Molybdenum Disulfide-Black Phosphorus Hybrid Nanosheets as a Superior Catalyst for Electrochemical Hydrogen Evolution.
basic_science · Level V
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- Record sourced from PubMed, PMID 28605201.
- Also identified by DOI 10.1021/acs.nanolett.7b01334.
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Abstract
Engineering electronic properties is a promising way to design nonprecious-metal or earth-abundant catalysts toward hydrogen evolution reaction (HER). Herein, we deposited catalytically active MoS<sub>2</sub> flakes onto black phosphorus (BP) nanosheets to construct the MoS<sub>2</sub>-BP interfaces. In this case, electrons flew from BP to MoS<sub>2</sub> in MoS<sub>2</sub>-BP nanosheets because of the higher Fermi level of BP than that of MoS<sub>2</sub>. MoS<sub>2</sub>-BP nanosheets exhibited remarkable HER performance with an overpotential of 85 mV at 10 mA cm<sup>-2</sup>. Due to the electron donation from BP to MoS<sub>2</sub>, the exchange current density of MoS<sub>2</sub>-BP reached 0.66 mA cm<sup>-2</sup>, which was 22 times higher than that of MoS<sub>2</sub>. In addition, both the consecutive cyclic voltammetry and potentiostatic tests revealed the outstanding electrocatalytic stability of MoS<sub>2</sub>-BP nanosheets. Our finding not only provides a superior HER catalyst, but also presents a straightforward strategy to design hybrid electrocatalysts.