Mo2C Ceramic Electrode Embedded with PtMo3 Nanograins for Hydrogen Evolution Reaction at High Current Density

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Abstract
The scarcity and high price seriously hinder the large-scale industrial application of Pt as the preferred catalyst for the hydrogen evolution reaction (HER). A PtMo3@Mo2C catalytic electrode was designed based on a porous Mo2C ceramic membrane with finger-like holes, where PtMo3 nanograins were uniformly embedded in the surface of the Mo2C grains by electrodeposition and thermal reduction. The loading of Pt is as small as 7.8 × 10-4 g m-2. The electrode exhibits extraordinary HER catalytic performance with an overpotential of 189 mV to drive a current density of 2.0 A cm-2 (acidic) and 212 mV to drive a current density of 1.0 A cm-2 (alkaline). Under ultrahigh current densities, the electrode can operate stably for over 152 h, demonstrating high structural stability and catalytic stability. Theoretical calculations indicate that the formation of Mo2C(100)/PtMo3(200) can further optimize the electronic structure of the interface Pt atoms, thereby enhancing the HER performance.
Funding Information
  • Anhui Provincial Department of Science and Technology (2308085ME139)
  • University Natural Sciences Research Project of Anhui Province (2023AH052203)
  • CAS-CSIRO Collaborative Research Project (E424361)
  • Open Foundation of State Key Laboratory of Advanced Refractory Material (SKLAR202303)

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