“…3d and e, Table S2 and S3 † show that the as-prepared Ru@FeCoP, for both the OER or HER, exhibited the lowest Tafel slope and h 10 among the recently reported noble metal-based electrocatalysts. 3,5,8,15,26,27,30,33,45,[51][52][53][54][55][56][57][58][59][60][61][62] Similarly, the charge transfer speed was also evaluated and analyzed by the EIS diagram. Motivated by the doping of Fe atoms together with the generation of the Ru/FeCoP heterointerface, Ru@FeCoP possessed the smallest R ct value for the HER (0.587 U) and OER (0.88 U) among the assynthesized samples (Fig.…”