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Binder-Free Activated Graphene Compact Films for All-Solid-State Micro-Supercapacitors with High Areal and Volumetric Capacitances
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Binder-Free Activated Graphene Compact Films for All-Solid-State Micro-Supercapacitors with High Areal and Volumetric Capacitances
Posted:2016-03-18 17:32    Column:2015
Z.-S. Wu, S. Yang, L. Zhang, J. B. Wagner, X. Feng*, K. Müllen*,
Energy Storage Materials 2015, 1: 119-126. 
DOI: 10.1016/j.ensm.2015.09.004  [PDF]

Abstract
Micro-supercapacitors (MSCs) hold great promise as highly competitive miniaturized power sources satisfying the increased demand in microelectronics; however, simultaneously achieving high areal and volumetric capacitances is still a great challenge. Here we demonstrated the designed construction of binder-free, electrically conductive, nanoporous activated graphene (AG) compact films for high-performance MSCs. The binder-free AG films are fabricated by alternating deposition of electrochemically exfoliated graphene (EG) and nanoporous AG with a high specific surface area of 2920 m2/g, and then dry transferring onto the target substrates with a high-pressure mechanical densification process. Remarkably, the resulting compressed AG films showed uniform morphology in lateral dimensions, high conductivity (60S/cm), nanoporous feature (<10 nm="" and="" high="" packing="" density="" 0="" 8="" g="" cm3="" the="" all-solid-state="" mscs="" ag-mscs="" based="" on="" these="" ag="" films="" simultaneously="" delivered="" an="" unprecedented="" areal="" capacitance="" of="" 89="" 5="" f="" cm2="" and="" volumetric="" capacitance="" of="" 147f="" cm3="" for="" mscs="" at="" 10mv="" s="" moreover="" the="" fabricated="" ag-mscs="" could="" be="" operated="" at="" a="" large="" scan="" rate="" of="" 10="" 000="" mv="" s="" and="" showed="" outstanding="" cycling="" stability="" capacitance="" retention="" of="">99.6% after 10,000 cycles). Our results suggested that AG-MSCs are competitive for prospective applications of miniaturized energy storage devices.

Dalian Institute of Chemical Physics, CAS
457 Zhongshan Road Dalian, China 116023
E-mail: wuzs@dicp.ac.cn
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