Decomposition of Halogenated Molybdenum Sulfide Dianions [MoSX] (X = Cl, Br, I).

Molybdenum sulfides are considered a promising and inexpensive alternative to platinum as a catalyst for the hydrogen evolution reaction. In this study, we perform collision-induced dissociation experiments in the gas phase with the halogenated molybdenum sulfides [MoSCl], [MoSBr], and [MoSI]. We show that the first fragmentation step for all three dianions is charge separation via loss of a halide ion.

Rearrangement and decomposition pathways of bare and hydrogenated molybdenum oxysulfides in the gas phase.

Molybdenum sulfides and molybdenum oxysulfides are considered a promising and cheap alternative to platinum as a catalyst for the hydrogen evolution reaction (HER). To better understand possible rearrangements during catalyst activation, we perform collision induced dissociation experiments in the gas phase with eight different molybdenum oxysulfides, namely [MoOS], [MoOS], [MoOS], [MoOS], [MoOS], [HMoOS], [HMoOS] and [HMoOS], on a Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometer. We identify fragmentation channels of the molybdenum oxysulfides and their interconnections.