Monolayer MoS₂ quantum dots as catalysts for efficient hydrogen evolution
2015
Qiao, Wen | Yan, Shiming | Song, Xueyin | Zhang, Xing | Sun, Yuan | Chen, Xing | Zhong, Wei | Du, Youwei
Monolayer MoS₂ quantum dots (QDs) with lateral size around 3 nm were prepared through an effective multi-exfoliation based on lithium (Li) intercalation. The effects of the number of exfoliation on the microstructures and electrocatalytic activities of hydrogen evolution reaction (HER) for MoS₂ nanosheets were examined. The lateral size of the nanosheets decreases rapidly with increasing the number of exfoliation. The obtained monolayer MoS₂ QDs exhibit improved HER catalytic activities with a low overpotential of approximately 120 mV and a relatively small Tafel slope of 69 mV dec⁻¹. Both the ultrathin structure and the abundance of exposed active edge sites make monolayer MoS₂ QDs a promising HER electrocatalyst for practical application.
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