Graphene Coupled Schiff-base Porous Polymers: Towards Nitrogen-enriched Porous Carbon Nanosheets with Ultrahigh Electrochemical Capacity

XiaodongZhuang, Fan Zhang,* Dongqing Wu, and Xinliang Feng.*

Adv. Mater. 2014, 26(19): 3081-3086.


Porous polymers with porosity at the nano-scale have attracted tremendous attention because of their porous features associated with prominent physical properties and potential applications,such as in light harvesting, sensing, gas separation and storage, catalysis, and energy storage and conversion. Schiff-base chemistry is one of the most popular choices for constructing porous organic materials, such as porous organic cages, crystalline COFs, and amorphous organic networks.However, the morphology control of Schiff-base-type porous polymers remains largely unexplored.In thiswork, we present a graphene-directed synthesis for the large-scale production of Schiff-base-type 2D porous polymer (TPP) nanosheets based on commercially  available and inexpensive monomers, that is, melamine and aromatic dialdehydes, such as 1,3-phthalaldehyde, 1,4-phthalaldehyde, 2,5-thiophenedialdehyde, and 4,4’-biphenyldialdehyde.The resulting TPP sheets possess a high nitrogen content (up to 43.9 wt%), single-sheet morphology,  and  large  specifi c  surface  area  up  to  around 762 m2g −1.The as-prepared TPC-1, obtained by thermal treatment at 800°C, exhibits ultrahigh specifi c capacitance up to 424 Fg−1 at 0.1 Ag−1 in 6M KOH, superior to the pyrolyzed porous carbons obtained from Schiff-base porous polymers without involvement of graphene and many reported graphene and nitrogen-doped porous carbon materials.