2015 Volume 83 Issue 5 Pages 354-356
Iron/carbon nano-fiber composite electrodes on the basis of Fe3+ but containing Fe2+ or Ni2+ ions have been prepared via sol-gel precipitation. The influence of the Fe2+ doping on the nano-structure and the utility of iron in alkaline electrolyte has been confirmed. The mixing of Fe2+ in composite provides larger iron oxide particles with high crystallinity, and changes the specific capacity of composite electrode. The specific capacity of the composite electrode introducing Fe2+:Fe3+ at 4:1 increases about 1.4 times compared with analogue having only Fe3+. In contrast, the doping of Ni2+ in the composite reduces the iron utility.