title: Scalable Fabrication of Photochemically Reduced Graphene-Based Monolithic Micro-Supercapacitors with Superior Energy and Power Densities.
abstract: Micro-supercapacitors (MSCs) hold great promise as highly competitive miniaturized power sources satisfying the increased demand of smart integrated electronics. However, single-step scalable fabrication of MSCs with both high energy and power densities is still challenging. Here we demonstrate the scalable fabrication of graphene-based monolithic MSCs with diverse planar geometries and capable of superior integration by photochemical reduction of graphene oxide/TiO2nanoparticle hybrid films. The resulting MSCs exhibit high volumetric capacitance of 233.0 F cm-3, exceptional flexibility, and remarkable capacity of modular serial and parallel integration in aqueous gel electrolyte. Furthermore, by precisely engineering the interface of electrode with electrolyte, these monolithic MSCs can operate well in a hydrophobic electrolyte of ionic liquid (3.0 V) at a high scan rate of 200 V s-1, two orders of magnitude higher than those of conventional supercapacitors. More notably, the MSCs show landmark volumetric power density of 312 W cm-3and energy density of 7.7 mWh cm-3, both of which are among the highest values attained for carbon-based MSCs. Therefore, such monolithic MSC devices based on photochemically reduced, compact graphene films possess enormous potential for numerous miniaturized, flexible electronic applications.
authors.affiliation: Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , 457 Zhongshan Road, Dalian 116023, PR China.|University of Chinese Academy of Sciences , 19 A Yuquan Road, Shijingshan District, Beijing 100049, PR China.
authors.forename: Sen
authors.initials: S
authors.lastname: Wang
authors.affiliation: Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , 457 Zhongshan Road, Dalian 116023, PR China.
authors.forename: Zhong-Shuai
authors.identifier: 0000-0003-1851-4803
authors.initials: ZS
authors.lastname: Wu
authors.affiliation: Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , 457 Zhongshan Road, Dalian 116023, PR China.|University of Chinese Academy of Sciences , 19 A Yuquan Road, Shijingshan District, Beijing 100049, PR China.|State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , 457 Zhongshan Road, Dalian 116023, PR China.
authors.forename: Shuanghao
authors.initials: S
authors.lastname: Zheng
authors.affiliation: Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , 457 Zhongshan Road, Dalian 116023, PR China.
authors.forename: Feng
authors.initials: F
authors.lastname: Zhou
authors.affiliation: Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , 457 Zhongshan Road, Dalian 116023, PR China.
authors.forename: Chenglin
authors.initials: C
authors.lastname: Sun
authors.affiliation: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences , 72 Wenhua Road, Shenyang 110016, PR China.|Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University , 1001 Xueyuan Road, Shenzhen 518055, PR China.
authors.forename: Hui-Ming
authors.initials: HM
authors.lastname: Cheng
authors.affiliation: Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , 457 Zhongshan Road, Dalian 116023, PR China.|State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , 457 Zhongshan Road, Dalian 116023, PR China.
authors.forename: Xinhe
authors.identifier: 0000-0001-9404-6429
authors.initials: X
authors.lastname: Bao
keywords: energy storage; graphene; micro-supercapacitors; monolithic; photochemical reduction; supercapacitors