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231225s2020 xx |||||o 00| ||eng c |
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|a 10.1002/adma.202003730
|2 doi
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|a pubmed25n1048.xml
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|a (DE-627)NLM314486046
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|a (NLM)32875625
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Yang, Dongwang
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Blocking Ion Migration Stabilizes the High Thermoelectric Performance in Cu2 Se Composites
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|c 2020
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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| 338 |
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Revised 07.10.2020
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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| 520 |
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|a © 2020 Wiley-VCH GmbH.
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|a The applications of mixed ionic-electronic conductors are limited due to phase instability under a high direct current and large temperature difference. Here, it is shown that Cu2 Se is stabilized through regulating the behaviors of Cu+ ions and electrons in a Schottky heterojunction between the Cu2 Se host matrix and in-situ-formed BiCuSeO nanoparticles. The accumulation of Cu+ ions via an ionic capacitive effect at the Schottky junction under the direct current modifies the space-charge distribution in the electric double layer, which blocks the long-range migration of Cu+ and produces a drastic reduction of Cu+ ion migration by nearly two orders of magnitude. Moreover, this heterojunction impedes electrons transferring from BiCuSeO to Cu2 Se, obstructing the reduction reaction of Cu+ into Cu metal at the interface and hence stabilizes the β-Cu2 Se phase. Furthermore, incorporation of BiCuSeO in Cu2 Se optimizes the carrier concentration and intensifies phonon scattering, contributing to the peak figure of merit ZT value of ≈2.7 at 973 K and high average ZT value of ≈1.5 between 400 and 973 K for the Cu2 Se/BiCuSeO composites. This discovery provides a new avenue for stabilizing mixed ionic-electronic conduction thermoelectrics, and gives fresh insights into controlling ion migration in these ionic-transport-dominated materials
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|a Journal Article
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|a Cu2Se
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4 |
|a Schottky junction
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4 |
|a mixed ionic-electronic conductors
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|a stable thermoelectric materials
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| 650 |
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|a thermoelectric properties
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| 700 |
1 |
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|a Su, Xianli
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Li, Jun
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Bai, Hui
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Wang, Shanyu
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Li, Zhi
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Tang, Hao
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Tang, Kechen
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Luo, Tingting
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Yan, Yonggao
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Wu, Jinsong
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Yang, Jihui
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Zhang, Qingjie
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Uher, Ctirad
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Kanatzidis, Mercouri G
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Tang, Xinfeng
|e verfasserin
|4 aut
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| 773 |
0 |
8 |
|i Enthalten in
|t Advanced materials (Deerfield Beach, Fla.)
|d 1998
|g 32(2020), 40 vom: 30. Okt., Seite e2003730
|w (DE-627)NLM098206397
|x 1521-4095
|7 nnas
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| 773 |
1 |
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|g volume:32
|g year:2020
|g number:40
|g day:30
|g month:10
|g pages:e2003730
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| 856 |
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|u http://dx.doi.org/10.1002/adma.202003730
|3 Volltext
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