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Metal–Organic Framework Derived Co 3 O 4 /TiO 2 /Si Heterostructured Nanorod Array Photoanodes for Efficient Photoelectrochemical Water Oxidation
Author(s) -
Tang Rui,
Zhou Shujie,
Yuan Zhimin,
Yin Longwei
Publication year - 2017
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201701102
Subject(s) - materials science , photocurrent , heterojunction , nanorod , water splitting , ternary operation , chemical engineering , photocatalysis , electrolyte , nanotechnology , electrode , optoelectronics , catalysis , biochemistry , chemistry , computer science , engineering , programming language
A novel hierarchical structured photoanode based on metal–organic frameworks (MOFs)‐derived porous Co 3 O 4 ‐modified TiO 2 nanorod array grown on Si (MOFs‐derived Co 3 O 4 /TiO 2 /Si) is developed as photoanode for efficiently photoelectrochemical (PEC) water oxidation. The ternary Co 3 O 4 /TiO 2 /Si heterojunction displays enhanced carrier separation performance and electron injection efficiency. In the ternary system, an abnormal type‐II heterojunction between TiO 2 and Si is introduced, because the conduction band and valence band position of Si are higher than those of TiO 2 , the photogenerated electrons from TiO 2 will rapidly recombine with the photogenerated holes from Si, thus leading to an efficient separation of photogenerated electrons from Si/holes from TiO 2 at the TiO 2 /Si interface, greatly improving the separation efficiency of photogenerated hole within TiO 2 and enhances the photogenerated electron injection efficiency in Si. While the MOFs‐derived Co 3 O 4 obviously improves the optical‐response performance and surface water oxidation kinetics due to the large specific surface area and porous channel structure. Compared with MOFs‐derived Co 3 O 4 /TiO 2 /FTO photoanode, the synergistic function in the MOFs‐derived Co 3 O 4 /TiO 2 /Si NR photoanode brings greatly enhanced photoconversion efficiency of 0.54% (1.04 V vs reversible hydrogen electrode) and photocurrent density of 2.71 mA cm −2 in alkaline electrolyte. This work provides promising methods for constructing high‐performance PEC water splitting photoanode based on MOFs‐derived materials.