Integration of Alloy Segregation and Surface CoO Hybridization in Carbon‐Encapsulated CoNiPt Alloy Catalyst for Superior Alkaline Hydrogen Evolution

Abstract Constructing an efficient alkaline hydrogen evolution reaction (HER) catalyst with low platinum (Pt) consumption is crucial for the cost reduction of energy devices, such as electrolyzers. Herein, nanoflower‐like carbon‐encapsulated CoNiPt alloy catalysts with composition segregation are designed by pyrolyzing morphology‐controlled and Pt‐proportion‐tuned metal–organic frameworks (MOFs). The optimized catalyst containing 15% CoNiPt NFs (15%: Pt mass percentage, NFs: nanoflowers) exhibits outstanding alkaline HER performance with a low overpotential of 25 mV at a current density of 10 mA cm −2 , far outperforming those of commercial Pt/C (47 mV) and the most advanced catalysts. Such superior activity…

• CU
  City University of Hong Kong

  Awards: 7005620, 7020040, 9380117
• NN
  National Natural Science Foundation of China

  Award: 22250410269
• CP
  China Postdoctoral Science Foundation

  Award: 11110032542301
• SK
  State Key Laboratory of Supramolecular Structure and Materials

  Award: sklssm2023034
• NS
  National Synchrotron Radiation Laboratory