Pt decorated POMOFs-derived constructions for efficient electrocatalytic hydrogen evolution
Molybdenum carbide (Mo2C) has been universally investigated in the field of catalysis due to its d-band electronic structure, which is similar to Pt-group metals. However, the practical application of Mo2C in electrocatalytic hydrogen evolution is limited to its low surface area and inadequate active sites caused by high temperature pyrolysis. Therefore, fabrication of Mo2C-based nanostructures with well-defined morphologies and high porosity remains a great challenge. In this work, we developed an efficient approach to decorate Pt-Cu nanocrystals on Mo2C octahedron (Pt-Cu/Mo2C), which using thermal treatment of polyoxometalates (POMs)-based metal-organic frameworks (NENU-5) followed by galvanic replacement with H2PtCl6. The Pt-Cu/Mo2C nanostructure exhibits an ultrasmall overpotential of 12.9 mV (j=10 mA cm-2) in acidic medium for electrocatalytic hydrogen evolution, which is much lower than bare Mo2C, Pt/Mo2C, and commercial Pt/C catalysts. More importantly, Pt-Cu/Mo2C nanostructure delivers an exceptional cycling stability with negligible decay over 10,000 cycles. The present work demonstrates a potentially guidance for the design of efficient and durable catalysts to boost electrocatalytic hydrogen evolution.