Combining thermogalvanic corrosion and thermogalvanic redox couples for improved electrochemical waste heat harvesting

Alzahrani, Hassan A. H.; Black, Jeffrey J.; Goonetilleke, Damian; Panchompoo, Janjira; Aldous, Leigh

doi:10.1016/j.elecom.2015.06.007

Cited by 21 publications

(20 citation statements)

References 24 publications

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“…-1.5 mV K -1 , [40] and is consistent with thermoelectrochemical potentials measured in CR2032 casings being lower than those measured by more impractical but precisely thermostated assemblies. [11,19,35,52] The reason for this is discussed in detail in the modelling section. Similar power curves were also obtained for thermocells containing the poly(sodium acrylate) and agar agar gelled electrolytes ( Figures S7 and S9, respectively); both displayed the expected parabola power curve.…”

Section: Cyclic Voltammetric Characterisation Of the Electrolytesmentioning

confidence: 99%

“…[1,2] As the efficiency of heat-to-current conversion is directly proportional to both the temperature difference and the Seebeck coefficient squared, the exceptional Seebeck coefficients of thermoelectrochemical systems have encouraged their investigation for efficient thermal energy harvesting of low-grade sources, such as body heat. [11][12][13] Nanostructuring the electrodes has also been demonstrated to be relatively facile but highly beneficial. [14,15] The high Seebeck coefficients common to effective thermoelectrochemical systems are typically driven by significant changes in the aqueous solvation sphere around ions.…”

Section: Introductionmentioning

confidence: 99%

“…[16] However, a vast range of possible interactions (which have barely begun to be investigated) are also possible entropic driving forces, e.g. explicitly coordinating non-aqueous media, [14] high spin low spin transitions, [17] electrode side reactions, [11] electrode intercalation processes [18] and solution-phase synergistic interactions. [19] Liquid electrolytes are effective for thermoelectrochemical systems (or 'thermocells'), insomuch as they can possess high Seebeck coefficients for certain redox couples, typically possess high solubility for these redox couples, result in a high ionic conductivity of these redox couples, and are flexible.…”

Section: Introductionmentioning

confidence: 99%

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Thermoelectrochemistry using conventional and novel gelled electrolytes in heat-to-current thermocells

Black

Aldous

2017

Electrochimica Acta

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Section: Cyclic Voltammetric Characterisation Of the Electrolytesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermoelectrochemistry using conventional and novel gelled electrolytes in heat-to-current thermocells

Black

Aldous

2017

Electrochimica Acta

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“…This can be explained by the improved thermal gradient between the electrodes when the composite membranes are embedded in the thermocells. In order to calculate the actual thermal gradient between the electrodes we use Δ T act = Δ V / S e where Δ T act , Δ V , and S e are actual temperature gradient, open‐circuit voltage, and electrochemical Seebeck coefficient, respectively . The S e of the (Iˉ/I 3 ˉ):(Emim)(EtSO 4 ) electrolyte is evaluated by a conventional two‐beaker experiments.…”

Section: Resultsmentioning

confidence: 99%

Thermally Resistive Electrospun Composite Membranes for Low‐Grade Thermal Energy Harvesting

Hasan

Said

Sabri

et al. 2018

Macro Materials & Eng

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In this work, thermally insulating composite mats of poly(vinylidene fluoride) (PVDF) and polyacrylonitrile (PAN) blends are used as the separator membranes. The membranes improve the thermal‐to‐electrical energy conversion efficiency of a thermally driven electrochemical cell (i.e., thermocell) up to 95%. The justification of the improved performance is an intricate relationship between the porosity, electrolyte uptake, electrolyte uptake rate of the electrospun fibrous mat, and the actual temperature gradient at the electrode surface. When the porosity is too high (87%) in PAN membranes, the electrolyte uptake and electrolyte uptake rate are significantly high as 950% and 0.53 µL s−1, respectively. In such a case, the convective heat flow within the cell is high and the power density is limited to 32.7 mW m−2. When the porosity is lesser (up to 81%) in PVDF membranes, the electrolyte uptake and uptake rate are relatively low as 434% and 0.13 µL s−1, respectively. In this case, the convective flow shall be low, however, the maximum power density of 63.5 mW m−2 is obtained with PVDF/PAN composites as the aforementioned parameters are optimized. Furthermore, multilayered membrane structures are also investigated for which a bilayered architecture produces highest power density of 102.7 mW m−2.

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“…Meanwhile, the existence of minor peaks matching the Ni phase supports the idea that the Ni to NiO transition is still incomplete. The chemical reaction and phase transition are still evident at the NiO current collector and electrolyte interface even after 40 h [39] . This could be a reason for the drift observed in the potential ( Fig.…”

Section: Structural Analysis Of Ni Current Collectors After Thermocelmentioning

confidence: 99%

Gas electrodes with nickel based current collectors for molten carbonate electrolyte thermo-electrochemical cells

Kandhasamy

Haarberg

Kjelstrup³

et al. 2020

Journal of Energy Chemistry

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a b s t r a c tThermo-electrochemical cells with inexpensive molten carbonate electrolyte and (CO 2 |O 2 ) gas electrodes allow the possible conversion of high temperature waste heat from industrial processes into electricity. The cell containing eutectic (Li,Na) 2 CO 3 electrolyte with solid MgO dispersion delivers a large Seebeck coefficient of −1.7 mV/K. At present, the (CO 2 |O 2 ) gas electrodes use metallic gold as current collectors in order to avoid the formation of interfering oxide layers during operation. For further reduction in energy generation cost, the gold current collectors should be replaced with an inexpensive and stable alternative. In this study, the suitability of the (molten carbonate fuel cell) MCFC's nickel-based cathodes to operate the molten-carbonate thermo-electrochemical cell, was investigated. Ni current collectors were examined in two different states, as NiO and as lithiated NiO (Li x Ni 1 −x O). The NiO phase shows higher stability than the Li x Ni 1 −x O while the Seebeck coefficient remains above −1.2 mV/K.

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Combining thermogalvanic corrosion and thermogalvanic redox couples for improved electrochemical waste heat harvesting

Cited by 21 publications

References 24 publications

Thermoelectrochemistry using conventional and novel gelled electrolytes in heat-to-current thermocells

Thermoelectrochemistry using conventional and novel gelled electrolytes in heat-to-current thermocells

Thermally Resistive Electrospun Composite Membranes for Low‐Grade Thermal Energy Harvesting

Gas electrodes with nickel based current collectors for molten carbonate electrolyte thermo-electrochemical cells

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