https://nova.newcastle.edu.au/vital/access/ /manager/Index en-au 5 Facile synthesis of graphene nanosheets from humic acid for supercapacitors https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:30947 2·g− 1) with large pore volume (2.987 cm3·g− 1), unique interconnected mesoporous structure and uniform oxygen-containing functional groups in layered graphene framework, which offer a favorable and efficient pathway for the electrolyte propagation and transportation. The electrodes of supercapacitors made from these graphene nanosheets exhibit a maximum specific capacitance of 272 F·g− 1 at the current density of 50 mA·g− 1 in aqueous electrolyte, and possess excellent rate capability, low resistance, superior cycling performance with over 96.5% initial capacitance retention after 8000 cycles. The corresponding supercapacitors deliver a desirable energy density of 6.47 Wh·kg− 1 at a powder density of 2250 W·kg− 1. This study demonstrates a promising synthesis route for large-scale production of graphene nanosheets from renewable and green humic acid for high performance supercapacitors]]> Sat 24 Mar 2018 07:33:41 AEDT ]]> Lignite-derived high surface area mesoporous activated carbons for electrochemical capacitors https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:26580 2·g-1) with a hierarchical macro-meso-micro-pore structure and oxygen-enriched surface. The electrochemical performances of the ACs as electrode materials for electrochemical capacitors (ECs) were assessed by galvanostatic charge-discharge, cyclic voltammetry and cycling durability tests. It was demonstrated that the mesoporous ACs produced in this study possessed a maximum specific capacitance of 355F·g-1 and 196F·g-1 in 3M KOH aqueous and 1M (C₂H₅)₄NBF₄/PC organic electrolytes, respectively, at a current density of 50mA·g-1, and exhibited a desirable energy and power density with a superior cycling performance. The excellent capacitive behavior of the prepared mesoporous ACs in aqueous system is attributed to their unique macro-meso-micro-hierarchical pore structure with high surface area and oxygen-containing surface. Their superb electrochemical performance in the organic electrolyte is attributed to their well-developed mesoporous structure.]]> Sat 24 Mar 2018 07:26:12 AEDT ]]> Microwave synthesis of hierarchically porous activated carbon from lignite for high performance supercapacitors https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:23986 Sat 24 Mar 2018 07:10:21 AEDT ]]> Green synthesis of porous graphitic carbons from coal tar pitch templated by nano-CaCO₃ for high-performance lithium-ion batteries https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:42583 Fri 26 Aug 2022 08:16:36 AEST ]]>