Title: Bi-directional tuning of thermal transport in SrCoO_x with electrochemically induced phase transitions

Abstract

Unlike the wide-ranging dynamic control of electrical conductivity, there does not exist an analogous ability to tune thermal conductivity by means of electric potential. The traditional picture assumes that atoms inserted into a material’s lattice act purely as a source of scattering for thermal carriers, which can only reduce thermal conductivity. In contrast, here we show that the electrochemical control of oxygen and proton concentration in an oxide provides a new ability to bi-directionally control thermal conductivity. On electrochemically oxygenating the brownmillerite SrCoO_2.5 to the perovskite SrCoO_3–δ, the thermal conductivity increases by a factor of 2.5, whereas protonating it to form hydrogenated SrCoO_2.5 effectively reduces the thermal conductivity by a factor of four. This bi-directional tuning of thermal conductivity across a nearly 10 ± 4-fold range at room temperature is achieved by using ionic liquid gating to trigger the ‘tri-state’ phase transitions in a single device. We elucidated the effects of these anionic and cationic species, and the resultant changes in lattice constants and lattice symmetry on thermal conductivity by combining chemical and structural information from X-ray absorption spectroscopy with thermoreflectance thermal conductivity measurements and ab initio calculations. This ability to control multiple ion types, multiple phase transitions and electronicmore » conductivity that spans metallic through to insulating behaviour in oxides by electrical means provides a new framework for tuning thermal transport over a wide range.« less

Authors:

Lu, Qiyang  ^[1];

• Search DOE PAGES for author "Lu, Qiyang"
• Search DOE PAGES for ORCID "0000-0002-9155-3684"

Huberman, Samuel  ^[2];

• Search DOE PAGES for author "Huberman, Samuel"
• Search DOE PAGES for ORCID "0000-0003-0865-8096"

Zhang, Hantao ^[3]; Song, Qichen  ^[4];

• Search DOE PAGES for author "Song, Qichen"
• Search DOE PAGES for ORCID "0000-0002-1090-4068"

Wang, Jiayue  ^[3];

• Search DOE PAGES for author "Wang, Jiayue"
• Search DOE PAGES for ORCID "0000-0002-2027-3634"

Vardar, Gulin ^[3]; Hunt, Adrian ^[5]; Waluyo, Iradwikanari ^[5]; Chen, Gang  ^[2];

• Search DOE PAGES for author "Chen, Gang"
• Search DOE PAGES for ORCID "0000-0002-3968-8530"

Yildiz, Bilge  ^[6]

• Search DOE PAGES for author "Yildiz, Bilge"
• Search DOE PAGES for ORCID "0000-0002-2688-5666"

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+ Show Author Affiliations

1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Materials Science and Engineering, and Lab. for Electrochemical Interfaces
2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Materials Science and Engineering
3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Nuclear Science and Engineering, and Lab. for Electrochemical Interfaces
4. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Nuclear Science and Engineering
5. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
6. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Materials Science and Engineering, Dept. of Nuclear Science and Engineering, and Lab. for Electrochemical Interfaces

Publication Date:

Mon Feb 24 00:00:00 EST 2020

Research Org.:

Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:

1615584

Report Number(s):

BNL-213857-2020-JAAM
Journal ID: ISSN 1476-1122

Grant/Contract Number:  

SC0012704

Resource Type:

Accepted Manuscript

Journal Name:

Nature Materials

Additional Journal Information:

Journal Volume: 19; Journal Issue: 6; Journal ID: ISSN 1476-1122

Publisher:

Springer Nature - Nature Publishing Group

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE