Scalable preparation of g-C3N4 nanosheets and quantum dots for metal anode protection and nitrogen reduction

用于金属阳极保护和氮还原的 g-C3N4 纳米片和量子点的可扩展制备

• 批准号: 571058-2021
• 负责人: Li, Zhi
• 金额: $ 3.64万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=729011
• 关键词: Scalable; preparation; C3N4; nanosheets; quantum

Graphitic carbon nitride (g-C3N4) is an emerging 2D semiconductor consisting of C and N, connected via tris-triazine-based patterns. It is analogous to N-doped graphene but with much higher N content and well-defined trigonal sub-nano pores (~ 0.7 nm). Its unique and tunable optical, chemical, and catalytic properties, alongside its low price and high stability to oxidation (up to 500C), make it a attractive material for numerous applications, including in photo- and electro-catalysis, rechargeable batteries, solar cells, ultrafiltration, and super hard coating. Compared to graphene already in commercial production, 2D g-C3N4 nanomaterials are still in the early stage of development and provide tremendous commercialization opportunities. Typically, g-C3N4 is synthesized through the polymerization and calcination of melamine monomer at high temperatures. We recently introduced a supramolecular assembly concept in the synthesis. Namely, other nitrogen-containing monomers were first assembled into supramolecular together with melamine and then calcined into g-C3N4 with precise structure control. The resulting g-C3N4 quantum dots and g-C3N4 nanosheets can significantly improve the stability of Li and Zn metal anodes, which paves the road for long cycle life Li-ion and Zn-ion batteries for electric vehicles and stationary energy storage. In our preliminary test, g-C3N4 can serve as a photocatalyst to reduce nitrogen into ammonia, potentially leading to green fertilizer. Herein, we propose to design a scalable procedure to fabricate g-C3N4 nanomaterials with precisely controlled electronic and porous structures for battery and nitrogen-reduction applications. Theoretical modeling will be conducted to guide the design. We are expecting a ready-to-commercialize g-C3N4-based additive to improve the cycle-life batteries and a promising g-C3N4 photoelectrocatalyst to synthesis green fertilizer for Alberta agriculture at the end of the project. In the future, the same concept will be adapted to many other applications, e.g., selectively separating lithium in Alberta oil and gas brine.

石墨氮化碳 (g-C3N4) 是一种新兴的二维半导体，由 C 和 N 组成，通过基于三嗪的图案连接。它类似于氮掺杂石墨烯，但具有更高的氮含量和明确的三角形亚纳米孔（~ 0.7 nm）。其独特且可调节的光学、化学和催化性能，加上其低廉的价格和高氧化稳定性（高达 500C），使其成为众多应用领域极具吸引力的材料，包括光催化和电催化、可充电电池、太阳能电池、超滤和超硬涂层。与已经商业化生产的石墨烯相比，2D g-C3N4 纳米材料仍处于开发的早期阶段，并提供了巨大的商业化机会。通常，g-C3N4是通过三聚氰胺单体在高温下聚合和煅烧合成的。我们最近在合成中引入了超分子组装概念。即首先将其他含氮单体与三聚氰胺一起组装成超分子，然后煅烧成结构精确控制的g-C3N4。由此产生的g-C3N4量子点和g-C3N4纳米片可以显着提高Li和Zn金属负极的稳定性，这为电动汽车和固定储能的长循环寿命锂离子和锌离子电池铺平了道路。在我们的初步测试中，g-C3N4 可以作为光催化剂，将氮还原成氨，有可能产生绿色肥料。在此，我们建议设计一种可扩展的程序来制造具有精确控制的电子和多孔结构的 g-C3N4 纳米材料，用于电池和氮还原应用。将进行理论建模来指导设计。我们期待在项目结束时推出一种可商业化的基于 g-C3N4 的添加剂，以提高电池的循环寿命，并期待一种有前途的 g-C3N4 光电催化剂，用于为艾伯塔省农业合成绿色肥料。未来，相同的概念将适用于许多其他应用，例如选择性分离阿尔伯塔省石油和天然气盐水中的锂。