Review Article


2017, 10(12): 4175–4200


Interest of molecular functionalization for electrochemical storage

Bihag Anothumakkool1, Dominique Guyomard1, Jol Gaubicher1 (*), and Lnac Madec2,3 (*)

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1 Institut des Matriaux Jean Rouxel (IMN), Universit de Nantes, CNRS, 2 rue de la Houssinire, BP32229, 44322 Nantes Cedex 3, France
2 IPREM-ECP CNRS UMR 5254, Universit de Pau, Hlioparc Pau Pyrnes, 2 av. Pierre Angot, 64053 Pau Cedex 9, France
3 Rseau sur le Stockage Electrochimique de lEnergie (RS2E), CNRS FR3459, 33 Rue Saint Leu, 80039 Amiens Cedex, France

Keywords: electrochemical storage, molecular functionalization, covalent diazonium chemistry, non-covalent π-π interactions
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ABSTRACT Despite great interests in electrochemical energy storage systems for numerous applications, considerable challenges remain to be overcome. Among the various approaches to improving the stability, safety, performance, and cost of these systems, molecular functionalization has recently been proved an attractive method that allows the tuning of material surface reactivity while retaining the properties of the bulk material. For this purpose, the reduction of aryldiazonium salt, which is a versatile method, is considered suitable; it forms robust covalent bonds with the material surface, however, with the formation of multilayer structures and sp3 defects (for carbon substrate) that can be detrimental to the electronic conductivity. Alternatively, non-covalent molecular functionalization based on π–π interactions using aromatic ring units has been proposed. In this review, the various advances in molecular functionalization concerning the current limitations in lithium-ion batteries and electrochemical capacitors are discussed. According to the targeted applications and required properties, both covalent and non-covalent functionalization methods have proved to be very efficient and versatile. Fundamental aspects to achieve a better understanding of the functionalization reactions as well as molecular layer properties and their effects on the electrochemical performance are also discussed. Finally, perspectives are proposed for future implementation of molecular functionalization in the field of electrochemical storage.
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Interest of molecular functionalization for electrochemical storage. Nano Res. 2017, 10(12): 4175–4200

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