BSTRACTWe report the synthesis of a spectrum of highly crystalline molybdenum sulphide/oxide-based materials such as MoS

2

(2-H)

MoO

2

and unique hybrid MoS

2

/MoO

2

nanostructures through chemical vapour deposition (CVD). The as-fabricated samples were scrutinized with materials characterization techniques. Our results reveal that

by tuning growth parameters

different samples demonstrate unique morphologies

which can be unequivocally tied to their chemical composition. We also explore their potential application as electrochemical catalysts

which we found that in addition to using large specific surface area and conductive substrate to improve interlayer conductivity

chemical heterogeneity and efficient charge transport are also essential for good catalytic activity.