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Energy-harvesting enhancement in composites of microwave-exfoliated KNN and multiwall carbon nanotubes

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Abstract

The objective of this research work is to investigate the effect of multiwall carbon nanotube (MWCNT) content (0.3–1.2 wt%) on a potassium sodium niobate (KNN)-based piezoelectric unimorph harvester for enhancing the energy generation capacity. KNN–MWCNT composites were fabricated by using a microwave solid state technique. The energy-harvesting performance of the KNN–MWCNT composite was determined by the base excitation method and sized to resonate between 20 and 100 Hz at 1 \(\hbox {M}\Omega \) load resistance. The energy performance of the KNN composite at percolation threshold (0.6 wt% MWCNT) showed a maximum power generation of \(2.94\, \upmu \hbox {W}\), the power density of 7.15 \(\upmu \hbox {W}\) \(\hbox {m}^{-3}\) and overall efficiency of 83.75% at an input acceleration of 0.5 g and a load resistance of 1 \(\hbox {M}\Omega \). Improvements observed in the power generation by percolation phenomena and ionic flow over the nanotube surface of KNN composites prove to be a boon for low-power sensing devices.

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Acknowledgements

The authors would like to acknowledge the financial support of R.V.C.E., Bangalore under TEQIP-II, Subcomponent 1.2, Characterization facilities support at CENSE Department under INUP, Material Engineering Department at IISC, Bangalore and technical guidance from Dr Rammohan Sriramdas, CENSE Dept., IISC, Bangalore.

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Authors and Affiliations

  1. Department of Mechanical Engineering, BMS Institute of Technology and Management, Bangalore, 560064, India

    Nandini R Nadar & A V Suresh

  2. Research and Development Centre, Department of Mechanical Engineering, R.V. College of Engineering, Bangalore, 560059, India

    M Krishna

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  1. Nandini R Nadar
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  2. M Krishna
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  3. A V Suresh
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Correspondence to M Krishna.

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Nadar, N.R., Krishna, M. & Suresh, A.V. Energy-harvesting enhancement in composites of microwave-exfoliated KNN and multiwall carbon nanotubes. Bull Mater Sci 42, 253 (2019). https://doi.org/10.1007/s12034-019-1938-6

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  • DOI: https://doi.org/10.1007/s12034-019-1938-6

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