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Water Splitting Performance Enhancement of the TiO 2 Nanorod Array Electrode with Ultrathin Black Phosphorus Nanosheets
Author(s) -
Xu Yuanmei,
Wang Xin,
Jin Mingliang,
Kempa Krzysztof,
Shui Lingling
Publication year - 2020
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201901456
Subject(s) - nanorod , materials science , exfoliation joint , photocurrent , x ray photoelectron spectroscopy , water splitting , black phosphorus , graphene , chemical engineering , photocatalysis , heterojunction , photoluminescence , electrode , nanomaterials , nanotechnology , optoelectronics , catalysis , chemistry , biochemistry , engineering
Metal free two‐dimensional (2D) semiconductor nanomaterial black phosphorus (BP) is a promising photocatalyst for solar H 2 evolution. Here, ultrathin BP nanosheets were prepared through organic salt sodium citrate assisted exfoliation of bulk BP. Further, an efficient photoelectrode for photoelectrochemical water splitting was developed based on TiO 2 nanorod arrays, coated with ultrathin black phosphorus nanosheets. Compared to the pure TiO 2 nanorod arrays, this structure exhibits reduced photoluminescent emission, longer carrier lifetime, and a strong photocurrent density enhancement of about 140 %. The high photoelectrochemical performance indicated the formed 2D‐1D BP/TiO 2 heterostructure facilitates the charge separation and transfer. The interfacial interactions between black phosphorus and TiO 2 were thoroughly investigated with XPS and FTIR spectroscopy.