期刊
ACS APPLIED ENERGY MATERIALS
卷 2, 期 4, 页码 2972-+出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b00447
关键词
cycloteraphosphate; supercapacitors; electrochemical; energy density; Ragone plot
资金
- Australian Research Council (ARC) through Future Fellowship [FT180100058]
- Department of Science and Technology (DST) [IFA-13/MS-05, IFA-14/PH-92]
- Korea Institute of Energy Technology Evaluation and Planning - Ministry of Trade, Industry AMP
- Energy of the Republic of Korea [20173010012940]
- HYUHPSTAR-Carnegie Global High Pressure Research Centre through Korea's NRF [2016K1A4A3914691]
Recently, transition metal phosphates (TMPs) are demonstrated as promising candidates for supercapacitors due to their good conduct'vity 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 batterylevel 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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