Development of GG-DMSO-LII-I2 gel polymer electrolytes for potential dye sensitized solar cell application

Mohd Irman, Muhammad Akmal Hakeem (2022) Development of GG-DMSO-LII-I2 gel polymer electrolytes for potential dye sensitized solar cell application. [Project Paper] (Submitted)

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Abstract

Dye sensitized solar cells (DSSCs) have recently gain attention due to their high solar energy efficiency, low cost, and simple production techniques. Because of these advantageous, DSSCs have been proposed as an innovative replacement for current conventional silicon solar cells. Polymer electrolytes are commonly used as a charge transfer medium in DSSCs. However, polymer electrolytes are based on synthetic polymers that are not eco-friendly. Biopolymers are actively studied in order to replace synthetic polymers as base materials in polymer electrolytes. In this work, gellan gum (GG) biopolymer is employed as a host to prepare gel polymer electrolyte (GPEs). Lithium iodide (LiI) and iodide (I2) salts act as charge carrier supplies. DMSO was added to form a gel-state electrolyte. Two electrolyte systems were prepared which are DMSO-LiI-I2 liquid electrolytes (system 1) and GG-DMSO-LiI-I2 GPEs (system 2). For system 1, electrolyte with 87.36 wt.% DMSO-10.63 wt.% LiI-2.02 wt.% I2 (LA electrolyte) revealed the highest ionic conductivity (σ) of (10.89±0.45) mS cm-1 at room temperature. The highest σ value obtained by the LA3 electrolyte is largely controlled by the charge carrier concentration (n) relative to the mobility (μ). Since the LA3 electrolyte has the highest σ, various amount of gellan gum (GG) was added into this electrolyte composition to form GPEs (system 2). GPE of 5.50 wt.% GG-82.55 wt.% DMSO-10.05 wt.% LiI-1.90 wt.% I2 (GA2 electrolyte) showed the highest σ of 7.63 mS cm-1 at room temperature. High room temperature σ was highly influence by high μ relative to n. The conductivity-temperature study shows that conductivity increased with temperature increased, controlled by the increased in n, not μ. All GPEs in system 2 was fabricated in DSSC. The DSSC with GA2 electrolyte revealed the highest power conversion efficiency (PCE) of (2.15±0.01) % along with highest short circuit current (Jsc) of (4.79±0.01) mA cm-2, impact from the highest σrt due to high μ relative to n, which facilitated the redox process in DSSC. The highest Jsc of DSSC was supported by the lowest charge transfer resistance (Rct) of 36.5 Ω. Based on this work, it can be concluded that biopolymer GG-based GPEs have great potential for use in DSSC applications.

Item Type:	Project Paper
Faculty:	Fakulti Sains
Depositing User:	Ms. ROHANA ALIAS
Date Deposited:	20 May 2024 07:19
Last Modified:	05 Aug 2024 08:03
URI:	http://psaspb.upm.edu.my/id/eprint/1853

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