Zhang Haipeng, He Yujie, Bao Xiaolei, Wang Zhaoqi, Jiang Weiyi, Zheng Liren, Fan Yuchen, Zheng Zhaoke, Cheng Hefeng, Wang Peng, Liu Yuanyuan, Wang Zeyan, Huang Baibiao
State Key Laboratory of Crystal MaterialsShandong University, Jinan, 250100, P. R. China.
State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P. R. China.
ChemSusChem. 2023 Oct 6;16(19):e202300666. doi: 10.1002/cssc.202300666. Epub 2023 Jul 28.
In this work, α-Fe O photoanode consisted of (110)-oriented α-Fe O single crystals were synthesized by a facile hydrothermal method. By using particular additive (C MimBF ) and regulation of hydrothermal reaction time, the Fe-25 consisted of a single-layer of highly crystalline (110)-oriented crystals with fewer grain boundaries, which was vertically grown on the substrate. As a result, the charge separation efficiency and photoelectrochemical (PEC) performance of Fe-25A (Fe-25 after dehydration treatment) have been greatly improved. Fe-25A yields a photocurrent of 1.34 mA cm (1.23 V vs RHE) and an incident photon-to-current conversion efficiency (IPCE) of 31.95 % (380 nm). With the assistance of cobalt-phosphate water oxidation catalyst (Co-Pi), the PEC performance could be further improved by enhancing the holes transfer at electrode/electrolyte interface and inhibiting surface recombination. Fe-25A/Co-Pi yields a photocurrent of 2.67 mA cm (1.23 V vs RHE) and IPCE value of 50.8 % (380 nm), which is 3.67 times and 2.39 times as that of Fe-2A/Co-Pi. Our work provides a simple method to fabricate highly efficient Fe O photoanodes consist of characteristic (110)-oriented single crystals with high crystallinity and high quality interface contact to enhance charge separation efficiencies.
