Fig. 5. Self-healing batteries and electrochemical sensors.

(A) Recovery of the current output for a self-healing Zn-Ag₂O battery after every 3-mm-wide damage. (B) Photographs showing the self-healing battery at different steps of the damage-heal cycle. (C) Inability of a control (nonhealing CB ink–based) Zn-Ag₂O battery to recover current output after the first damage. (D) Photographs showing the control battery at different steps of the damage-heal cycle. Amperometric and voltammetric response of self-healing (E) H₂O₂ and (F) Cu sensors, respectively, for increasing concentrations of H₂O₂ (0 to 20 mM) and Cu [0 to 25 parts per million (ppm)] under repeated 1-mm-wide damage.