DataVXACS Applied Energy MaterialsPaper
journal article·2019-04-22

Cobalt Cyclotetraphosphate (Co2P4O12): A New High-Performance Electrode Material for Supercapacitors

Deepak R. Patil, B. Koteswararao, Krishna Begari, Arvind Yogi, Mahmoud Moussa, Deepak P. Dubal

ACS Applied Energy Materials· Volume 2· Issue 4
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Source abstract

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.
Source: openalex_inverted_index · Quality: baseline

Research context

Energy storage

OpenAlex topics: Supercapacitor Materials and Fabrication · Advanced battery technologies research · Advancements in Battery Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Centre for Materials for Electronics Technology, Ministry of Electronics and Information Technology (MeitY), Government of India, Pune 411008, India

Department of Physics and Astronomy, Center for Novel State of Complex Materials Research, Seoul National University, Seoul 151-747, Korea

Department of Physics, Indian Institute of Technology Tirupati, Tirupati 517506, India

School of Physics, University of Hyderabad, Hyderabad 500046, India

Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, India

Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 08826, Korea

School of Chemical Engineering, The University of Adelaide, Adelaide, South Australia 5005, Australia

School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology (QUT), 2 George Street, Brisbane, QLD 4001, Australia

Funding

Queensland University of Technology · Korea Institute of Energy Technology Evaluation and Planning · Department of Science and Technology, Ministry of Science and Technology · National Research Foundation of Korea · Australian Research Council

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