Journal
DALTON TRANSACTIONS
Volume 51, Issue 3, Pages 1032-1040Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1dt03346h
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Funding
- National Natural Science Foundation of China [51702369, 51873233]
- Key R&D Plan of Hubei Province [2020BAB077]
- Fundamental Research Funds for the Central Universities [CZZ21009, CZP20006]
- innovation group of the National Ethnic Affairs Commission of China [MZR20006]
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The study demonstrates a method to fabricate hollow/porous nanostructures using nanoscale Kirkendall effect and showcases the application of CuO/Co3O4 and Fe2O3 nanoframes in supercapacitor electrodes, showing good performance and reliability.
Hollow/porous nanomaterials are widely applicable in various fields. The last few years have witnessed increasing interest in the nanoscale Kirkendall effect as a versatile route to fabricate hollow/porous nanostructures. The transformation of Cu-Co Prussian blue analogue (CuCo-PBA) and FeFe-PBA nanocubes into CuO/Co3O4 and Fe2O3 nanoframes is based on two types of nanoscale Kirkendall effect, which are related to solid-solid interfacial oxidation and solid-gas interfacial reaction, respectively. Both CuO/Co3O4 and Fe2O3 nanoframe electrodes exhibit high reversible discharge capacity, good rate performance and long cycling stability. Moreover, an asymmetric supercapacitor (ASC) is assembled by using CuO/Co3O4 as a cathode and Fe2O3 as an anode, respectively. The ASC can be operated in a wide potential range of 1.4 V with a large specific capacity of 181.8 F g(-1), a high energy density of 48.77 W h kg(-1) (at 751.2 W kg(-1)), an outstanding power density of 3657.8 W kg(-1) (at 32.9 W h kg(-1)) and a good capacity retention (73.68%) after 6000 galvanostatic charge-discharge cycles, together with excellent flexibility. The ASC in series can power a LED and work stably under water conditions, delivering excellent practicability.
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