Constructing an Al2O3/(NH4)2V4O9 heterostructure as a cathode material for high performance aqueous rechargeable zinc ion batteries

The presence of an appropriate amount of Al 2 O 3 makes NH 4 V 4 O 10 change into a mixture of NH 4 V 4 O 9 and Zn 3 (OH) 2 V 2 O 7 ·2H 2 O to act as an active cathode for high capacity aqueous zinc ion batteries during the cycling process.