Defined organic-octamolybdate crystalline superstructures derived Mo2C@C as efficient hydrogen evolution electrocatalysts
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Hydrogen evolution electrocatalysts derived from metal-organic crystalline frameworks can inherit the merits of ordered and adjustable structures with high surface area.In this paper,organic-octamolybdate crystalline superstructures(OOCS)with a fixed stoichiometric ratio of Mo8(L)2 and high Mo content(＞40 wt％)were synthesized using flexible ligands with controllable lengths(named as OOCS-1-3).Then,molybdenum carbides coated with carbon layers as electrocatalysts(Mo2C@C-1-3)can be obtained di-rectly from a one-step high-temperature carbonization process using OOCS-1-3 as precursors.As a typical example,Mo2C@C-3 exhibits satisfactory hydrogen evolution activity with a low overpotential of 151 mV(1.0mol/L KOH)at 10mA/cm2 and stability for 24h.The electrocatalytic activity is mainly from the syn-ergistic interactions between the carbon layers and molybdenum carbide species.Furthermore,compared with the initial content of C,N,Mo in OOCS and Mo2C@C,the catalytic activity increases with the N amount.This work makes organic-octamolybdate crystalline superstructures used as general precursors to product high Mo content electrocatalysts applied in energy storage and conversion fields.
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