Low-temperature supercapacitor
Supercapacitors have emerged as one of the most effective energy storage technologies. Recently, pseudocapacitors have started making waves in the research field. Its fast and reversible faradaic reaction enhances specific capacitance and hence, energy density, which is beneficial for energy st...
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Format: | Final Year Project |
Language: | English |
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Nanyang Technological University
2023
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Online Access: | https://hdl.handle.net/10356/167823 |
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Institution: | Nanyang Technological University |
Language: | English |
Summary: | Supercapacitors have emerged as one of the most effective energy storage
technologies. Recently, pseudocapacitors have started making waves in the research
field. Its fast and reversible faradaic reaction enhances specific capacitance and hence,
energy density, which is beneficial for energy storage. However, pseudocapacitors
have relatively low power density and cyclic stability.
In this report, the components of a Manganese Oxide (MnO2) pseudocapacitor such as
its electrode material and electrolyte mixture were varied to improve specific
capacitance as well as low temperature stability respectively. For the MnO2 electrode,
the amount and type of carbon-based additives (graphene and acetylene carbon black)
were explored and were found to have very favourable results. Graphene proved to be
the better carbon-based additive and the sample with the largest amount improved
specific capacitance by fourfold.
For the electrolyte mixture, potassium hydroxide (KOH) solution was compared to a
mixture of aqueous sodium chloride (NaCl) and ethylene glycol (EG) to determine
their ability to maintain specific capacitance at low temperatures of 0°C to -40°C. The
aqueous NaCl-EG mixture was found to be a better electrolyte in achieving this
objective, allowing operating temperatures to go as low as -60°C. |
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