Synthesis of hierarchical MoO₂/MoS₂ nanofibers for electrocatalytic hydrogen evolution

Abstract

Perpendicularly attached MoS₂ nanosheets on MoO₂ conductive nanofibers were synthesized by combining electrospinning, calcination, and sulfurization processes. Compared to randomly stacked MoS₂ nanosheets on MoO₂ nanofiber, they show greater hydrogen evolution reaction (HER) performance (i.e., onset potential of -180 mV versus normal hydrogen electrode with the Tafel slope of 59 mV dec^-1). HER performance decreases with increasing MoS₂ nanocrystal size.