We demonstrate that the photoactivity of bismuth oxyiodide (BiOI) nanoflake (NF) photocathodes in photo-electrochemical (PEC) water splitting can be significantly enhanced by about 24-fold by thermal calcination under an air atmosphere and then surficial decoration of Au nanoparticles (NPs). To understand the key factors affecting the PEC efficiency in Au NP-decorated BiOI NF photoelectrodes, incident photon-to-current conversion efficiency, electrochemical impedance spectroscopy, photovoltage, and electrochemically active surface area measurements were performed. The analytic results presented that thermal calcining could produce mesopores, increasing active sites on the surface of BiOI NFs. In addition, the synergistic effects of surface-state passivation and charge separation were observed for the surficial Au NP decoration on BiOI NFs. Transient absorption spectroscopy coupled with PEC measurements confirmed that the lifetime of photogenerated electrons on the conduction band of BiOI NFs can be prolonged by Au NP decoration, resulting in higher probability to carry out water reduction. The current investigation presents important insights into the mechanism of charge carrier dynamics in metal-semiconductor nano-heterostructures, which is contributive to develop photoelectrode materials in solar fuel production.
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http://dx.doi.org/10.1021/acsami.0c18430 | DOI Listing |
ACS Appl Mater Interfaces
February 2021
Department of Materials Science, National University of Tainan, Tainan 70005, Taiwan.
We demonstrate that the photoactivity of bismuth oxyiodide (BiOI) nanoflake (NF) photocathodes in photo-electrochemical (PEC) water splitting can be significantly enhanced by about 24-fold by thermal calcination under an air atmosphere and then surficial decoration of Au nanoparticles (NPs). To understand the key factors affecting the PEC efficiency in Au NP-decorated BiOI NF photoelectrodes, incident photon-to-current conversion efficiency, electrochemical impedance spectroscopy, photovoltage, and electrochemically active surface area measurements were performed. The analytic results presented that thermal calcining could produce mesopores, increasing active sites on the surface of BiOI NFs.
View Article and Find Full Text PDFJ Hazard Mater
May 2021
Institute of Environmental Science, College of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, Shanxi 030006, PR China. Electronic address:
In this work, a visible-light-driven photoelectrochemical (PEC) sensing platform was developed based on BiOI nanoflowers/TiO nanotubes (BiOI NFs/TiO NTs) for detection of atrazine (ATZ). The BiOI NFs/TiO NTs p-n heterojunctions synthesized by decorating BiOI NFs on TiO NTs via simple hydrothermal approach exhibit strong visible-light absorption ability, high photocurrent response and PEC activity. Thus BiOI NFs/TiO NTs heterostructures were first explored to act as the photoelectrode for the immobilization of the anti-ATZ aptamer to develop a PEC sensing platform.
View Article and Find Full Text PDFAnal Chim Acta
January 2021
State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China. Electronic address:
Herein, we describe a customized approach for facile preparation of three-dimensional (3D) NiO nanoflakes (NFs)/carbon fiber meshwork (CFM) and its validation as a common photocathode matrix for photoelectrochemical (PEC) bioanalysis, which to our knowledge has not been reported. Specifically, 3D NiO NFs/CFM was fabricated by a sequential liquid phase deposition and annealing process, which was then characterized by scanning electron microscopy, X-ray photoelectron spectrum, UV-vis absorption spectra and N adsorption-desorption measurement. Sensitized by BiOI and incorporated with an alkaline phosphatase (ALP)/tyrosinase (TYR) bi-enzyme cascade system, a sensitive split-type cathodic PEC bioanalysis for the determination of ALP was achieved.
View Article and Find Full Text PDFNanoscale Adv
November 2019
Key Laboratory of Interfacial Reaction & Sensing Analysis in Universities of Shandong, University of Jinan Jinan 250022 PR China +86-531-82767872.
In this work, we demonstrate that zero-dimensional Au nanoparticles (0D Au NPs)-decorated three-dimensional bismuth oxyiodide (BiOI) nanoflower (3D BiOI NFs)/two-dimensional nickel oxide (NiO) nanosheet array (2D NiO NSAs) hybrid nanostructures can be used as a self-powered cathodic photoelectrochemical (PEC) biosensing platform. The formation of 3D BiOI NFs on 2D NiO NSAs was carried out by a chemical bath deposition method, while 0D Au NPs were coated on 3D BiOI NFs/2D NiO NSAs through a dip-coating method. Subsequently, glucose oxidase (GOD) as an enzyme model was immobilized on the surface of a Au@BiOI/NiO electrode the adhesion of poly-(diallyldimethylammonium chloride) (PDDA).
View Article and Find Full Text PDFInorg Chem
July 2019
Key Lab of Applied Chemistry of Zhejiang Province, Department of Chemistry , Zhejiang University, Hangzhou , China.
Heterostructural engineering and three-dimensional architecture construction are effective strategies to optimize the photocatalytic performance of semiconductors. Herein, we integrate these two strategies and controllably synthesize ZnO-BiOI heterostructures with well-defined architectures. Microstructural and surface analysis reveals that the strong electronic interaction between ZnO and Bi ensures a bounded nucleation and growth of BiOI on the surface of ZnO, which leads to the formation of ZnO-BiOI nanorod heterostructures (ZnO-BiOI-NR) with very high dispersion of BiOI on ZnO nanorods.
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