| abstract |
The invention provides a two-dimensional carbon nanosheet whose thickness can be precisely controlled and a preparation method thereof. The thickness of the precisely regulated carbon nanosheet can be precisely regulated from 5.1 nm to 92.3 nm, and has high specific surface area and uniform distribution at the atomic level. of intrinsic nitrogen doping. The preparation method comprises the following steps: using 4,4'-biphenylenediamine and 1,2,4,5-pyromellitic dianhydride as monomers, and using stepwise polymerization to form an amphiphilic alternating copolymer. Using the amphiphilic alternating copolymer as an assembly unit, the intramolecular imidization reaction is used to induce the amphiphilic alternating copolymer to undergo crystallization-driven self-assembly to form polymer nanosheets with precisely controllable thickness. Two-dimensional carbon nanosheets with precisely controllable thickness can be obtained by calcining the polymer nanosheets in an inert atmosphere. The two-dimensional carbon nanosheets have high specific surface area and atomically uniform distribution of intrinsic nitrogen doping, can be used as a catalyst for electrocatalytic oxygen reduction, exhibit excellent electrocatalytic performance, and can be used as a catalyst for fuel cells. |