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Sci Rep. 2015 Jan 13;5:7736. doi: 10.1038/srep07736.

Flagellar filament bio-templated inorganic oxide materials - towards an efficient lithium battery anode.

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Institute of Protein Research, Russian Academy of Sciences, 142290 Pushchino, Russia.
Department of Energy Science and Engineering, Indian Institute of Technology Bombay, Powai 400076 Mumbai, India.
Department of Chemical Engineering, Indian Institute of Technology Bombay, Powai, 400076 Mumbai, India.
Australian Center of Excellence for Electromaterials Science, School of Chemistry, Monash University, Clayton, Victoria 3800, Australia.


Designing a new generation of energy-intensive and sustainable electrode materials for batteries to power a variety of applications is an imperative task. The use of biomaterials as a nanosized structural template for these materials has the potential to produce hitherto unachievable structures. In this report, we have used genetically modified flagellar filaments of the extremely halophilic archaea species Halobacterium salinarum to synthesize nanostructured iron oxide composites for use as a lithium-ion battery anode. The electrode demonstrated a superior electrochemical performance compared to existing literature results, with good capacity retention of 1032 mAh g(-1) after 50 cycles and with high rate capability, delivering 770 mAh g(-1) at 5 A g(-1) (~5 C) discharge rate. This unique flagellar filament based template has the potential to provide access to other highly structured advanced energy materials in the future.

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