A Novel Type of Battery-Supercapacitor Hybrid Device with Highly Switchable Dual Performances Based on a Carbon Skeleton/Mg 2 Ni Free-Standing Hydrogen Storage Electrode.
ACS applied materials & interfaces(2017)
摘要
The sharp proliferation of high power electronics and electrical vehicles has promoted growing demands for power sources with simultaneous performances of high energy and power densities. Under the circumstances, battery-supercapacitor hybrid devices are attracting considerable attention as they combine the advantages of both batteries and supercapacitors. Here, a novel type of hybrid device based on carbon skeleton / Mg2Ni free-standing electrode without the traditional nickel foam current collector is reported, which has been designed and fabricated through a dispersing-freeze drying method by employing the reduced graphene oxide (rGO) and multi-walled carbon nanotubes (MWCNTs) as hybrid skeleton. As a result, the Mg2Ni alloy is able to deliver a high discharge capacity of 644 mAh g-1 and more importantly, a high cycling stability with retention over 78% after 50 charge/discharge cycles has been achieved, which exceeds almost all the results ever reported on Mg2Ni alloy. Simultaneously, the electrode could also exhibit excellent supercapacitor performances including high specific capacities (296 F g-1) and outstanding cycling stability (100% retention after 100 cycles). Moreover, the hybrid device can switch between battery and supercapacitor modes immediately for need during application. These features make the C skeleton/alloy electrode a highly promising candidate for battery-supercapacitor hybrid devices with high power/energy density and favorable cycling stability.
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关键词
Mg2Ni alloy,carbon nanotube,reduced graphene oxide,nickel-metal hydride battery,supercapacitor
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