g-C3N4/TiO2 hybrid film on the metal surface, a cheap and efficient sunlight active photoelectrochemical anticorrosion coating

De, Ding; Hou, Qiankun; Su, Yaoguo; Li, Qianqian; Liu, Lei; Jiang, Jing; Lin, Bin; Yin, Chuancun

doi:10.1007/s10854-019-01635-z

Cited by 19 publications

(7 citation statements)

References 35 publications

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“…CN materials with the highest potential for the photocatalytic degradation of pollutants were selected for an immobilization approach. In the literature, degradation processes are usually evaluated by means of dispersions of the photocatalyst [13,[39][40][41][42]. Generally, dispersions show significant higher activities than immobilized particles, but to avoid the phase separating process of catalyst particles in an industrial approach, it is essential to establish immobilization methods.…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

Carbon nitride materials: impact of synthetic method on photocatalysis and immobilization for photocatalytic pollutant degradation

Köwitsch

Mehring

2021

J Mater Sci

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Different synthesis routes for carbon nitride materials (CN) and the resulting products were compared to study the photocatalytic activity (pollutant degradation) in dependence on structure and properties. The CN materials were synthesized by thermal decomposition of dicyandiamide in air and under argon as well as in sealed ampoules with or without the use of a salt melt. The as-prepared materials were characterized by IR spectroscopy, nitrogen adsorption measurement, solid-state NMR spectroscopy, diffuse reflectance UV–Vis spectroscopy, elemental analysis and powder X-ray diffraction (PXRD). The surface polarity of the CN materials was estimated by adsorption of the dicyano-bis(1,10-phenanthroline)-iron(II) complex, which allows an evaluation of the degree of condensation. The CN materials were tested with regard to the photocatalytic degradation of rhodamine B (RhB). It is shown that the photocatalytic activity increases with higher surface polarity. Promising CN materials with high RhB degradation of 85% within 25 min and high surface polarity of 0.89 were selected for an immobilization approach to obtain coatings on a silicone substrate using a high-volume low-pressure (HVLP) spray coating technique. To study the photocatalytic activity of the catalyst coatings, the degradation rates of an aqueous RhB solution and solutions of organic pollutants such as triclosan and ethinyl estradiol were examined. Pollutants are decomposed with up to 63% of the initial concentration. Xenon lamps and different LEDs were used as light sources for comparison. Particularly high degradation efficiencies were obtained using LEDs, and the degradation rates are increased by adjusting the emission spectrum of the lamp to the pollutant and absorption edge of the catalyst, which results in a 40 times higher degradation efficiencies of LEDs compared to a Xe lamp. Graphical abstract

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Section: Graphical Abstract Introductionmentioning

confidence: 99%

Carbon nitride materials: impact of synthetic method on photocatalysis and immobilization for photocatalytic pollutant degradation

Köwitsch

Mehring

2021

J Mater Sci

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“…[ 17 ] PCN for photocathodic protection have been already investigated to a good extent. Although the first examples still focused on PCN/TiO 2 heterojunctions, [ 129 ] more recent works have shown the potential of all‐PCN photoanodes for the prolonged anti‐corrosion of stainless steel. Yuyu and co‐workers first reported a PCN‐only photoanode with good anti‐corrosion properties under intermittent illumination with both white and visible light.…”

Section: Photocathodic Protection For Anti‐corrosionmentioning

confidence: 99%

“…[109,138] This is especially relevant to semiconductors having low VB potentials like PCN. [85,[129][130][131][132] A possible solution would be coupling the photoactive material with a hole-scavenging semiconductor featuring a more positive VB edge, as it was shown in a TiO 2 /Co(OH) 2 composite. [138] Finally, the OCP provided by most of the systems revised here might not be low enough for efficient prevention of steel corrosion in marine environments.…”

Section: Photocathodic Protection For Anti-corrosionmentioning

confidence: 99%

Photochargeable Semiconductors: in “Dark Photocatalysis” and Beyond

Rogolino

Savateev

2023

Adv Funct Materials

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Photochargeable semiconductors enable energy harvesting and storage in a single material. Charges separated upon absorption of photons can accumulate in highly energetic trap states if morphology, size, and chemical composition are appropriately chosen. For example, electrons can survive for several hours if hole scavengers are used to prevent their recombination with photogenerated holes, and their negative charge is balanced by positive counter‐ions. The first database of charge‐storing semiconductors is recently released, containing information from more than 50 publications within the past 40 years. Now, the database has been updated with more than 90 entries from the latest works on the topic. These materials have been largely utilized in the context of “dark photocatalysis”, that is, redox reactions enabled by photocharged semiconductors long after cessation of light irradiation. Nevertheless, a variety of further potential applications have not received enough visibility, including memory storage, steel anti‐corrosion, sensors, and micromotors. In this review, the key figures of merit of photocharged semiconductors and the empirical relationships found between them is highlighted. After showing the latest advances in dark photocatalysis, it is discussed how other application fields may benefit from these materials. For each area, promising research directions based on the findings from the database are recommended.

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“…g-C 3 N 4 : The graphitic carbon nitride (g-C 3 N 4 ), the best stable CN allotrope was recently employed widely in PECP application. [211][212][213][214][215][216][217][218] The band gap of condensed g-C 3 N 4 is ∼2.7 eV. In addition to providing PECP, a g-C 3 N 4 surface coating could also offer ample barrier effect due to its excellent acid/alkali resistance, anti-abrasion/ erosion properties, and high thermal resistance.…”

Section: Energy-storing Photoanodesmentioning

confidence: 99%

Review—Photoelectrochemical Cathodic Protection in The Dark: A Review of Nanocomposite and Energy-Storing Photoanodes

Saji

2020

J. Electrochem. Soc.

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Semiconductor photoanode-based cathodic protection, prevalently known as photoelectrochemical cathodic protection (PECP) is a potential environmentally benign alternative to the conventionally used sacrificial anode cathodic protection. The unlimited availability of solar energy is the prime attractive factor. A crucial disadvantage of PECP restricting its widespread practical application is its incapability to extend the cathodic protection in the absence of sunlight. Semiconductor nanocomposites of TiO 2 with energy-storing supercapacitor materials is the most widely investigated approach to overcome the drawback. Here, we attempt to bring together all the reported information on semiconductor photoanodes with energy-storing attributes in PECP application. Nanocomposites of TiO 2 with pseudocapacitive semiconductors are highlighted. Corresponding works published on PECP by surface coatings (analogous to sacrificial coatings) are also discussed. Future scopes of R & D presented.

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g-C3N4/TiO2 hybrid film on the metal surface, a cheap and efficient sunlight active photoelectrochemical anticorrosion coating

Cited by 19 publications

References 35 publications

Carbon nitride materials: impact of synthetic method on photocatalysis and immobilization for photocatalytic pollutant degradation

Carbon nitride materials: impact of synthetic method on photocatalysis and immobilization for photocatalytic pollutant degradation

Photochargeable Semiconductors: in “Dark Photocatalysis” and Beyond

Review—Photoelectrochemical Cathodic Protection in The Dark: A Review of Nanocomposite and Energy-Storing Photoanodes

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