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Wood‐Derived Hierarchically Porous Electrodes for High‐Performance All‐Solid‐State Supercapacitors
Author(s) -
Wang Yameng,
Lin Xiangjun,
Liu Ting,
Chen Heng,
Chen Shuai,
Jiang Zhongjie,
Liu Jiang,
Huang Jianlin,
Liu Meilin
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201806207
Subject(s) - supercapacitor , materials science , anode , power density , capacitance , current density , energy storage , separator (oil production) , electrode , renewable energy , porosity , cathode , fabrication , current collector , chemical engineering , optoelectronics , nanotechnology , composite material , electrolyte , electrical engineering , power (physics) , chemistry , engineering , medicine , physics , alternative medicine , quantum mechanics , pathology , thermodynamics
The rapid development of many emerging technologies (e.g., electric vehicles and smart grids) requires advanced energy storage and conversion systems that have higher energy and power density, longer operational life, and better safety. A low‐cost, green, and sustainable process for fabrication of all‐solid‐state asymmetric supercapacitors (ASC) composed of a hierarchically porous carbonized wood (CW) anode, a cellulose paper separator, and a Co(OH) 2 @CW cathode is reported here. The hierarchically porous wood‐derived electrode exhibits a high areal capacitance of 3.723 F cm −2 (with an areal loading Co(OH) 2 of 5.7 mg cm −2 ) at a current density 1.0 mA cm −2 , and 1.568 F cm −2 at a current density of 30 mA cm −2 . Moreover, the all‐solid‐state ASC exhibits outstanding energy density of 0.69 mWh cm −2 (10.87 Wh kg −1 ) at power density of 1.126 W cm −2 (17.75 W kg −1 ) while maintaining a capacitance retention of 85% after 10 000 continuous charge–discharge cycles. The high energy/power‐densities are attributed to the unique architecture of the electrodes derived from natural wood, which allow full exposure of active electrode materials, efficient current collection, and fast ion transport. Further, the materials are renewable, environmentally friendly, and biodegradable.