Science· 2015Q1
Nitrogen-doped mesoporous carbon of extraordinary capacitance for electrochemical energy storage
- 2,069citations
- Q1SCImago
- 2015year
Short summary
A nitrogen-doped ordered mesoporous carbon exhibits an extraordinary capacitance of 855 F/g in aqueous electrolytes, significantly boosting energy density for supercapacitor-like devices.
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Key points
- Developed nitrogen-doped ordered mesoporous carbon with 855 F/g capacitance.
- High capacitance stems from redox reactions at nitrogen-associated defects.
- Electrochemical activity is enhanced without affecting electrical conductivity.
- Bipolar aqueous cells offer high power density and long lifetimes.
- Achieved specific energy of 41 Wh/kg (19.5 Wh/L).
AI-generated from the title and abstract; the full text is not read.
Abstract
Carbon-based supercapacitors can provide high electrical power, but they do not have sufficient energy density to directly compete with batteries. We found that a nitrogen-doped ordered mesoporous few-layer carbon has a capacitance of 855 farads per gram in aqueous electrolytes and can be bipolarly charged or discharged at a fast, carbon-like speed. The improvement mostly stems from robust redox reactions at nitrogen-associated defects that transform inert graphene-like layered carbon into an electrochemically active substance without affecting its electric conductivity. These bipolar aqueous-electrolyte electrochemical cells offer power densities and lifetimes similar to those of carbon-based supercapacitors and can store a specific energy of 41 watt-hours per kilogram (19.5 watt-hours per liter).
The authors' abstract, as published at the source. Science, 2015 · DOI ↗
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Field: Electronic, Optical and Magnetic Materials
Electronic, Optical and Magnetic MaterialsMaterials Science