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An alternative, faster and simpler method for the formation of hierarchically porous ZnO particles and their thermoelectric performance

机译:一种替代,更快,更简单的方法,用于形成多层多孔ZnO颗粒及其热电性能

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We devised an alternative, faster and simple method to prepare hierarchically nanoporous ZnO powders (NZnO) via a quick interfacial reaction (double emulsion) from the mixtures of zinc nitrate hexahydrate (solution, Zn(NO3)2·6H2O), n-hexane (C6H14), ammonium bicarbonate (NH4HCO3), Tween 80 (C64H124O26) and Span 80 (C24H44O6), which was calcined at 450 °C. Due to the microanopore structures, the obtained NZnO powders had a larger surface area (~69.7 m2 g?1) than the commercial ZnO powders. For the thermoelectric evaluation, the textured NZnO pellets (T-NZnOP) were prepared by low pressure spark plasma sintering (SPS) using the newly synthesized NZnO powders (NZnO). In this study, the synthesized NZnO powders that were made into T-NZnOP (sample pellets) showed a significantly lower thermal conductivity with distinctive electrical properties when compared to the bulk commercial ZnO powders. The thermoelectric enhancement can be attributed to the nanopore distribution found in the porous T-NZnOP material which demonstrates the potential usefulness of this method for other porous oxide thermoelectric (TE) materials.
机译:我们设计了一种替代,更快,更简单的方法,可通过六水合硝酸锌(溶液中的Zn(NO )混合物的快速界面反应(双重乳液) 制备分层纳米多孔ZnO粉 3 2 ·6H 2 O), n -己烷(C​​ 6 H 14 ),碳酸氢铵(NH 4 HCO 3 ),吐温80(C 64 H 124 O 26 )和跨度80(C 24 H 44 O 6 ),在450°C下煅烧。由于具有微孔/纳米孔结构,所得到的NZnO粉末具有较大的表面积(〜69.7 m 2 g ?1 < / small>)。为了进行热电评估,使用新合成的NZnO粉末(NZnO)通过低压火花等离子体烧结(SPS)制备了织构化的NZnO颗粒(T-NZnOP)。在这项研究中,与块状商用ZnO粉末相比,制成T-NZnOP(样品颗粒)的合成NZnO粉末显示出明显更低的热导率和独特的电性能。热电增强可以归因于在多孔T-NZnOP材料中发现的纳米孔分布,这证明了该方法对其他多孔氧化物热电(TE)材料的潜在有用性。

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