Coupled Co and Ir nanocrystals on graphite as pH-wide and efficient electrocatalyst for hydrogen evolution

Ir-Doped Co(OH)2 nanosheets as an efficient electrocatalyst for the oxygen evolution reaction

“…28,29 In recent years, numerous researchers have confirmed through experimental measurements and theoretical analysis that doping a small amount of Ir in the transition metal catalyst allows one to optimize the adsorption and binding energies of the reaction intermediates and modulate the d-band electron distribution while increasing the OER active sites, leading to an accelerated charge transfer rate and a reduced overpotential of the catalyst, which can improve the stability of the electrocatalyst. [30][31][32][33] So, Ir doping has been deemed to be a well-established strategy to improve the OER performance of materials since doping of primary materials with small amounts of precious metals Ru or Ir can significantly improve the electrocatalytic performance of the materials. 34,35 Guo et al reported a hollow Ni(OH) 2 nanocage electrocatalyst doped with a minor amount of noble metals (Ir and Ru) constructed as a template with ZIF-8, which shows relatively excellent OER performance in 1 M KOH, while the doping of Ir among them can modify the Ni ions' local electronic structure, activate the local active sites of Ni ions, optimize the binding energy with oxygen-containing intermediates, and subsequently improve the electrochemical performance.…”