Fundamental study of mechanical energy harvesting using piezoelectric nanostructures
Fundamental study of mechanical energy harvesting using piezoelectric nanostructures
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DOI：
10.1063/1.3462468
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发表时间：
2010-08-01
影响因子：
3.2
通讯作者：
Wang, Xudong
中科院分区：
文献类型：
--
作者：
Sun, Chengliang;Shi, Jian;Wang, Xudong
本文数值计算了压电纳米结构的势能、输出功率和能量转换效率，包括矩形纳米线、六边形纳米线和二维垂直薄膜（纳米鳍）。静态分析研究了当BaTiO 3 NW、ZnO NW和ZnO纳米鳍受到恒定外力时可以产生的最大压电电势。进行动态分析，以研究发电能力，通过这些纳米结构的振动搅动环境振动能量。选择ZnO NW和纳米鳍作为两种代表性的纳米发电机元件。它们的动态响应采用具有一系列阻尼比的单自由度系统建模。结合机械振动和压电电荷产生的传递函数，我们定义了输出功率和效率作为振动频率和尺寸的函数。提出了构建高效率和高功率纳米发电机的最佳尺寸。基于不同的压电和铁电材料系统，包括ZnO，BaTiO_3，和（1-x）Pb（Mg_（1/3）Nb_（2/3））O_（3-x）PbTiO_（3）），还研究了动力学系统的材料依赖性。本研究揭示了纳米材料的形貌、尺寸和性能与机械能收集能力之间的综合关系。这为高功率纳米发电机的设计和压电纳米器件的开发提供了指导。(C)2010年美国物理学会。[doi：10.1063/1.3462468]
This paper numerically estimates the potential, the output power and the energy conversion efficiency of piezoelectric nanostructures, including rectangular nanowires (NWs), hexagonal NWs, and two-dimensional vertical thin films (the nanofins). Static analysis studies the maximum piezoelectric potential that can be produced by a BaTiO3 NW, a ZnO NW, and a ZnO nanofin when they are subjected to a constant external force. Dynamic analysis is performed to study the power generation ability via the vibration of these nanostructures agitated by ambient vibration energy. ZnO NW and nanofin are selected as two representative nanogenerator elements. Their dynamic responses are modeled using a single-degree of freedom system with a series of damping ratios. Combining the transfer functions of mechanical vibration and piezoelectric charge generation, we define the output power and efficiencies as functions of the vibration frequency and the sizes. The optimal size for constructing a high efficiency and high-power nanogenerator is suggested. The material dependence of a dynamic system is also studied based on different piezoelectric and ferroelectric material systems, including ZnO, BaTiO3, and (1-x) Pb(Mg1/3Nb2/3)O-3-xPbTiO(3). This research reveals a comprehensive relationship between the mechanical energy harvesting ability and the nanomaterials' morphologies, dimensions, and properties. It provides a guideline for the design of high-power nanogenerators and the development of piezoelectric nanodevices in general. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3462468]