Layer‐by‐Layer Assembled Heteroatom‐Doped Graphene Films with Ultrahigh Volumetric Capacitance and Rate Capability for Micro‐Supercapacitors

Abstract

Highly uniform, ultrathin, layer-by-layer heteroatom (N, B) co-doped graphene films are fabricated for high-performance on-chip planar micro-supercapacitors with an ultrahigh volumetric capacitance of ∼488 F cm(-3) and excellent rate capability due to the synergistic effect of nitrogen and boron co-doping.

Materials Design and System Construction for Conventional and New‐Concept Supercapacitors

“…Nitrogen and boron co‐doped graphene films have been assembled into planar devices through lithographically dry‐etching the films on silicon wafers 459. MSCs based on these interdigitated electrodes deliver the enhanced capacitances by the geometrical area and volume.…”

Graphene based metal and metal oxide nanocomposites: synthesis, properties and their applications

“…An example could be graphene-based composite films fabricated via layerby-layer self-assembly of the individual components. 206,207 In the following sections are organized in such a way that the most common applications of graphene/metallic NPs based nanocomposites, such as energy storage, sensing, catalysis are discussed. For each individual application the discussion, which is focused mostly on type I composites, follows the sequence from group 4 to group 12 of the periodic table (cf.…”

On‐Chip Micro‐Pseudocapacitors for Ultrahigh Energy and Power Delivery

“…In contrast to thin film batteries whose properties drop dramatically with the decrease of sizes, micro‐supercapacitors often have better performance in comparison with their bulk counterparts as the result of reduced transport length of charge and electrolytes 1, 2. Interdigital planar form micro‐supercapaciotors (MSCs) with active carbon,3 carbide‐derived carbon,4 carbon nanoparticles/nanotubes2, 5, 6, 7 and multilayer graphene7, 8, 9, 10, 11, 12, 13 as electrode materials have been developed and are capable of delivering high power density by electrochemical double layer charge storage. However, their energy densities, typically, 0.1–1.0 mW h cm −3 , are insufficient to meet the requirement of the reasonable operational time of microdevices.…”