Journal
JOURNAL OF POWER SOURCES
Volume 439, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2019.227046
Keywords
Exfoliated graphite; Double-phase electrochemical deposition; 3D electrode; Asymmetric supercapacitor; Graphene hydrogel
Funding
- National Natural Science Foundation of China [21576138, 51572127, 51702162]
- China-Israel Cooperative Program [2016YFE0129900]
- program for Science and Technology Innovative Research Team in Universities of Jiangsu Province, China
- China Postdoctoral Science Foundation [2018M632309]
- PBC Fellowship - Planning and Budgeting Committee of the Council for Higher Education in Israel
- PBC Fellowship - Hebrew University of Jerusalem
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Rechargeable energy storage systems with merits of durable, powerful, and inexpensive are urgently desired along with the rapid development in portable electronics and electric vehicles. Herein, a facile electrochemical method is employed to prepare a free-standing exfoliated graphite (EG) electrode with significantly enhanced surface area and pore volume. Then a binder-free composite electrode is fabricated by a double-phase (DP) electrochemical deposition of vertical arrays of Ni(OH)(2) throughout the EG hydrogel electrode in an organic electrolyte. The obtained composite, Ni(OH)(2)@EG-DP, exhibits battery-type capacitive behavior and much higher capacity than its counterparts fabricated either by single-phase electrochemical deposition or with non-exfoliated graphite foil. Ni(OH)(2)@EG-DP also exhibits remarkable rate capability and cycling stability, due to the well-dispersed ultrathin Ni(OH)(2) nanoplatelets and the graphene-like expanded gallery of EG, enabling the efficient transportation of both electrons and ions. When coupling with an active carbon anode, the assembled asymmetric supercapacitor shows 84.5% capacity retention after 20000 cycles at 8 A g(-1), and a high energy density of 34.7 Wh kg(-1) at the power density of 15 kW kg(-1). This work opens an avenue towards the efficient construction of free-standing three-dimensional (3D) conductive substrates and high-performance 3D hybrid electrodes using electrochemistry.
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