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Cobalt cyclotetraphosphate (Co₂P₄O₁₂ ): a new high-performance electrode material for supercapacitors

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dc.contributor.authorPatil, D.R.
dc.contributor.authorKoteswararao, B.
dc.contributor.authorBegari, K.
dc.contributor.authorYogi, A.
dc.contributor.authorMoussa, M.
dc.contributor.authorDubal, D.P.
dc.date.issued2019
dc.description.abstractRecently, transition metal phosphates (TMPs) are demonstrated as promising candidates for supercapacitors due to their good conductivity and long-term stability. Herein, we have inrtoduced cobalt cyclotetraphosphate (Co₂P₄O₁₂) as novel supercapacitive electrode material, which deliver a capacitance of 437 F/g with good stability over 3000 cycles (around 90%). To display the practical relevance, we have fabricated asymmetric device using activated carbon and Co₂P₄O₁₂ as negative and positive electrodes, respecitvely, which can be operated up to 1.4 V. The introduction of redox-active moieties (such as potassium iodide (KI)) in parent KOH solution enhances the capacitance from 120 F/g to 156 F/g for Co₂P₄O₁₂//AC cell with extended voltage window (1.8 V). Owing to the additional voltage and advancement in the capacitance, the cell delivers battery-level energy of 70 Wh/kg at power density of 2.3 kW/kg. It should be emphasized that even at high power (7.6 kW/kg), the cell maintained very good specific energy of 48 Wh/kg, suggesting excellent rate performance. The asymmetric device further showed long cycling stability with negligible loss and excellent Coulombic efficiency over 5000 cycles. Thus, metal cyclotetraphosphate can be employed as a promising electrode material in energy storage systems.
dc.description.statementofresponsibilityDeepak R. Patil, B. Koteswararao, Krishna Begari, Arvind Yogi, Mahmoud Moussa, Deepak P. Dubal
dc.identifier.citationACS Applied Energy Materials, 2019; 2(4):2972-2981
dc.identifier.doi10.1021/acsaem.9b00447
dc.identifier.issn2574-0962
dc.identifier.issn2574-0962
dc.identifier.orcidMoussa, M. [0000-0001-5890-0851]
dc.identifier.orcidDubal, D.P. [0000-0002-2337-676X]
dc.identifier.urihttp://hdl.handle.net/2440/123995
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.relation.granthttp://purl.org/au-research/grants/arc/FT180100058
dc.rights© 2019 American Chemical Society
dc.source.urihttp://dx.doi.org/10.1021/acsaem.9b00447
dc.subjectCycloteraphosphate; supercapacitors; electrochemical; energy density; Ragone plot
dc.titleCobalt cyclotetraphosphate (Co₂P₄O₁₂ ): a new high-performance electrode material for supercapacitors
dc.typeJournal article
pubs.publication-statusPublished

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