Core-shell structured Co(OH)F@FeOOH enables highly efficient overall water splitting in alkaline electrolyte

Li, Rong; Wang, Yamei; Chen, Baojin; Zhang, Huaming; Cao, Yan; Xu, Xuefei; Humayun, Muhammad; Debecker, Damien P.; Wang, Chundong

doi:10.1016/j.ijhydene.2023.07.254

Cited by 10 publications

(1 citation statement)

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“…Mai et al introduced a Ti dopant into Fe 2 O 3 crystal structure to enhance charge separation efficiency and bulk kinetics, and deposited FeOOH on the Ti-doped Fe 2 O 3 to promote the charge transfer efficiency and surface kinetics [ 34 ]. FeOOH can facilitate the kinetics of water oxidation as an oxygen evolution cocatalyst, which has widely been utilized in photoanodes [ 35 , 36 , 37 , 38 , 39 ].…”

Section: Introductionmentioning

confidence: 99%

Deposition of FeOOH Layer on Ultrathin Hematite Nanoflakes to Promote Photoelectrochemical Water Splitting

Zhang,

Miao

et al. 2024

Micromachines

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Hematite is one of the most promising photoanode materials for the study of photoelectrochemical (PEC) water splitting because of its ideal bandgap with sufficient visible light absorption and stability in alkaline electrolytes. However, owing to the intrinsically high electron-hole recombination, the PEC performance of hematite is still far below that expected. The efficient charge separation can be achieved via growth of FeOOH on hematite photoanode. In this study, hematite nanostructures were successfully grown on the surface of iron foil by the simple immersion deposition method and thermal oxidation treatment. Furthermore, cocatalyst FeOOH was successfully added to the hematite nanostructure surface to improve charge separation and charge transfer, and thus promote the photoelectrochemical water splitting. By utilizing the FeOOH overlayer as a cocatalyst, the photocurrent density of hematite exhibited a substantial 86% increase under 1.5 VRHE, while the onset potential showed an apparent shift towards the cathodic direction. This can be ascribed to the high reaction area for the nanostructured morphology and high electrocatalytic activity of FeOOH that enhanced the amount of photogenerated holes and accelerated the kinetics of water splitting.

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