Polyoxometalate Derived Mo Based Hybrid HER Electrocatalysts with Carbon as Matrix and Their Application in Zn-H + Battery

H 2 has been considered as a promising successor for traditional fossil fuels due to its sustainable and clean. In H 2 production, electrocatalytic hydrogen evolution reaction (HER) is the core step. Many noble metal free electrocatalysts for electrochemical H 2 generation have been explored in the past few years. Mo based materials, such as Mo x C (x = 1 or 2), MoP, MoS 2 and Mo x N (x = 1 or 2) have been confirmed as effective electrocatalysts in both acidic and basic conditions with small overpotential, excellent stability and nearly 100% Faradic efficiency in H 2 generation. Because of excellent solubility, controllable dimension and various components, Mo based polyoxometallates (POMs), such as [PMo 12 O 40 ] 3− , [Mo 7 O 24 ] 6− , [P 2 Mo 5 O 23 ] 6− , [Mo 6 O 19 ] 2− and [XMo 6 O 24 ] 4− (X = Co 2+ , Cu 2+ , Ni 2+ ), are ideal precursors to synthesize Mo based electrocatalyst. Here, we summarized Mo based hybrid electrocatalysts in form of Mo x C, MoP, MoS 2 and Mo x N with carbon as matrix, which derived from POM since 2013. In this review, we focus on the synthetic strategy and HER activity of these electrocatalyst. We anticipate this review can provide more insight into the structural and composition regulation of POM precursor to design and synthesis Mo based HER electrocatalyst with more excellent activity.