Nanostructured MnxOy for oxygen reduction reaction (ORR) catalysts

Delmondo, Luisa; Salvador, Gian Paolo; Muñoz-Tabares, J.A.; Sacco, Adriano; Garino, Nadia; Castellino, Micaela; Gerosa, Matteo; Massaglia, Giulia; Chiodoni, Angelica; Quaglio, Marzia

doi:10.1016/j.apsusc.2016.03.224

Cited by 45 publications

(17 citation statements)

References 28 publications

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“…In our work, we propose a simple sol–gel synthesis an alternative in which natural green precursors (agar and amino acids as carbon and nitrogen sources, respectively) are mixed in a water solution under mild conditions (less than 90 °C, at ambient pressure) to form a gel. Agar is selected as the carbon source because it is a natural polysaccharide, extracted from a group of red algae, that becomes a gel at room temperature without the need to add any inorganic chemicals as catalysts . Choosing two different types of amino acids, that is, glycine (with one N atom in its structure) and lysine (with two N atoms in its molecule), it was possible to evaluate the influence of the N source on the final material catalytic performance and characteristics (Figure S2 in the Supporting Information).…”

Section: Introductionsupporting

confidence: 90%

“…Agar is selected as the carbon source because it is an atural polysaccharide,e xtracted from ag roup of red algae,t hat becomes ag el at room temperature without the need to add any inorganic chemicals as catalysts. [29] Choosing two different types of amino acids, that is,g lycine (with one Na tom in its structure) andl ysine (with two Na toms in its molecule), it was possible to evaluate the influence of the Ns ource on the final material catalytic performancea nd characteristics ( Figure S2 in the Supporting Information). Differenta gar and amino acid relative concentrations are investigated to establish the influence of the precursor content on the oxygenr eduction performance.…”

Section: Introductionmentioning

confidence: 99%

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Green‐Synthesized Nitrogen‐Doped Carbon‐Based Aerogels as Environmentally Friendly Catalysts for Oxygen Reduction in Microbial Fuel Cells

et al. 2018

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A green approach to the synthesis of nitrogen‐doped, carbon‐based aerogels with good conductivity and catalytic properties is presented. With the aim to design an easily sustainable process, the starting precursors are selected from abundant waste‐related organic materials. The naturally derived polysaccharide agar acts as the carbon source in a water solution and an amino acid, glycine or lysine, is used as the nitrogen source. Using this synthesis approach, nitrogen defects are created in a 3D porous aerogel. They are shown to act as active catalytic sites for the reaction of oxygen reduction to water as demonstrated by electrochemical measurements. The best performing materials are tested as cathodes in microbial fuel cells for 50 days, in conditions close to those the device would face in a real environment. The glycine‐derived carbon aerogels with the higher content of pyridinic nitrogen exhibit the best performance, as confirmed by several morphological characterizations.

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Section: Introductionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Green‐Synthesized Nitrogen‐Doped Carbon‐Based Aerogels as Environmentally Friendly Catalysts for Oxygen Reduction in Microbial Fuel Cells

et al. 2018

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“…charge transfer at the electrode-electrolyte interface. Then, the lower frequency arc is related to the slower process, which could account for the Warburg diffusion [44]. The high frequency process, which is related to the extent of the electroreduction can be modeled through a parallel between the charge transfer resistance R1 and the double layer capacitance C1, while the low frequency one, which accounts for the mass transport limitations, can be modeled through a Warburg impedance, characterized by the resistance R2; the series resistance Rs models the ohmic losses ( Figure S-8) [45].…”

Section: Role Of Titania Nanotubes On the Electrochemical Co 2 Rrmentioning

confidence: 99%

Syngas production by electrocatalytic reduction of CO2 using Ag-decorated TiO2 nanotubes

Farkhondehfal

Hernández

Rattalino

et al. 2020

International Journal of Hydrogen Energy

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Huge efforts have been done in the last years on electrochemical and photoelectrochemical reduction of CO 2 to offer a sustainable route to recycle CO 2. A promising route is to electrochemically reduce CO 2 into CO which, by combination with hydrogen, can be used as a feedstock to different added-value products or fuels. Herein, perpendicular oriented TiO 2 nanotubes (NTs) on the electrode plate were grown by anodic oxidation of titanium substrate and then decorated by a low loading of silver nanoparticles deposited by sputtering (i.e. Ag/TiO 2 NTs). Due to their quasi one-dimensional arrangement, TiO 2 NTs are able to provide higher surface area for Ag adhesion and superior electron transport properties than other Ti substrates (e.g. Ti foil and TiO 2 nanoparticles), as confirmed by electrochemical (CV, EIS, electrochemical active surface area) and chemical/morphological analysis (FESEM, TEM, EDS). These characteristics together with the role of the TiO 2 NTs to enhance the stability of CO 2 •intermediate formed due to titania redox couple (Ti IV /Ti III) lead to an improvement of the CO production in the Ag/TiO 2 NTs electrodes. Particular attention has been devoted to reduce the loading of noble metal in the electrode(14.5 %w/%w) and to increase the catalysts active surface area in order to decrease the required overpotential.

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“…However, Pt is not abundant, and the high cost limits its further employment as catalyst layer at the cathode. In recent years, many works focused their attention on the development of new catalyst layers, based on non-precious metal compounds [12,13,14,15,16,17], their alloys and metal-free materials [18,19,20,21,22,23,24,25]. Another class of catalysts important for ORR is comprised of aerobic bacteria, which are able to directly transfer the electrons released from the anode to molecular oxygen.…”

Section: Introductionmentioning

confidence: 99%

Biohybrid Cathode in Single Chamber Microbial Fuel Cell

et al. 2018

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The aim of this work is to investigate the properties of biofilms, spontaneously grown on cathode electrodes of single-chamber microbial fuel cells, when used as catalysts for oxygen reduction reaction (ORR). To this purpose, a comparison between two sets of different carbon-based cathode electrodes is carried out. The first one (Pt-based biocathode) is based on the proliferation of the biofilm onto a Pt/C layer, leading thus to the creation of a biohybrid catalyst. The second set of electrodes (Pt-free biocathode) is based on a bare carbon-based material, on which biofilm grows and acts as the sole catalyst for ORR. Linear sweep voltammetry (LSV) characterization confirmed better performance when the biofilm is formed on both Pt-based and Pt-free cathodes, with respect to that obtained by biofilm-free cathodes. To analyze the properties of spontaneously grown cathodic biofilms on carbon-based electrodes, electrochemical impedance spectroscopy is employed. This study demonstrates that the highest power production is reached when aerobic biofilm acts as a catalyst for ORR in synergy with Pt in the biohybrid cathode.

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Nanostructured MnxOy for oxygen reduction reaction (ORR) catalysts

Cited by 45 publications

References 28 publications

Green‐Synthesized Nitrogen‐Doped Carbon‐Based Aerogels as Environmentally Friendly Catalysts for Oxygen Reduction in Microbial Fuel Cells

Green‐Synthesized Nitrogen‐Doped Carbon‐Based Aerogels as Environmentally Friendly Catalysts for Oxygen Reduction in Microbial Fuel Cells

Syngas production by electrocatalytic reduction of CO2 using Ag-decorated TiO2 nanotubes

Biohybrid Cathode in Single Chamber Microbial Fuel Cell

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