Polymer-based capacitors with high energy density have attracted significant attention in recent years due to their wide range of potential applications in electronic devices. However, the obtained high energy density is predominantly dependent on high applied electric field, e.g., 400-600 kV mm-1, which may bring more challenges relating to the failure probability. Here, a simple two-step method for synthesizing titanium dioxide/lead zirconate titanate nanowire arrays is exploited and a demonstration of their ability to achieve high discharge energy density capacitors for low operating voltage applications is provided. A high discharge energy density of 6.9 J cm-3 is achieved at low electric fields, i.e., 143 kV mm-1, which is attributed to the high relative permittivity of 218.9 at 1 kHz and high polarization of 23.35 µC cm-2 at this electric field. The discharge energy density obtained in this work is the highest known for a ceramic/polymer nanocomposite at such a low electric field. The novel nanowire arrays used in this work are applicable to a wide range of fields, such as energy harvesting, energy storage, and photocatalysis.

中文翻译：

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使用对齐的二氧化钛/锆钛酸铅纳米线阵列在低电场下实现高放电能量密度。

近年来，具有高能量密度的聚合物电容器因其在电子设备中的广泛潜在应用而引起了人们的广泛关注。然而，获得的高能量密度主要依赖于高施加电场，例如400-600 kV mm-1，这可能带来与故障概率相关的更多挑战。这里，利用了一种简单的两步法来合成二氧化钛/锆钛酸铅纳米线阵列，并证明了它们在低工作电压应用中实现高放电能量密度电容器的能力。在低电场（即 143 kV mm-1）下实现了 6.9 J cm-3 的高放电能量密度，这归因于 1 kHz 时 218.9 的高相对介电常数和 23.35 µC cm-2 的高极化电场。这项工作中获得的放电能量密度是已知陶瓷/聚合物纳米复合材料在如此低电场下的最高放电能量密度。这项工作中使用的新型纳米线阵列适用于能量收集、能量存储和光催化等广泛领域。