Preparation of BaTiO3/low melting glass core–shell nanoparticles for energy storage capacitor applications
Preparation of BaTiO3/low melting glass core–shell nanoparticles for energy storage capacitor applications
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DOI：
10.1039/c4ta04282d
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发表时间：
2014-10
影响因子：
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通讯作者：
Xiaofeng Su;Brian C. Riggs;M. Tomozawa;J. Nelson;D. Chrisey
中科院分区：
文献类型：
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作者：
Xiaofeng Su;Brian C. Riggs;M. Tomozawa;J. Nelson;D. Chrisey
采用核-壳纳米混合技术制备BaTiO 3/玻璃纳米复合材料，以保持烧结后BaTiO 3的纳米晶粒介电性能，提高复合材料的储能能力。采用溶胶-沉淀法在超声搅拌下，在BaTiO 3纳米粒子表面制备了铅硼硅酸盐玻璃（65 PbO-20 B2 O3 - 15 SiO2，mol%）和铋硼硅酸盐玻璃（65 Bi 2 O3 - 20 B2 O3 - 15 SiO2，mol%）的低熔点玻璃涂层。透射电子显微镜（TEM）的结果证实了形成的核壳纳米结构与可控的壳厚度在2和18 nm之间。X射线衍射（XRD）图显示从玻璃涂层中没有检测到结晶峰。傅里叶变换红外光谱（FT-IR）表明，分别铅硼硅酸盐玻璃和铋硼硅酸盐玻璃的玻璃网络结构。通过在低温（≤900 °C）下烧结，两种复合材料都实现了高致密化。观察到的铅硼硅酸盐玻璃涂覆的钛酸钡（Pb-BT）复合材料，而几乎没有观察到的铋硼硅酸盐玻璃涂覆的钛酸钡（Bi-BT）纳米复合材料的晶粒生长。这种差异是由于在烧结过程中的钛酸钡核心和两个玻璃之间的不同的相互作用，所揭示的XRD研究。研究了Bi-BT纳米复合材料的介电性能和储能性能。Bi-BT纳米复合材料表现出高极化、高介电击穿强度（≥1000 kV cm−1）、延迟的极化饱和和低剩余极化，在1000 kV cm−1下放电能量密度为1000 J cm−3。因此，Bi-BT核-壳纳米复合材料似乎是一种有前途的储能电容器应用的材料系统。
A core–shell nano-scale mixing technique was applied to fabricate BaTiO3/glass nanocomposites in order to preserve the nano-grain dielectric properties of BaTiO3 after sintering and enhance the bulk composite energy storage capability. Coating layers of low melting glasses of lead borosilicate glass (65PbO–20B2O3–15SiO2, mol%) and bismuth borosilicate glass (65Bi2O3–20B2O3–15SiO2, mol%) were deposited onto BaTiO3 nanoparticles in chemical solution by a sol-precipitation method under ultrasonic agitation. Transmission electron microscopy (TEM) results confirmed the formation of core–shell nanostructures with controllable shell thicknesses between 2 and 18 nm. X-ray diffraction (XRD) patterns showed that no crystalline peaks were detected from the glass coating layer. Fourier transform infrared (FT-IR) spectra indicated a glass network structure of lead borosilicate glass and bismuth borosilicate glass, respectively. High densifications were achieved for both composites by sintering at low temperatures (≤900 °C). Noticeable grain growth was observed for the lead borosilicate glass-coated BaTiO3 (Pb-BT) composite while almost no grain growth was observed for the bismuth borosilicate glass-coated BaTiO3 (Bi-BT) nanocomposite. This disparity was attributed to the different interactions between the BaTiO3 core and two glasses during the sintering process, as revealed by the XRD study. Dielectric properties and energy storage capability of the Bi-BT nanocomposite were investigated in detail. The Bi-BT nanocomposite showed high polarization, high dielectric breakdown strength (≥1000 kV cm−1), postponed polarization saturation, and low remnant polarization with the discharge energy density of ∼10 J cm−3 at 1000 kV cm−1. Thus, the Bi-BT core–shell nanocomposite appears to be a promising material system for energy storage capacitor applications.