Novel photoanodes based on (Mo-Cr) co-doped titania nanotube for highly efficient photocathodic protection performance of stainless steel

Motalebian, Majid; Momeni, Mohamad Mohsen; Lee, Byeong–Kyu

doi:10.1016/j.apsusc.2022.155091

Cited by 8 publications

(4 citation statements)

References 45 publications

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“…Two peaks of the deconvoluted O 1s spectra in Figure c correspond to lattice oxygen (denoted as O α ) at 529.0–529.3 eV and chemisorbed oxygen (denoted as O β ) at 530.7–531.1 eV . As listed in Table , the ratio of O β /O α in CeO 2 @TiO 2 (0.56) was higher than that in CeTiO x (0.37), indicating that more chemisorbed reactive oxygen species, such as O – or O 2 2– , were present in CeO 2 @TiO 2 to facilitate CO oxidation reactions due to the higher mobility and electrophilicity of O β .…”

Section: Resultsmentioning

confidence: 93%

“…Two peaks of the deconvoluted O 1s spectra in Figure 8c correspond to lattice oxygen (denoted as O α ) at 529.0−529.3 eV and chemisorbed oxygen (denoted as O β ) at 530.7−531.1 eV. 42 As listed in Table 2, the ratio of O β /O α in CeO 2 @TiO 2 (0.56) was higher than that in CeTiO x (0.37), indicating that more chemisorbed reactive oxygen species, such as O − or O 2 2− , were present in CeO 2 @TiO 2 to facilitate CO oxidation reactions due to the higher mobility and electrophilicity of O β . 43 The increases of CeTiO x -S and CeO 2 @TiO 2 -S in the ratio of O β /O α from 0.37 and 0.56 to 0.85 and 0.69 implied more hydroxyl groups or defective oxygen species on the surface of CeTiO x -S and CeO 2 @TiO 2 -S after reacting in the flue gas containing SO 2 .…”

Section: Characterization Of the Fresh And Used Catalystsmentioning

confidence: 99%

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SO₂-Poisoning-Resistant CeO₂@TiO₂ Nanorod with the core–shell Structure for the Catalytic Oxidation of CO

Gao,

Dong,

et al. 2023

J. Phys. Chem. C

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The core−shell-structured CeO 2 @TiO 2 nanorods and traditional CeTiO x nanoparticles were prepared to study the role of the core−shell structure in CO catalytic oxidation and SO 2 resistance. CeO 2 @TiO 2 maintained a higher than 98% CO conversion at 300 °C in the flue gas containing 1000 ppm CO and achieved about 68% CO conversion after adding 500 ppm SO 2 for 5 h. The core−shell structure mitigated the crystallinity loss of the CeO 2 core and pore blockage of CeO 2 @TiO 2 . TiO 2 avoided the reaction between SO 2 and CeO 2 to protect CeO 2 from SO 2 poisoning. In the case of SO 2 passing through the shell, TiO 2 could inhibit the formation of Ce 2 (SO 4 ) 3 , delaying the deactivation of the CeO 2 core. Furthermore, the sulfate deposited on CeO 2 @TiO 2 possessed a smaller amount and poorer thermal stability than that on CeTiO x . The design of the core−shell structure provides an effective route to enhance the SO 2 -poisoning resistance of catalysts in CO oxidation.

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Section: Resultsmentioning

confidence: 93%

Section: Characterization Of the Fresh And Used Catalystsmentioning

confidence: 99%

SO₂-Poisoning-Resistant CeO₂@TiO₂ Nanorod with the core–shell Structure for the Catalytic Oxidation of CO

Gao,

Dong,

et al. 2023

J. Phys. Chem. C

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“…Currently, there are several approaches to improving the PCP performance of TiO 2 coatings. These methods include doping, deposition of noble metals, sensitization, and the preparation of heterojunctions …”

Section: Tio2 Coatingmentioning

confidence: 99%

Review of TiO₂-Based Heterojunction Coatings in Photocathodic Protection

Xu,

Li,

Wen

et al. 2024

ACS Appl. Nano Mater.

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Photocathodic protection coating is an emerging anticorrosion technology that combines the protective characteristics of coating and cathodic protection. TiO 2 is stable and easy to prepare; however, it suffers from a low sunlight utilization rate and low photoelectric conversion efficiency. The construction of TiO 2 -based heterojunction coatings provides an effective solution to these challenges. This work summarizes the synthesis methods of TiO 2based heterojunction coatings, explores the charge-transfer mechanisms associated with various types of heterojunction coatings (e.g., type II heterojunction, p−n junction, Schottky junction, and Z-scheme heterojunction), and reviews the characterization methods used for heterojunction analysis. Finally, the application prospects and future research directions of TiO 2 -based heterojunction coatings are proposed. This study will help researchers understand the fabrication process and application of TiO 2 -based heterojunction coatings in photocathodic protection.

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“…In the equivalent circuit of the Nyquist plots [34,35], R s represents the series resistance, R f refers to the film resistance, R ct is the charge transfer resistance, and CPE 1 and CPE 2 represent the constant phase elements. The constant phase element (CPE) can be expressed by the equation CPE = 1 Y 0 (jw) n , where Y 0 and n represent the admittance magnitude of the CPE and the exponential term (0 < n ≤ 1), respectively; ω is the angular frequency in rad s −1 (ω = 2πf ); and j 2 = −1 is an imaginary number [36,37]. The order of charge transfer resistance for the P-CN, OP-CN, and OP-CN(A) photoelectrodes is as follows: OP-CN(A) (3.20 kΩ) < OP-CN (6.48 kΩ) < P-CN (9.14 kΩ).…”

Section: Photoelectrochemical and Photocathodic Protection Performanc...mentioning

confidence: 99%

Oxidized Graphitic-C3N4 with an Extended π-System for Enhanced Photoelectrochemical Property and Behavior

Chang,

Dai,

Suo

et al. 2023

Crystals

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In this work, an oxidized g-C3N4 film was successfully synthesized using a two-step acid treatment and electrophoretic deposition method. The delocalized π-system of the oxidized g-C3N4 film was extended via an annealing treatment. We investigated the influence of hydrogen bonding reversibility and the oxidation treatment of g-C3N4 on the photoelectrochemical property and photocathodic protection for 304 stainless steel (304 SS). The resulting oxidized g-C3N4 photoelectrode with an extended π-system presents a remarkably enhanced photogenerated electron transfer capability from the photoelectrode to 304 SS (photoinduced OCP negative shift of −0.55 VAgCl) compared with oxidized g-C3N4 and protonated g-C3N4. The oxidation of g-C3N4 facilitates the formation of a porous structure and the introduction of abundant oxygen functional groups, which could promote the effective separation and transport of photogenerated electron–hole pairs. The hydrogen bonding reversibility contributes to the extension of the delocalized π-conjugation system, which could enhance light absorption efficiency. Meanwhile, the annealing treatment is beneficial for prolonging the lifetime of photoelectrons, which could reduce the recombination rate of charge carriers. In addition, to understand how the oxidation treatment and annealing treatment affect the charge transfer behavior, the electronic band structure was investigated, and we found that the oxidized g-C3N4 film with an extended π-system possesses a more negative conduction band position, which could reduce the energy barrier of the photogenerated electron transfer.

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Novel photoanodes based on (Mo-Cr) co-doped titania nanotube for highly efficient photocathodic protection performance of stainless steel

Cited by 8 publications

References 45 publications

SO₂-Poisoning-Resistant CeO₂@TiO₂ Nanorod with the core–shell Structure for the Catalytic Oxidation of CO

SO₂-Poisoning-Resistant CeO₂@TiO₂ Nanorod with the core–shell Structure for the Catalytic Oxidation of CO

Review of TiO₂-Based Heterojunction Coatings in Photocathodic Protection

Oxidized Graphitic-C3N4 with an Extended π-System for Enhanced Photoelectrochemical Property and Behavior

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Novel photoanodes based on (Mo-Cr) co-doped titania nanotube for highly efficient photocathodic protection performance of stainless steel

Cited by 8 publications

References 45 publications

SO2-Poisoning-Resistant CeO2@TiO2 Nanorod with the core–shell Structure for the Catalytic Oxidation of CO

SO2-Poisoning-Resistant CeO2@TiO2 Nanorod with the core–shell Structure for the Catalytic Oxidation of CO

Review of TiO2-Based Heterojunction Coatings in Photocathodic Protection

Oxidized Graphitic-C3N4 with an Extended π-System for Enhanced Photoelectrochemical Property and Behavior

Contact Info

Product

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SO₂-Poisoning-Resistant CeO₂@TiO₂ Nanorod with the core–shell Structure for the Catalytic Oxidation of CO

SO₂-Poisoning-Resistant CeO₂@TiO₂ Nanorod with the core–shell Structure for the Catalytic Oxidation of CO

Review of TiO₂-Based Heterojunction Coatings in Photocathodic Protection