期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 48, 期 20, 页码 7361-7373出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2022.11.098
关键词
Ni-doped TiO2; Inorganic/organic nano-heterostructures; Photoelectrochemical urea; oxidation; Energy; Environmental
To address global energy crises and environmental threats, researchers have developed an inorganic/organic nano-heterostructure as a photoanode for urea oxidation. This heterostructured photoanode demonstrates excellent urea oxidation efficiency driven by visible light. The hybrid photoanode exhibits high photostability, good solar-to-hydrogen conversion efficiency, and high faradaic efficiency for urea oxidation.
To overcome the global challenges of energy crises and environmental threats, urea oxidation is a hopeful route to utilize urea-rich wastewater as an energy source for hydrogen production. Herein, we report an inorganic/organic type of nano-heterostructure (NHseNi-TiO2/p-NDIHBT) as a photoanode with excellent urea oxidation efficiency driven by visible light. This heterostructured photoanode consists of nickel (Ni)-doped TiO2 nanorods (NRs) arrays as an inorganic part and a D-A-D type organic polymer i.e p-NDIHBT as an organic part. The as-prepared photoanode was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The morphological studies of TEM confirm the coating of p-NDIHBT on NieTiO(2) NPs (similar to 1 mm). The consequence of heterostructure formation on optical and photo-electrochemical (PEC) properties of photoanode were explored through photo-electrochemical responses under visible light irradiation. The photoelectrochemical activity of NieTiO(2) and NieTiO(2)/p-NDIHBT photoanode from linear sweep voltammetry (LSV) shows the ultrahigh photocurrent density of 0.36 mA/cm(2) and 2.21 mA/cm(2), respectively measured at 1.965 V-RHE. Electrochemical impedance spectroscopy (EIS) of both photoanodes shows a highly sensitive nature toward the urea oxidation reaction. The hybrid photoanode also exhibits high photostability, good solar-to-hydrogen conversion efficiency, and high faradaic efficiency for urea oxidation. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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