Laser-induced deposition of Ni, Co-doped FeOOH cocatalysts on WO photoanodes and elucidating their roles in water oxidation in terms of carrier dynamics

• Published in: Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2023-02, Vol.11 (9), p.4598-467
• Main Authors: Kim, Hee Yeong, Kong, Heejung, Kim, Jong Hwa, Yang, Won-Geun, Lee, Hyein, Ko, Seonmi, Lee, Hee Jin, Piao, Guangxia, Park, Hyunwoong, Chae, Weon-Sik, Yeo, Junyeob
• Format: Article
• ISSN: 2050-7488; 2050-7496
• DOI: 10.1039/d2ta07004a

Oxygen evolution cocatalysts (OECs) are frequently integrated with monoclinic WO 3 photoanodes to improve their photoelectrochemical (PEC) water-splitting performance. In this study, we propose laser-induced catalyst deposition (LICD) for the deposition of FeOOH and doped FeOOH OECs on WO 3 photoanodes. Furthermore, the roles of OECs in PEC water-splitting are examined in terms of carrier dynamics using ultrafast time-resolved photoluminescence (TRPL) analyses. The highlight of the TRPL study is using shortpass and longpass optical filters to show that the OECs extend the lifetime of holes excited from low-lying states. As a result, it is considered that the OECs provide hole-storing trap states within the bandgap to increase the number of long-lived holes, resulting in improved PEC performance of WO 3 photoanodes. Simply oxygen evolution Ni, Co-doped FeOOH cocatalyst layers were deposited by laser-induced deposition on WO 3 photoanodes for enhanced PEC performance.