Anthraquinone modification of microporous carbide derived carbon films for on-chip micro-supercapacitors applications

The modification of carbide derived carbon (CDC) thin film electrodes with anthraquinone (AQ) molecules was demonstrated by using pulsed chronoamperometry, in 0.1 M NEt4BF4/ACN solution of AQ diazonium derivative. The functionalization of CDC electrodes was only possible when a critical pore size is reached: only 2 nm pore diameter CDC can be grafted with AQ moieties, smaller pore size leading to a poorly functionalized electrode. High AQ surface coverage of 0.88 × 10−10 mol.cm−2 was determined using 2 nm pore size CDC. Despite a decrease in double layer capacitance value of about 10%, the total capacitance of the AQ-modified on-chip CDC electrodes was twice larger than that of pristine CDC film, leading to high total capacitance value of 44 mF.cm−2 (338 F.cm−3). The cyclability of the AQ-modified on-chip CDC electrode was also investigated. The faradic contribution of AQ grafted molecules progressively decreased during cycling and only 39% of the normalized capacity remained after 500 cycles; this decrease has been assigned to electrostatic repulsion of dianionic AQ confined in narrow micropores in the alkaline media

When Solid State Chemistry meets Micro-electronics: New 3D micro-batteries

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New 3D design for mobile microbatteries

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When Solid State Chemistry meets Micro-electronics: New 3D micro-batteries

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Nouveaux types d’électrodes pour les microsupercondensateurs

National audienceThe realization of high-energy micro-supercapacitors is currently a big challenge but the ineluctable applications requiring such miniaturized energy storage devices are continuously emerging. Their high power and extended lifetime are interesting for the complement or replacement of micro-batteries in embedded micro-systems. New types of electrodes for micro-supercapacitors are reviewed in this article with a focus on device fabrication methods and their performances. A 3D paradigm shift of micro-supercapacitor design is also discussed to improve their energetic performances while maintaining reduced footprint occupancy.Les microsupercondensateurs sont des microdispositifs de stockage réversible de l’énergie électrique constituant une alternative intéressante aux microbatteries en raison de leur puissance élevée et de leur durée de vie importante. La faible quantité d’énergie qu’ils peuvent emmagasiner reste cependant un point critique au déploiement de ces composants dans les microsystèmes embarqués. Cet article traite des nouveaux types d’électrodes de microsupercondensateurs, des filières technologiques pour les intégrer au sein du microdispositif et des performances de ces électrodes. Il est notamment question de l’utilisation d’électrodes tridimensionnelles pour accroître leur densité d’énergie surfacique

When Solid State Chemistry meets Micro-electronics: New 3D micro-batteries

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Challenges and prospects of 3D micro-supercapacitors for powering the internet of things

International audienceThe fabrication of miniaturized electrochemical energy storage systems is essential for the development of future electronic devices for Internet of Things applications where connected devices are increasingly deployed in our daily life. On chip micro-supercapacitors are an attractive solution to fulfill the energy requirements of autonomous, smart, maintenance free and miniaturized sensors but they suffer from a limited energy density and poor technological readiness level in spite of high power capabilities and long cycle life. This paper aims at reviewing the current micro-supercapacitor technologies and at defining the guidelines to produce high performance micro-devices with special focus on 3D designs as well as the fabrication of solid state miniaturized devices to solve the packaging issue

Last advances in sputtered nitride films as high performance pseudocapacitive electrodes for solid-state micro-supercapacitors

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Last advances in sputtered nitride films as high performance pseudocapacitive electrodes for solid-state micro-supercapacitors

International audienc

Last advances in sputtered nitride films as high performance pseudocapacitive electrodes for solid-state micro-supercapacitors

International audienc