Enhanced Charge Transfer Process of Bismuth Vanadate Interleaved Graphitic Carbon Nitride Nanohybrids in Mediator‐Free Direct Z Scheme Photoelectrocatalytic Water Splitting

Murugan, C.; Nataraj, Ramakrishnan Abinav; Kumar, Manesh; Ravichandran, S.; Pandikumar, Alagarsamy

doi:10.1002/slct.201900732

Cited by 38 publications

(23 citation statements)

References 60 publications

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“…The prominent negative shift of flat band potential for BiVO 4 /GCN photoanode is related to the favorable band gap (BiVO 4 ∼ 2.46 eV and GCN ∼ 2.7 eV) and conduction band position (BiVO 4 ∼ 0.249 V RHE and GCN = ca. −1.17 V RHE ) . This will lead to the formation of the band bending at the nanojunction between GCN and BiVO 4 , which ultimately help in efficient charge transfer with minimizing the recombination losses of charge carriers responsible for water oxidation.…”

Section: Results and Discussionmentioning

confidence: 99%

Photoelectrochemical Solar Water Splitting: The Role of the Carbon Nanomaterials in Bismuth Vanadate Composite Photoanodes toward Efficient Charge Separation and Transport

et al. 2019

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Photoelectrochemical performance of bismuth vanadate (BiVO 4 ) photoanode is limited by poor charge separation and transport properties. The roles of carbon nanotube, reduced graphene oxide, or graphitic carbon nitride in BiVO 4 composite photoanode were investigated toward enhancing light absorption and reducing overall impedance during photoelectrochemical water oxidation process. X-ray diffraction and Tauc analysis showed that BiVO 4 retains its monoclinic phase, n-type semiconductor nature, and band gap in all carbon nanomaterials-incorporated composite photoanodes. It was observed that the carbon nanomaterials incorporation in BiVO 4 film increases its surface porosity, ultimately leading to enhanced light absorption. The BiVO 4 photoanode with reduced graphene oxide and graphitic carbon nitride showed same bulk charge separation efficiency, whereas the latter showed better charge transfer. It was found that the graphitic carbon nitride formed composite with BiVO 4 to provide enhanced light absorption efficiency, i.e., 89% in 350−505 nm range. The BiVO 4 with graphitic carbon nitride photoanode showed the best performance with a photocurrent of 2.2 mA cm −2 , charge separation efficiency of 67%, and photocurrent of 4.0 mA cm −2 with cobalt−phosphate surface catalyst at 1.23 V RHE for water oxidation under 1 sun illumination. The Mott−Schottky and impedance measurements confirmed the shift of conduction band position toward hydrogen reduction potential and reduction in film resistance, respectively, with carbon nanomaterials addition, and the shift was most significant for graphitic carbon nitride. It is concluded that by concomitant formation of junction during photoanode fabrication between carbon nanomaterials, BiVO 4 , and fluorine-doped tin oxide glass substrate, better charge separation, transport, and light absorption can be achieved.

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Section: Results and Discussionmentioning

confidence: 99%

Photoelectrochemical Solar Water Splitting: The Role of the Carbon Nanomaterials in Bismuth Vanadate Composite Photoanodes toward Efficient Charge Separation and Transport

et al. 2019

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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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“…Fourier transform infrared (FT-IR) spectra were recorded to reveal the interfacial interactions. Figure f depicts the symmetric stretching vibrations of the VO 4 unit on pristine BVNS from 600 to 800 cm –1 , and no obvious change is seen after Au modification. Besides, the additional peaks at 1058, 1114, 1291, 1330, and 1412 cm –1 appear in 3CuPc/BVNS, which are ascribed to phthalocyanine skeletal and center metal–ligand vibrations, respectively .…”

Section: Resultsmentioning

confidence: 99%

Au-Modulated Z-Scheme CuPc/BiVO₄ Nanosheet Heterojunctions toward Efficient CO₂ Conversion under Wide-Visible-Light Irradiation

Bian

Sun

Zhang

et al. 2021

ACS Sustainable Chem. Eng.

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Unraveling the sluggish charge separation, insufficient catalytic sites, and limited visible-light absorption for Z-scheme heterojunction photocatalysts still remains a great challenge toward CO2 conversion. Herein, ultrafine Au-modulated copper phthalocyanine/BiVO4 nanosheet heterojunctions (CuPc/Au-BVNS) with wide-visible-light responses have been successfully fabricated as efficient photocatalysts for CO2 conversion to CO, achieving 9-time and 35-time photoactivity improvement compared to pristine BVNS (ca. 5 nm) and the previously reported BiVO4 nanoflake (ca. 15 nm), respectively. The exceptional photoactivity is mainly attributed to the ultrafine Au interfacial modulation, which is well capable of inducing the directional electron migration of BVNS and the highly dispersed CuPc assembly with the increased loading amount, synergistically strengthening the Z-scheme charge transfer and separation mainly based on the surface photovoltage spectroscopy assisted with the monochromatic beam and electron paramagnetic resonance technique. Moreover, the in situ diffuse reflectance infrared Fourier transform spectroscopy, CO2 temperature-programmed desorption measurement, and electrochemical results demonstrate that the central metal Cu2+ in the high-dispersion CuPc exhibits potential catalytic functions for CO2 reduction, much superior to other metals in MPc (M = Co and Ni)-modified ones. This work highlights the importance of strengthening artificial Z-scheme charge transfer and provides new strategies for designing BiVO4-based heterojunctions by controllably assembling MPc toward efficient solar-driven CO2 conversion.

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Enhanced Charge Transfer Process of Bismuth Vanadate Interleaved Graphitic Carbon Nitride Nanohybrids in Mediator‐Free Direct Z Scheme Photoelectrocatalytic Water Splitting

Cited by 38 publications

References 60 publications

Photoelectrochemical Solar Water Splitting: The Role of the Carbon Nanomaterials in Bismuth Vanadate Composite Photoanodes toward Efficient Charge Separation and Transport

Photoelectrochemical Solar Water Splitting: The Role of the Carbon Nanomaterials in Bismuth Vanadate Composite Photoanodes toward Efficient Charge Separation and Transport

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

Au-Modulated Z-Scheme CuPc/BiVO₄ Nanosheet Heterojunctions toward Efficient CO₂ Conversion under Wide-Visible-Light Irradiation

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Enhanced Charge Transfer Process of Bismuth Vanadate Interleaved Graphitic Carbon Nitride Nanohybrids in Mediator‐Free Direct Z Scheme Photoelectrocatalytic Water Splitting

Cited by 38 publications

References 60 publications

Photoelectrochemical Solar Water Splitting: The Role of the Carbon Nanomaterials in Bismuth Vanadate Composite Photoanodes toward Efficient Charge Separation and Transport

Photoelectrochemical Solar Water Splitting: The Role of the Carbon Nanomaterials in Bismuth Vanadate Composite Photoanodes toward Efficient Charge Separation and Transport

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

Au-Modulated Z-Scheme CuPc/BiVO4 Nanosheet Heterojunctions toward Efficient CO2 Conversion under Wide-Visible-Light Irradiation

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Au-Modulated Z-Scheme CuPc/BiVO₄ Nanosheet Heterojunctions toward Efficient CO₂ Conversion under Wide-Visible-Light Irradiation