Systems in Water Splitting: The Case of Hematite/Cobalt. Hexacyanoferrate … type metal-oxide semiconductor materials (e.g., TiO2,[2] Fe2O3,[3]. WO3,[4] BiVO4,[5] … mismatch, as the Co t2g hole-acceptor level of CoFe-PB is at lower energy than … from the surface states occurs at lower potentials, in accord- ance with the …

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