Printed graphene microsupercapacitors (MSCs) are attractive for scalable and low-cost on-chip energy storage for distributed electronic devices. Although electronic devices have experienced significant scaling to smaller formats, the corresponding miniaturization of energy storage components has been limited, with a typical resolution of â30 μm for printed graphene patterns to date. Transfer printing is demonstrated here for patterning graphene electrodes with fine line and spacing resolution less than 5 μm. The resulting devices exhibit an exceptionally small footprint (â0.0067 mm2), which provides, to the best of our knowledge, the smallest printed graphene MSCs. Despite this, the devices retain excellent performance with a high areal capacitance of â6.63 mF/cm2 along with excellent electrochemical stability and mechanical flexibility, resulting from an efficient nonplanar electrode structure and an optimized two-step photoannealing method. As a result, this miniaturization strategy facilitates the on-chip integration of printed graphene MSCs to power emerging electronic devices.
Bibliographical noteFunding Information:
The authors thank Dr. S. Brett Walker and Professor Jennifer Lewis for silver ink supply. This work was supported by the Multi-University Research Initiative (MURI) program (N00014-11-1-0690) sponsored by the Office of Naval Research. Support from the Air Force Research Laboratory under agreement number FA8650-15-2-5518 is also acknowledged. Parts of this work were performed at the Characterization Facility and the Nano-Fabrication Center of the University of Minnesota. The U.S. Government is authorized to reproduce and distribute reprints for governmental purposes notwithstanding any copyright notation thereon. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of the sponsors.
© 2018 American Chemical Society.
- electrochemical energy storage
- graphene ink
- high-resolution electrode
- printed electronics