Porous carbon cubes decorated with cobalt nanoparticles for oxygen evolution catalysis in Zn-air batteries

Gwang Hee Lee, Heewon Yoo, Dong Wan Kim

Research output: Contribution to journalArticlepeer-review


For commercialization of zinc-air batteries, it is important to replace expensive noble metal catalysts with inexpensive carbonaceous materials. Herein, an efficient oxygen evolution reaction (OER) catalyst composed of a unique porous tunnel carbon cube and cobalt nanoparticles (Co@NPCC) was fabricated to facilitate oxygen diffusion and create electron conduction networks. As an OER catalyst for zinc-air batteries (ZABs), the resulting Co@NPCC demonstrate enhanced OER activity, similar to that of the benchmark RuO2. In OER performance, Co@NPCC exhibits the excellent mass activity of 49.9 mA mg−1 at overpotential (η) of 0.47 V and the high current density of 91.5 mA cm−2 at 1.75 V (vs RHE), compared to commercial RuO2 catalysts. The use of Co@NPCC as the OER catalyst for ZAB maintains stable charge overpotential with as little as 0.05 V variation during 250 cycles, which extends the stable discharge-charge cycle performance compared to RuO2. This work highlights a facile approach to fabricate OER catalysts without noble metals for enabling stable charge state and long life ZABs.

Original languageEnglish
Pages (from-to)6755-6765
Number of pages11
JournalInternational Journal of Energy Research
Issue number5
Publication statusPublished - 2022 Apr


  • cobalt nanoparticle
  • oxygen evolution reaction
  • porous carbon cube
  • zinc-air battery

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology


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