Gelines Moreno-Fernandez

Protio Power

Lithium-sulfur batteries (LSBs) have emerged as promising alternatives to replace Li-ion technology in lightweight applications, but they still face some important challenges that hinder their commercialization. To overcome them, several optimization strategies focusing on each battery component have been investigated. In this work, we have explore...

In this work we present the development and optimization of a graphene-embedded Sn-based material and an activated carbon/lithium iron phosphate composite for a high-performing hybrid lithium-ion capacitor (LIC). For the negative electrode, we have synthesized and screened different tin and phosphorus-based graphene materials based on the chemical...

In this work, we investigate the potential of a novel carbon composite as an electrode for high-voltage electrochemical double-layer capacitors. The carbon composite was prepared following a sustainable synthetic approach that first involved the pyrolysis and then the activation of a precursor formed by winery wastes and graphene oxide. The composi...

The increasing demand for electrical energy storage requires the exploration of alternative battery chemistries that overcome the limitations of the current state‐of‐the‐art lithium‐ion batteries. In this scenario, lithium‐sulfur batteries stand out for their high theoretical energy density. However, several inherent limitations still hinder their...

Herein, we report a simplistic single-step synthesis of nitrogen-doped graphene decorated with tin particles suitable as a negative (battery-type) electrode for lithium-ion hybrid capacitors. An activated carbon derived from a graphene-carbon composite is used as a positive (capacitor-type) electrode. The excellent features of the nitrogen-doped gr...

Electrical double-layer capacitors bring numerous strengths to the energy storage landscape but have limited use due to their high unit energy cost and low specific energy. Water-in-salt electrolytes have been recently purported as an option to provide more affordable energy storage, but high viscosity and limited conductivity hinder their direct u...

In this work we report an easy and ecofriendly approach for the preparation of activated carbon‐graphene composites using cigarette filter wastes as precursor and evaluate its potential application as electrodes for high energy electrochemical capacitors. Graphene‐biowaste derived carbon composites are tested as active electrode materials in three...

Spray gun machine was used to deposit high surface area supercapacitor electrodes using green non‐toxic aqueous dispersions based on three kinds of high specific surface area nanostructured carbon materials: activated graphene (a‐rGO) and activated carbon (AC). Tuning spray conditions and dispersion formulation allowed to achieve good adhesion to s...

The Cover Feature illustrates the ultrafast charge of a dual graphene lithium‐ion capacitor. The power density of this device is boosted due to the flat‐shaped morphology of the active materials and the phosphate functionalization of the negative electrode. More information can be found in the Article by G. Moreno‐Fernández, D. Carriazo and co‐work...

Ball-milling under either air or argon is explored as a facile way to adjust the textural properties, surface chemistry and morphology of activated reduced graphene oxide to the requirements for optimum electrode materials in electrical double layer capacitors operating in aqueous (KOH), organic (tetraethylammonium tetrafluoroborate in acetonitrile...

The mechanisms behind enhanced charge storage of P-functionalized carbons are unraveled for the first time using non-porous graphene oxide treated with phosphoric acid and annealed at either 400 or 800 °C. The electrochemical study in 1M H2SO4 reveals that phosphorus groups boost charge storage and electrochemical stability, with more effect for th...

Herein we report an easy, ecofriendly and cheap synthetic approach for the preparation of carbon composites from the pyrolysis and activation of coffee waste and graphene oxide, and their evaluation as potential electrodes for lithium ion capacitors (LICs). An exhaustive optimization of some important parameters such as particle size, electronic co...

Correction for ‘Flat-shaped carbon–graphene microcomposites as electrodes for high energy supercapacitors’ by Gelines Moreno-Fernández et al. , J. Mater. Chem. A , 2019, 7 , 14646–14655.

Herein, we report a simple approach for the preparation of phosphate-functionalized carbonaceous graphene-based composites. The homogeneous deposition of a thin layer of phenolic resin on the surface of graphene oxide (GO) sheets was achieved using phosphoric acid as the polymerization catalyst and functionalization agent. Subsequent pyrolysis of t...

This study is essentially based on innovative electrolytes such as the organic salt N-methyl-N-butylpyrrolidinium tetrafluoroborate (Pyr14BF4) dissolved in propylene carbonate (PC) and the pure ionic liquid (N-butyl-N-methyl-pyrrolidinium bis(trifluoromethanesulfonyl)imide (Pyr14TFSI) and its solution in PC. Activated carbon cloths were used as sel...

Activated carbon fibers (ACF) are interesting candidates for electrodes in electrochemical energy storage devices; however, one major drawback for practical application is their low density. In the present work, monoliths were synthesized from two different ACFs, reaching 3 times higher densities than the original ACFs’ apparent densities. The poro...

Carbon monoliths are prepared by combining two carbon phases. A major phase is activated anthracite, which provides microporosity and a large surface area. The other phase is a carbonized polymer that provides self-consistency and contributes to densifying the monolith. Different degrees of anthracite activation and different contents of the two ph...

The results obtained for binder-free electrodes made of carbon monoliths with narrow micropore size distributions confirm that the specific capacitance in the electrolyte (C2H5)4NBF4/acetonitrile does not depend significantly on the micropore size and support the foregoing constant result of 0.094±0.011 F/m2

Specific capacitance of carbons in aqueous KOH electrolyte seems to have two contributions, a double-layer capacitance and a pseudocapacitance. Moreover, the specific capacitance increases as the specific surface area does. Here, we report that the pseudocapacitance is associated with the K+ ion and the double-layer capacitance with both K+ and OH–...