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

11 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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