Moon, Subin Park, Young Sun Lee, Hyungsoo Jeong, Wooyong Kwon, Eunji Lee, Jeongyoub Yun, Juwon Lee, Soobin Kim, Jun Hwan Yu, Seungho Moon, Jooho 2024-07-18T08:00:54Z 2024-07-18T08:00:54Z 2024-07-18 2024-08 1754-5692 https://pubs.kist.re.kr/handle/201004/150280 Hydrogen peroxide (H2O2) represents a valuable chemical compound and promising energy source due to its high energy density, comparable with that of compressed H-2. However, its production predominantly relies on an energy-intensive process. In this study, we present an efficient strategy for producing H2O2 through a photoelectrochemical (PEC) approach, which involves a 2e(-)-mediated oxygen reduction reaction, integrating Mo-anchored MoOx with a Cu3BiS3-based photocathode. The MoOx-supported Mo improves the adsorption strength of peroxide species and facilitates electron transport, resulting in outstanding activity toward H2O2 production. Consequently, the resulting Cu3BiS3-based photocathode demonstrates significantly enhanced performance, achieving a photocurrent density of 5.21 mA cm(-2) at 0.35 V versus the reversible hydrogen electrode (RHE), a high onset potential of 0.9 V-RHE, and 97% selectivity toward H2O2. Additionally, we successfully implemented an unassisted PEC-PEC coplanar system by coupling a Cu3BiS3-based photocathode with a perovskite-based photoanode, achieving a solar-to-chemical conversion efficiency of 1.46%. English Royal Society of Chemistry Unassisted photoelectrochemical hydrogen peroxide production over MoOx-supported Mo on a Cu3BiS3 photocathode Article 10.1039/d4ee00741g 1 Energy & Environmental Science, v.17, no.15, pp.5588 - 5600 Energy & Environmental Science 17 15 5588 5600 N scie scopus 001265393000001 2-s2.0-85198047147 Chemistry, Multidisciplinary Energy & Fuels Engineering, Chemical Environmental Sciences Chemistry Energy & Fuels Engineering Environmental Sciences & Ecology Article OXYGEN REDUCTION REACTION H2O2 INTERFACE SURFACE CO