Scalable 2D Hierarchical Porous Carbon Nanosheets for Flexible Supercapacitors with Ultrahigh Energy Density

Lei Yao, Qin Wu, Peixin Zhang, Junmin Zhang, Dongrui Wang, Yongliang Li, Xiangzhong Ren, Hongwei Mi, Libo Deng, Zijian Zheng

Research output: Journal article publicationJournal articleAcademic researchpeer-review

247 Citations (Scopus)

Abstract

2D carbon nanomaterials such as graphene and its derivatives, have gained tremendous research interests in energy storage because of their high capacitance and chemical stability. However, scalable synthesis of ultrathin carbon nanosheets with well-defined pore architectures remains a great challenge. Herein, the first synthesis of 2D hierarchical porous carbon nanosheets (2D-HPCs) with rich nitrogen dopants is reported, which is prepared with high scalability through a rapid polymerization of a nitrogen-containing thermoset and a subsequent one-step pyrolysis and activation into 2D porous nanosheets. 2D-HPCs, which are typically 1.5 nm thick and 1–3 µm wide, show a high surface area (2406 m 2 g −1) and with hierarchical micro-, meso-, and macropores. This 2D and hierarchical porous structure leads to robust flexibility and good energy-storage capability, being 139 Wh kg −1 for a symmetric supercapacitor. Flexible supercapacitor devices fabricated by these 2D-HPCs also present an ultrahigh volumetric energy density of 8.4 mWh cm −3 at a power density of 24.9 mW cm −3, which is retained at 80% even when the power density is increased by 20-fold. The devices show very high electrochemical life (96% retention after 10000 charge/discharge cycles) and excellent mechanical flexibility.

Original languageEnglish
Article number1706054
JournalAdvanced Materials
Volume30
Issue number11
DOIs
Publication statusPublished - 15 Mar 2018

Keywords

  • 2D
  • carbon
  • flexible supercapacitor
  • graphitization
  • hierarchical pores

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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