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Reactive Templated Grain Growth and Thermoelectric Power Factor Enhancement of Textured CuFeO2 Ceramics
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-01-16 00:00:00 , DOI: 10.1021/acsaem.9b02407 Masahiko Tato 1 , Rina Shimonishi 1 , Manabu Hagiwara 1 , Shinobu Fujihara 1
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-01-16 00:00:00 , DOI: 10.1021/acsaem.9b02407 Masahiko Tato 1 , Rina Shimonishi 1 , Manabu Hagiwara 1 , Shinobu Fujihara 1
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The delafossite-type CuFeO2 (CFO) is a promising p-type thermoelectric oxide reported to show a large Seebeck coefficient, but the lack of a texturing method for CFO ceramics limits their thermoelectric performance. Here, we show that textured CFO ceramics with an enhanced thermoelectric power factor can be obtained by a facile process based on the reactive templated grain growth (RTGG) method. Nanorods of α-FeOOH were synthesized by a hydrothermal reaction and used as templates for the RTGG process. Textured CFO ceramics with a high c-axis orientation were obtained by ordinal uniaxial pressing of a mixed powder of the α-FeOOH nanorods and Cu2O particles and subsequent reaction sintering process. The best CFO ceramic with the highest orientation degree (Lotgering factor) of 0.71 was obtained at a sintering temperature of 1020 °C. It was found that textured CFO ceramics were formed through a topotactic conversion process via an intermediate α-Fe2O3 phase. The textured CFO ceramic showed a high in-plane electrical conductivity, leading to an enhanced thermoelectric power factor of 1.4 × 10–4 W m–1 K–2 at 700 K, which is the highest value ever reported for undoped CFO ceramics.
中文翻译：
活性CuFeO 2陶瓷的模板化晶粒生长和热电功率因数增强
铜铁矿型CuFeO 2（CFO）是一种很有前途的p型热电氧化物，据报道它具有很大的塞贝克系数，但是缺少CFO陶瓷的纹理化方法会限制其热电性能。在这里，我们表明可以通过基于反应性模板晶粒生长（RTGG）方法的简便方法获得具有增强的热电功率因数的纹理化CFO陶瓷。通过水热反应合成了α-FeOOH纳米棒，并将其用作RTGG工艺的模板。通过有序单轴挤压α-FeOOH纳米棒和Cu 2的混合粉末，可以得到具有高c轴取向的CFO陶瓷纹理。O颗粒和随后的反应烧结过程。在1020°C的烧结温度下获得了具有最高取向度（Lotgering系数）为0.71的最佳CFO陶瓷。据发现，纹理化CFO陶瓷是通过一个局部规整转换处理经由中间的α-Fe形成的2 ö 3相。纹理化的CFO陶瓷显示出较高的面内导电性，从而在700 K时提高了1.4×10 –4 W m –1 K –2的热电功率因数，这是有史以来未掺杂CFO陶瓷的最高值。
更新日期：2020-01-16
中文翻译：
活性CuFeO 2陶瓷的模板化晶粒生长和热电功率因数增强
铜铁矿型CuFeO 2（CFO）是一种很有前途的p型热电氧化物，据报道它具有很大的塞贝克系数，但是缺少CFO陶瓷的纹理化方法会限制其热电性能。在这里，我们表明可以通过基于反应性模板晶粒生长（RTGG）方法的简便方法获得具有增强的热电功率因数的纹理化CFO陶瓷。通过水热反应合成了α-FeOOH纳米棒，并将其用作RTGG工艺的模板。通过有序单轴挤压α-FeOOH纳米棒和Cu 2的混合粉末，可以得到具有高c轴取向的CFO陶瓷纹理。O颗粒和随后的反应烧结过程。在1020°C的烧结温度下获得了具有最高取向度（Lotgering系数）为0.71的最佳CFO陶瓷。据发现，纹理化CFO陶瓷是通过一个局部规整转换处理经由中间的α-Fe形成的2 ö 3相。纹理化的CFO陶瓷显示出较高的面内导电性，从而在700 K时提高了1.4×10 –4 W m –1 K –2的热电功率因数，这是有史以来未掺杂CFO陶瓷的最高值。
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