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Development of Dual-Nanoarchitecture Photoanodes Based on Microwave-Assisted ZnS(en)0.5 Nanoplates for Photoelectrochemical Hydrogen Generation

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journal contribution
posted on 23.06.2022, 21:14 authored by Ruturaj P. Patil, Mahadeo A. Mahadik, Weon-Sik Chae, Jungho Ryu, Jum Suk Jang
In this study, a microwave-assisted (MW) synthesis approach is used to develop an inorganic–organic ZnS­(en)0.5 nanoplate (NP) on a Zn foil substrate. Morphological studies revealed that the growth of the ZnS­(en)0.5 NP on Zn foil increased with prolonged MW irradiation time. Additionally, X-ray diffraction analysis, fourier transform infrared spectroscopy, and transmission electron microscopy unveiled the structural properties of the inorganic–organic hybrid ZnS­(en)0.5 NP electrode to investigate the morphological evolution and the growth mechanism. Furthermore, the fabricated inorganic–organic ZnS­(en)0.5 NP was exposed to Cd2+-ion exchange at different temperatures (140, 160, and 180 °C for 6 h) to improve its light absorption and photoelectrochemical properties. The Zn1–xCdxS porous nanoplate (PNP)/ZnO nanorod (NR)­160 photoanode (160 °C for 6 h) exhibited a high photocurrent density of 4.81 mA·cm–2 at 0.5 V vs RHE. The optimized photoanode also yielded a hydrogen evolution rate of 89.76 μmol·cm–2 under 3 h of solar light illumination. Thus, the formation of the Zn1–xCdxS porous structure and the growth of the ZnO NR during Cd2+-ion exchange enhanced the photocurrent density and, consequently, prolonged the recombination lifespan of the Zn1–xCdxS PNP/ZnO NR160 photoanode.