Fig. 6: Cation effect measurements for FAD on Pd/C catalyst. | Nature Communications

Fig. 6: Cation effect measurements for FAD on Pd/C catalyst.

From: Disentangling heterogeneous thermocatalytic formic acid dehydrogenation from an electrochemical perspective

Fig. 6

a Cation dependent TOFs for FAD in solutions of different pHs: 0.1 M HClO4 + 1.0 M HCOOH + 0.1 M MClO4 (0.1 M HClO4 + 1.0 M HCOOH for the H+-only solution) for pH 1, 0.2 M HCOOH + 0.2 M MHCOO for pH3.7, 1.0 M MHCOO for pH~7, and 0.1 M MOH + 1.0 M MHCOO for pH13. Temperature condition: 298 K for pH1, 3.7 and ~7, and 333 K for pH13. (M+ stands for cation species). b TOFs for FAD in K+ or NH4+ contained solutions: 0.2 M HCOOH + 0.2 M MHCOO for pH3.7, 1.0 M MHCOO for pH~7. The dotted lines are used for the guide of eyes. c Evans diagrams showing cation effects on FAD in solutions of pH3.7. d Comparisons between measured FAD reaction rates (adapted from data in a) and predicted FAD reaction rates in Evans diagrams (adapted from data in c). e In situ ATR-SEIRA spectra at the Pd/C-solution interface during FAD in solutions containing different cations: 0.2 M HCOOH + 0.2 M HCOO− (colored lines) and 2 M HCOOH (the black line), a.u. stands for absorption unit. The reference spectra were taken before the injection of solutions. Source data are provided as a Source Data file.

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