Improving hole mobility with the heterojunction of graphitic carbon nitride and titanium dioxide via soft template process in photoelectrocatalytic water splitting

Murugan, C.; Bhojanaa, K. B.; Ong, Wee‐Jun; Jothivenkatachalam, Kandasamy; Pandikumar, Alagarsamy

doi:10.1016/j.ijhydene.2019.09.114

Cited by 57 publications

(29 citation statements)

References 59 publications

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“…Several carbon-based materials such as graphene oxide (GO), carbon nanofibers (CNFs), carbon nanotubes (CNTs), ordered mesoporous carbon (OMC), and graphitic carbon nitride (GCN) have been used for electrochemical sensors. Among them, GCN received a lot of attention due to its unique structural characteristics, large surface area, high electrical conductivity, high mechanical strength, and chemical stability. − In addition, many researchers have reported that heteroatom (S, N, P) doping in the GCN framework is an excellent strategy for improving its activity more effectively for various electrochemical applications, including sensing, photocatalytic degradation, and water catalysis. − Through this, MoN’s stability and electrical conductivity can be enhanced by forming a composite material with heteroatom-doped GCN. − As a result, the combination of MoN and heteroatom-doped GCN is expected to significantly enhance the activity of the electrochemical sensor.…”

Section: Introductionmentioning

confidence: 99%

MoN Nanorod/Sulfur-Doped Graphitic Carbon Nitride for Electrochemical Determination of Chloramphenicol

Ganesamurthi

Manavalan

Chen

et al. 2020

ACS Sustainable Chem. Eng.

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In the present work, we report a one-step pyrolysis synthesis of molybdenum nitride nanorods (MoN NRs) using ammonium heptamolybdate tetrahydrate as a precursor. Properties of MoN NRs have been improved by the sulfur-doped graphitic carbon nitride (MoN@S-GCN) nanocomposite, which has been used to modify the glassy carbon electrode (GCE) for the electrochemical determination of chloramphenicol (CAP). The large surface area of S-GCN-anchored MoN NRs in the nanocomposite demonstrates a synergistic effect of the transport of a kinetic barrier electron and a well-defined redox cycle within the ferricyanide system. In the electrochemical determination of CAP over MoN@S-GCN/GCE, cyclic voltammetry (CV) showed a superior electrochemical response to the CAP concentration, while bare GCE and other modified GCEs showed an inferior electrochemical response. In addition, different concentrations, scanning rates, and pH electrolyte tests have been performed for MoN@S-GCN/GCE, which verified that it is an appropriate candidate for electrochemical detection of CAP. Differential pulse voltammetry (DPV) in the electrochemical determination of CAP exhibits a low detection limit of 6.9 nM and a sensitivity of 1.0557 μM μA–1 cm–2 for the current response, yielding a linear increase with increasing concentration of CAP from 0.5 to 2450 μM. Moreover, the proposed sensor shows appreciable selectivity and satisfactory recovery for real samples of milk and eye drop solutions.

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Section: Introductionmentioning

confidence: 99%

MoN Nanorod/Sulfur-Doped Graphitic Carbon Nitride for Electrochemical Determination of Chloramphenicol

Ganesamurthi

Manavalan

Chen

et al. 2020

ACS Sustainable Chem. Eng.

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“…When only C 3 N 4 is supported on TiO 2 , the constructed heterojunction can make the photogenerated charge carriers move directionally, thereby accelerating the transfer of surface charges, thus increasing the separation efficiency of photogenerated electrons and holes. [45] When Co atoms are introduced into the TiO 2 @C 3 N 4 system, Co acts as a co-catalyst, providing a direct path for charge transfer to improve charge collection and injection efficiency. Accordingly, the IPCE value of TiO 2 @Co-C 3 N 4 was promoted to 39 %.…”

Section: Photoelectrocatalytic Activity Of the Compositesmentioning

confidence: 99%

Composite of Cobalt‐C₃N₄ on TiO₂ Nanorod Arrays as Co‐catalyst for Enhanced Photoelectrochemical Water Splitting

Shang

et al. 2021

ChemistrySelect

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TiO 2 @Co-C 3 N 4 nanorod arrays were prepared by drop coating and hydrothermal method. The Photoelectrochemical (PEC) performance of TiO 2 @Co-C 3 N 4 nanorod arrays can be tuned by the amount of Co-C 3 N 4 coated. When the amount of Co-C 3 N 4 reached about 0.75 μg/cm 2 , the PEC performance of TiO 2 @Co-C 3 N 4 reached the maximum. The results show that the photocurrent density of TiO 2 @Co-C 3 N 4 nanorod array reaches 1.79 mA/cm 2 at 1.23 V RHE , which is about 2.3 times of that from TiO 2 @g-C 3 N 4 . And the PEC device has good stability and the photocurrent density remains no decline after 10 hours of continuous operation. Co atoms coordinated with g-C 3 N 4 could act as a co-catalyst for water oxidation, and a possible mechanism is proposed for water oxidation based on careful analysis of the detailed results. The holes photogenerated by excited electrons oxidize Co atoms from Co II to Co III and Co IV , and then these high-valence cobalt species accelerate the kinetics of water oxidation. In addition, Co-C 3 N 4 not only can promote the charge transfer but also improve the overall energy conversion efficiency of the PEC device.

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“…Note that n depends on the nature of the electronic transitions responsible for the absorption and is equal to two for allowed indirect transitions. The intercept of the tangent to the absorption curves was used to estimate the band gap (E g ) values of the samples, that were found to decrease according to the increasing amount of activated carbon content: 3.10, 2.85, and 2.66 eV for samples Ti, TiLAC-9/1 and TiLAC-7/3 respectively, indicating an enhancement of TiO 2 response in visible light region [51].…”

Section: Uv-vis Diffuse Reflectance Spectroscopymentioning

confidence: 99%

Advantages of the Incorporation of Luffa-Based Activated Carbon to Titania for Improving the Removal of Methylene Blue from Aqueous Solution

et al. 2021

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This research aims to study the possible improvement of methylene blue (MB) removal from aqueous solution by hybrid adsorbent-catalysts (AdsCats) prepared through the incorporation of activated carbon derived from Luffa cylindrica fibers (LAC) to TiO2 photocatalysts. LAC with a specific surface area of 1170 m2/g was prepared by chemical activation with phosphoric acid at 500 °C. TiO2/LAC composites with 70 and 90 wt.% Degussa P25 titania content were prepared. The materials were characterized by N2 physical adsorption, XRD, FTIR, and XPS. The AdsCats displayed a very good dispersion of TiO2 over LAC, a surface area of close to 200 or 400 m2/g, depending on the composition, and high crystallinity, showing the presence of anatase and rutile phases. MB removal was studied in two different scenarios: under UV-light after reaching adsorption equilibrium, and under UV-light once the liquid effluent and the AdsCats were in contact. The MB removal by LAC has proved to be very efficient, highlighting the predominant role of adsorption over photodegradation. The prepared AdsCats have also been compared with their components. The results showed that TiLAC hybrids have superior photocatalytic performance than P25, showing TiLAC-7/3 90% MB removal with respect to the initial concentration just after 30 min of UV light irradiation for both studied scenarios.

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Improving hole mobility with the heterojunction of graphitic carbon nitride and titanium dioxide via soft template process in photoelectrocatalytic water splitting

Cited by 57 publications

References 59 publications

MoN Nanorod/Sulfur-Doped Graphitic Carbon Nitride for Electrochemical Determination of Chloramphenicol

MoN Nanorod/Sulfur-Doped Graphitic Carbon Nitride for Electrochemical Determination of Chloramphenicol

Composite of Cobalt‐C₃N₄ on TiO₂ Nanorod Arrays as Co‐catalyst for Enhanced Photoelectrochemical Water Splitting

Advantages of the Incorporation of Luffa-Based Activated Carbon to Titania for Improving the Removal of Methylene Blue from Aqueous Solution

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Improving hole mobility with the heterojunction of graphitic carbon nitride and titanium dioxide via soft template process in photoelectrocatalytic water splitting

Cited by 57 publications

References 59 publications

MoN Nanorod/Sulfur-Doped Graphitic Carbon Nitride for Electrochemical Determination of Chloramphenicol

MoN Nanorod/Sulfur-Doped Graphitic Carbon Nitride for Electrochemical Determination of Chloramphenicol

Composite of Cobalt‐C3N4 on TiO2 Nanorod Arrays as Co‐catalyst for Enhanced Photoelectrochemical Water Splitting

Advantages of the Incorporation of Luffa-Based Activated Carbon to Titania for Improving the Removal of Methylene Blue from Aqueous Solution

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Composite of Cobalt‐C₃N₄ on TiO₂ Nanorod Arrays as Co‐catalyst for Enhanced Photoelectrochemical Water Splitting