Boosted built-in electric field and active sites based on Ni-doped heptazine/triazine crystalline carbon nitride for achieving high-efficient photocatalytic H2 evolution

Shi, Weilong; Cao, Longwen; Shi, Yan; Zhong, Wenhe; Chen, Zhouze; Wei, Yanyan; Guo, Feng; Chen, Lizhuang; Du, Xin

doi:10.1016/j.molstruc.2023.135076

Cited by 32 publications

(11 citation statements)

References 82 publications

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“…As such, the isotype heterojunction formed between the heptazine/triazine units with interleaved band gaps aids in the interfacial charge transfer. 59…”

Section: Resultsmentioning

confidence: 99%

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Isotype heterojunction: tuning the heptazine/triazine phase of crystalline nitrogen-rich C₃N₅ towards multifunctional photocatalytic applications

Ng,

Foo,

Ong

2024

Mater. Horiz.

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“…As such, the isotype heterojunction formed between the heptazine/triazine units with interleaved band gaps aids in the interfacial charge transfer. 59…”

Section: Resultsmentioning

confidence: 99%

“…As such, the isotype heterojunction formed between the heptazine/triazine units with interleaved band gaps aids in the interfacial charge transfer. 59 X-ray photoelectron spectroscopy (XPS) analysis was conducted on CC3N5-500 to further confirm its surface compositions and elemental chemical state (Fig. 4).…”

Section: Wee-jun Ongmentioning

confidence: 99%

Isotype heterojunction: tuning the heptazine/triazine phase of crystalline nitrogen-rich C₃N₅ towards multifunctional photocatalytic applications

Ng,

Foo,

Ong

2024

Mater. Horiz.

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“…The projected density of states (pDOS) calculations (Figure S9) also show that the total energy curves of the HOMO and LUMO of THCN are similar to those of the HOMO of HCN and the LUMO of TCN, respectively, demonstrating the formation of a homojunction . The discrepancy between the experimental and DFT-calculated band gap of CN materials has been thoroughly investigated , and confirms that the formation of a homojunction is possible.…”

Section: Resultsmentioning

confidence: 99%

Enhancing the Activity of a Carbon Nitride Photocatalyst by Constructing a Triazine–Heptazine Homojunction

Xia,

Mark,

Tong

et al. 2024

Inorg. Chem.

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Establishing homojunctions at the molecular level between different but physicochemically similar phases belonging to the same family of materials is an effective approach to promoting the photocatalytic activity of polymeric carbon nitride (CN) materials. Here, we prepared a CN material with a uniform distribution of homojunctions by combining two synthetic strategies: supramolecular assemblies as the precursor and molten salt as the medium. We designed porous CN rods with triazine–heptazine homojunctions (THCNs) using a melem supramolecular aggregate (Me) and melamine as the precursors and a KCl/LiBr salt mixture as the liquid reaction medium. The triazine/heptazine ratio is controlled by varying the relative amounts of the chosen precursors, and the molten salt treatment enhances the structural order of the interplanar packing units for the THCN skeleton, leading to rapid charge migration. The resulting built-in electric field induced by the triazine–heptazine homojunction enhances photogenerated charge separation; the optimal THCN catalyst exhibits an excellent H2 evolution rate via photocatalytic water splitting, which is ∼24 times as high as that of reference bulk CN, with long-term stability.

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“…Cocatalyst modification is considered a widely effective way to enhance the hydrogen evolution activity, and especially noble metal nanoparticles (NPs) (like Pt, Au, Ag, Pd, Ru, etc.) as cocatalysts have drawn many researchers’ attention owing to their good conductivity to facilitate photoexcited charge separation. − Different from monometallic NPs, bimetallic NPs indicate the regulated electronic structure and superior photocatalytic performance resulting from their synergetic effects (such as NiCu, CuRu, AuAg, PtCu, and CuPd). − In particular, Pt facilitates the efficient separation of photogenerated charges, enhancing the dynamic processes in photocatalytic reactions. However, the high cost and limited availability of Pt-based catalysts impose practical constraints on their widespread application .…”

Section: Introductionmentioning

confidence: 99%

PtCu Alloy-Modified Triptycene-Based Polymer with Charge Separation for Photocatalytic Hydrogen Evolution from Water/Seawater

Zhang,

Li,

Peng

et al. 2024

Inorg. Chem.

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Direct photocatalytic hydrogen from earth-abundant seawater is a great potential way to achieve sustainable and clean energy, yet unsatisfactory decomposition and rapid electron−hole pair recombination of catalysts hinder the solar-driven H 2 conversion efficiency. Herein, we designed a series of PtCu alloy nanoparticlemodified porous triptycene-based polymers (Pt x Cu 1 -TCP) to construct the heterostructure for highly efficient hydrogen generation from photocatalytic water/seawater splitting. Characterizations displayed that TCP with an ultrahigh surface area can confine the agglomeration of PtCu alloy; meanwhile, the PtCu alloy can facilitate the rapid electron transfer from TCP. In addition, TCP with a stable covalent bond structure can resist the corrosion of seawater. Benefiting from these two advantages, Pt 7 Cu 1 -TCP showed a remarkably enhanced photocatalytic performance with a maximum H 2 evolution rate of 3255 μmol g −1 h −1 in natural seawater with triethanolamine, which is 2.69, 116.25, and 1.08 times that of Pt-TCP, Cu-TCP, and optimal catalyst in pure water, respectively. This study provides an idea for the development of a novel catalytic system for hydrogen production from solar-driven water/seawater splitting.

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Boosted built-in electric field and active sites based on Ni-doped heptazine/triazine crystalline carbon nitride for achieving high-efficient photocatalytic H2 evolution

Cited by 32 publications

References 82 publications

Isotype heterojunction: tuning the heptazine/triazine phase of crystalline nitrogen-rich C₃N₅ towards multifunctional photocatalytic applications

Isotype heterojunction: tuning the heptazine/triazine phase of crystalline nitrogen-rich C₃N₅ towards multifunctional photocatalytic applications

Enhancing the Activity of a Carbon Nitride Photocatalyst by Constructing a Triazine–Heptazine Homojunction

PtCu Alloy-Modified Triptycene-Based Polymer with Charge Separation for Photocatalytic Hydrogen Evolution from Water/Seawater

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Boosted built-in electric field and active sites based on Ni-doped heptazine/triazine crystalline carbon nitride for achieving high-efficient photocatalytic H2 evolution

Cited by 32 publications

References 82 publications

Isotype heterojunction: tuning the heptazine/triazine phase of crystalline nitrogen-rich C3N5 towards multifunctional photocatalytic applications

Isotype heterojunction: tuning the heptazine/triazine phase of crystalline nitrogen-rich C3N5 towards multifunctional photocatalytic applications

Enhancing the Activity of a Carbon Nitride Photocatalyst by Constructing a Triazine–Heptazine Homojunction

PtCu Alloy-Modified Triptycene-Based Polymer with Charge Separation for Photocatalytic Hydrogen Evolution from Water/Seawater

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Product

Resources

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Isotype heterojunction: tuning the heptazine/triazine phase of crystalline nitrogen-rich C₃N₅ towards multifunctional photocatalytic applications

Isotype heterojunction: tuning the heptazine/triazine phase of crystalline nitrogen-rich C₃N₅ towards multifunctional photocatalytic applications