Fig. 4From: Design of Double-Shelled CuS Nanocages to Optimize Electrocatalytic Dynamic for Sensitive Detection of Ascorbic Acida CVs of 2-CuS NCs/GCE, 1-CuS NCs, and bare GCE at 50 mV s−1. b The catalytic mechanism of AA oxidation on 2-CuS NCs/GCE. c Nyquist plot of 2-CuS NCs/GCE and 1-CuS NCs/GCE. d i-t response towards 25-μM AABack to article page