5 years ago

Scalable Fabrication and Integration of Graphene Microsupercapacitors through Full Inkjet Printing

Scalable Fabrication and Integration of Graphene Microsupercapacitors through Full Inkjet Printing
Xinliang Feng, Martin R. Lohe, Jiantong Li, Mikael Östling, Sheng Yang, Panpan Zhang, Szymon Sollami Delekta, Xiaodong Zhuang
A simple full-inkjet-printing technique is developed for the scalable fabrication of graphene-based microsupercapacitors (MSCs) on various substrates. High-performance graphene inks are formulated by integrating the electrochemically exfoliated graphene with a solvent exchange technique to reliably print graphene interdigitated electrodes with tunable geometry and thickness. Along with the printed polyelectrolyte, poly(4-styrenesulfonic acid), the fully printed graphene-based MSCs attain the highest areal capacitance of ∼0.7 mF/cm2, substantially advancing the state-of-art of all-solid-state MSCs with printed graphene electrodes. The full printing solution enables scalable fabrication of MSCs and effective connection of them in parallel and/or in series at various scales. Remarkably, more than 100 devices have been connected to form large-scale MSC arrays as power banks on both silicon wafers and Kapton. Without any extra protection or encapsulation, the MSC arrays can be reliably charged up to 12 V and retain the performance even 8 months after fabrication.

Publisher URL: http://dx.doi.org/10.1021/acsnano.7b03354

DOI: 10.1021/acsnano.7b03354

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