Che Hassan, Hazirah and Mohd Said, Suhana and Nik Ibrahim, Nik Muhd Jazli and Megat Hasnan, Megat Muhammad Ikhsan and Mohd Noor, Ikhwan Syafiq and Zakaria, Rozalina and Mohd Salleh, Mohd Faiz and Md. Noor, Nur Linahafizza and Abdullah, Norbani (2021) Ultra-high Seebeck coefficient of a thermal sensor through entropic optimisation of ligand length of Fe(ii) spin-crossover (SCO) materials. RSC Advances, 11 (34). pp. 20970-20982. ISSN 2046-2069, DOI https://doi.org/10.1039/d1ra01387d.
Full text not available from this repository.Abstract
In this work, we present a spin-crossover (SCO) complex molecular formulation Fe(L-n)(2)](BF4)(2) in an electrochemical single couple solution. A Seebeck voltage arises when an electrochemical single couple solution is subjected to a temperature difference, resulting in a single couple reaction at either terminal of the electrochemical cell. The ultrahigh Seebeck coefficients were obtained due to a number of molecular optimisation strategies. The Fe(L-16)(2)](BF4)(2) complex demonstrated a maximum Seebeck coefficient of 8.67 mV K-1, achieved through a six-pronged approach to maximise entropy during the transition from low spin (LS) to high spin (HS) through: (i) a change in spin state, (ii) a change in physical liquid crystalline state, (iii) the spin Seebeck effect, (iv) the kosmotropic and chaotropic effect, (v) the fastener effect and (vi) thermal heat absorbance. A reduction of the Seebeck coefficient to 1.68 mV K-1 during the HS-LS transition at higher temperatures is related to the single spin state transition entropy change. In summary, this paper presents a systematic study to identify the contributing factors in the production of a sensor with an ultrahigh Seebeck coefficient for energy harvesting through the optimisation of its molecular entropy elements.
| Item Type: | Article |
|---|---|
| Funders: | Universiti Malaya (FG009-17AFR), Universiti Malaya (GPF022A-2018), Universiti Malaya (IIRG002A-1911SS), Universiti Malaya (IF009-2020) |
| Uncontrolled Keywords: | Ultra-high Seebeck; Thermal sensor; Entropic optimisation; Ligand length; Fe(ii) spin-crossover (SCO) materials |
| Subjects: | Q Science > QD Chemistry |
| Divisions: | Faculty of Engineering > Department of Electrical Engineering Faculty of Science > Department of Chemistry Faculty of Science > Department of Physics |
| Depositing User: | Ms Zaharah Ramly |
| Date Deposited: | 06 Sep 2022 04:05 |
| Last Modified: | 06 Sep 2022 04:05 |
| URI: | http://eprints.um.edu.my/id/eprint/34165 |
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