In-situ growth of Cu@CuFe Prussian blue based core-shell nanowires for non-enzymatic electrochemical determination of ascorbic acid with high sensitivity and reusability

•Core-shell nanowires of Cu@PBA was in-situ fabricated via a novel electrodeposition route.•Cu provided high electrocatalysis and electron transfer rate and was protected by PBA.•The as-prepared AA sensor showed an ultra-low detection limit and ultra-wide linear range.•Excellent anti-interference ability and stability support its practical applications.