Keggin and Dawson polyoxometalates as electrodes for flexible and transparent piezoelectric nanogenerators to efficiently utilize mechanical energy in the environment

By He, Peng; Chen, Weilin; Li, Jianping; Zhang, Hong; Li, Yunwu; Wang, Enbo
Published in Science Bulletin 2019

Abstract

In recent years, piezoelectric nanogenerators (PENGs) have been developed as a promising energy-harvesting electronic device. However, the electrodes of most PENGs devices are precious metals, thus increasing the production cost. Here, we propose a flexible transparent PENGs with polyoxometalates (POMs) as the electrodes; it can effectively utilize ambient mechanical energy to generate electricity. Five types of polyoxometalates with different structures and compositions are selected as the electrode materials for PENGs for the first time, and the output performance of different PENGs electrode devices is tested. The PENG device with (NH4)6P2Mo18O62 as the electrode can steadily provide a high electric output with an open-circuit voltage of 2.8 mV and a short-circuit current of 8.5

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