Fig. 4. (a) XRD of Cu2(CuTCPP) nanosheets on a FTO electrode with different reaction times ([black circle] Cu(HCOO)2; ◆ Cu4O3; ▲ Cu(OH)2; [blacktriangledown] CuO; ★ Cu2O); (b) HRTEM after 5 h reaction; (c) Cu 2p XPS spectra and (d) O 1s XPS spectra of Cu2(CuTCPP) on FTO before and after 5 h reaction. All potentials were set at –1.55 V vs. Ag/Ag+.
