Universität zu Köln

Queralto, Albert ORCID: 0000-0001-9101-0033, Frohnhoven, Robert, Mathur, Sanjay ORCID: 0000-0003-2765-2693 and Gomez, Andres (2020). Intrinsic piezoelectric characterization of BiFeO3 nanofibers and its implications for energy harvesting. Appl. Surf. Sci., 509. AMSTERDAM: ELSEVIER. ISSN 1873-5584

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Abstract

Perovskite oxide-based ferroelectrics are interesting in energy applications due to their electrical and optical properties. Nanostructuring opens new paths to increase the surface-to-volume ratio, porosity, and mechanical flexibility as compared with bulk materials, improving and tuning properties associated with piezoelectricity, ferroelectricity, piezoelectrochemistry, electrical conductivity, and catalysis. To elucidate the impact of nanostructuration, in piezoelectricity, we characterized one of the most promising perovskite materials, bismuth ferrite (BiFeO3), in the form of 1D nanostructures, namely nanofibers. A set of BiFeOx precursor nanofibers were electrospun from a chemical sol and calcined at 600 degrees C to obtain the final BiFeO3 nanofiber structure. By scanning the nanofiber sample, the piezo-generated charge at the nanoscale level was studied by Direct Piezoelectric Force Microscopy (DPFM). Our results report that the direct piezoelectric coefficient of the polycrystalline nanofibers is d(33) = 11 pC/N, which corresponds to a smaller value as compared with epitaxial films, 22 pC/N for 60 nm films and 43 pC/N for 400 nm films. The diminishing of piezoelectric property characteristics is mainly attributed to the impact of nanostructuration. The nanofibers impose another clamping factor that decreases the BiFeO3 piezoelectric property, reducing their use as energy harvesters in favor of catalytic applications, water splitting, or photovoltaic applications.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Queralto, Albert UNSPECIFIED orcid.org/0000-0001-9101-0033 UNSPECIFIED Frohnhoven, Robert UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED orcid.org/0000-0003-2765-2693 UNSPECIFIED Gomez, Andres UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-337120
DOI:	10.1016/j.apsusc.2019.144760
Journal or Publication Title:	Appl. Surf. Sci.
Volume:	509
Date:	2020
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	1873-5584
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language PIEZORESPONSE FORCE MICROSCOPY; OXIDE THIN-FILMS; X-RAY; XPS MEASUREMENTS; OXYGEN VACANCY; NANOGENERATOR; MECHANISM; SURFACE; BEHAVIOR; SIZE Multiple languages Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/33712