ChemInform Abstract: In Operando X‐Ray Absorption Fine Structure Studies of Polyoxometalate Molecular Cluster Batteries: Polyoxometalates as Electron Sponges.

Abstract Mo K‐edge XAFS measurements on rechargeable molecular cluster batteries in which (NBu 4 ) 3 [PMo 12 O 40 ] is used as cathode material and Li metal as anode reveal that all 12 Mo 6+ ions in [PMo 12 O 40 ] 3‐ are reduced to Mo 4+ in the discharge process, leading to the formation of [PMo 12 O 40 ] 27‐ , which stores 24 electrons.