Simultaneous formation of mesopores and homojunctions in graphite carbon nitride with enhanced optical absorption, charge separation and photocatalytic hydrogen evolution

Ba, Guiming; Liang, Zhiwei; Li, Haiping; Du, Na; Liu, Jianqiang

doi:10.1016/j.apcatb.2019.04.084

Cited by 75 publications

(14 citation statements)

References 51 publications

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“…Photocatalytic reactions for hydrogen (H 2 ) evolution were carried out in a CEL-SPH2N water splitting system (China Education Aulight Co., LTD) with a 300 Xe-arc lamp (CEL-HXF 300) attached with a cut-off filter (λ420 nm). Pt (1 wt%) was loaded on the surface of the samples as co-catalyst via the photodeposition method [20], using H 2 PtCl 6 aqueous solution as precursors. Pt-modified photocatalyst (100 mg) was added to 100 mL of water containing 10 mL of triethanolamine as sacrificial agent.…”

Section: Photocatalytic Hydrogen Evolution Performancementioning

confidence: 99%

Hydrothermal synthesis of single-crystal Cr-doped SrTiO₃ for efficient visible-light responsive photocatalytic hydrogen evolution

Jiang

Shi

et al. 2020

Mater. Res. Express

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Visible-light-driven Cr-doped SrTiO 3 nanocubes were successfully synthesized by hydrothermal method in alkaline KOH conditions. X-ray diffraction spectroscopy (XRD), Raman spectra, x-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were used to characterize the samples, and the Cr-doped SrTiO 3 possess cubic morphology with about 30-50 nm in size, and single-crystal feature. In addition, the Cr-doped SrTiO 3 extended light-harvesting properties to visible-light region which was testified by UV-vis absorption spectra, and excellent charge transfer and separation efficiency were approved by photo fluorescence spectra (PL), electrochemical impedance spectroscopy (EIS) and photocurrent response measurements. Among the synthesized photocatalysts, SrTiO 3 nanocubes doped with 2% Cr by molar ratio exhibits the highest photocatalytic activity, achieving 11.66 μmol of H 2 evolution during 5 h visiblelight irradiation. This study provides a facile and effective way to enhance the performance of SrTiO 3 -based photocatalysts.

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Section: Photocatalytic Hydrogen Evolution Performancementioning

confidence: 99%

Hydrothermal synthesis of single-crystal Cr-doped SrTiO₃ for efficient visible-light responsive photocatalytic hydrogen evolution

Jiang

Shi

et al. 2020

Mater. Res. Express

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“…Compared with those of TPPA and CdS, the EPR signal of CdS@TPPA2 enhances obviously whether under light or dark, originating from a much higher unpaired electron concentration, which is conducive to the proton reduction [ 41 ]. Moreover, the EPR signals of all three samples are stronger under visible light irradiation than those in dark, implying an increase in the concentration of unpaired electrons due to the photoinduced charge separation [ 42 ]. These results unveil that core-shell CdS@TPPA nanospheres have a more delocalized structure in comparison to pristine TPPA, which can favor the charge migration and then inhibit the charge recombination [ 43 ].…”

Section: Resultsmentioning

confidence: 99%

On-Surface Bottom-Up Construction of COF Nanoshells towards Photocatalytic H ₂ Production

et al. 2021

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The rational design of an outer shell is of great significance to promote the photocatalytic efficiency of core-shell structured photocatalysts. Herein, a covalent organic framework (COF) nanoshell was designed and deposited on the cadmium sulfide (CdS) core surface. A typical COF material, TPPA, featuring exceptional stability, was synthesized through interfacial polymerization using 1, 3, 5-triformylphloroglucinol (TP) and p-phenylenediamine (PA) as monomers. The nanoshell endows the CdS@TPPA nanosphere with ordered channels for unimpeded light-harvesting and fast diffusion of reactants/products and well-defined modular building blocks for spatially charge separation. Moreover, the heterojunction formed between CdS and TPPA can further facilitate the effective charge separation at the interface via lower exciton binding energy compared with that of pristine TPPA. By modulating the thickness of TPPA nanoshell, the CdS@TPPA nanosphere photocatalyst with the nanoshell thickness of about 8±1 nm exhibits the highest photocatalytic H2 evolution of 194.1 μmol h-1 (24.3 mmol g-1 h-1, 8 mg), which is superior to most of the reported COF-based photocatalysts. The framework nanoshell in this work may stimulate the thinking about how to design advanced shell architecture in the core-shell structured photocatalysts to achieve coordinated charge and molecule transport.

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“…[ 39 ] In addition, the g value of Hf‐g‐C 3 N 4 slightly decreased from 2.0037 to 2.0032, which further revealed that the unpaired electron density increased or the electron delocalization enhanced. [ 40 ] Therefore, the increase of carbon content, Bandgap structure changes and hollow structure can help to improve photoelectron transfer, enhance reduction potential and increase light scattering inside and light utilization efficiency, respectively. The synergistic effects of these factors facilitate qualitative change in the properties of the material.…”

Section: Resultsmentioning

confidence: 99%

Fusiform‐Shaped g‐C₃N₄ Capsules with Superior Photocatalytic Activity

Jiang

Zhang

Chen

et al. 2020

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Carbon nitride (g‐C3N4) nanostructure rebuilding is an effective means to modify its photocatalytic properties, especially the hollow micron‐nanostructure. The increased scattering in the body effectively improves the light utilization efficiency and improves catalytic properties. In this work, fusiform‐shaped g‐C3N4 capsules are created by controlling the nucleation kinetics of supramolecular assemblies. The fusiform‐shaped capsule micron‐nanostructure is synthesized with ultrathin wall thickness and adjusted carbon/nitride ratios which decrease the recombination rate of photo‐generated carriers. The hollow nanostructure and relatively higher specific surface area of the fusiform‐shaped capsule effectively enhance light scattering inside body and lead to an enhanced carrier utilization efficiency. Moreover, the decrease of bandgap and relatively negative conduction band position affect the response of hollow fusiform‐shaped g‐C3N4 capsules (Hf‐g‐C3N4) in visible light region and improve the photo‐reducing performance. In term of H2 evolution property, Hf‐g‐C3N4 has been improved to 7052 µmol g−1 h−1, which is 10.9 times higher compared with bulk structure. More importantly, Hf‐g‐C3N4 can produce CH4 at the rate of 1.63 µmol g−1 h−1 without help of co‐catalyst and hole sacrificial agent in the photocatalytic reduction reaction of CO2 to CH4. At same time, the selective photocatalytic reduction of CO2 is another advantage of Hf‐g‐C3N4.

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Simultaneous formation of mesopores and homojunctions in graphite carbon nitride with enhanced optical absorption, charge separation and photocatalytic hydrogen evolution

Cited by 75 publications

References 51 publications

Hydrothermal synthesis of single-crystal Cr-doped SrTiO₃ for efficient visible-light responsive photocatalytic hydrogen evolution

Hydrothermal synthesis of single-crystal Cr-doped SrTiO₃ for efficient visible-light responsive photocatalytic hydrogen evolution

On-Surface Bottom-Up Construction of COF Nanoshells towards Photocatalytic H ₂ Production

Fusiform‐Shaped g‐C₃N₄ Capsules with Superior Photocatalytic Activity

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Simultaneous formation of mesopores and homojunctions in graphite carbon nitride with enhanced optical absorption, charge separation and photocatalytic hydrogen evolution

Cited by 75 publications

References 51 publications

Hydrothermal synthesis of single-crystal Cr-doped SrTiO3 for efficient visible-light responsive photocatalytic hydrogen evolution

Hydrothermal synthesis of single-crystal Cr-doped SrTiO3 for efficient visible-light responsive photocatalytic hydrogen evolution

On-Surface Bottom-Up Construction of COF Nanoshells towards Photocatalytic H 2 Production

Fusiform‐Shaped g‐C3N4 Capsules with Superior Photocatalytic Activity

Contact Info

Product

Resources

About

Hydrothermal synthesis of single-crystal Cr-doped SrTiO₃ for efficient visible-light responsive photocatalytic hydrogen evolution

Hydrothermal synthesis of single-crystal Cr-doped SrTiO₃ for efficient visible-light responsive photocatalytic hydrogen evolution

On-Surface Bottom-Up Construction of COF Nanoshells towards Photocatalytic H ₂ Production

Fusiform‐Shaped g‐C₃N₄ Capsules with Superior Photocatalytic Activity