High-Nuclear Co-Added Polyoxometalate-Based Chain: Electrocatalytic Oxygen Production.

A high-nuclear Co-added polyoxometalate (CoAP) was synthesized via a hydrothermal reaction: H 14.5 K 9 Na 7.5 -{[Co 8 (μ 2 -OH)(μ 3 -OH) 2 (H 2 O) 2 (Co(H 2 O)GeW 6 O 26 )( B -α-GeW 9 O 34 ) 2 ][BO(OH) 2 ][Co 12 (μ 2 -OH)(μ 3 -OH) 5 (H 2 O) 3 (Co(H 2 O)GeW 6 O 26 )(GeW 6 O 26 )( B -α-GeW 9 O 34 )]}·46H 2 O ( 1 ). The polyoxoanion of 1 contains a large Co 20 cluster gathered by lacunary GeW 6 O 26 and GeW 9 O 34 subunits. 1 represents a one-dimensional (1D) chain formed by adjacent polyoxoanions coupling through a CoO 6 double bridge, showing the first example of a high-nuclear CoAP-based inorganic chain. 1 served as an efficient electrocatalyst in oxygen evolution reactions (OERs).