Table 2. Summarized Performance Metrics for PS/PC, PEC, and PV+EC Systems.

	PS/PC	PEC	PV+EC
Performance metrics	Formation rate	Formation rate (current density)	Formation rate (current density)
	Conversion	Potential/voltage	Potential/voltage
	Turnover number (TON)
	Selectivity	Selectivity (Faradic efficiency, FE)	Selectivity (Faradic efficiency, FE)
	Quantum efficiency (QE)	Solar-to-fuel conversion efficiency (SFE)	Solar-to-fuel conversion efficiency (SFE)
	Durability	Incident photon-to-current conversion efficiency (IPCE)	Durability
		Absorbed photon-to-current conversion efficiency (APCE)
		Durability