The role of electrolyte fluidity on the power generation characteristics of thermally driven electrochemical cells

Hasan, Syed Waqar and Said, Suhana Mohd and Shuhaimi, Ahmad and Jaffery, Hasan Abbas and Sabri, Mohd Faizul Mohd (2018) The role of electrolyte fluidity on the power generation characteristics of thermally driven electrochemical cells. Sains Malaysiana, 47 (2). pp. 403-408. ISSN 0126-6039

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Official URL: http://www.ukm.my/jsm/pdf_files/SM-PDF-47-2-2018/U...

Abstract

Thermally driven electrochemical cells (thermocells) are able to convert thermal gradient applied across redox electrolyte into electricity. The performance of the thermocells heavily depends on the magnitude and integrity of the applied thermal gradient. Herein, we study the iodide/triiodide (I-/I3-) based 1-Ethyl-3-methyl-imidazolium Ethylsulfate ([EMIM][EtSO4]) solutions in a thermocell. In order to comprehend the role of fluidity of the electrolyte, we prepared set of solutions by diluting [EMIM][EtSO4] with 0.002, 0.004, and 0.010 mol of Acetonitrile (ACN). We realized a significant improvement in ionic conductivity (σ) and electrochemical Seebeck (Se) of diluted electrolytes as compared to base [EMIM][EtSO4] owing to the solvent organization. However, the infra-red thermography indicated faster heat flow in ACN-diluted-[EMIM] [EtSO4] as compared to the base [EMIM][EtSO4]. Therefore, the maximum power density of base [EMIM][EtSO4] (i.e. 118.5 μW.m-2) is 3 times higher than the ACN-diluted-[EMIM][EtSO4] (i.e. 36.1 μW.m-2) because of the lower thermal conductivity. Hence this paper illustrates the compromise between the fast mass/flow transfer due to fluidity (of diluted samples) and the low thermal conductivity (of the pure [EMIM][EtSO4]).

Item Type: Article
Uncontrolled Keywords: Electrochemical cells; energy harvesting; ionic liquids; redox couple; thermoelectrics
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 08 Aug 2019 08:46
Last Modified: 08 Aug 2019 08:46
URI: http://eprints.um.edu.my/id/eprint/21930

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