Abstract
ABSTRACT Molybdenum diselenide (MoSe2) is a potential catalyst for the electrocatalytic hydrogen evolution reaction (HER). However, MoSe2 exhibits a high overpotential in HER due to its low density of active sites, which may limit its practical applicability. Tuning the assisted metal interaction is an effective method for altering the atomic structure and catalytic efficiency of transition metal catalysts. Herein, we report a simple hydrothermal process for synthesising hybrid MoSe2-La2O3 heterostructures for HER. The electrocatalytic HER of nanoflower MoSe2 was improved in the presence of a supported lanthanide-oxide interaction (La2O3), proving that La2O3 materials produce additional activity sites in the MoSe2 materials. The nanocomposite was drop-cast onto screen-printed carbon electrodes (SPCE) and showed reduced overpotential values compared to pristine MoSe2 and La2O3 materials. Across all ratios tested, the MoSe2-La2O3 (M-L2) nanocomposites with a molar ratio of 1:2 exhibit rapid charge transfer during HER performance, with a Tafel slope value of 66 mV/dec and an onsetpotential of 270 mV.
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