Piezoelectric power generation of vertically aligned lead-free (K,Na)NbO3 nanorod arrays

Pil Gu Kang, Byung Kil Yun, Kil Dong Sung, Tae Kwon Lee, Minbaek Lee, Nuri Lee, Seol Hee Oh, William Jo, Hae Jin Seog, Chang Won Ahn, Ill Won Kim, Jong Hoon Jung

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


We report piezoelectric power generation at room temperature, as well as at elevated temperature, using vertically aligned lead-free (K,Na)NbO3 nanorod arrays on a conducting substrate. Ferroelectric (K0.6Na 0.4)NbO3 nanorod arrays having a high piezoelectric coefficient of ca. 180 pm V-1 were epitaxially grown on a conducting SrRuO3/SrTiO3 substrate via the facile hydrothermal method at low temperature (ca. 190 °C). After electric poling, the (K,Na)NbO 3 nanorod array-based nanogenerator generated a stable high power density of ∼101 μW cm-3 at 20 °C, almost 16 times greater than a BaTiO3 nanowire-based vibrational energy harvester (ca. 6.27 μW cm-3). The (K,Na)NbO3 nanorod array-based nanogenerator exhibited little frequency dependence on external force over a relatively low-frequency range (≤10 Hz) and showed long-term durability even at 100 °C, with a power density of 29 μW cm-3. This work demonstrates the potential of eco-friendly nanogenerators based on (K,Na)NbO3 nanorod arrays for high-output power generation under various environmental conditions.

Original languageEnglish
Pages (from-to)29799-29805
Number of pages7
JournalRSC Advances
Issue number56
StatePublished - 2014


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