Fig. 3.

Reaction mechanism. a Temperature-programmed reaction spectra of WGS reaction over Cu cubes (c-Cu), octahedra (o-Cu), and rhombic dodecahedra (d-Cu). b C 1 s XPS spectra of Cu cubes (c-Cu), octahedra (o-Cu), and rhombic dodecahedra (d-Cu) after WGS reaction at 548 K measured without exposure to air. c Thermal desorption spectra of Cu cubes (c-Cu), octahedra (o-Cu), and rhombic dodecahedra (d-Cu) after WGS reaction at 548 K. d In situ diffuse reflectance infrared spectra of Cu cubes (c-Cu), octahedra (o-Cu), and rhombic dodecahedra (d-Cu) after WGS reaction at 548 K followed by heating in Ar to 723 K