In situ precipitation of Nickel-hexacyanoferrate within multi-walled carbon nanotube modified electrode and its selective hydrazine electrocatalysis in physiological pH

► In-situ chemical precipitation of nickel-hexacyanoferrate within multiwalled carbon nanotubes. ► Ni-NCFe@f-MWCNT characterization by XRD, XPS, FE-SEM, EDAX, TEM, CV. ► 'Edge-plane hole defects and oxygen functionality' mechanistic model for formation of Ni-NCFe@f-MWCNT. ► Highly stable, sensitive and selective amperometric sensing of hydrazine in physiological solutions.