Fig. 5: Investigation of the temperature-dependent reaction mechanism.
From: Locking interstitial hydrogen atoms in Pd metallenes for efficient oxygen reduction reaction
ORR polarization curves of a PdMnHx/C and b PdHx/C measured from 273 to 353 K in 0.1 M KOH electrolyte saturated with O2 at rotation speed of 1600 rpm and scan rate of 10 mV s−1. c Mass activities of PdMnHx/C and PdHx/C determined at 0.95 V in anodic scan as a function of temperature. Temperature-dependent electrochemical XRD patterns of d PdMnHx/C and e PdHx/C from 303 K to 353 K. f Temperature-dependent lattice parameter of PdMnHx/C and PdHx/C. The solution resistance (Rs = 40 ± 5 Ω) was obtained from EIS measurements. g Schematic illustration of the operando DEMS measurement. The DEMS measurements were conducted using an Ag/AgCl reference electrode (RE), a carbon rod as the counter electrode (CE), and a gold film coated with the catalyst as the working electrode (WE). DEMS signals of H2, HD, and D2 products for h PdMnHx/C and (i) PdHx/C. The labels “off” and “on” in Figs. 5h, i denote cut-off of the first scan and re-start of the second scan during the ORR test program, respectively. Source data are provided as a Source Data file.
