Journal of the American Chemical Society· 2013Q1
Enhanced Hydrogen Evolution Catalysis from Chemically Exfoliated Metallic MoS<sub>2</sub> Nanosheets
- 3,304citations
- Q1SCImago
- 2013year
Short summary
Metallic 1T-MoS<sub>2</sub> nanosheets, produced by chemically exfoliating semiconducting 2H-MoS<sub>2</sub>, achieve a 10 mA/cm<sup>2</sup> electrocatalytic current density at a low overpotential of -187 mV and a Tafel slope of 43 mV/decade for hydrogen evolution.
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Key points
- Metallic 1T-MoS<sub>2</sub> nanosheets were produced by lithium intercalation exfoliation of semiconducting 2H-MoS<sub>2</sub> grown on graphite.
- The 1T-MoS<sub>2</sub> nanosheets exhibit a current density of 10 mA/cm<sup>2</sup> at -187 mV overpotential for HER.
- The catalyst achieved a Tafel slope of 43 mV/decade, indicating facile electrode kinetics.
- Enhanced performance is attributed to low-loss electrical transport and a proliferated density of catalytic active sites.
AI-generated from the title and abstract; the full text is not read.
Abstract
Promising catalytic activity from molybdenum disulfide (MoS2) in the hydrogen evolution reaction (HER) is attributed to active sites located along the edges of its two-dimensional layered crystal structure, but its performance is currently limited by the density and reactivity of active sites, poor electrical transport, and inefficient electrical contact to the catalyst. Here we report dramatically enhanced HER catalysis (an electrocatalytic current density of 10 mA/cm(2) at a low overpotential of -187 mV vs RHE and a Tafel slope of 43 mV/decade) from metallic nanosheets of 1T-MoS2 chemically exfoliated via lithium intercalation from semiconducting 2H-MoS2 nanostructures grown directly on graphite. Structural characterization and electrochemical studies confirmed that the nanosheets of the metallic MoS2 polymorph exhibit facile electrode kinetics and low-loss electrical transport and possess a proliferated density of catalytic active sites. These distinct and previously unexploited features of 1T-MoS2 make these metallic nanosheets a highly competitive earth-abundant HER catalyst.
The authors' abstract, as published at the source. Journal of the American Chemical Society, 2013 · DOI ↗
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Field: Renewable Energy, Sustainability and the Environment
Renewable Energy, Sustainability and the EnvironmentEnergy