Preparation and capacitive properties of a free-standing phosphomolybdic acid heteropoly blue modified reduced graphite oxide composite
Sustainable Energy and Fuels, ISSN: 2398-4902, Vol: 5, Issue: 6, Page: 1892-1903
2021
- 13Citations
- 6Captures
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Article Description
Polyoxometalates (POMs) have shown great potential for electrochemical energy storage. Herein, a phosphomolybdic acid heteropoly blue-modified reduced graphite oxide (PAHB/RGO) self-supporting composite is prepared through one-pot hydrothermal treatment. The individual PAHB molecule is adsorbed and evenly distributed on the RGO sheets through charge transfer. The specific capacitance of the PAHB/RGO composite is 395 F gat 1 A gas a binder-free electrode. Further kinetic analysis discloses that electrical double-layer capacitance dominates the total specific capacitance of the PAHB/RGO composite. An excellent capacity retention of 84% is obtained for the PAHB-9/RGO electrode after 5000 consecutive cycles at 5 A g. A solid symmetrical supercapacitor (PAHB-9/RGO//PAHB-9/RGO) with a working voltage of 1.2 V has been assembled. The PAHB-9/RGO//PAHB-9/RGO cell can supply a high specific energy of 26.2 W h kgat 600 W kg. A moderate capacity retention of 74%, moreover, is obtained after 10 000 consecutive charge-discharge at 5 A gfor the PAHB-9/RGO//PAHB-9/RGO cell. This work provides insights into constructing excellent electrode materials based on POMs for supercapacitors.
Bibliographic Details
Royal Society of Chemistry (RSC)
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