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

Rögnvaldur Líndal Magnússon; Wataru Kobayashi; Masamitsu Takachi; Yutaka Moritomo

doi:10.1063/1.4979888

Temperature effect on redox voltage in Li_xCo[Fe(CN)₆]_y

Rögnvaldur Líndal Magnússon, Wataru Kobayashi, Masamitsu Takachi, Yutaka Moritomo^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

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), Li_xCo[Fe(CN)₆]_y, against the Li concentration (x). |S_EC| 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 S_EC: S_EC 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 S_EC in solid is mainly governed by the electrostatic energy.

Original language	English
Article number	045002
Journal	AIP Advances
Volume	7
Issue number	4
DOIs	https://doi.org/10.1063/1.4979888
Publication status	Published - 2017 Apr 1
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1063/1.4979888

Cite this

@article{77b1711392a14a1ba4404add6f8ba7ed,

title = "Temperature effect on redox voltage in LixCo[Fe(CN)6]y ",

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.",

author = "Magn{\'u}sson, {R{\"o}gnvaldur L{\'i}ndal} and Wataru Kobayashi and Masamitsu Takachi and Yutaka Moritomo",

year = "2017",

month = apr,

day = "1",

doi = "10.1063/1.4979888",

language = "English",

volume = "7",

journal = "AIP Advances",

issn = "2158-3226",

publisher = "American Institute of Physics Publising LLC",

number = "4",

}

TY - JOUR

T1 - Temperature effect on redox voltage in LixCo[Fe(CN)6]y

AU - Magnússon, Rögnvaldur Líndal

AU - Kobayashi, Wataru

AU - Takachi, Masamitsu

AU - Moritomo, Yutaka

PY - 2017/4/1

Y1 - 2017/4/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85016992814&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85016992814&partnerID=8YFLogxK

U2 - 10.1063/1.4979888

DO - 10.1063/1.4979888

M3 - Article

AN - SCOPUS:85016992814

SN - 2158-3226

VL - 7

JO - AIP Advances

JF - AIP Advances

IS - 4

M1 - 045002

ER -

Temperature effect on redox voltage in Li_xCo[Fe(CN)₆]_y

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this