Photocatalysis-Assisted Co3O4/g-C3N4 p–n Junction All-Solid-State Supercapacitors: A Bridge between Energy Storage and Photocatalysis

Liqi Bai, Hongwei Huang, Songge Zhang, Lin Hao, Zhili Zhang, Hongfen Li, Li Sun, Lina Guo, Haitao Huang, Yihe Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

72 Citations (Scopus)


Supercapacitors with the advantages of high power density and fast discharging rate have full applications in energy storage. However, the low energy density restricts their development. Conventional methods for improving energy density are mainly confined to doping atoms and hybridizing with other active materials. Herein, a Co3O4/g-C3N4 p–n junction with excellent capacity is developed and its application in an all-solid-state flexible device is demonstrated, whose capacity and energy density are considerably enhanced by simulated solar light irradiation. Under photoirradiation, the capacity is increased by 70.6% at the maximum current density of 26.6 mA cm−2 and a power density of 16.0 kW kg−1. The energy density is enhanced from 7.5 to 12.9 Wh kg−1 with photoirradiation. The maximum energy density reaches 16.4 Wh kg−1 at a power density of 6.4 kW kg−1. It is uncovered that the lattice distortion of Co3O4, reduces defects of g-C3N4, and the facilitated photo-generated charge separation by the Co3O4/g-C3N4 p–n junction all make contributions to the promoted electrochemical storage performance. This work may provide a new strategy to enhance the energy density of supercapacitors and expand the application range of photocatalytic materials.

Original languageEnglish
Article number2001939
JournalAdvanced Science
Issue number22
Publication statusPublished - 18 Nov 2020


  • built-in electric field
  • carbon nitride
  • energy storage materials
  • photocatalysis
  • p–n junction
  • supercapacitors

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Chemical Engineering(all)
  • Biochemistry, Genetics and Molecular Biology (miscellaneous)
  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)


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