Electrochemical properties of polyoxometalate composite materials containing multiple redox centers

Structure and Electronic Properties of Large Oligomeric Heterometallic 3d/CeIV Polyoxometalates

“…Cyclic voltammetry (CV) experiments in 1 M H 2 SO 4 solutions were then conducted to investigate the redox behaviors of BaCe 12 Co 6 and BaCe 6 Ni 8 , respectively (Figure ). At negative potentials, both BaCe 12 Co 6 and BaCe 6 Ni 8 functionalized electrodes show multielectron reduction processes, assigned to multiple electron uptake by {XW 9 } (X = Si, P) moieties. − The current density reaches maximum values at the lowest potential, suggesting the concomitant appearance of hydrogen evolution, albeit at a high overpotential. The overall process appears irreversible since the electron oxidation waves are not observable in the scans toward positive potentials.…”