Photoelectrochemical characterization of dual-layered anodic TiO<sub>2</sub>nanotubes with honeycomb morphology

Sitler, Steven J.; Raja, Krishnan S.; Karmiol, Zachary; Chidambaram, Dev

doi:10.1088/1361-6463/50/3/035502

Cited by 5 publications

(3 citation statements)

References 35 publications

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“…The researchers also attributed the enhanced OER performance to the oxidation of the surface from Co 3+ to Co 4+ . Thus, comprehensive investigation of surface structure–activity relationships for OER and ORR is crucial for the continuous improvement of future catalyst design for efficient bifunctional oxygen electrodes, in which the surface‐sensitive nature of the oxygen electrode reactions and the engineering of morphologies and design of nanostructures such as nanoflower, honeycomb, needle‐like, nanowire array, and dendrimer structures can significantly influence the site activity and site population of catalysts.…”

Section: Approaches To Enhancing the Activitymentioning

confidence: 99%

A review of transition metal‐based bifunctional oxygen electrocatalysts

Ibrahim

Tsai

Chala

et al. 2019

J Chinese Chemical Soc

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Electrochemical energy storage and conversion devices play a key role in the development of clean, sustainable, and efficient energy systems to meet the sustainable growth of our society. However, challenging issues including the sluggish kinetics of oxygen electrode reactions involving the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) are present, limiting the implementation of devices such as metal‐air batteries, water electrolyzers, and regenerative fuel cells. In this review, various monometallic and bimetallic transition metal oxides (TMOs) and hydroxides are summarized in terms of their application for ORR/OER, in which the merits and demerits of various precious metal and carbon‐based metal oxide materials are discussed, with requirements for better electrocatalysts and catalyst support being introduced as well. Following this, different approaches to improve catalytic activity such as the introduction of doping and defects, the manipulation of crystal facets, and the engineering of supports, compositions, and morphologies are summarized in which TMOs with improved ORR/OER catalytic activities can be synthesized, further improving the speed, stability, and polarization of electrochemical energy storage and conversion devices. Finally, perspectives into the improvement of performance and the better understanding of ORR/OER mechanisms for bifunctional electrocatalysts using in situ spectroscopic techniques and density functional theory calculations are also discussed.

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Section: Approaches To Enhancing the Activitymentioning

confidence: 99%

A review of transition metal‐based bifunctional oxygen electrocatalysts

Ibrahim

Tsai

Chala

et al. 2019

J Chinese Chemical Soc

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“…For this reason, TiO 2 nanotubes prepared in aqueous solution are much preferred. However, the possibility of using potential shock under other conditions has been suggested, as techniques to remove the nanograss that gradually develops during anodization have been reported [64][65][66].…”

Section: Doping Via Thermal Treatmentmentioning

confidence: 99%

Catalyst-Doped Anodic TiO2 Nanotubes: Binder-Free Electrodes for (Photo)Electrochemical Reactions

Yoo

Kim

et al. 2018

Catalysts

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Nanotubes of the transition metal oxide, TiO2, prepared by electrochemical anodization have been investigated and utilized in many fields because of their specific physical and chemical properties. However, the usage of bare anodic TiO2 nanotubes in (photo)electrochemical reactions is limited by their higher charge transfer resistance and higher bandgaps than those of semiconductor or metal catalysts. In this review, we describe several techniques for doping TiO2 nanotubes with suitable catalysts or active materials to overcome the insulating properties of TiO2 and enhance its charge transfer reaction, and we suggest anodization parameters for the formation of TiO2 nanotubes. We then focus on the (photo)electrochemistry and photocatalysis-related applications of catalyst-doped anodic TiO2 nanotubes grown on Ti foil, including water electrolysis, photocatalysis, and solar cells. We also discuss key examples of the effects of doping and the resulting improvements in the efficiency of doped TiO2 electrodes for the desired (photo)electrochemical reactions.

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“…At the negative potential (< E fb ) both electrodes exhibited the same behavior with currents that were low and indistinguishable. Although TiO 2 and WO 3 electrodes typically generate high anodic currents when exposed to UV-Vis radiation, an applied potential of −0.5 V was clearly insufficient to promote charge excitation and, therefore, the separation of the photogenerated charges has not been begun [35][36]. However, when the electrodes were exposed to a potential of + 1.50 V (> E fb ) the photoactivities increased instantaneously.…”

Section: Morphology Composition and Activity Of Electrodes Modified mentioning

confidence: 99%

Enhanced photoelectrocatalytic performance of TiO2 nanotube array modified with WO3 applied to the degradation of the endocrine disruptor propyl paraben

Martins

Nuñez

Lanza

2017

Journal of Electroanalytical Chemistry

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A B S T R A C TWe report on the photoelectrocatalytic degradation of the endocrine disruptor propyl paraben (PPB) using a TiO 2 nanotube (TiO 2 -NT) electrode prepared via chemical anodization, and a TiO 2 -NT electrode modified with WO 3 by electrodeposition. Solutions containing 50 mg L − 1 PPB were subjected to the photoelectrocatalytic process in a 0.2 L one-compartment electrochemical cell under UV/VIS irradiation, and the effects of bias potential (+ 0.5, + 1.0 and +1.5 V) and solution pH (3.0, 7.0 and 10) on the performances of the unmodified and modified electrodes were investigated. Scanning electron micrographs (SEM) showed that the nanotubes were highly organized and perpendicularly aligned with a mean length of 800 nm. According to energy dispersive X-ray and SEM analyses, the concentration of W in the TiO 2 -NT/WO 3 electrode was~0.75% and the distribution of the modifier was continuous and homogeneous on the surface, with pores uncovered and decorated with WO 3 . The photocurrent of the TiO 2 -NT/WO 3 electrode was improved by more than 20% in relation to its unmodified counterpart. The maximum degradation efficiencies were achieved at higher applied potentials and under acidic conditions for both electrodes. However, best results were obtained using the TiO 2 -NT/WO 3 electrode with an applied potential of + 1.50 V and at pH 3. Under these conditions, more than 99% of PPB was removed in 30 min and 94% mineralization was achieved in 60 min. The photoactivity of the electrode was highly stable even after exhaustive application, indicating that WO 3 deposition is an important method for improving the properties of TiO 2 -NT electrodes as applied to organic oxidation.

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Photoelectrochemical characterization of dual-layered anodic TiO₂nanotubes with honeycomb morphology

Cited by 5 publications

References 35 publications

A review of transition metal‐based bifunctional oxygen electrocatalysts

A review of transition metal‐based bifunctional oxygen electrocatalysts

Catalyst-Doped Anodic TiO2 Nanotubes: Binder-Free Electrodes for (Photo)Electrochemical Reactions

Enhanced photoelectrocatalytic performance of TiO2 nanotube array modified with WO3 applied to the degradation of the endocrine disruptor propyl paraben

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Photoelectrochemical characterization of dual-layered anodic TiO2nanotubes with honeycomb morphology

Cited by 5 publications

References 35 publications

A review of transition metal‐based bifunctional oxygen electrocatalysts

A review of transition metal‐based bifunctional oxygen electrocatalysts

Catalyst-Doped Anodic TiO2 Nanotubes: Binder-Free Electrodes for (Photo)Electrochemical Reactions

Enhanced photoelectrocatalytic performance of TiO2 nanotube array modified with WO3 applied to the degradation of the endocrine disruptor propyl paraben

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Photoelectrochemical characterization of dual-layered anodic TiO₂nanotubes with honeycomb morphology