Table 2. ICP-MS analysis of the trimetallic precatalyst sample: KOH (blank) vs. after catalysis (15 h of controlled potential electrolysis at 1.7 V vs. RHE). BDL = below detection limit.

Sample	P (ppb)	Fe (ppb)	Co (ppb)	Ni (ppb)
KOH (blank)	BDL	43.5	BDL	BDL
KOH (post catalysis)	375.4	54.1	BDL	BDL