Ultrahigh-rate-capability of a layered double hydroxide supercapacitor based on a self-generated electrolyte reservoir

A supercapacitor based on hierarchical OH⁻-containing CoAl layered double hydroxide (LDH) arrays exhibits excellent energy and power output, especially an ultrahigh-rate-capability, which is attributed to the self-generated electrolyte (OH⁻) reservoir in the LDH gallery.