Surface Modification of Y2Ti2O5S2 with Co3O4 Co‐catalyst for Photocatalytic Oxygen Evolution. Issue 12 (7th September 2022)

• Record Type: Journal Article
• Authors: Lin, Lihua; Polliotto, Valeria; Vequizo, Junie Jhon M.; Tao, Xiaoping; Liang, Xizhuang; Ma, Yiwen; Hisatomi, Takashi; Takata, Tsuyoshi; Domen, Kazunari
• Is Part Of: ChemPhotoChem. Volume 6:Issue 12(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-09-07
• Subjects: photocatalysis -- water splitting -- oxygen evolution -- oxysulfide -- cobalt oxide; Photochemistry -- Periodicals; Periodicals; Electronic journals; 541.35
• DOI: 10.1002/cptc.202200209
• Languages: English
• ISSNs: 2367-0932

Abstract

Abstract: Y2 Ti2 O5 S2 (YTOS), an oxysulfide material, has attracted attention as a photocatalyst due to its optical absorption at wavelengths up to 650 nm, and its ability to split water into hydrogen and oxygen. However, the performance of YTOS in photocatalytic water splitting has remained low. One important factor accounting for this poor activity is the absence of highly efficient active sites. Surface modification with oxygen‐evolution co‐catalysts is indispensable for enhancing the activity and durability of non‐oxide narrow‐bandgap photocatalysts. Herein, we report the preparation of cobalt oxide (Co3 O4 )‐loaded YTOS for photocatalytic oxygen evolution. The Co3 O4 co‐catalyst was loaded by thermal decomposition of cobalt nitrate. The as‐obtained sample showed significantly enhanced activity in the oxygen evolution reaction compared with unmodified or IrO2 ‐loaded YTOS. Transient absorption spectroscopy revealed that the Co3 O4 co‐catalyst captured holes and promoted charge separation, which accounted for the enhanced activity. Abstract : Co3 O4 ‐loaded oxysulfide Y2 Ti2 O5 S2 (YTOS) showed enhanced activity in the photocatalytic oxygen evolution reaction compared with pristine and IrO2 ‐loaded YTOS. The improved performance was mainly due to the ability of the Co3 O4 co‐catalyst to efficiently capture holes and thus promote charge separation.