• 文献标题:   Synthesis and Electrochemical Studies of 3D Reduced Graphene Oxide for Efficient Energy Storage
  • 文献类型:   Article
  • 作  者:   THIRUPPATHI AR, VAN DER ZALM J, HUNG CK, CHEN AC
  • 作者关键词:   threedimensional nanostructure, supercapacitor, reduced graphene oxide, interconnected structure, energy storage
  • 出版物名称:   ACS APPLIED ENERGY MATERIALS
  • ISSN:   2574-0962
  • 通讯作者地址:  
  • 被引频次:   0
  • DOI:   10.1021/acsaem.3c00595
  • 出版年:   2023

▎ 摘  要

Three-dimensional (3D) graphene-based materials are highlydesirablefor supercapacitor applications; however, their synthesis requiresmultiple time-consuming steps that involve templates and cross-linkers.Thus, chemically derived graphene through the reduction of grapheneoxide is preferred for scalable synthesis. Here, a facile one-potwet chemical synthesis for an improved highly interconnected 3D reducedgraphene oxide (3D-rGO) was developed where the extent of oxidationand the temperature for reduction were optimized. These facile interconnectedstructures were achieved through covalent linkages via functionalgroups. The optimized 3D-rGO demonstrated a high C/O ratio (5.2) andnominal defect density (I (D)/I (G) = 0.90) due to its stable structure. Electrochemicalcharacterization revealed that the 3D-rGO possessed a superior specificcapacitance of 256 F g(-1) in an aqueous electrolyte.Trasatti analysis revealed an 84% contribution from the electricaldouble-layer (EDL) mechanism, which implied a high sp(2) carboncontent and superior conductivity. This superb performance, whichwas further validated in a quasi-solid-state device in an aqueousgel electrolyte (H2SO4-PVA), revealing thatan excellent gravimetric energy density of 24.4 Wh kg(-1) could be delivered at a power density of 1 kW kg(-1). A maximum power density of 28 kW kg(-1) delivereda stable 18.8 Wh kg(-1) of energy. Furthermore, thesupercapacitor exhibited 184 F g(-1), with a capacityretention of 91% following 10,000 cycles at 10 A g(-1), which is promising for practical energy storage applications.