Fabrication and photoelectrochemical activity of hierarchically Porous TiO2–ZnO heterojunction film

Autor:	Malobi Seth, Hasmat Khan, Sunirmal Jana, Srikrishna Samanta
Rok vydání:	2020
Předmět:	Photocurrent Materials science 020502 materials Mechanical Engineering chemistry.chemical_element Heterojunction 02 engineering and technology Colloidal crystal Nanocrystalline material chemistry.chemical_compound 0205 materials engineering X-ray photoelectron spectroscopy chemistry Chemical engineering Mechanics of Materials General Materials Science Titanium isopropoxide Mesoporous material Titanium
Zdroj:	Journal of Materials Science. 55:11907-11918
ISSN:	1573-4803 0022-2461
DOI:	10.1007/s10853-020-04858-2
Popis:	For the first time, we report the fabrication of hierarchically (macro with nested meso) porous nanocrystalline TiO2–ZnO heterojunction film onto fluorine-doped tin oxide-coated glass substrate by colloidal crystal templating technique using poly(methyl methacrylate) (PMMA) spheres as template. Accordingly, the precursor solutions of titanium isopropoxide and zinc acetate dihydrate in the presence of Pluronic P123 were used to impregnate the individual solution into the template. Initially, nanocrystalline TiO2 inverse opal mesoporous film was deposited using the titanium precursor. The film was cured at 450 °C in an air atmosphere. A similar process was adopted to deposit nanocrystalline ZnO inverse opal mesoporous film onto the TiO2 to obtain hierarchically porous TiO2–ZnO heterojunction nanocrystalline film. Morphology of the fabricated films showed a periodic arrangement of macropores, whereas the microstructural analysis confirmed the presence of nested mesopores in the film network. Chemical interaction existed between TiO2 with ZnO forming the heterojunction film was ascertained by X-ray photoelectron spectroscopy. Light harvesting efficiency of the samples was studied, and the photoelectrochemical (PEC) performance of the hierarchically porous heterojunction films as photoanode showed about 5 times enhancement in photocurrent density compared to the pristine metal–oxide–semiconductor film under visible light exposure. The porous nanocrystalline hierarchically porous inverse opal heterojunction film could be used as an efficient photoanode in PEC cell.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8c0b4d987435efe79fd407e75672a747 https://doi.org/10.1007/s10853-020-04858-2 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
Nepřihlášeným uživatelům se plný text nezobrazuje	K zobrazení výsledku je třeba se přihlásit.