Graphitic nitrogen-doped hierarchical porous carbon nanosheets for supercapacitor application were derived from an easily obtained and green silk by simultaneous ZnCl 2 activation and FeCl 3 graphitization at different heating temperatures. By increasing the heating temperature from 700 to 850 C, the degree of graphitization and BET surface area rose to their highest levels, while the nitrogen doping content was maintained at 2.24 wt%.
Silk fibroin-based transient devices were developed using LiBr/wax microspheres that mimic a silk cocoon protecting silkworm pupa and a juvenile moth secreting an enzyme to dissolve silk sericin and break a silk cocoon.
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