Universität zu Köln

Fiz, Raquel, Appel, Linus, Gutierrez-Pardo, Antonio ORCID: 0000-0002-6206-1509, Ramirez-Rico, Joaquin ORCID: 0000-0002-1184-0756 and Mathur, Sanjay (2016). Electrochemical Energy Storage Applications of CVD Grown Niobium Oxide Thin Films. ACS Appl. Mater. Interfaces, 8 (33). S. 21423 - 21431. WASHINGTON: AMER CHEMICAL SOC. ISSN 1944-8244

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Abstract

We report here on the controlled synthesis, characterization, and electrochemical properties of different polymorphs of niobium pentoxide grown by CVD of new single-source precursors. Nb2O5 films deposited at different temperatures showed systematic phase evolution from low temperature tetragonal (TT-Nb2O5, T-Nb2O5) to high temperature monoclinic modifications (H-Nb2O5). Optimization of the precursor flux and substrate temperature enabled phase-selective growth of Nb2O5 nanorods and films on conductive mesoporous biomorphic carbon matrices (BioC). Nb2O5 thin films deposited on monolithic BioC scaffolds produced composite materials integrating the high surface area and conductivity of the carbonaceous matrix with the intrinsically high capacitance of nanostructured niobium oxide. Heterojunctions in Nb2O5/BioC composites were found to be beneficial in electrochemical capacitance. Electrochemical characterization of Nb2O5/BioC composites showed that small amounts of Nb2O5 (as low as 5%) in conjunction with BioCarbon resulted in a 7-fold increase in the electrode capacitance, from 15 to 104 F g(-1), while imparting good cycling stability, making these materials ideally suited for electrochemical energy storage applications.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Fiz, Raquel UNSPECIFIED UNSPECIFIED UNSPECIFIED Appel, Linus UNSPECIFIED UNSPECIFIED UNSPECIFIED Gutierrez-Pardo, Antonio UNSPECIFIED orcid.org/0000-0002-6206-1509 UNSPECIFIED Ramirez-Rico, Joaquin UNSPECIFIED orcid.org/0000-0002-1184-0756 UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-266328
DOI:	10.1021/acsami.6b03945
Journal or Publication Title:	ACS Appl. Mater. Interfaces
Volume:	8
Number:	33
Page Range:	S. 21423 - 21431
Date:	2016
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1944-8244
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 CHEMICAL-VAPOR-DEPOSITION; SENSITIZED SOLAR-CELLS; PHOTOELECTROCHEMICAL PROPERTIES; ELECTROCHROMIC DEVICES; NB2O5 NANOWIRES; TEMPERATURE; ELECTRODES; SUPERCAPACITORS; PHOTOANODE; BATTERIES Multiple languages Nanoscience & Nanotechnology; Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/26632