Enhanced photocatalytic hydrogen evolution using green carbon quantum dots modified 1-D CdS nanowires under visible light irradiation

Gogoi, Devipriya; Koyani, Ravi; Golder, Animes Kumar; Peela, Nageswara Rao

doi:10.1016/j.solener.2020.08.061

Cited by 45 publications

(27 citation statements)

References 104 publications

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“…14-0688) of BiVO 4 , and a hexagonal wurtzite (JCPDS no. 41-1049) phase of CdS is owing to the phase purity and high crystallinity. , The diffraction peaks of MnO x did not appear in the spectra, attributing to its amorphous nature . At all weight ratios of CdS in the CdS/MnO x -BiVO 4 heterostructure, the diffraction peaks of both BiVO 4 and CdS were observed, confirming the successful synthesis of the heterostructure.…”

Section: Resultsmentioning

confidence: 75%

“…The band at 1390 cm –1 corresponds to trace NO 3 – . For CdS NWs, the absorption peaks at 1268 and 1076.3 cm –1 are due to the Cd–S vibrations . The MnO x -BiVO 4 absorption peak at around 560 cm –1 attributed to Mn–O vibration, which is overlapping with BiVO 4 .…”

Section: Resultsmentioning

confidence: 96%

“…The solvothermal method was used to prepare the CdS NWs according to our previous work . Briefly, 6.7 mmol of cadmium nitrate and 15.6 mmol of thiourea were dispersed in ethylenediamine (25 mL) and kept under stirring for 1 h. The mixture was moved to the TL-A and maintained at 180 °C for 72 h.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, OWS is realized by Xu et al and Wu et al using Au and carbon dots (CD) as an electron mediator (solid-state) in CdS/BiVO 4 photocatalyst in the absence of the SR. As the CdS and BiVO 4 serve as H 2 and O 2 evolution photocatalysts, respectively, the mediator facilitates the desired electron transfer. The H 2 production rates are remarkably higher over one-dimensional (1-D) CdS nanowires, due to their unique geometrical characteristics, , whereas BiVO 4 with decahedron structure in the presence of cocatalyst showed higher O 2 production . Therefore, combining highly efficient 1-D CdS and cocatalyst loaded BiVO 4 decahedron is expected to boost the OWS activity, without a solid mediator.…”

Section: Introductionmentioning

confidence: 99%

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Step-Scheme Heterojunction between CdS Nanowires and Facet-Selective Assembly of MnO_x-BiVO₄ for an Efficient Visible-Light-Driven Overall Water Splitting

Gogoi

Shah

Rambabu

et al. 2021

ACS Appl. Mater. Interfaces

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The spatial separation and transport of photogenerated charge carriers is crucial in building an efficient photocatalyst for solar energy conversion into chemical energy. A step-scheme CdS/MnO x -BiVO4 photocatalyst was synthesized by spatial deposition of MnO x and one-dimensional (1D) CdS nanowires on a three-dimensional (3D) decahedron BiVO4 surface. The photocatalytic activity of CdS/MnO x -BiVO4 for the overall water-splitting reaction was investigated without sacrificial reagent under visible light irradiation. The synthesized photocatalysts were thoroughly analyzed using high-end characterization techniques. The 5CdS/MnO x -BiVO4 exhibited the highest H2 and O2 production rates of 1.01 and 0.51 mmol g–1 h–1, respectively, with an apparent quantum yield of 11.3% in the absence of any sacrificial reagent. The excellent photoactivity is due to the presence of oxygen vacancies along with effective charge separation/transfer properties and strong interaction of cocatalysts (MnO x and Pt) with the photocatalysts (BiVO4 and CdS) in the 5CdS/MnO x -BiVO4 heterojunction. The significance of the presence of MnO x and Pt cocatalysts on the selective facets of BiVO4 for efficient overall water splitting reaction is highlighted in this work.

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Section: Resultsmentioning

confidence: 75%

Section: Resultsmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Step-Scheme Heterojunction between CdS Nanowires and Facet-Selective Assembly of MnO_x-BiVO₄ for an Efficient Visible-Light-Driven Overall Water Splitting

Gogoi

Shah

Rambabu

et al. 2021

ACS Appl. Mater. Interfaces

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“…The unique interface coupling between the three components (Cu, Cu 2 O, and N-GC) indicates electron-hole recombination. 48,49 Due to the synergy of the core-shell Cu@Cu 2 O structure and the heterojunction in Cu@Cu 2 O/N-GC, the photogenerated carriers (e CB and h VB + )…”

Section: Structure and Morphologymentioning

confidence: 99%

Core–shell Cu@Cu₂O nanoparticles embedded in 3D honeycomb-like N-doped graphitic carbon for photocatalytic CO₂ reduction

Zhang

Zhao³

et al. 2022

J. Mater. Chem. A

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Enhanced Hydrogen Production during Electro‐Oxidation of Ethanol using Plasmonic Gold Nanoparticles

et al. 2022

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Electrochemical reforming of alkaline ethanol through nonfossil fuel resources is an attractive single‐step method at room temperature and pressure for hydrogen production. Herein, solar panels are used to generate and allow low‐voltage current to flow into screen‐printed electrodes with milliscale spacing to produce a high‐intensity electric field, engendering electrolysis of alkaline ethanol into H2. The introduction of gold nanoparticles (Au NPs) with diameters between 20 and 100 nm into the electrolyte results in an enhanced capacity of the electrolyzer to produce H2 under an illumination equivalent to solar irradiance. The plasmonic Au NPs facilitate faster electro‐oxidation of the alkaline ethanol. The solar irradiance serves dual purposes—generation of a high‐intensity electric field in the electrolyte and plasmonic effects for a faster rate of H2 production. The results show current densities as high as 135, 240, and 118 A m−2 with independent variations in sizes of Au NPs, wavelength of solar radiation, and irradiance of light, respectively. Furthermore, a high Faradaic efficiency of 82% is obtained for the electrolyte solution containing Au NPs of size 50 nm. Integration of multiple screen‐printed electrodes shows further enhancement of H2 throughput, leaving a niche for the prototype to scale‐up H2 production.

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Enhanced photocatalytic hydrogen evolution using green carbon quantum dots modified 1-D CdS nanowires under visible light irradiation

Cited by 45 publications

References 104 publications

Step-Scheme Heterojunction between CdS Nanowires and Facet-Selective Assembly of MnO_x-BiVO₄ for an Efficient Visible-Light-Driven Overall Water Splitting

Step-Scheme Heterojunction between CdS Nanowires and Facet-Selective Assembly of MnO_x-BiVO₄ for an Efficient Visible-Light-Driven Overall Water Splitting

Core–shell Cu@Cu₂O nanoparticles embedded in 3D honeycomb-like N-doped graphitic carbon for photocatalytic CO₂ reduction

Enhanced Hydrogen Production during Electro‐Oxidation of Ethanol using Plasmonic Gold Nanoparticles

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Enhanced photocatalytic hydrogen evolution using green carbon quantum dots modified 1-D CdS nanowires under visible light irradiation

Cited by 45 publications

References 104 publications

Step-Scheme Heterojunction between CdS Nanowires and Facet-Selective Assembly of MnOx-BiVO4 for an Efficient Visible-Light-Driven Overall Water Splitting

Step-Scheme Heterojunction between CdS Nanowires and Facet-Selective Assembly of MnOx-BiVO4 for an Efficient Visible-Light-Driven Overall Water Splitting

Core–shell Cu@Cu2O nanoparticles embedded in 3D honeycomb-like N-doped graphitic carbon for photocatalytic CO2 reduction

Enhanced Hydrogen Production during Electro‐Oxidation of Ethanol using Plasmonic Gold Nanoparticles

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Step-Scheme Heterojunction between CdS Nanowires and Facet-Selective Assembly of MnO_x-BiVO₄ for an Efficient Visible-Light-Driven Overall Water Splitting

Step-Scheme Heterojunction between CdS Nanowires and Facet-Selective Assembly of MnO_x-BiVO₄ for an Efficient Visible-Light-Driven Overall Water Splitting

Core–shell Cu@Cu₂O nanoparticles embedded in 3D honeycomb-like N-doped graphitic carbon for photocatalytic CO₂ reduction