Defective High-Crystallinity g-C₃N₄ Heterostructures by Double-End Modulation for Photocatalysis

ACS Energy Letters, Journal Year: 2024, Volume and Issue: 9(4), P. 1915 - 1922

Published: April 3, 2024

Photocatalytic overall water splitting is difficult due to the limitations of band structure, solar absorption efficiency, and carrier recombination. Rich nitrogen vacancies containing g-C3N4 nanosheets were prepared by spark plasma sintering. By modifying highly crystalline graphitic carbon nitride (g-C3N4) with rich as hydrogen- oxygen-producing ends building a Z-scheme heterostructure, can be achieved. Hydrogen oxygen evolution rates (λ > 320 nm) 1.51 0.75 mmol g–1 h–1 reported highest solar-to-hydrogen efficiency 1.39% for pure catalyst cocatalysts under an AM1.5G filter (100 mW cm–2) are reached. The double-ended modulation method improves photocatalytic high-crystallinity defect-rich g-C3N4.

Language: Английский

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Photoinduced Hole Trapping in MoSe₂–MoS₂ Nanoflowers/ZnO Nanosheets S-Scheme Conduit for Ultrafast Charge Transfer during Hydrogen Evolution

ACS Applied Energy Materials, Journal Year: 2024, Volume and Issue: 7(7), P. 2881 - 2895

Published: March 28, 2024

Paving the way out of sustainable energy applications, one most captivating aspirations is development state-of-the-art catalytic systems for harnessing hydrogen energy. Here, a unique MoSe2–MoS2/ZnO heterojunction with S-scheme-type band alignment has been modeled to elucidate its ascendancy toward PC, EC, and PEC generation. Optimized 5 wt % (5MMZ) exhibited 5-fold superior PC H2 production efficiency than bare ZnO, 58.6% AQY ascribed augmented solar harvesting improved photophysical properties as confirmed by optoelectronic theoretical analysis. Femtosecond transient absorption studies were carried provide deeper insights into photoinduced charge carrier behavioral dynamics. It revealed that delayed recombination electron carriers at shallow deep trap sites holes was accountable higher activity 5MMZ heterostructure. XPS DFT ascertained great deal correlation between experimental achievements predictions discussed in reaction mechanism. To determine diversified scope heterojunctions green generation, photo/electrochemical water splitting operations also performed, which further reinforced versatility this kind metal oxide (ZnO)-bilayered material (MoSe2–MoS2)-type ternary heterostructures.

Language: Английский

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Emerging rare earth perovskite nanostructures for efficient electrochemical energy conversion and storage

International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 58, P. 954 - 963

Published: Jan. 30, 2024

Language: Английский

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Hydrogen Energy as Sustainable Energy Resource for Carbon-Neutrality Realization

ACS Sustainable Resource Management, Journal Year: 2024, Volume and Issue: 1(4), P. 604 - 620

Published: April 4, 2024

For stepping toward a sustainable future, reducing carbon footprints by generation of clean source energy is viable option that captivates researchers all around the globe. Hydrogen in form renewable resource has achieved status and perceived as feasible alternative fossil derivative fuels ascribed to higher gravimetric density, which offers superior efficiency over conventional fuels. However, nature H2 synthetic route determinant for production. Traditional gray production generated via catalyzes global warming. Therefore, there need develop environmentally benign methodologies such green blue routes are discussed this review article comparing distinct methods with minimal emission, along their merits demerits. We have precisely optimization photocatalytic evolution optimizing cost catalytic system terms sustainability. Exploitation cheap noble metal free catalysts been stressed generating H2. The research domain underlines significance attaining carbon-neutral society respect economy its techno-economic analysis scalable applicability.

Language: Английский

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Ultrafast Hole Trapping in Te‐MoTe₂‐MoSe₂/ZnO S‐Scheme Heterojunctions for Photochemical and Photo‐/Electrochemical Hydrogen Production

Small, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 30, 2024

Abstract Te‐MoTe 2 ‐MoSe /ZnO S‐scheme heterojunctions are engineered to ascertain the advanced redox ability in sustainable HER operations. Photo‐physical studies have established steady state transfer of photo‐induced charge carriers whereas an improved dynamics realized by state‐of‐art ultrafast transient absorption and irradiated‐XPS analysis optimized 5wt% heterostructure. 2.5, 5, 7.5wt% photocatalysts (2.5MTMZ, 5MTMZ 7.5MTMZ) exhibited 2.8, 3.3, 3.1‐fold higher performance than pristine ZnO with marvelous apparent quantum efficiency 35.09%, 41.42% 38.79% at rate 4.45, 5.25, 4.92 mmol/g cat /h, respectively. Electrochemical water splitting experiments manifest subdued 583 566 mV overpotential values 2.5MTMZ heterostructures achieve 10 mA cm −2 current density for HER, 961 793 OER, For photocatalyst, lifetime kinetic decay interfacial step is evaluated be 138.67 ps as compared 52.92 bare ZnO.

Language: Английский

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Ultrafast Charge Transfer Dynamics in Multifaceted Quaternary Te–MoTe₂–MoS₂/ZnO S-Scheme Heterostructured Nanocatalysts for Efficient Green Hydrogen Energy

ACS Applied Energy Materials, Journal Year: 2024, Volume and Issue: 7(17), P. 7325 - 7337

Published: Aug. 20, 2024

Sustainable H2 energy generation through water splitting prevalently demands systematically designed multifaceted state-of-the-art catalysts. Herein, unique Te–MoTe2–MoS2/ZnO heterostructured nanocatalysts were engineered hydrothermally for photo-/electro-/photoelectrochemical functionalities probed to ascertain the catalytic efficiency toward production. Optimized 2.5% (2.5TMMZ) heterojunctions performed at an applicable standard with a production rate of 5.2 (mmol/gcat)/h 41% AQY during photochemical experiments. Fs-TAS studies confirmed delayed lifetime active charge carriers shallow and deep trap sites in heterostructure. Electrochemical corroborated remarkable HER OER activities 2.5TMMZ −0.51 0.76 V overpotentials. Photoelectrochemical investigations deciphered potential as it yielded nearly 3-fold higher photocurrent density than ZnO. To achieve equilibrium between conductivity–stability system, Te/S edge Te–MoTe2–MoS2 exhibited affinity H+ adsorption, whereas ZnO end catalyst took care photosensitization demonstrated via optoelectronic theoretical characterizations alongside S-scheme mechanism.

Language: Английский

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Energy-efficient hydrogen generation using multiferroic TbCrO3 nanoparticles via electrocatalysis coupled with hydrazine oxidation and photocatalysis

International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 58, P. 717 - 725

Published: Jan. 28, 2024

Language: Английский

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Enhanced Photo/Electrocatalytic Hydrogen Evolution by Hydrothermally Derived Cu-Doped TiO₂ Solid Solution Nanostructures

Langmuir, Journal Year: 2024, Volume and Issue: 40(8), P. 4063 - 4076

Published: Feb. 14, 2024

Highly efficient nanocatalysts with a high specific surface area were successfully synthesized by cost-effective and environmentally friendly hydrothermal method. Structural elemental purity, size, morphology, area, band gap of pristine 1 to 5% Cu-doped TiO2 nanoparticles characterized powder X-ray diffraction (PXRD), photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR), energy dispersive analysis (EDAX), inductively coupled plasma mass spectrometry (ICP-MS), liquid chromatography-high resolution (LC-HRMS), scanning microscopy (SEM), transmission (TEM), BET Raman spectroscopy, photoluminescence (PL) UV-visible diffused reflectance (UV-DRS) studies. The XPS EPR findings indicated the successful integration Cu ions into lattice. UV-DRS investigations revealed that an increase in dopant concentration, NPs show decrease (3.19–3.08 eV) (169.9–188.2 m2/g). Among all compositions, 2.5% has shown significant H2 evolution apparent quantum yield 17.67%. Furthermore, electrochemical water-splitting study shows have superiority over for reaction. It was thus tuning desired concentration led enhanced photo/electrocatalytic sustainable applications.

Language: Английский

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Rational integration of MoSe2 and BN with TiO2 to design nanoengineered ternary heterojunctions for sustainable hydrogen energy: Experimental evidences and theoretical anticipations

International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 82, P. 1182 - 1195

Published: Aug. 7, 2024

Language: Английский

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Superlative Porous Organic Polymers for Photochemical and Electrochemical CO₂ Reduction Applications: From Synthesis to Functionality

Langmuir, Journal Year: 2024, Volume and Issue: 40(20), P. 10414 - 10432

Published: May 10, 2024

To mimic the carbon cycle at a kinetically rapid pace, sustainable conversion of omnipresent CO

Language: Английский

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