Work

Temperature effect on redox voltage in LixCo[Fe(CN)6]y

Year: 2017

Type: article

Abstract: 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.

Source: AIP Advances

DOI: 10.1063/1.4979888

Authors: Rögnvaldur Líndal Magnússon, Wataru Kobayashi, Masamitsu Takachi, Yutaka Moritomo

Institution: University of Tsukuba

Language: English

Topic: Advanced Thermoelectric Materials and Devices

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,350

Funders: Nippon Sheet Glass Foundation for Materials Science and Engineering, Yazaki Memorial Foundation for Science and Technology, Japan Society for the Promotion of Science