Exceptionally Heavy Doping Boosts the Performance of Iron Silicide for Refractory Thermoelectrics

Qiu Pengfei; Cheng Jun; Chai JunDu XiaolongXia XuguiMing ChenZhu ChenxiYang JiongSun Yi-YangXu FangfangShi XunChen Lidong

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Exceptionally Heavy Doping Boosts the Performance of Iron Silicide for Refractory Thermoelectrics

机译：Exceptionally Heavy Doping Boosts the Performance of Iron Silicide for Refractory Thermoelectrics

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Thermoelectric (TE) power generation is expected to be one of the most effective solutions to convert industrial exhaust heat to electricity for conserving fossil energy and reducing carbon emissions. However, its real application is obstructed decisively by the weakness of the service stability of state-of-the-art TE materials at high temperatures in air. Refractory iron silicide (beta-FeSi2) used to be widely investigated as TE materials, but the low zT has restricted its practical application and even made it almost vanish from TE research in recent years. Here, guided by theoretical calculation, ultrahigh solubility of Ir on the Fe sites of beta-FeSi2 is successfully realized. Doping 16% Ir elicits multi-valley electrical conduction and phonon-electron scattering, doubling the previous zT record of beta-FeSi2 to approximate to 0.6 at 1000 K. The TE properties of the obtained beta-FeSi2 are practically unchanged after thermal aging in air at 1173 K. The new conceptual electrode-less beta-FeSi2-based refractory module demonstrates considerable power density and stable power generation when it is burned by a gas flame in air. These results mark a step toward developing practical TE power generation technology for the recovery of industrial waste heat.

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来源
《Advanced energy materials》 |2022年第18期|2200247.1-2200247.9|共9页
作者
Qiu Pengfei; Cheng Jun; Chai JunDu XiaolongXia XuguiMing ChenZhu ChenxiYang JiongSun Yi-YangXu FangfangShi XunChen Lidong;
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Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China|Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China;

Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China;

Shanghai Univ, Mat Genome Inst, Shanghai 200444, Peoples R ChinaUniv Chinese Acad Sci, Hangzhou Inst Adv Study, Sch Chem & Mat Sci, Hangzhou 310024, Zhejiang, Peoples R China|Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China;

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正文语种英语
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b-FeSi; (2); defect formation energy; industrial kiln; refractory thermoelectrics;

Exceptionally Heavy Doping Boosts the Performance of Iron Silicide for Refractory Thermoelectrics

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