Issue 34, 2021

Ultra-high Seebeck coefficient of a thermal sensor through entropic optimisation of ligand length of Fe(ii) spin-crossover (SCO) materials

Abstract

In this work, we present a spin-crossover (SCO) complex molecular formulation [Fe(Ln)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(L16)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.

Graphical abstract: Ultra-high Seebeck coefficient of a thermal sensor through entropic optimisation of ligand length of Fe(ii) spin-crossover (SCO) materials

Supplementary files

Article information

Article type
Paper
Submitted
20 Feb 2021
Accepted
03 Jun 2021
First published
14 Jun 2021
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2021,11, 20970-20982

Ultra-high Seebeck coefficient of a thermal sensor through entropic optimisation of ligand length of Fe(II) spin-crossover (SCO) materials

H. Che Hassan, S. Mohd Said, N. M. J. Nik Ibrahim, M. M. I. Megat Hasnan, I. S. Mohd Noor, R. Zakaria, M. F. Mohd Salleh, N. L. Md. Noor and N. Abdullah, RSC Adv., 2021, 11, 20970 DOI: 10.1039/D1RA01387D

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