Facile synthesis of novel graphene sponge for high performance capacitive deionization

摘要: Capacitive deionization (CDI) is an effective desalination technique offering appropriate route to obtain clean water. In order excellent CDI performance, a rationally designed structure of electrode materials has been urgent need for application. this work, novel graphene sponge (GS) was proposed as the first time. The GS fabricated via directly freeze-drying oxide solution followed by annealing in nitrogen atmosphere. morphology, and electrochemical performance were characterized scanning electron microscopy, Raman spectroscopy, adsorption-desorption, X-ray photoelectron cyclic voltammetry impedance spectroscopy. electrosorption NaCl studied compared with pristine (PG). results show that due unique 3D interconnected porous structure, large accessible surface area low charge transfer resistance, exhibits ultrahigh capacity 14.9 mg g−1 when initial concentration ~500 mg L−1, which about 3.2 times PG (4.64 mg g−1) our knowledge, it should be highest value reported electrodes similar experimental conditions now. These indicate promising candidate electrode.