Temperature effect on redox voltage in LixCo[Fe(CN)6]y
| Autor: | Wataru Kobayashi, Rögnvaldur Líndal Magnússon, Yutaka Moritomo, Masamitsu Takachi |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Chemistry Electric potential energy Analytical chemistry General Physics and Astronomy 02 engineering and technology 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Redox lcsh:QC1-999 Cobalt hexacyanoferrate Sign reversal Seebeck coefficient 0103 physical sciences Thermoelectric effect 0210 nano-technology lcsh:Physics Voltage |
| Zdroj: | AIP Advances, Vol 7, Iss 4, Pp 045002-045002-6 (2017) |
| ISSN: | 2158-3226 |
| Popis: | The electrochemical thermoelectric (TE) coefficient (SEC≡∂V∂T; V and T are the redox potential and temperature, respectively) is a significant material parameter, because it enable us to convert heat into electricity. Here, we systematically investigated the TE properties of cobalt hexacyanoferrate (Co-HCF), LixCo[Fe(CN)6]y, against the Li concentration (x). |SEC| is higher than the Seebeck coefficient (= 0.2 mV/K at room temperature) of Bi2Te3 and distributes from 0.2 to 0.8 mV/K. We further observed a sign reversal behavior of SEC: SEC is negative at y =0.71 while it is negative (positive) at x≤0.3 (x≥0.6) at y =0.90. Based on the ionic model, we qualitatively reproduced the sign reversal behavior by including the volume expansion effect. These arguments suggest that SEC in solid is mainly governed by the electrostatic energy. |
| Databáze: | OpenAIRE |
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