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Title: Harvesting Mechanical and Thermal Energy by Combining ZnO Nanowires and NiTi Shape Memory Alloy

In the expanding world of small scale energy harvesting, the ability to combine thermal and mechanical harvesting is growing ever more important. Here, we demonstrate the feasibility of using ZnO nanowires to harvest both mechanical and low-quality thermal energy in simple, scalable devices. These devices were fabricated on kapton films and used ZnO nanowires with the same growth direction to assure alignment of the piezoelectric potentials of all of the wires. Mechanical harvesting from these devices was demonstrated using a periodic application of force, modeling the motion of the human body. Tapping the device from the top of the device with a wood stick, for example yielded an Open Circuit Voltage (OCV) of 0.2 - 4 V, which is in an ideal range for device applications. In order to demonstrate thermal harvesting from low quality heat sources, a commercially available Nitinol (Ni-Ti alloy) foil was attached to the nanowire piezoelectric device to create a compound thermoelectric. When bent at room temperature and then heated to 50°C, the Nitinol foil was restored to its original flat shape, which yielded an output voltage of nearly 1 V from the ZnO nanowire device.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [3] ;  [4] ;  [1] ;  [4] ;  [2]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Materials Science Division; Univ. of California, Davis, CA (United States). Dept. of Physics
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Materials Science Division
  3. Univ. of California, Davis, CA (United States). Dept. of Physics
  4. Univ. of California, Santa Cruz, CA (United States). Chemistry and Biochemistry Dept.
Publication Date:
Report Number(s):
LLNL-JRNL-725102
Journal ID: ISSN 2559-138X
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Advanced Nanomaterials and Techologies for Energy Sector
Additional Journal Information:
Journal Volume: 1; Journal Issue: 1; Journal ID: ISSN 2559-138X
Publisher:
SciEdTech
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; nanowires; compound thermoelectronics; mechanical energy harvesting
OSTI Identifier:
1361593