Supersaturated 'water-in-salt' hybrid electrolyte towards building high voltage Na-ion capacitors with wide temperatures operation
| Autor: | Vanchiappan Aravindan, Rodney Chua, Palanichamy Sennu, Srinivasan Madhavi, Sai S. H. Dintakurti, John V. Hanna, Raghunath O. Ramabhadran |
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| Přispěvatelé: | School of Materials Science and Engineering, Interdisciplinary Graduate School (IGS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Mixed Anions Energy Engineering and Power Technology 02 engineering and technology Electrolyte 010402 general chemistry 01 natural sciences law.invention Ion High and Sub-Zero Temperatures law medicine Electrical and Electronic Engineering Physical and Theoretical Chemistry Supercapacitor Supersaturation Aqueous solution Materials [Engineering] Renewable Energy Sustainability and the Environment 021001 nanoscience & nanotechnology 0104 chemical sciences Capacitor Chemical engineering Density functional theory 0210 nano-technology Activated carbon medicine.drug |
| Popis: | Aqueous asymmetric supercapacitors (ASC) is considered to fulfill the safety and high energy-power requirements simultaneously towards building next-generation storage devices. One of the most attractive electrolytes is multiple ion-based water-in-salt (WIS) solutions, which are steadily conquering the field of rechargeable batteries/capacitors. Stabilizing the pH value is one of the efficient ways to improve the energy density of the charge storage system by widening the operating potential. In this line, we report that acetate ions could help to neutralize the pH of sodium(I)bis(fluorosulfonyl)imide-based WIS electrolyte by diluting the free water molecules without any precipitation or recrystallization, and allow to widen the operating potential window from ~2.7 to 3.1 V. The Physico-chemical properties of mixed anions-based electrolytes are explored from confocal-Raman and Nuclear magnetic resonance studies. In addition, we performed ab-initio density functional theory calculations to study the co-ordination environment. Apparently, the acetate (OAcˉ) ions show a stronger interaction with Na+ ion compared to weakly coordinating imide (FSIˉ) analogues. The Na0.44MnO2 and prosopis juliflora derived activated carbon (PJAC) based ASC, and PJAC based symmetric supercapacitor (SSC) using mixed WIS electrolyte is cycled up to 5000 times. Further, the influence of environmental conditions (60 and −20 °C) is also studied in detail for the WIS based electrolyte for both ASC and SSC. National Research Foundation (NRF) This research is supported by grants from the National Research Foundation, Prime Minister's Office, Singapore under its Campus of Research Excellence and Technological Enterprise (CREATE) programme under the Singapore-HUJ Alliance for Research and Enterprise Ltd (SHARE), NEW-CREATE which is joint research programme between the Hebrew University of Jerusalem (HUJ, Israel) and Nanyang Technological University (NTU, Singapore). ROR acknowledges the Department of Science & Technology (DST), Science & Engineering Research Board (SERB) for the Early Career Research Award (ECR/2016/000041). VA acknowledges financial support from the SERB, a statutory body of the DST, Govt. of India, through the Ramanujan Fellowship (SB/S2/RJN-088/2016). |
| Databáze: | OpenAIRE |
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