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Juan Luis Gómez Urbano

Juan Luis Gómez Urbano

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20
Publications
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222
Citations

Publications

Publications (20)
Article
Full-text available
In this work we report the synthesis of a non‐graphitizable carbon through a cost‐effective pyrolysis of a brewery waste product. We demonstrate that it is possible to realize hard carbon with structural and morphological properties from an abundant biomass source with a suitable application in energy storage devices. Resulting hard carbon displays...
Article
Full-text available
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...
Article
Full-text available
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...
Article
Full-text available
Microstructured nitrogen-doped graphene-Sn synthetized in one step for high performance and long-term cycling stability lithium-ion capacitors.
Article
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...
Article
Full-text available
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...
Article
Full-text available
Graphene aerogels derived from a biomolecule‐assisted aqueous electrochemical exfoliation route are explored as cathode materials in sodium–oxygen (Na–O2) batteries. To this end, the natural nucleotide adenosine monophosphate (AMP) is used in the multiple roles of exfoliating electrolyte, aqueous dispersant, and functionalizing agent to access high...
Preprint
Herein, we report an easy approach for the preparation of graphene‐based materials suitable as electrodes for lithium‐ion capacitors (LICs). To the best of our knowledge, this is the first time that phosphorus‐functionalized graphene oxide (rGO800‐P) is used as negative (battery‐type) electrode in LICs technology. An activated carbon derived from t...
Article
Full-text available
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...
Article
Full-text available
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...
Article
Full-text available
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.
Article
Full-text available
The depletion of fossil fuels, the rapid evolution of the global economy and high life standards require the development of new energy storage systems that can meet the needs of world´s population. Metal-oxygen batteries (M = Li, Na) arise, therefore, as promising alternatives to wide-extended lithium-ion batteries, due to their high theoretical en...
Article
Full-text available
The carbon coating strategy is intensively used in the modification of conversion-type anode materials to improve their cycling stability and rate capability. Thus, it is necessary to elucidate the modification mechanism induced by carbon coating. For this purpose, bare ZnMn 2 O 4 , carbon-derivative-coated ZnMn 2 O 4 , and carbon-coated ZnO−MnO co...
Article
Full-text available
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...
Article
Full-text available
Highly packed films of reduced graphene oxide and sugar-based carbon nanospheres (CNSs) were prepared by a simple hydrothermal treatment. Under hydrothermal conditions, graphene oxide was partially reduced and self-assembled forming a monolith that effectively embedded the CNSs. The spheres were homogeneously distributed within the films, that had...
Article
Full-text available
Herein we report a simple approach for the preparation of graphene oxide-carbon nanotube-sulfur composites. The self-standing composites can be easily prepared by freeze drying a frozen graphene oxide-carbon nanotube suspension, and then impregnated with sulfur by melt diffusion. Composites obtained in this way are physicochemically characterized b...
Article
Full-text available
Fundamental understanding of the physical phenomena and electrochemical reactions occurring in metal-air batteries is critical for developing rational approaches towards high-performing Na–O2 battery cathodes. In this context, air cathode porosity plays a key role on battery performance, influencing oxygen supply and hence oxygen reduction and evol...
Article
Full-text available
Lithium-sulfur batteries (Li-S) are identified as one of the most promising rechargeable energy systems due to their high theoretical capacity, high gravimetric energy density, low cost and low environmental impact. However, the insulating nature of sulfur and the migration of soluble polysulfides during discharge limit their practical application....
Poster
Most of the Li-S research has been devoted towards new materials with high areal capacity and cycling stability, especially different types of carbon with various porosity and morphology, providing significant progress in cell performance [1]. Graphene and reduced graphene oxide (rGO) composites with S have demonstrated improved electrochemical per...

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