Abstract
Photocorrosion is a key factor that greatly hinders the stability of photoanodes. Depositing appropriate cocatalysts can effectively protect the semiconductors from photocorrosion as well as improve the photoelectrochemical (PEC) activity. However, the formation of cocatalysts occurs mostly under island growth, making the semiconductors partially unprotected, thus leading to poor stability. Herein, we demonstrate the complex assembly film composed of phenolic ligands (tannic acid) coordinated with Ni and Fe ions (TANF) as a robust cocatalyst for Mo-doped BiVO4 (Mo:BiVO4@TANF) toward PEC water oxidation. The photocurrent density of Mo:BiVO4@TANF at 1.23 V versus reversible hydrogen electrode (RHE) reaches a value of 5.10 ± 0.13 mA cm–2. Furthermore, because the complete coverage of the TANF film can effectively protect the semiconductor from photocorrosion, 92% photocurrent of the integrated photoanode is retained after operating at harsh 1.23 V vs RHE for 3 h. The outstanding activity and stability of the...
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