Cobalt cyclotetraphosphate (Co₂P₄O₁₂ ): a new high-performance electrode material for supercapacitors
Date
2019
Authors
Patil, D.R.
Koteswararao, B.
Begari, K.
Yogi, A.
Moussa, M.
Dubal, D.P.
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Journal article
Citation
ACS Applied Energy Materials, 2019; 2(4):2972-2981
Statement of Responsibility
Deepak R. Patil, B. Koteswararao, Krishna Begari, Arvind Yogi, Mahmoud Moussa, Deepak P. Dubal
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Abstract
Recently, 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.
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© 2019 American Chemical Society