Mesoporous Co3O4 monolayer hollow-sphere array as electrochemical pseudocapacitor material

A Co3O4 monolayer hollow-sphere array with mesoporous walls exhibits high pseudocapacitances of 358 F g(-1) at 2 A g(-1) and 305 F g(-1) at 40 A g(-1), as well as excellent cycling stability for application as pseudocapacitors.