Fabrication of supercapacitors and flexible electrodes using biosilica from cultured diatoms

Emine S. Karaman, Zhiqian Wang, Giuseppe Di Benedetto, James L. Zunino, Xianyang Meng, Somenath Mitra

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Frustules of the cultured diatom (CD) with unique porous architecture and high surface area were used as template for electrodes. Iron oxide coating on cultured diatom (CD-FeOx) was carried out via hydrolysis and metathesis reaction of FeCl3, which allowed the uniform coating of the FeOx onto frustules. The relatively large surface area of CD contributed to double-layer capacitance, while the FeOx provided pseudocapacitance. Results showed that 51% loading of FeOx on CD significantly enhanced performance to 70.2 F g−1, which was much higher compared with CD only. Supercapacitors remained functional after 1000 cycles and maintained 90% of the original performance. The CD-FeOx composite was also successfully used to fabricate flexible supercapacitor electrodes.

Original languageEnglish (US)
Pages (from-to)166-173
Number of pages8
JournalMaterials Today Energy
StatePublished - Mar 2019

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science (miscellaneous)
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology


  • Algae
  • Diatom
  • Iron oxides
  • Supercapacitor


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