An ideal electrode material for supercapacitors should possess suitable meso/macro-pores as electrolyte reservoirs and rich micro-pores as places for the adsorption of electrolyte ions. « lessĬO 2 conversion to useful materials is the most attractive approach to control its content in the atmosphere. Most importantly, these devices show outstanding cycling performance, outperforming many reported asymmetric pseudocapacitors. All-pseudocapacitive organic–inorganic asymmetric devices with MXene cathodes and rGO–polymer anodes more » can operate in voltage windows up to 1.45 V in 3 m H 2SO 4. 2D titanium carbide (Ti 3C 2T x), MXene, as a universal pseudocapacitive anode material for a range of CPs, such as polyaniline, polypyrrole, and poly(3,4-ethylenedioxythiophene) deposited on reduced graphene oxide (rGO) sheets, is reported here. However, CPs lack matching pseudocapacitive anode materials that can perform well in protic electrolytes (e.g., sulfuric acid). One way to expand their voltage window (thus energy density) in aqueous electrolytes is to manufacture asymmetric supercapacitors using distinctly different anodes. « lessĬonducting polymers (CPs) are attractive pseudocapacitive materials which show the highest capacitance under positive potentials in aqueous protic electrolytes. Utilizing the ability of Ti 3C 2T x–MXene electrodes to operate at negative potentials in aqueous electrolytes, it is shown that using Ti 3C 2T x as a negative electrode and rGO as a positive one in asymmetric architectures is a promising strategy for increasing both energy and power densities of micro–supercapacitors. Further, these micro–supercapacitors show a high level of flexibility during mechanical bending. This MXene–based asymmetric micro–supercapacitor operates at a 1 V voltage window, while retaining 97% of more » the initial capacitance after ten thousand cycles, and exhibits an energy density of 8.6 mW h cm –3 at a power density of 0.2 W cm –3. The electrode materials are comprised of titanium carbide MXene (Ti 3C 2T x) and reduced graphene oxide (rGO), which are both 2D layered materials that contribute to the fast ion diffusion in the interdigitated electrode architecture. Here, the interdigitated device architecture is fabricated using a custom–made mask and a scalable spray coating technique onto a flexible, transparent substrate. In this study, simple fabrication of an asymmetric MXene–based micro–supercapacitor that is flexible, binder–free, and current–collector–free is reported. (ORNL), Oak Ridge, TN (United States) Sponsoring Org.: USDOE Office of Science (SC), Basic Energy Sciences (BES) OSTI Identifier: 1480602 Alternate Identifier(s): OSTI ID: 1563005 Grant/Contract Number: AC05-00OR22725 Resource Type: Accepted Manuscript Journal Name: Electrochimica Acta Additional Journal Information: Journal Volume: 259 Journal Issue: C Journal ID: ISSN 0013-4686 Publisher: Elsevier Country of Publication: United States Language: English Subject: 36 MATERIALS SCIENCE Supercapacitors MXene Graphene Volumetric capacitance 2D = ,Ĭurrent microfabrication of micro–supercapacitors often involves multistep processing and delicate lithography protocols. Publication Date: Wed Nov 01 00:00: Research Org.: Oak Ridge National Lab.
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