Blocking Ion Migration Stabilizes the High Thermoelectric Performance in Cu2Se Composites
dc.contributor.author | Yang, Dongwang | |
dc.contributor.author | Su, Xianli | |
dc.contributor.author | Li, Jun | |
dc.contributor.author | Bai, Hui | |
dc.contributor.author | Wang, Shanyu | |
dc.contributor.author | Li, Zhi | |
dc.contributor.author | Tang, Hao | |
dc.contributor.author | Tang, Kechen | |
dc.contributor.author | Luo, Tingting | |
dc.contributor.author | Yan, Yonggao | |
dc.contributor.author | Wu, Jinsong | |
dc.contributor.author | Yang, Jihui | |
dc.contributor.author | Zhang, Qingjie | |
dc.contributor.author | Uher, Ctirad | |
dc.contributor.author | Kanatzidis, Mercouri G. | |
dc.contributor.author | Tang, Xinfeng | |
dc.date.accessioned | 2020-11-04T16:01:34Z | |
dc.date.available | WITHHELD_12_MONTHS | |
dc.date.available | 2020-11-04T16:01:34Z | |
dc.date.issued | 2020-10 | |
dc.identifier.citation | Yang, Dongwang; Su, Xianli; Li, Jun; Bai, Hui; Wang, Shanyu; Li, Zhi; Tang, Hao; Tang, Kechen; Luo, Tingting; Yan, Yonggao; Wu, Jinsong; Yang, Jihui; Zhang, Qingjie; Uher, Ctirad; Kanatzidis, Mercouri G.; Tang, Xinfeng (2020). "Blocking Ion Migration Stabilizes the High Thermoelectric Performance in Cu2Se Composites." Advanced Materials 32(40): n/a-n/a. | |
dc.identifier.issn | 0935-9648 | |
dc.identifier.issn | 1521-4095 | |
dc.identifier.uri | https://hdl.handle.net/2027.42/163457 | |
dc.description.abstract | 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 Cu2Se is stabilized through regulating the behaviors of Cu+ ions and electrons in a Schottky heterojunction between the Cu2Se 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 Cu2Se, obstructing the reduction reaction of Cu+ into Cu metal at the interface and hence stabilizes the β‐Cu2Se phase. Furthermore, incorporation of BiCuSeO in Cu2Se 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 Cu2Se/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.The space‐charge region between Cu2Se host matrix and in‐situ‐formed BiCuSeO under a direct current causes drastic suppression of the Cu+ ion migration in such composites and obstructs the reduction reaction of Cu+ into Cu metal. This, together with the effective regulation of carrier concentration as well as enhanced interfacial phonon scattering, greatly stabilizes the improved thermoelectric performance. | |
dc.publisher | Wiley Periodicals, Inc. | |
dc.publisher | CRC Press | |
dc.subject.other | Schottky junction | |
dc.subject.other | Cu2Se | |
dc.subject.other | mixed ionic–electronic conductors | |
dc.subject.other | thermoelectric properties | |
dc.subject.other | stable thermoelectric materials | |
dc.title | Blocking Ion Migration Stabilizes the High Thermoelectric Performance in Cu2Se Composites | |
dc.type | Article | |
dc.rights.robots | IndexNoFollow | |
dc.subject.hlbsecondlevel | Engineering (General) | |
dc.subject.hlbsecondlevel | Materials Science and Engineering | |
dc.subject.hlbtoplevel | Engineering | |
dc.description.peerreviewed | Peer Reviewed | |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/163457/2/adma202003730-sup-0001-SuppMat.pdf | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/163457/3/adma202003730_am.pdf | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/163457/1/adma202003730.pdf | en_US |
dc.identifier.doi | 10.1002/adma.202003730 | |
dc.identifier.source | Advanced Materials | |
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dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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