Research / 2020 / Article / Fig 3

Research Article

Intermetallic Cu5Zr Clusters Anchored on Hierarchical Nanoporous Copper as Efficient Catalysts for Hydrogen Evolution Reaction

Figure 3

Electrochemical properties of catalysts for HER catalysis. (a, b) Polarization curves (a) and Tafel plots (b) of nanoporous Cu, Cu/Cu5Zr, and Zr catalyst electrodes and nanoporous Cu-supported Pt/C in 1 M KOH solution. Scan rate: 1 mV s-1 for nanoporous catalyst electrodes. (c) Nyquist plot comparing electrochemical impedance spectra (EIS) of nanoporous Cu, Cu/Cu5Zr, and Zr catalyst electrodes and nanoporous Cu-supported Pt/C. Inset: their corresponding charge transfer resistances (). (d, e) Comparison of polarization curve (d) and Tafel plot (e) of the pristine NP Cu/Cu5Zr with those of electrooxidized NP Cu/Cu5Zr (NP Cu/Cu5Zr-EO) and NP Cu-supported ZrO2 nanoparticles (NP Cu/ZrO2) in 1 M KOH electrolyte. Scan rate: 1 mV s-1. (f) Polarization curves for nanoporous Cu/Cu5Zr before and after H2SO4 treatment. (g) Comparison of overpotentials at current density of 100 mA cm-2 for nanoporous Cu/Cu5Zr with previously reported HER catalysts in 1 M KOH electrolyte (supplementary Table S2).