A new mechanism for interpreting the effect of TiO2 nanofillers in quasi-solid-state dye-sensitized solar cells

I. Ping Liu, Li Wei Wang, Ming Hsiang Tsai, Yun Yu Chen, Hsisheng Teng, Yuh Lang Lee

研究成果: Article

摘要

A new mechanism is proposed against the Grotthuss-type exchange reaction, to interpret the TiO2 nanofiller effect in quasi-solid-state dye-sensitized solar cells. Generally, the inclusion of TiO2 nanofillers in a polymer gel electrolyte causes an enhanced diffusion coefficient and a reduced charge transfer resistance at the electrolyte/counter-electrode interface, thereby improving the photovoltaic performance of the corresponding solar cell. Herein, liquid electrolytes are treated by TiO2 nanoparticles, and the resultant electrolytes yield similar effects on both the electrolyte properties and cell performance. This result suggests a facilitated movement of the triiodide species; however, it cannot be elucidated by the Grotthuss-type mechanism, because of the absence of nanoparticles in such liquid electrolytes. The X-ray photoelectron spectroscopy analysis shows that the TiO2 particles can adsorb iodide ions through their acidic surfaces. The adsorption of iodide ions leads to negatively charged surfaces, which further induces attraction to cations. As a result, cation concentrations in the electrolyte are reduced, and furthermore, the triiodide species can move more easily owing to the attenuated electrostatic interaction with cations. This mechanism is considered to be a dominant reason for the TiO2 nanofiller effect in quasi-solid-state dye-sensitized solar cells.

原文English
文章編號226693
期刊Journal of Power Sources
433
DOIs
出版狀態Published - 2019 九月 1

指紋

Electrolytes
solar cells
dyes
electrolytes
solid state
Cations
Positive ions
Iodides
cations
iodides
Ions
Nanoparticles
nanoparticles
Liquids
liquids
Coulomb interactions
Dye-sensitized solar cells
attraction
Charge transfer
Solar cells

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

引用此文

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title = "A new mechanism for interpreting the effect of TiO2 nanofillers in quasi-solid-state dye-sensitized solar cells",
abstract = "A new mechanism is proposed against the Grotthuss-type exchange reaction, to interpret the TiO2 nanofiller effect in quasi-solid-state dye-sensitized solar cells. Generally, the inclusion of TiO2 nanofillers in a polymer gel electrolyte causes an enhanced diffusion coefficient and a reduced charge transfer resistance at the electrolyte/counter-electrode interface, thereby improving the photovoltaic performance of the corresponding solar cell. Herein, liquid electrolytes are treated by TiO2 nanoparticles, and the resultant electrolytes yield similar effects on both the electrolyte properties and cell performance. This result suggests a facilitated movement of the triiodide species; however, it cannot be elucidated by the Grotthuss-type mechanism, because of the absence of nanoparticles in such liquid electrolytes. The X-ray photoelectron spectroscopy analysis shows that the TiO2 particles can adsorb iodide ions through their acidic surfaces. The adsorption of iodide ions leads to negatively charged surfaces, which further induces attraction to cations. As a result, cation concentrations in the electrolyte are reduced, and furthermore, the triiodide species can move more easily owing to the attenuated electrostatic interaction with cations. This mechanism is considered to be a dominant reason for the TiO2 nanofiller effect in quasi-solid-state dye-sensitized solar cells.",
author = "Liu, {I. Ping} and Wang, {Li Wei} and Tsai, {Ming Hsiang} and Chen, {Yun Yu} and Hsisheng Teng and Lee, {Yuh Lang}",
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AU - Liu, I. Ping

AU - Wang, Li Wei

AU - Tsai, Ming Hsiang

AU - Chen, Yun Yu

AU - Teng, Hsisheng

AU - Lee, Yuh Lang

PY - 2019/9/1

Y1 - 2019/9/1

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