Energy harvesting from humidity changes with a flexible coaxial electrode solid-state cell

RSC Advances ◽  
2014 ◽  
Vol 4 (56) ◽  
pp. 29759-29764
Author(s):  
Jesse Smithyman ◽  
Zhiyong Liang
Keyword(s):  
Free Energy ◽  
Solid State ◽  
Energy Harvesting ◽  
Relative Humidity ◽  
Gibbs Free Energy ◽  
Concentration Gradients ◽  
Electrode Cell ◽  
Solid State Cell ◽  
Coaxial Electrode

A measurable Gibbs free energy is obtained in a coaxial electrode cell from concentration gradients induced by changes in the relative humidity.

scholarly journals Superionic Solid Electrolyte Li7La3Zr2O12 Synthesis and Thermodynamics for Application in All-Solid-State Lithium-Ion Batteries

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 281
Author(s):  
Daniil Aleksandrov ◽  
Pavel Novikov ◽  
Anatoliy Popovich ◽  
Qingsheng Wang
Keyword(s):  
Free Energy ◽  
Solid State ◽  
Lithium Ion Batteries ◽  
Gibbs Free Energy ◽  
Thermodynamic Characteristics ◽  
Lithium Ion ◽  
Standard Enthalpy Of Formation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Binary Compounds

Solid-state reaction was used for Li7La3Zr2O12 material synthesis from Li2CO3, La2O3 and ZrO2 powders. Phase investigation of Li7La3Zr2O12 was carried out by x-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive x-ray spectroscopy (EDS) methods. The thermodynamic characteristics were investigated by calorimetry measurements. The molar heat capacity (Cp,m), the standard enthalpy of formation from binary compounds (ΔoxHLLZO) and from elements (ΔfHLLZO), entropy (S0298), the Gibbs free energy of the Li7La3Zr2O12 formation (∆f G0298) and the Gibbs free energy of the LLZO reaction with metallic Li (∆rGLLZO/Li) were determined. The corresponding values are Cp,m = 518.135 + 0.599 × T − 8.339 × T−2, (temperature range is 298–800 K), ΔoxHLLZO = −186.4 kJ·mol−1, ΔfHLLZO = −9327.65 ± 7.9 kJ·mol−1, S0298 = 362.3 J·mol−1·K−1, ∆f G0298 = −9435.6 kJ·mol−1, and ∆rGLLZO/Li = 8.2 kJ·mol−1, respectively. Thermodynamic performance shows the possibility of Li7La3Zr2O12 usage in lithium-ion batteries.

scholarly journals Moisture desorption isotherms of cucumber seeds: modeling and thermodynamic properties

2015 ◽  
Vol 37 (3) ◽  
pp. 218-225 ◽  
Author(s):  
Paulo Cesar Corrêa ◽  
Maycon Fagundes Teixeira Reis ◽  
Gabriel Henrique Horta de Oliveira ◽  
Ana Paula Lelis Rodrigues de Oliveira ◽  
Fernando Mendes Botelho
Keyword(s):  
Free Energy ◽  
Relative Humidity ◽  
Thermodynamic Properties ◽  
Moisture Content ◽  
Gibbs Free Energy ◽  
Content Increase ◽  
Statistical Parameters ◽  
Thermodynamic Relation ◽  
Differential Enthalpy ◽  
Desorption Isotherms

Hygroscopic equilibrium curves or sorption isotherms are important in order to define dehydration limits of the product, estimate moisture content alterations under environment conditions and to acquire moisture content values for safe storage. This work aimed to determine desorption isotherms of cucumber seeds stored at different temperature (10, 20, 30, 40 and 50 ºC) and relative humidity (0.11 to 0.96) and the thermodynamic properties of this process. Mathematical models were fitted to experimental data in order to represent the agricultural products hygroscopicity. Net isosteric heat of desorption was performed based on the Clausius-Clapeyron thermodynamic relation and Gibbs free energy through the Van't Hoff equation. Based on statistical parameters, Modified Henderson model was the one that best represented hygroscopicity of cucumber seeds. Equilibrium moisture content of cucumber seeds decreased with temperature increment at a constant value of relative humidity. Differential enthalpy values, representing the energy required to remove moisture from the cucumber seeds, ranged from 2923 to 2469 kJ. kg-1. Values of differential entropy and Gibbs free energy decreased with moisture content increase. Enthalpy-entropy compensation theory is valid for the sorption of cucumber seeds, in which the water sorption mechanism in cucumber seeds can be considered to be enthalpy controlled.

Combining Solid-State and Solution Calorimetry for the Gibbs Free Energy Calculation of Polymorphs To Determine the Relative Stability and Solubility

2015 ◽  
Vol 16 (1) ◽  
pp. 12-24 ◽  
Author(s):  
Daniel S. Hsieh ◽  
Daniel Roberts ◽  
Thorsten Rosner ◽  
Tamar Rosenbaum ◽  
Chiajen Lai ◽  
...  
Keyword(s):  
Free Energy ◽  
Solid State ◽  
Gibbs Free Energy ◽  
Relative Stability ◽  
Solution Calorimetry ◽  
Free Energy Calculation ◽  
Energy Calculation
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