High Seebeck coefficient redox ionic liquid electrolytes for thermal energy harvesting

Abraham, Theodore J; MacFarlane, Douglas R.; Pringle, Jennifer M.

doi:10.1039/c3ee41608a

Cited by 248 publications

(301 citation statements)

References 33 publications

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“…However, since the discovery of the spin Seebeck effect in insulators 1,2 , YIG, particularly when grown on gadolinium gallium garnet (GGG), has become the model system for investigating the physics of the spin Seebeck effect. The spin Seebeck effect combines two future technologies: the pure spin currents of spintronics promise to eliminate Joule heating in computing and many other industries [3][4][5] , whereas energy recovery materials seek to harvest waste heat and movement to reduce energy losses, either actively [6][7][8] , or passively from the conventional Seebeck effect 9 or otherwise 10 . The combination of these into a single material provides a great opportunity for energy efficiency and a new generation of future devices.…”

Section: Introductionmentioning

confidence: 99%

Unexpected structural and magnetic depth dependence of YIG thin films

et al. 2017

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We report measurements on yttrium iron garnet (YIG) thin films grown on both gadolinium gallium garnet (GGG) and yttrium aluminium garnet (YAG) substrates, with and without thin Pt top layers. We provide three principal results: the observation of an interfacial region at the Pt/YIG interface, we place a limit on the induced magnetism of the Pt layer and confirm the existence of an interfacial layer at the GGG/YIG interface. Polarised neutron reflectometry (PNR) was used to give depth dependence of both the structure and magnetism of these structures. We find that a thin film of YIG on GGG is best described by three distinct layers: an interfacial layer near the GGG, around 5 nm thick and non-magnetic, a magnetic 'bulk' phase, and a non-magnetic and compositionally distinct thin layer near the surface. We theorise that the bottom layer, which is independent of the film thickness, is caused by Gd diffusion. The top layer is likely to be extremely important in inverse spin Hall effect measurements, and is most likely Y 2 O 3 or very similar. Magnetic sensitivity in the PNR to any induced moment in the Pt is increased by the existence of the Y 2 O 3 layer; any moment is found to be less than 0.02 uB/atom.

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Section: Introductionmentioning

confidence: 99%

Unexpected structural and magnetic depth dependence of YIG thin films

et al. 2017

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“…19 The CHN elemental, ESI-MS and IR data (Experimental) supported the structural formulae of these complexes. Their electronic absorption spectral data in CHCl 3 (Table 1) show d-d bands at about 800 nm and 650 nm, assigned to 4 T 1g (F)  4 T 2g and 4 T 1g (F)  4 T 1g (P) electronic transitions, respectively.…”

Section: Measurement Of S Ementioning

confidence: 65%

“…18 More recently another salt of the same Co couple provided record values of the potential change with temperature that is the key to thermoelectrochemical device applications. 19 For thermal energy harvesting based on the latter devices, research attention has long focused on the [Fe(CN) 6 ] 3-/4-couple in aqueous systems, 20 most recently with respect to the benefits of using high-surface-area electrodes in these devices. 21,22 The efficacy of a redox couple for thermal energy harvesting depends significantly on the dependence of the redox potential, E, on temperature, which is given by the Seebeck coefficient, S e = ∂E/∂T.…”

Section: Introductionmentioning

confidence: 99%

Spin-crossover, mesomorphic and thermoelectrical properties of cobalt(ii) complexes with alkylated N₃-Schiff bases

et al. 2015

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2 O (3), where L [12][13][14][15][16] are N 3 -Schiff bases appended with linear C 12-16 carbon chains at the nitrogen atoms, were obtained in good yields by facile one-pot reactions. The single crystal X-ray structure of complex 1 shows a tetragonally compressed CoN 6 coordination geometry. The melting temperatures of 1 -3 were lower than 373 K, while their decomposition temperatures were above 473 K. All complexes have high-spin Co(II) centres at 300 K and exhibit a columnar mesophase above 383 K. Complexes 1 and 3 showed a normal thermal spin-crossover behaviour with weak hysteresis loops at about 320 K. Hence, these complexes showed uncoupled phase transitions (class iiia). 1 The values for the Seebeck coefficient (S e ) of the cobalt redox couples formed from 1 and 2 were 1.89±0.02 mV K -1 and 1.92±0.08 mV K -1 , respectively, identifying them as potential thermoelectrochemical materials.

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“…8 A thermoelectric cell (TEC) using a multiwalled carbon nanotube electrode has also been developed, which displayed high power output and enhanced efficiency. 1113 However, so far the control on S e has been executed by chance, and missing among the past studies are rational strategies to enhance S e values and to achieve selective ionic conduction.…”

Section: ¹1mentioning

confidence: 99%

Selective Ionic Conduction in Choline Iodide/Triiodide Solid Electrolyte and Its Application to Thermocells

Shimono

Matsuki

Yamada³

et al. 2018

Chem. Lett.

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A thermocell consisting of choline iodide/triiodide solid electrolyte is developed. Seebeck coefficient of the cell is ¹0.87 mV K ¹1 at ambient temperature, which sign is opposite to that of the aqueous I ¹ /I 3 ¹ cell. The ionic conductivity of I 3 ¹ -doped choline iodide is higher than that of pure choline iodide by two to four orders of magnitude, reflecting high conductivity of I 3 ¹ in the solid electrolyte. The selective ionic conduction observed in the solid electrolytes provides a novel design principle for the thermoelectric conversion materials. There are strong needs for fire-resistant, highly conductive ionic solid electrolytes that can be used in all-solid batteries. To date, highly-ionic conductive materials such as Li 9.54 Si 1.74 P 1.44 -S 11.7 Cl 0.3 , 2 AgI, 3 RbAg 4 I 5 , 4 and Li 3 N 5 and their applicability to solid electrochemical devices have been reported. These studies mainly focused on the enhancement of ionic conductivity, and its control on the molecular-level and methodology to achieve selectivity among coexisting ionic species have remained in an early phase of development. 618 Here we report a designed solid electrolyte that shows selective ionic conduction in thermocells.Thermocells are an emerging class of thermoelectric devices, which consist of redox-active chemicals in an electrolyte and two electrodes. When the two electrodes are placed at different temperatures, the equilibrium potential of the redox pair exhibit differences and consequently electrochemical energy is generated. One of the key parameters of a figure of merit for thermocells is Seebeck coefficient (Se), which is defined as S e = V oc /¦T, where V oc is a thermoelectric open-circuit voltage, and ¦T is a temperature difference. Attaining large Seebeck coefficient is an extremely important issue because it provides the large voltage and resulting thermoelectric power per same temperature difference. There are p-and n-type thermocells, which show negative and positive S e values, respectively. The n-type thermocells have been prepared from the redox pairs of has been employed for p-type thermocells. Both the p-and ntype thermoelectric materials are required because the serial connection of p-and n-type cells is a valid and feasible way to achieve efficient thermoelectric conversion. The voltage emerging in thermocells has been explained in connection with the changes in solvation entropy of redox pairs, and accordingly, recent research has focused on the screening of electrolytes. 1417Abraham and co-workers reported a thermocell using an ionic liquid of cobalt complex which showed a high S e value of 2.2 mV K ¹1. 8 A thermoelectric cell (TEC) using a multiwalled carbon nanotube electrode has also been developed, which displayed high power output and enhanced efficiency. 1113 However, so far the control on S e has been executed by chance, and missing among the past studies are rational strategies to enhance S e values and to achieve selective ionic conduction.We have recently developed a supramolecular method...

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High Seebeck coefficient redox ionic liquid electrolytes for thermal energy harvesting

Cited by 248 publications

References 33 publications

Unexpected structural and magnetic depth dependence of YIG thin films

Unexpected structural and magnetic depth dependence of YIG thin films

Spin-crossover, mesomorphic and thermoelectrical properties of cobalt(ii) complexes with alkylated N₃-Schiff bases

Selective Ionic Conduction in Choline Iodide/Triiodide Solid Electrolyte and Its Application to Thermocells

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High Seebeck coefficient redox ionic liquid electrolytes for thermal energy harvesting

Cited by 248 publications

References 33 publications

Unexpected structural and magnetic depth dependence of YIG thin films

Unexpected structural and magnetic depth dependence of YIG thin films

Spin-crossover, mesomorphic and thermoelectrical properties of cobalt(ii) complexes with alkylated N3-Schiff bases

Selective Ionic Conduction in Choline Iodide/Triiodide Solid Electrolyte and Its Application to Thermocells

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Spin-crossover, mesomorphic and thermoelectrical properties of cobalt(ii) complexes with alkylated N₃-Schiff bases