Photoelectrochemical Water Splitting and H 2 Generation Enhancement Using an Effective Surface Modification of W-Doped TiO 2 Nanotubes (WT) with Co-Deposition of Transition Metal Ions

Tecush Mohammadi (), Somayeh Sharifi, Yousef Ghayeb, Tayebeh Sharifi () and Mohamad Mohsen Momeni
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Tecush Mohammadi: Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran
Somayeh Sharifi: Department of Chemistry, Bu-Ali Sina University, Hamedan 65167-38695, Iran
Yousef Ghayeb: Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran
Tayebeh Sharifi: Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran
Mohamad Mohsen Momeni: Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran

Sustainability, 2022, vol. 14, issue 20, 1-12

Abstract: W-doped TiO 2 nanotube arrays (WT) were fabricated by in situ electrochemical anodization of titanium substrate. The results of the influence of different photo-deposited transition ions (Cr x Fe 1−x , 0 ≤ x ≤ 1) on the surface of WT on photoelectrochemical (PEC) water splitting and H 2 generation are presented. The crystallinities, structural, elemental, and absorption analysis were conducted by XRD, SEM, RAMAN, EDX, and UV–Vis absorption spectroscopy, which demonstrated anatase as the main crystalline phase of TiO 2 , and the existence of Cr x Fe 1−x (nano)particles/film deposited on the surface of WT. The SEM images revealed that the deposition rate and morphology are highly related to the ratio of Cr and Fe ions. Under visible light illumination, the entire photoelectrodes showed a very good response to light with stable photocurrent density. PEC measurements revealed that the mixture of transition ions with a certain ratio of ions (Cr 0.8 Fe 0.2 –T) led to enhanced photocurrent density more than that of other modifiers due to decreasing charge recombination as well as improving the charge transfer. Moreover, PEC water splitting was conducted in an alkaline solution and the Cr 0.8 Fe 0.2 –T photoelectrode generated 0.85 mL cm −2 h −1 H 2 , which is over two times that of pristine WT.

Keywords: TiO 2 nanotubes; in situ electrochemical anodization; transition metals; hydrogen; water splitting (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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