2 research outputs found
Scalable Fabrication and Integration of Graphene Microsupercapacitors through Full Inkjet Printing
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,
polyÂ(4-styrenesulfonic acid), the fully printed graphene-based MSCs
attain the highest areal capacitance of ∼0.7 mF/cm<sup>2</sup>, 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
Few-Layer Graphene Shells and Nonmagnetic Encapsulates: A Versatile and Nontoxic Carbon Nanomaterial
In this work a simple and scalable approach to coat nonmagnetic nanoparticles with few-layer graphene is presented. In addition, the easy processing of such nanoparticles to remove their core, leaving only the 3D graphene nanoshell, is demonstrated. The samples are comprehensively characterized, as are their versatility in terms of functionalization and as a material for electrochemical storage. Indeed, these 3D graphene nanostructures are easily functionalized much as is found with carbon nanotubes and planar graphene. Electrochemical investigations indicate these nanostructures are promising for stable long-life battery applications. Finally, initial toxicological investigations suggest no acute health risk from these 3D graphene nanostructures