Electrospun nitrogen-doped carbon/transition metal oxide fibres for capacitive deionisation of saline water.

Triolo C., Pantò F., Frontera P., Stelitano S., Fernández-Carretero F., Rincon I., Azpiroz P., Garcia-Luis A., Belaustegui Y., Santangelo S.

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Composite $C:N/MO_x$ fibres are produced by electrospinning and utilised to prepare electrodes for the capacitive deionisation (CDI) of saline water. The fibres morphology depends on the transition metal (Mn, Fe, Ti or Zn) and, together with the relative amount of the surface species (N and C-bonded O) and the specific micropore volume, has strong impact on the effective areal capacitance of the CDI electrodes. Since ion storage in the composite materials occurs via a mixed capacitive/pseudocapacitive process, increasing the $MO_x$ content of the fibres partly compensates for the growing hindrance to diffusion encountered by the ions at higher scan rates.

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