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Acid adsorption on TiO<inf>2</inf> nanoparticles-an electrochemical properties study

Jung, HS and Lee, JK and Lee, S and Hong, KS and Shin, H (2008) Acid adsorption on TiO<inf>2</inf> nanoparticles-an electrochemical properties study. Journal of Physical Chemistry C, 112 (22). 8476 - 8480. ISSN 1932-7447

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Abstract

The surface of TiO2 photoelectrode was treated by dipping in nitric acid and subsequently coating with solar light absorbing dye. The influence of surface-modified photoelectrodes on the performance of dye-sensitized solar cells (DSCs) was investigated. The nitric acid treatment of the photoelectrode increased DSC energy conversion efficiency from 5.4 to 6.2%, which is mainly attributed to the increase in the photocurrent rather than the change in the open circuit voltage. The comparative studies were done using hydrochloric acid treated TiO2 photoelectrode. This demonstrates that the nitric acid treated photoelectrode retards back electron transfer at the interface with the electrolyte and increases the amount of adsorbed dyes. X-ray photoemission and Fourier transform infrared spectroscopy studies show that the effect of the nitric acid treatment is due to the presence of residual nitrate ions and hydroxyl groups which decrease free surface area and strengthens physical adsorption of dyes. © 2008 American Chemical Society.


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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Jung, HS
Lee, JKjul37@pitt.eduJUL370000-0002-7778-7679
Lee, S
Hong, KS
Shin, H
Centers: Other Centers, Institutes, Offices, or Units > Petersen Institute of NanoScience and Engineering
Date: 5 June 2008
Date Type: Publication
Journal or Publication Title: Journal of Physical Chemistry C
Volume: 112
Number: 22
Page Range: 8476 - 8480
DOI or Unique Handle: 10.1021/jp711689u
Schools and Programs: Swanson School of Engineering > Mechanical Engineering and Materials Science
Refereed: Yes
ISSN: 1932-7447
Date Deposited: 30 Oct 2014 16:40
Last Modified: 22 Jun 2021 13:56
URI: http://d-scholarship.pitt.edu/id/eprint/23428

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