![]() Subsequently, these active species, Co 3+ or/and Co 4+, deliver the positive charge to produce O 2 and recover to the initial state to regenerate redox couple. The presence of fluorine by virtue of its high electronegativity induces facile positive charge on the metal center, i.e., on cobalt, thereby Co 2+ ions as an active site accept holes more efficiently from the semiconductor and oxidized to Co 3+ or/and Co 4+. Cyclic voltametric studies reveal that cobalt exists in the mixed valence state. ![]() BiVO 4/Co(OH)F photoanode exhibits an enhanced photocurrent and a cathodic shift of 160 mV in onset potential as compared to the pristine BiVO 4 photoanode. BiVO 4, known for its superior theoretical current density of 7.5 mA/cm 2, suffers from poor photoelectrochemical performance due to the sluggish water oxidation kinetics, recombination of photogenerated carriers, and results in reduced photoelectrochemical water oxidation. In this work, a noble metal-free one-dimensional Co(OH)F and hierarchical BiVO 4 combination as a model system is proposed for an efficient photoelectrochemical catalyst.
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