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Schematic diagram of preparing CNT/PANI/HTC composite electrode via a three-step process which comprises: CVD growth of CNTs, electrochemical polymerisation of 
Aniline, and hydrothermal carbonisation of glucose. Source: University of Surrey

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University of Surrey Unveiled High Power Density Supercapacitor Technology

14.5.2020
Reading Time: 2 mins read
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Schematic diagram of preparing CNT/PANI/HTC composite electrode via a three-step process which comprises: CVD growth of CNTs, electrochemical polymerisation of 
Aniline, and hydrothermal carbonisation of glucose. Source: University of Surrey

Schematic diagram of preparing CNT/PANI/HTC composite electrode via a three-step process which comprises: CVD growth of CNTs, electrochemical polymerisation of Aniline, and hydrothermal carbonisation of glucose. Source: University of Surrey

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In a paper published by the journal Energy and Environmental Materials, researchers from Surrey’s Advanced Technology Institute (ATI) revealed their new technology which has the potential to revolutionise energy use in electric vehicles and reduce renewable based energy loss in the national grid. The team also believe their technology can help push forward the advancement of wind, wave and solar energy by smoothing out the intermittent nature of the energy sources.

The ATI’s super-capacitor technology is based on a material called Polyaniline (PANI), which stores energy through a mechanism known as “pseudocapacitance.” This cheap polymer material is conductive and can be used as the electrode in a super-capacitor device. The electrode stores charge by trapping ions within the electrode. It does this by exchanging electrons with the ion, which “dopes” the material.

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In their paper, the team detail how they developed a new three-layer composite using carbon nanotubes, PANI, and hydrothermal carbon that demonstrates remarkable rate-capability at high energy densities, independent of the power use.

The CNT/PANI/HTC composite exhibited a high specific capacitance of 571 Fg-1 at 1 Ag-1, and 557 Fg-1 and 100 Ag-1. Demonstrating, to the best of our knowledge, a record rate capability of 98% capacitance retention, when the current density is increased 100-fold. This advanced rate performance indicates that a slow electrodeposition process produces an electrochemically stable three-layer composite with enhanced diffusion kinetics.

Ash Stott, lead scientist on the project and Ph.D student from the University of Surrey, said: “The future of global energy will depend on consumers and industry using and generating energy more efficiently and super-capacitors have already been proven to be one of the leading technologies for intermittent storage as well as high-power delivery. Our work, has established a baseline for high energy devices that also operate at high power, effectively widening the range of potential applications.”

Professor Ravi Silva, Director of the ATI at the University of Surrey, said: “This highly ambitious and impactful work has the potential to change the way we all live our lives – and it might be what is needed to make the change for an efficient and fast charging solution of harvested energy from the environment. We see this having an impact in all sorts of industries – from all wearable technology to mobile Internet of Things applications that will launch the 5G revolution. The potential for our super-capacitor is limitless.”

Source: University of Surrey

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