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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Nunes, M.
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Topics
Publications (16/16 displayed)
- 2023Wear of Bulk-fill Composite Resins After Thermo-mechanical Loadingcitations
- 2021Carbon nanotube/graphene nanocomposites built via surfactant-mediated colloid assembly as metal-free catalysts for the oxygen reduction reactioncitations
- 2019Graphene-poly(nickel complex) as novel electrochromic nanocomposite for the fabrication of a robust solid-state devicecitations
- 2019Electrocatalytic activity of new Mn3O4@oxidized graphene flakes nanocomposites toward oxygen reduction reactioncitations
- 2019Cu-based N-doped/undoped graphene nanocomposites as electrocatalysts for the oxygen reductioncitations
- 2018Co3O4 Nanoparticles Anchored on Selectively Oxidized Graphene Flakes as Bifunctional Electrocatalysts for Oxygen Reactionscitations
- 2017Graphene-poly(nickel complex) as novel electrochromic nanocomposite for the fabrication of a robust solid-state devicecitations
- 2017PMo11V@N-CNT electrochemical properties and its application as electrochemical sensor for determination of acetaminophencitations
- 2017Multicolour Electrochromic Film Based on a TiO2@poly[Ni(sa/en)] Nanocomposite with Excellent Electrochemical Stabilitycitations
- 2016Phosphomolybdate@Carbon-Based Nanocomposites as Electrocatalysts for Oxygen Reduction Reactioncitations
- 2016Carbon Nanomaterials-based modified electrodes for Electrocatalysis
- 2016Jose de Escovar at the Chapel of the Souls: Technical and material study of a 1603 panel painting
- 2016High-Performance Electrochromic Devices Based on Poly[Ni(salen)]-Type Polymer Filmscitations
- 2016Carbon Nanomaterials-based modifed electrodes for Electrocatalysis
- 2015Sucrose-derived activated carbons: electron transfer properties and application as oxygen reduction electrocatalystscitations
- 2015Biomolecules Electrochemical Sensing Properties of a PMo11V@N-Doped Few Layer Graphene Nanocompositecitations
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article
Sucrose-derived activated carbons: electron transfer properties and application as oxygen reduction electrocatalysts
Abstract
The development of carbon-based metal-free electrocatalysts for the oxygen reduction reaction (ORR) is one of the most attractive topics in fuel cell field. Herein, we report the application of two sustainable sucrose-based activated carbons (ACs), denominated SC800 and SH800, as ORR electrocatalysts. In alkaline medium the ACs showed similar onset potentials at E-onset approximate to -0.20 V vs. Ag/AgCl (0.76 V vs. E-RHE), which are 0.06 V more negative than that observed for 20 wt% Pt/C used as a reference. Higher diffusion-limiting current densities (j(L(-1.0 V, 1600 rpm)) = -3.44 mA cm(-2)) were obtained for the SH800 electrocatalyst, in contrast to SC800 (j(L(-1.0 V, 1600 rpm)) = -3.04 mA cm(-2)). These differences can be related with their different textural properties. The SH800 electrocatalyst revealed a higher specific surface area (A(BET) approximate to 2500 m(2) g(-1)), larger micropores (widths between 0.7 and 2 nm) and sponge-like morphology. Conversely, SC800 showed a spherical shape, A(BET) approximate to 1400 m(2) g(-1) and narrow micropores with pore width <0.7 nm. Both ACs were neither selective to 2- or 4-electron ORR processes, opposing Pt/C which showed selectivity towards direct O-2 reduction to water. SH800 and SC800 showed very similar Tafel plots, but with SH800 showing in both low and high current density regions, the lowest slopes values 53/171 mV dec(-1) vs. 68/217 mV dec(-1). Furthermore, the ACs presented excellent tolerance to methanol, with the SH800 electrocatalyst also showing greater long-term electrochemical stability than the Pt/C electrocatalyst which are very important advantages. The ACs-based electrocatalysts also showed ORR catalytic activity in acidic media, which makes them promising candidates for applications with acidic electrolytes (e.g. proton exchange fuel cells). In this case, E-onset = 0.06 V vs. Ag/AgCl (0.41 V vs. E-RHE) for SC800 and E-onset = -0.01 V vs. Ag/AgCl (0.34 V vs. E-RHE) for SH800, and the diffusion-limiting current densities are very similar for both ACs (jL = -2.59/-2.76 mA cm(-2) at -1.3 V vs. Ag/AgCl, at 1600 rpm). SH800 and SC800 Tafel plots also showed two different slopes, but with higher values in both low and high current density regions, when compared with those obtained in an alkaline medium; still SH800 continues to show the lowest slopes.