Details

Autor(en) / Beteiligte

• Dianbudiyanto, Wahid
• Liu, Shou-Heng

Titel

Outstanding performance of capacitive deionization by a hierarchically porous 3D architectural graphene

Ist Teil von

• Desalination, 2019-10, Vol.468, p.114069, Article 114069

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2019

Quelle

ScienceDirect

Beschreibungen/Notizen

• To attain the optimal capacitive deionization (CDI) performance for brackish water desalination, an electrode should possess high electrical conductivity, large surface area, hierarchically porous carbons with three-dimensional (3D) interconnection which can provide efficient pathways for ion and electron transfer. Herein we demonstrate a novel route to prepare a hierarchically porous 3D architectural graphene by using a combination of microwave treatment and H2O2-assisted hydrothermal method. The physicochemical and electrochemical properties of prepared 3D porous graphene are identified by scanning/transmission electron microscopy, X-ray based spectroscopies, Raman, nitrogen adsorption-desorption, cyclic voltammetry and electrochemical impendence spectroscopy. The desalination tests are carried out by using a batch-mode CDI at 1.4 V in a 500 ppm NaCl solution. Experimental results show that 3D porous graphene has a superior specific capacitance (190 F g−1) and ultrahigh electrosorption capacity (21.58 mg g−1). This unique hierarchically porous 3D graphene which exhibits good electrical conductivity, efficient ion transport and lower charge transfer resistance could be one of promising electrodes for CDI in the practical applications. •A hierarchically porous 3D graphene was prepared by a facile and cost-effective route.•Hierarchical and 3D structure can be created by microwave and H2O2-hydrothermal treatments.•The CDI capacity of prepared samples can reach 21.58 mg g−1 at 1.4 V in a 500 ppm NaCl solution.•This is due to the higher mesoporosity, capacitance and unique 3D hierarchical structure.•The surpassing performance enables hierarchically 3D graphene practical applications.