Cooperative Fe sites on transition metal (oxy)hydroxides drive high oxygen evolution activity in base

Abstract Fe-containing transition-metal (oxy)hydroxides are highly active oxygen-evolution reaction (OER) electrocatalysts in alkaline media and ubiquitously form across many materials systems. The complexity and dynamics of the Fe sites within the (oxy)hydroxide have slowed understanding of how and where the Fe-based active sites form—information critical for designing catalysts and electrolytes with higher activity and stability. We show that where/how Fe species in the electrolyte incorporate into host Ni or Co (oxy)hydroxides depends on the electrochemical history and structural properties of the host material. Substantially less Fe is incorporated from Fe-spiked electrolyte into Ni (oxy)hydroxide at…

• NS
  National Science Foundation

  Awards: CHE-1955106, 2117614, 1955106
• NA
  Nancy and Stephen Grand Technion Energy Program
• EC
  European Commission

  Award: 804092
• DF
  Deutsche Forschungsgemeinschaft

  Awards: 390540038, 2008-390540038-UniSysCat, EXC 2008-390540038-UniSysCat, EXC 2008-390540038, EXC 2008
• BF
  Bundesministerium für Bildung und Forschung

  Award: 05K19KE1
• HB
  Helmholtz-Zentrum Berlin für Materialien und Energie