Prussian blue/RGO with less coordinated water as superior cathode material for sodium-ion batteries†
Abstract
A micro-cubic Prussian blue (PB) with less coordinated water is first developed by electron exchange between graphene oxide and PB. The obtained reduced graphene oxide–PB composite exhibited increased redox reactions of the Fe sites and delivered ultrahigh specific capacity of 163.3 mA h g−1 (30 mA g−1) as well as excellent cycle stability as a cathode in sodium-ion batteries.