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Ki-Yong Yoon1 Hyo-Jin Ahn1 Myung-Jun Kwak1 Sun-I Kim1 Juhyung Park1 Ji-Hyun Jang1

1, UNIST, Ulsan, , Korea (the Republic of)

We report novel porous structures of hematite and Ti-doped FeOOH (Ti-FeOOH) oxygen evolution catalysts (OECs) for efficient PEC water splitting. By selectively decorating Ti-FeOOH OECs on the inner surface of porous hematite, the overall PEC performance was dramatically increased without interrupting light absorption of hematite by outer surface OCEs. The photocurrent density of Ti-FeOOH/hematite PEC systems was 4.06 mA cm-2 at 1.23VRHE with excellent long-term stability for 36 h, representing the state-of-the-art performance among hematite-based systems. Importantly, the proposed hematite photoanode and Ti-FeooH OCEs can be fabricated by a simple and cost-efficient solution-based method, suggesting a novel approach to commercialization of hematite based PEC water splitting systems.

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