Ir and Pt loading, current and power density and electrode area targets for PEMWE. Modified from ref. 225 and 395.

Parameter	2020 status	2020 target	2035 target	Future
Ir (mg cm−2)	2–5	1	0.2–0.40	0.05–0.2
Ir (g kW−1)	<2.5 (0.33/0.5/0.67)	0.40	0.05–0.4	0.01–0.4
Pt (mg cm−2)	1–2	1	0.5	0.05
Pt (g kW−1)	0.5–1	0.5	0.25	0.1
Current density (A cm−2)	2	2	3	5
Power density (W cm−2)	3	3	8	10
Electrode area (m2)	0.12	—	—	0.50