“…10,13,[19][20][21] Although hydrogen spillover was rst discovered in acidic HER systems, current research has also witnessed the spillover behavior in the alkaline HER, which is benecial to strengthening the *H supply for Pt-based binary catalysts in alkali. 10,12,22,23 It must be pointed out that because hydrogen spillover from strong to weak *H sites is intrinsically thermodynamically unfavorable, it will inevitably require an adequate driving force. 18 Moreover, the hydrogen spillover across the interfaces has to overcome the high migration kinetic barriers.…”