A high-cyano groups-content amorphous-crystalline carbon nitride isotype heterojunction photocatalyst for high-quantum-yield H2 production and enhanced CO2 reduction

Cheng, Cheng; Mao, Liuhao; Kang, Xin; Dong, Chung‐Li; Huang, Yu‐Cheng; Shen, Shaohua; Shi, Jinwen; Guo, Liejin

doi:10.1016/j.apcatb.2023.122733

Cited by 90 publications

(45 citation statements)

References 44 publications

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“…The surface chemical composition of the VPQDs was analyzed by high-resolution XPS. 41 As shown in Fig. 3A, the peaks of P 2p spectra with binding energy located at 129.6 and 130.5 eV are assigned to P 2p 3/2 and P 2p 1/2 of PP bonds, respectively, which are characteristic of crystalline VP.…”

Section: Resultsmentioning

confidence: 94%

Violet phosphorus quantum dots as an emerging visible light-responsive photocatalyst for an efficient hydrogen evolution reaction

et al. 2023

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Section: Resultsmentioning

confidence: 94%

Violet phosphorus quantum dots as an emerging visible light-responsive photocatalyst for an efficient hydrogen evolution reaction

et al. 2023

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“…The K‐Fe/ZrO 2 catalyst had two XPS peaks belonging to K 2 p 3/2 and K 2 p 1/2 around 295.6 and 292.9 eV. However, the XPS peaks of K 2 p 3/2 and K 2 p 1/2 for K‐Fe/ZrO 2 ‐W catalyst were located at 293.1 and 295.9 eV, respectively 49 . It was clearly noted that the K 2 p XPS peaks of the K‐Fe/ZrO 2 ‐W catalyst were significantly shifted towards the direction of higher binding energy compared with that of the K‐Fe/ZrO 2 catalyst, which indicated that there might be a strong interaction between K and W species.…”

Section: Resultsmentioning

confidence: 97%

Comparative study on K‐tolerance performance of Fe/ZrO₂ and Fe/ZrO₂‐W catalysts for NH₃‐SCR of NO_x

Han

et al. 2023

J of Chemical Tech & Biotech

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BACKGROUND: Selective catalytic reduction (SCR) of nitrous oxides (NO x ) with ammonia (NH 3 ) as reductant is used worldwide in mobile and stationary sources to reach strict emission standards. It is a feasible strategy to modify support with acidic metal oxides to improve the alkali metal potassium (K) tolerance of SCR catalysts. Herein, a comparative investigation was conducted based on iron/zirconium dioxide (Fe/ZrO 2 )and Fe/ZrO 2 -tungsten (W) catalysts to reveal the correlation of support modification with W and K-tolerance performance. RESULTS: The NO x conversion for K-Fe/ZrO 2 catalyst was <80% across the whole temperature range, and the catalyst was completely deactivated at ≈400 °C. As expected, the Fe/ZrO 2 -W catalyst exhibited a much superior anti-K-performance in comparison to the Fe/ZrO 2 catalyst. The active temperature window for K-Fe/ZrO 2 -W catalyst was 285-485 °C (NO x conversion of >80%).CONCLUSION: According to the characterization results, it was found that K-species impose a negative impact on NH 3 adsorption on the surface of the Fe/ZrO 2 catalyst, especially drastically preventing the adsorption of NH 3 species on Brønsted acid sites, thus inhibiting the occurrence of SCR reactions via the Langmuir-Hinshelwood (L-H) mechanism. By contrast, W modification resulted in more chemisorbed oxygen, stronger redox capacity and an increased Fe 3+ /(Fe 3+ +Fe 2+ ) ratio on the surface of the Fe/ZrO 2 -W catalyst. More importantly, W modification brought about abundant Brønsted acid sites, significantly promoting NH 3 adsorption and activation. W modification also weakened the adsorption stability of NO x species to a certain extent. As a result, SCR reactions over the Fe/ZrO 2 -W catalyst could proceed via both Eley-Rideal (E-R) and L-H pathways.

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“…The strongest signal at 398.1 eV is assigned to C−N�C, representing the sp 2 hybridization nitrogen in the triazine group, while the peak at 400.0 eV is associated with the tertiary nitrogen group (N−(C) 3 ). 39 The above two major signal peaks synergistically build a π−π conjugated supramolecular network. Meanwhile, a very weak deconvolution peak appears at 403.8 eV, which can be seen as a charging effect of the amino group (C−N−H) or heterocycles remaining in the main structure of g-CN due to incomplete condensation.…”

Section: Resultsmentioning

confidence: 99%

Graphitic Carbon Nitride Modified with 2-Aminothiophene-3-Carbonitrile to Boost Molecular Dipole and n → π* Electronic Transition for Photoreduction of Carbon Dioxide

Wang

et al. 2023

ACS Appl. Nano Mater.

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Charge-transfer dynamics and light utilization efficiency are two critical factors that significantly impact the catalytic performance of a photocatalyst. Therefore, developing a reasonable method to enhance these aspects is a valuable strategy for creating efficient photocatalysts. In this study, we fabricated a donor–acceptor (D–A) structure by modifying graphitic phase carbon nitride (g-CN) nanosheets with 2-aminothiophene-3-carbonitrile (ACT). The introduction of ACT altered the dipole moment of g-CN and significantly extended the conjugated system of g-CN, thereby enhancing the n → π* electronic transition. These improvements in molecular dipole and conjugated system effectively enhanced the charge-transfer dynamics and light utilization efficiency. In addition, the introduction of ACT greatly improved the CO2 adsorption capacity of g-CN nanosheets. Experimental results showed that g-CN-ACT0.05 exhibited the best photocatalytic CO2 reduction performance, with a CO evolution rate of 8.27 μmol g–1 h–1, which was eight times higher than that of unmodified g-CN. This research serves as a reference for developing catalysts with high photocatalytic activity for CO2 reduction.

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A high-cyano groups-content amorphous-crystalline carbon nitride isotype heterojunction photocatalyst for high-quantum-yield H2 production and enhanced CO2 reduction

Cited by 90 publications

References 44 publications

Violet phosphorus quantum dots as an emerging visible light-responsive photocatalyst for an efficient hydrogen evolution reaction

Violet phosphorus quantum dots as an emerging visible light-responsive photocatalyst for an efficient hydrogen evolution reaction

Comparative study on K‐tolerance performance of Fe/ZrO₂ and Fe/ZrO₂‐W catalysts for NH₃‐SCR of NO_x

Graphitic Carbon Nitride Modified with 2-Aminothiophene-3-Carbonitrile to Boost Molecular Dipole and n → π* Electronic Transition for Photoreduction of Carbon Dioxide

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A high-cyano groups-content amorphous-crystalline carbon nitride isotype heterojunction photocatalyst for high-quantum-yield H2 production and enhanced CO2 reduction

Cited by 90 publications

References 44 publications

Violet phosphorus quantum dots as an emerging visible light-responsive photocatalyst for an efficient hydrogen evolution reaction

Violet phosphorus quantum dots as an emerging visible light-responsive photocatalyst for an efficient hydrogen evolution reaction

Comparative study on K‐tolerance performance of Fe/ZrO2 and Fe/ZrO2‐W catalysts for NH3‐SCR of NOx

Graphitic Carbon Nitride Modified with 2-Aminothiophene-3-Carbonitrile to Boost Molecular Dipole and n → π* Electronic Transition for Photoreduction of Carbon Dioxide

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Comparative study on K‐tolerance performance of Fe/ZrO₂ and Fe/ZrO₂‐W catalysts for NH₃‐SCR of NO_x