Title

Extraction and energy gap determination of various plant dyes using UV-vis analysis for dye-sensitized solar cells

Date of Publication

2016

Document Type

Bachelor's Thesis

Degree Name

Bachelor of Science in Chemistry Minor in Business Studies

Subject Categories

Chemistry

College

College of Science

Department/Unit

Chemistry

Thesis Adviser

Francisco Franco, Jr.

Defense Panel Chair

Glenn V. Alea

Defense Panel Member

Carlo Antonio Ng
Joan Candice Ondevilla

Abstract/Summary

Over the years , many researchers and applications have further revolutionized dye-sensitized solar cells by increasing its efficiency while maintaining its durability and low-cost production. The objectives of the study were to extract natural dyes that can be used for DSSC and to determine which extracted dye obtained the highest absorptivity coefficient and the lowest average onset energy gap, which would be the best candidate to construct the DSSC.

The extracted pigments were from beet vegetables, red cabbage, spinach, and strawberry. They were extracted using various methods and solvents. The UV-vis spectrometer was used to analyze the absorbance of the extracted dye samples, while the IR spectrometer was used to determine the common functional groups present in the dye.

The best extraction method was concluded to be the spinach boiled in ethanol dye. This method was able to obtain the lowest average Egop onset at 1.814eV and the highest average absorptivity coefficient of 83.307% (w/v) cm1 among all the extracted dyes. The selection of the best plant dye and method were based on its absorptivity coefficient and onset energy gap. A material having a high absorptivity coefficient would result to more photons being absorbed from light and having low onset energy gap would require lesser energy to excite the electrons from the ground state to a higher energy state.

Abstract Format

html

Language

English

Format

Print

Accession Number

TU19913

Shelf Location

Archives, The Learning Commons, 12F, Henry Sy Sr. Hall

Physical Description

viii, 74 leaves, illustrations (some color), 29 cm. + 1 computer disc (4 3/4 in.)

Keywords

Dye plants; Dye-sensitized solar cells; Dyes and dyeing

Embargo Period

5-10-2021

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