C-SPE), thus allowing for improved electrical wiring to the MoS2/C and resulting in the production of scalable and reproducible electrocatalytic platforms. The MoS2/C-SPEs displayed far greater HER catalysis with a 450 mV reduction in the HER onset potential and a 1.70 mA cm-2 increase in the achievable current density (recorded at -0.75 V (vs SCE)), compared to a bare/unmodified graphitic SPE. The approach of using magnetron sputtering to modify carbon with MoS2 facilitates the production of mass-producible, stable, and effective electrode materials for possible use in electrolyzers, which are cost competitive to Pt and mitigate the need to use time-consuming and low-yield exfoliation techniques typically used to fabricate pristine MoS2.

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Rational strain engineering of single-atom ruthenium on nanoporous MoS₂ for highly efficient hydrogen evolution.

Publications

Rational strain engineering of single-atom ruthenium on nanoporous MoS<sub>2</sub> for highly efficient hydrogen evolution.

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Rational strain engineering of single-atom ruthenium on nanoporous MoS2 for highly efficient hydrogen evolution.

Publications

Rational strain engineering of single-atom ruthenium on nanoporous MoS<sub>2</sub> for highly efficient hydrogen evolution.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

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Rational strain engineering of single-atom ruthenium on nanoporous MoS₂ for highly efficient hydrogen evolution.