Jeon, Tae Hwa Park, Cheolwoo Kang, Unseock Moon, Gun-hee Kim, Wooyul Park, Hyunwoong Choi, Wonyong 2024-01-12T06:30:38Z 2024-01-12T06:30:38Z 2023-11-21 2024-01 0926-3373 https://pubs.kist.re.kr/handle/201004/79673 Hematite (α-Fe2O3) is renowned as a promising photoanode for water oxidation, even though it displays poor photoconversion efficiency. In this study, ∼5 nm-thick graphitic carbon nitride (g-C3N4; CN) and metal-incorporated CN (M-CN; M = Ag, Fe, Co) films are uniformly deposited on hematite via a facile one-step evaporation method. Herein, the Co-CN layer leads to the highest photoelectrochemical activity with hematite-based photoanode. The subsequent loading of Co-CN layer with oxygen evolution catalysts (FeNiOOH and CoOOH) further enhances photocurrent density to ∼3.5 mA cm？2 and oxygen evolution at > 95 % of Faradaic efficiency over 24 h at E = 1.23 V. Detailed analysis based on spectroscopic and electrochemical measurements demonstrate that the primary role of CN layer is improving the charge separation efficiency by passivating the hematite surface. Then the incorporated metals contribute to reducing charge transfer resistance and thereby mediating hole transfer to interfacial water. English Elsevier BV Photoelectrochemical water oxidation using hematite modified with metal-incorporated graphitic carbon nitride film as a surface passivation and hole transfer overlayer Article 10.1016/j.apcatb.2023.123167 1 Applied Catalysis B: Environment and Energy, v.340 Applied Catalysis B: Environment and Energy 340 N scie scopus 001108732000001 Chemistry, Physical Engineering, Environmental Engineering, Chemical Chemistry Engineering Article (G-C3N4)-BASED PHOTOCATALYSTS PHOTOGENERATED HOLES WIRE ARRAYS PHOTOANODES EFFICIENT PERFORMANCE DYNAMICS BIVO4 PHOTOOXIDATION ULTRAFAST Carbon nitride Metal incorporation Photoelectrochemical water splitting Junction structure Hole-mediating interlayer