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A Cost-Effective an...
A Cost-Effective and High-Performance Core-Shell-Nanorod-Based ZnO/alpha-Fe2O3//ZnO/C Asymmetric Supercapacitor
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- Sarkar, Debasish (författare)
- Indian Inst Sci, Solid State & Struct Chem Unit, Bengaluru 560012, India.
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- Das, Shyamashis (författare)
- Indian Inst Sci, Solid State & Struct Chem Unit, Bengaluru 560012, India.
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- Sharada, G. (författare)
- Indian Inst Sci, Solid State & Struct Chem Unit, Bengaluru 560012, India.
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- Pal, Banabir (författare)
- Indian Inst Sci, Solid State & Struct Chem Unit, Bengaluru 560012, India.
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- Rensmo, Håkan (författare)
- Uppsala universitet,Molekyl- och kondenserade materiens fysik
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- Shukla, Ashok (författare)
- Indian Inst Sci, Solid State & Struct Chem Unit, Bengaluru 560012, India.
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- Sarma, D. D. (författare)
- Uppsala universitet,Molekyl- och kondenserade materiens fysik,Indian Inst Sci, Solid State & Struct Chem Unit, Bengaluru 560012, India.
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Indian Inst Sci, Solid State & Struct Chem Unit, Bengaluru 560012, India Molekyl- och kondenserade materiens fysik (creator_code:org_t)
- 2017-03-15
- 2017
- Engelska.
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Ingår i: Journal of the Electrochemical Society. - : ELECTROCHEMICAL SOC INC. - 0013-4651 .- 1945-7111. ; 164:6, s. A987-A994
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Abstract
Ämnesord
Stäng
- A novel core-shell design for nano-structured electrode materials is introduced for realizing cost-effective and high-performance supercapacitors. In the proposed core-shell design, thin shell-layers of highly pseudo-capacitive materials provide the platform for surface or near-surface-based faradaic and non-faradaic reactions together with shortened ion-diffusion path facilitating fast-ion intercalation and deintercalation processes. The highly-conducting core serves as highway for fast electron transfer toward current collectors, improving both energy and power performance characteristics of the core-shell structure in relation to pristine component materials. Furthermore, use of carbon (C)-based materials as a shell layer in either electrode not only enhances capacitive performance through double-layer formation but also provides enough mechanical strength to sustain volume changes in the core material during long-cycling of the supercapacitor improving its cycle life. In order to enhance electrochemical performance in terms of specific capacitance and rate capability via core-shell architecture and nano-structuring, an asymmetric supercapacitor (ASC) is assembled using ZnO/alpha-Fe2O3 and ZnO/C core-shell nanorods as respective negative and positive electrodes. The ASC exhibits a specific capacitance of similar to 115 F/g at a scan rate of 10 mV/s in a potential window as large as 1.8 V with a response time as short as 39 ms and retains more than 80% of its initial capacitance after 4000 cycles. Interestingly, the ASC can deliver an energy density of similar to 41 Wh/kg and a power density of similar to 7 kW/kg that are significantly higher than those reported hitherto for iron-oxide-based ASCs.
Ämnesord
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
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