Au-loaded alkali metal-modified crystalline carbon nitride for photocatalytic nitrogen fixation

IF 5.5 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Carbon Letters Pub Date : 2024-06-04 DOI:10.1007/s42823-024-00755-9

Mimi Luo, Baibing Wang, Jiahui Shao, Yupeng Yan, Guanjie Jiang, Qin Zhang, Yang Li

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Abstract

Crystalline heptazine carbon nitride (HCN) is an ideal photocatalyst for photocatalytic ammonia synthesis. However, the limited response to visible light has hindered its further development. As a noble metal, Au nanoparticles (NPs) can enhance the light absorption capability of photocatalysts by the surface plasmon resonance (SPR) effect. Therefore, a series of Au NPs-loaded crystalline carbon nitride materials (AH) were prepared for photocatalytic nitrogen fixation. The results showed that the AH displayed significantly improved light absorption and decreased recombination rate of photo-generated carriers owing to the introduction of Au NPs. The optimal 2AH (loaded with 2 wt% Au) sample demonstrated the best photocatalytic performance for ammonia production with a yield of 70.3 μmol g⁻¹ h⁻¹, which outperformed that of HCN. This can be attributed to the SPR effect of Au NPs and alkali metal of HCN structure. These findings provide a theoretical basis for studying noble metal-enhanced photocatalytic activity for nitrogen fixation and offer new insights into advances in efficient photocatalysts.

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用于光催化固氮的金负载碱金属改性结晶氮化碳

结晶氮化庚嗪（HCN）是光催化合成氨的理想光催化剂。然而，其对可见光的响应有限，阻碍了其进一步发展。作为一种贵金属，金纳米粒子（NPs）可以通过表面等离子共振（SPR）效应增强光催化剂的光吸收能力。因此，研究人员制备了一系列负载金纳米粒子的结晶氮化碳材料（AH），用于光催化固氮。结果表明，由于引入了 Au NPs，AH 显著提高了光吸收能力，降低了光生载流子的重组率。最佳的 2AH（负载 2 wt% 金）样品在合成氨生产中表现出最佳的光催化性能，产氨量为 70.3 μmol g-1 h-1，优于 HCN。这可归因于金纳米粒子和 HCN 结构中碱金属的 SPR 效应。这些发现为研究贵金属增强的固氮光催化活性提供了理论基础，并为高效光催化剂的发展提供了新的见解。

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来源期刊

Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

7.30

自引率

20.00%

发文量

118

期刊介绍： Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.