Flower-like Copper Cobaltite Nanosheets on Graphite Paper as High-Performance Supercapacitor Electrodes and Enzymeless Glucose Sensors

Shude Liu, K.S. Hui, K. N. Hui

Research output: Contribution to journalArticlepeer-review

236 Citations (Scopus)

Abstract

Flower-like copper cobaltite (CuCo2O4) nanosheets anchored on graphite paper have been synthesized using a facile hydrothermal method followed by a postannealing treatment. Supercapacitor electrodes employing CuCo2O4 nanosheets exhibit an enhanced capacitance of 1131 F g-1 at a current density of 1 A g-1 compared with previously reported supercapacitor electrodes. The CuCo2O4 electrode delivers a specific capacitance of up to 409 F g-1 at a current density of as high as 50 A g-1, and a good long-term cycling stability, with 79.7% of its specific capacitance retained after 5000 cycles at 10 A g-1. Furthermore, the as-prepared CuCo2O4 nanosheets on graphite paper can be fabricated as electrodes and used as enzymeless glucose sensors, which exhibit good sensitivity (3.625 μA μM-1 cm-2) and an extraordinary linear response ranging up to 320 μM with a low detection limit (5 μM).

Original languageEnglish
Pages (from-to)3258-3267
Number of pages10
JournalACS Applied Materials & Interfaces
Volume8
Issue number5
DOIs
Publication statusPublished - 13 Jan 2016

Keywords

  • copper cobaltite
  • glucose sensor
  • hydrothermal method
  • nanosheets
  • supercapacitors

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