Materials for Electrochemical Capacitors

Review : Materials for Electrochemical Capacitors ; Simon et al, Nature Materials 2008
In this review article, we recalled the latest key fundamental discoveries obtained in the field of supercapacitors, such as the dramatic capacitance increase in carbon pores with a size less than 1 nm (Science 2006, see above) and the maximum capacitance when the ion size was in the same range of the pore size (JACS 2008, see Figure). There two contributions have led to a paradigm shift in the way the charge of the electrochemical double layer, was achieved in confined pores ; this helped to overcome a barrier that has been hampering the progress in the field for several decades. Beyond that, and even more important, we proposed a view of what could be future research directions in the field, such as the need for combining a theoretical approach to experimental one, the development of ionic liquid eutectic mixture for reaching high voltage supercapacitors or the decoration of high surface, highly accessible nanostructured materials together with pseudocapacitive materials operating with fast, surface limited redox reactions. The improvement of supercapacitor performance can also rest on the design of new materials that combine double-layer capacitance and pseudo-capacitance, and by developing hybrid devices. Nano-architecturing of electrodes using for instance carbon nanotubes for flexible, wearable and printable devices with shorter response time led to further improvements in power delivery.

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