Fig. 4
From: Room-temperature electrochemical water–gas shift reaction for high purity hydrogen production
Activity and stability of the PtCu@CNTs anode catalysts for the EWGS. a The current density of CO oxidation on the Pt/C, Pt@CNTs, and PtCu@CNTs at different potentials. Inset shows that the current density at 0 V versus RHE reaches 0.2 and 4.6 mA cm−2 for Pt2.7Cu@CNTs and Pt1.2Cu@CNTs, respectively. b The rate of H2 production and faradaic efficiency on the cathode at different potentials with the Pt2.7Cu@CNTs and Pt@CNTs as the anode catalysts. c Durability test of the Pt2.7Cu@CNTs at a constant potential of 0.6 V versus RHE. The blue arrows denote the time of replacing the electrolyte. The tests in a–c are performed in CO-saturated 1 M KOH solution at 25 °C. d, e The k2-weighted EXAFS spectra of the Cu K-edge (d) and Pt L-edge (e) of the Pt2.7Cu@CNTs sample before and after 475 h of stability test, compared with those of Cu foil, CuO, Pt foil, and PtO2, respectively
