Ultra-thin deaminated tri-s-triazine-based crystalline nanosheets with high photocatalytic hydrogen evolution performance

Zhou, Xuan; Shi, Weilong; Xu, Wei; Wang, Yong; Wang, Yuanqi; Wu, Yizhang; Wu, Niandu; Sun, Yuan; Du, Youwei; Wei, Zhong

doi:10.1016/j.jallcom.2020.154307

Cited by 24 publications

(7 citation statements)

References 62 publications

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“…PHI with a nanoparticle shape was achieved in our previous work by a steam-assisted method, which showed highly improved photocatalytic activity 38.4 and 3.4 times that of PCN and bulk PHI, respectively . Additionally, the ultrathin PHI nanosheets of about 2 nm in thickness were also synthesized by a simple thermal procedure . However, this research mainly focused on the PHI morphology regulation to increase the active sites rather than optimize the other crucial factor, i.e., the light response ability.…”

Section: Introductionmentioning

confidence: 99%

“…22 Additionally, the ultrathin PHI nanosheets of about 2 nm in thickness were also synthesized by a simple thermal procedure. 23 However, this research mainly focused on the PHI morphology regulation to increase the active sites rather than optimize the other crucial factor, i.e., the light response ability. The meaningful research about optimizing the optical absorption property of PHI was also reported.…”

Section: Introductionmentioning

confidence: 99%

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Optimizing the Optical Absorption of Poly(heptazine imide) by the n → π* Electron Transition for Improved Photocatalytic H₂ Evolution

Wang

Shu

Zhou

et al. 2022

ACS Appl. Mater. Interfaces

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Poly(heptazine imide) (abbreviated as PHI), a heptazine-based crystalline carbon nitride photocatalyst, has attracted widespread attention in the photocatalytic H2 evolution benefiting from its high crystallinity. Nevertheless, the optical absorption range of the directly synthesized PHI is generally narrow, which severely hinders the utilization of visible light. Much research aimed to extend the optical absorption range of PHI; however, either the optimization degree was insufficient or the synthesis process was cumbersome. Herein, red PHI (RPHI) for improving the photocatalytic H2 evolution was facilely synthesized by the one step method. The optimal RPHI sample possesses an obvious new absorption band of the n → π* electron transition and exhibits a significantly enhanced photocatalytic H2 evolution rate of 169 μmol h–1 (λ > 510 nm) and 46 μmol h–1 (λ > 600 nm), which is about 5 times (λ > 510 nm) and 7.7 times (λ > 600 nm) that of pristine PHI and surpasses most reported RPHIs. This work may promote the development of the PHI photocatalyst for near-infrared photocatalytic H2 production.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimizing the Optical Absorption of Poly(heptazine imide) by the n → π* Electron Transition for Improved Photocatalytic H₂ Evolution

Wang

Shu

Zhou

et al. 2022

ACS Appl. Mater. Interfaces

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“…The stretching vibration band at about 1000–1750 cm –1 could represent the CN heterocyclic ring (such as sp 2 CN) . As for stretching vibration bands located at 3000–3600 cm –1 , they were deemed to be N–H stretching . All stretching vibration bands did not shift in comparing all samples, which revealed that the basic structure of carbon nitride was not changed after loading Au, Cu, and AuCu NPs.…”

Section: Resultsmentioning

confidence: 92%

Nanoarchitectonics of g-C₃N₄ Nanosheets with a AuCu Enhancement Effect for Superior Photo- and Electrochemical Activity

Zhang

Xia

et al. 2022

Langmuir

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AuCu alloy nanoparticles (NPs) were embedded in superior thin g-C3N4 nanosheets by a mechanochemical pre-reaction and subsequent thermal polymerization at high temperature. The introduction of AuCu NPs increased conductivity, decreased the band gap, expended light absorption, and improved the separation and transfer efficiencies of photogenerated electrons and holes. Moreover, the uniform distribution of AuCu NPs in g-C3N4 nanosheets is ascribed to the pre-reaction of bulk g-C3N4 and metal salts to create activity cites. The adsorption ability in the visible light region was improved due to the plasma effect of Au. AuCu/g-C3N4 composites (AuCu/CN-1%) with optimized component ratios revealed the highest transient photocurrent responses, the lowest electrochemical impedance arc radius, and the best photocatalytic H2 evolution rate of 930.2 μmol g–1 h–1. These findings exhibited that loading AuCu bimetallic NPs could efficiently offset some disadvantages of g-C3N4 and improve its photocatalytic performances.

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“…To assess its performance objectively, we compare it with the heptazine-based CN photocatalysts reported so far. As shown in Figure 8, although the photocatalytic activity of KCN630 is less than the nanoscale crystalline CN samples, they are still better than most heptazine-based crystalline CN materials with plain morphology [8,26,29,31,[41][42][43][44][45][46][47][48][49].…”

Section: Optical and Photoelectricalmentioning

confidence: 95%

Optimizing the Crystallinity of Heptazine‐Based Crystalline Carbon Nitride by Regulating Temperature for Enhanced Photocatalytic H₂ Evolution

Tang

Wang

Zhou

et al. 2022

Journal of Nanomaterials

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Polymeric carbon nitride (PCN), as a metal-free photocatalyst, has drawn wide attention in the photocatalytic H2 evolution. However, the photocatalytic activity of directly synthesized PCN is limited by its low crystallinity. Currently, regulating the melon-based PCN into tri-s-triazine-based crystalline PCN to further optimize its structure has been proved to effectively improve its photocatalytic activity. The heptazine-based crystalline carbon nitride, potassium poly(heptazine imide) (abbreviated as K-PHI), has been used in photocatalytic H2 evolution benefiting from its high crystallinity, as the high crystallinity narrows the bandgap and increases the light capture efficiency and increases the charge mobility. Nevertheless, the effect of synthesis temperature on crystallinity has not yet been reported. In this work, the effect of temperature on the crystallinity of heptazine-based crystalline carbon nitride was studied by one-step synthesis at different temperatures. It shows that the heptazine-based crystalline structure appears when the temperature exceeds 540°C. Additionally, the crystallinity of all samples is gradually improved with increasing temperature until the sample begins to decompose beyond 630°C. The sample synthesized at 630°C demonstrates the highest photocatalytic H2 evolution rate of 1.798 mmol h−1 g−1 under visible light irradiation, which is 31.5 times that of bulk PCN. Based on systematic material characterizations, the mechanism of the effect of synthesis temperature on crystallinity and the contribution of crystallinity to photocatalytic efficiency were revealed.

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Ultra-thin deaminated tri-s-triazine-based crystalline nanosheets with high photocatalytic hydrogen evolution performance

Cited by 24 publications

References 62 publications

Optimizing the Optical Absorption of Poly(heptazine imide) by the n → π* Electron Transition for Improved Photocatalytic H₂ Evolution

Optimizing the Optical Absorption of Poly(heptazine imide) by the n → π* Electron Transition for Improved Photocatalytic H₂ Evolution

Nanoarchitectonics of g-C₃N₄ Nanosheets with a AuCu Enhancement Effect for Superior Photo- and Electrochemical Activity

Optimizing the Crystallinity of Heptazine‐Based Crystalline Carbon Nitride by Regulating Temperature for Enhanced Photocatalytic H₂ Evolution

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Ultra-thin deaminated tri-s-triazine-based crystalline nanosheets with high photocatalytic hydrogen evolution performance

Cited by 24 publications

References 62 publications

Optimizing the Optical Absorption of Poly(heptazine imide) by the n → π* Electron Transition for Improved Photocatalytic H2 Evolution

Optimizing the Optical Absorption of Poly(heptazine imide) by the n → π* Electron Transition for Improved Photocatalytic H2 Evolution

Nanoarchitectonics of g-C3N4 Nanosheets with a AuCu Enhancement Effect for Superior Photo- and Electrochemical Activity

Optimizing the Crystallinity of Heptazine‐Based Crystalline Carbon Nitride by Regulating Temperature for Enhanced Photocatalytic H2 Evolution

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Optimizing the Optical Absorption of Poly(heptazine imide) by the n → π* Electron Transition for Improved Photocatalytic H₂ Evolution

Optimizing the Optical Absorption of Poly(heptazine imide) by the n → π* Electron Transition for Improved Photocatalytic H₂ Evolution

Nanoarchitectonics of g-C₃N₄ Nanosheets with a AuCu Enhancement Effect for Superior Photo- and Electrochemical Activity

Optimizing the Crystallinity of Heptazine‐Based Crystalline Carbon Nitride by Regulating Temperature for Enhanced Photocatalytic H₂ Evolution