Implantable nonenzymatic glucose/O2 micro film fuel cells assembled with hierarchical AuZn electrodes.

Hierarchical AuZn dendrites revealed electrocatalytic properties towards the glucose oxidation and the four-electron O2 reduction. The micro fuel cell using AuZn electrodes generated a power density of 2.07 and 0.29 mW cm(-2) for glucose and human whole blood. The micro film fuel cell implanted into the rat brain produced ∼0.52 V continuously operating for more than 18 days.