Operando Unraveling of the Structural and Chemical Stability of P-Substituted CoSe 2 Electrocatalysts toward Hydrogen and Oxygen Evolution Reactions in Alkaline Electrolyte

The question of whether the metal chalcogenides (phosphides) that have been acknowledged to be efficient materials for bifunctional electrocatalysts really perform as the active species or just “pre-catalysts” has been debated. Herein, a series of operando measurements, including in situ X-ray absorption spectroscopy, liquid-phase transmission electron microscopy, and in situ Raman spectroscopy, were conducted to unravel in real time the structural and chemical stability of P-substituted CoSe2 electrocatalysts under both hydrogen and oxygen evolution reactions (HER and OER, respectively) in an alkaline electrolyte. It can be conclusively revealed that, in an alkaline electrolyte, the P-substituted CoSe2…

• MO
  Ministry of Education
• MO
  Ministry of Science and Technology, Taiwan

  Awards: MOST 107-2628-M-002- 015-RSP, MOST 107-2113-M-003-007-
• NT
  National Taiwan University

  Award: NTU-108L880113