DataVXThe Journal of Physical Chemistry CPaper
journal article·2019-04-11

Discussion on Operational Voltage and Efficiencies of Ionic-Liquid-Based Electrochemical Capacitors

Mayara C. G. Santos, Glaura G. Silva, Ricardo Santamaría, Paulo F. R. Ortega, Rodrigo L. Lavall

The Journal of Physical Chemistry C· Volume 123· Issue 14
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Source abstract

Abstract

In this article, we explore electrical double-layer capacitors (EDLCs) based on ionic liquids (IL), focusing on their stability and efficiencies (Coulombic and energetic). We analyze the conventional voltammetric methods to determine the electrochemical stability window, pointing out that a simple analysis of Coulombic efficiency, under different current and voltage conditions in galvanostatic experiments, has the advantage of being more representative for real cells, especially when studied together with energy efficiency. In addition, we study how IL-based EDLCs differ from aqueous and organic ones in terms of energy efficiency correlating with the physicochemical properties of electrolytes. Finally, we discuss the high resistance of this type of EDLC that has a detrimental effect on energy efficiency and cycling performance, even when the Coulombic efficiency is close to 100%.
Source: openalex_inverted_index · Quality: baseline

Research context

Energy storage

OpenAlex topics: Supercapacitor Materials and Fabrication · Ionic liquids properties and applications · Conducting polymers and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Departamento de Química/ICEx, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627 − Pampulha, CEP 31270-901, Belo Horizonte, MG, Brazil

Instituto Nacional del Carbón, INCAR-CSIC, Apdo. 73, 33080 Oviedo, Spain

Departamento de Química, Centro Federal de Educação Tecnológica de Minas Gerais, Av. Amazonas, 5253 − Nova Suíça, CEP 30421-5169, Belo Horizonte, MG, Brazil

Funding

Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior · Instituto Nacional de Ci?ncia e Tecnologia em Nanomateriais de Carbono · Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico

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