Fig. 2: Kinetic studies for mechanistic role of K+ in CO2RR.
From: Identification of K+-determined reaction pathway for facilitated kinetics of CO2 electroreduction
a LSVs of Ni-N4-HM in 0.5 M KHCO3 solution. Red curve: With CO2 introduced. Blue curve: With Ar introduced. Gray curve: Experimental partial current density for HER derived from the red curve (CO2 introduced). b LSVs of Ni-N4-HM in different solutions, but with the same pH value of 3. c Kinetic isotope effect (KIE) determined from comparing electrolytes prepared with D2O vs H2O. d Tafel slopes for different solutions. Note that the purple curve represents the Tafel slope of total current density. The variation of K+ concentration is modulated with the introduction of KCl. The voltage in this figure is not iR corrected.
