Fig. 11. (a) Schematic of the fabrication process of the asymmetric Au-ZnO and the symmetric Au-ZnO nanorod array. (b) Piezo-photocatalytic degradation of RhB with different catalysts, and control sample without catalysts. (c) Summarized histogram of the RhB degradation under different conditions for 75 min. (d) Mechanism of the enhanced catalytic activity induced by piezotronic effect and unique asymmetric nanostructure under light illumination and ultrasound stimulation (, Schottky Barrier; and, the conduction band energy and valence band energy of ZnO, respectively;, energy of the Fermi level). Reproduced from ref. [78] (Copyright 2020, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim).
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