期刊:ACS applied nano materials [American Chemical Society] 日期:2018-08-13卷期号:1 (9): 4998-5007被引量:40
标识
DOI:10.1021/acsanm.8b01125
摘要
We develop a novel strategy to fabricate nitrogen-rich porous carbon nanosheets (N-PCNs) using Schiff-base/resin copolymer under hypersaline medium. Melamine-terephthalaldehyde Schiff-base containning high-bond-energy C=N covalent bonds effectively reduces the loss of the N species during carbonization and thus provides high nitrogen dopants, while the introduction of melamine-formaldehyde resin and ZnCl2 as a solubility enhancing stabilizer plays a key synergistic effect in making the formation of stable polymeric network. Besides, ZnCl2 also serves as a salt-templating and a foaming agent. The resultant N-PCNs have a rich N-doping of 6.55 wt %, a unique nanosheet morphology with a thickness of ∼200 nm, and a large surface area of 1403 m2 g–1 along with rational porous architecture, which affords superior electrochemical performances for a supercapacitor electrode such as high gravimetric capacitances of 362 and 268 F g–1 at 2.0 A g–1 in a three-electrode and a two-electrode system, respectively, using K...