Abstract
Self-powered broad-band electrochemical photodetectors (ECPDs) based on broadband photoresponse nanostructured composites are a low-cost and promising photoelectrochemical (PEC) device. In this work a TiO 2 nanorod array (TNRA) structure modified by the ZrO 2 nanoparticles and metallic single-walled carbon nanotubes (m-SWCNTs) was used to prepare the ECPDs for enabling a high performance ultraviolet-visible (UV-VIS) photoresponse. The ECPDs exhibit a high optical sensitivity with an on/off ratio of 1.59 × 10 5 and an optical responsivity of 158.67 mA/W under ultraviolet radiation (365 nm) without external bias. The lowest detectable intensity of ultraviolet and visible-light irradiance (465 nm) can reach around 0.1 mW/cm 2 and 0.18 mW/cm 2 . The enhanced PEC performance can be attributed to the effective separation and transport of carriers in the PEC system by the type-I band alignment of ZrO 2 @TiO 2 structure and high conductive network of SWCNTs.
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