Self-doped Sargassum spp. derived biocarbon as electrocatalysts for ORR in alkaline media

Pérez-Salcedo, K.Y.; Alonso-Lemus, I. L.; Quintana, P.; Mena-Durán, Cinthia J.; Barbosa, Romeli; Escobar, Beatriz

doi:10.1016/j.ijhydene.2018.10.073

Cited by 28 publications

(12 citation statements)

References 44 publications

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Section: X-ray Diffraction and Physical-chemical Analysissupporting

confidence: 89%

“…The planes characteristics of each phase are shown in Figure 5. These compounds were present throughout the anatomy of Sargassum spp., from stem to leaves, as was previously recorded in other scientific studies [56][57][58][59] and demonstrated in this study using scanning electron microscopy (SEM, Figure 6). SEM analysis (Figure 6) revealed the morphology of Sargassum spp., showing that the results of the elemental chemical composition determined by energy-dispersive X-ray spectroscopy (EDS) (Figure 6a,b) correspond to the phases of the compounds identified by DRX (Figure 6).…”

Section: X-ray Diffraction and Physical-chemical Analysissupporting

confidence: 89%

“…X-ray diffraction analysis (Figure 5) identified compounds already reported for Sargassum spp. in earlier studies, such as calcium carbonate and dolomite (calcium-magnesium carbonate) [56,57]. The planes characteristics of each phase are shown in Figure 5.…”

Section: X-ray Diffraction and Physical-chemical Analysismentioning

confidence: 88%

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A Prospective Study of the Exploitation of Pelagic Sargassum spp. as a Solid Biofuel Energy Source

López-Sosa¹,

Alvarado-Flores

Corral-Huacuz³

et al. 2020

Applied Sciences

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This study presents a prospective study for the potential exploitation of pelagic Sargassum spp. as a solid biofuel energy source. It was carried out in three stages. First we conducted a morphological, physical-chemical, and structural characterization using scanning electron microscopy (SEM), infrared spectroscopy (FTIR), and X-ray diffraction (DRX), respectively. Second we evaluated the material’s functional properties as a solid biofuel based on its calorific value and the quantification of polymeric components like hemicellulose, cellulose, and lignin, as well as thermogravimetric and differential analysis to study the kinetics of its pyrolysis and determine parameters like activation energy (Ea), reaction order (n), and the pre-exponential factor (Z). Third we analyzed the energetic potential considering the estimated volume of pelagic Sargassum spp. that was removed from beaches along the Mexican Caribbean coast in recent years. Results of the kinetic study indicate that Sargassum spp. has an enormous potential for use as a complement to other bioenergy sources. Other results show the high potential for exploiting these algae as an energy source due to the huge volumes that have inundated Caribbean, West African, and northern Brazil shorelines in recent years. As a solid biofuel, Sargassum spp. has a potential energy the order of 0.203 gigajoules (GJ)/m3. In the energy matrix of the residential sector in Mexico, its potential use as an energy source is comparable to the national consumption of firewood. The volume of beachcast Sargassum spp. that was removed from ~8 km of coastline around Puerto Morelos, Mexico in 2018–2019, could have generated over 40 terajoules/year of solid biofuel.

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Section: X-ray Diffraction and Physical-chemical Analysissupporting

confidence: 89%

Section: X-ray Diffraction and Physical-chemical Analysissupporting

confidence: 89%

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A Prospective Study of the Exploitation of Pelagic Sargassum spp. as a Solid Biofuel Energy Source

López-Sosa¹,

Alvarado-Flores

Corral-Huacuz³

et al. 2020

Applied Sciences

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“…Electrocatalysts were prepared according to the method reported previously by Perez-Salcedo K. Y. et al [39], but pyrolysis was performed in an argon atmosphere at three different temperatures, meaning that the activated samples were denoted as 700, 750, and 800. After activation, doping treatment was performed with pyridine (C 5 H 5 N, Sigma-Aldrich, 99.8%, Saint Louis, MO, USA) as a nitrogen source.…”

Section: Metal-free Electrocatalyst Synthesismentioning

confidence: 99%

“…After C 5 H 5 N doping, a low amount of nitrogen was incorporated to the material, which, according to previous studies, can be tuned by manipulating the solvothermal treatment temperature. On the other hand, seaweeds contain sodium alginate [41] and high amounts of calcium carbonate (CaCO 3 ) [39], therefore, the samples pyrolyzed at the highest temperature (800 and N800) showed the highest post-pyrolysis carbon amount (68.86 and 80.95 wt %, respectively) among all samples. Finally, the sulfur content was low for the 700 and 750 samples, lower than the detection limit for 800, and dropped to zero after doping treatment for all three sample types.…”

Section: Physicochemical Characterizationmentioning

confidence: 99%

N-Doped Porous Carbon from Sargassum spp. as Efficient Metal-Free Electrocatalysts for O2 Reduction in Alkaline Fuel Cells

et al. 2019

Self Cite

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This work reports the synthesis of N-doped porous carbon (NPC) with a high surface area from Sargassum spp. as a low-cost alternative for electrocatalyst production for the oxygen reduction reaction (ORR). Sargassum spp. was activated with potassium hydroxide at different temperatures (700, 750, and 800 °C) and then doped with pyridine (N700, N750, and N800). As a result of the activation process, the 800 °C sample showed a high surface area (2765 m2 g−1) and good onset potential (0.870 V) and current density (4.87 mA cm−2). The ORR performance of the electrocatalysts in terms of their current density was N800 > N750 > N700 > 750 > 800 > 700, while the onset potential decreased in the following order: N800 > 800 > 750 > 700 > N700 > N750. The fuel cell performance of the membrane electrode assembly (MEA) prepared with electrocatalyst synthesized at 750 °C and doped with pyridine was 12.72 mW cm−2, which was close to that from Pt/C MEA on both the anode and cathode (14.42 mW cm−2). These results indicate that NPCs are an alternative to the problem of Sargassum spp. accumulation in the Caribbean due to their high efficiency as electrocatalysts for ORR.

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Waste‐Derived Biocarbons as Nonnoble Metal Catalysts and Supports for Nanocatalysts for Fuel Cells Reactions in Alkaline Media

Rodríguez‐Varela

Alonso-Lemus

2021

Encyclopedia of Electrochemistry

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Encouraging results have been obtained from the characterization and testing of biocarbons derived from widely available waste biomass, foreseeing their use in anion exchange membrane fuel cells (AEMFC). Pyrolysis is the most common route to synthetize biocarbons from biomass, but hydro‐ and solvothermal treatments have gained attention because of the possibility of developing hierarchically ordered structures. In most cases, biocarbons from biomass are self‐doped with heteroatoms, although the relative concentration of those species can be increased by doping during the thermal treatment of the biomass. Moreover, their surface chemistry can be modified to create functional groups that act as centers for the adsorption of molecules and the anchorage of nanoparticles. The most common application of the structurally disorder and amorphous biocarbons is as self‐standing metal‐free electrocatalysts for the oxygen reduction reaction (ORR). To a lesser extent, biocarbons have been investigated as supports of noble metal and nonnoble metal nanoparticles. In the first case, the application has been mostly as anodes for the oxidation of organic molecules, since Pt and Pd are highly active for such reactions. In the second, the impregnation of biocarbons mainly with Co and Fe nanoparticles has promoted a high catalytic activity for the ORR. Being produced from cheap biomass resources, the technological challenge of biocarbons is to achieve the high electrocatalytic performance required to contend with, and eventually replace, the benchmark Pt/C (as electrocatalysts) and Vulcan XC‐72 (as support).

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Self-doped Sargassum spp. derived biocarbon as electrocatalysts for ORR in alkaline media

Cited by 28 publications

References 44 publications

A Prospective Study of the Exploitation of Pelagic Sargassum spp. as a Solid Biofuel Energy Source

A Prospective Study of the Exploitation of Pelagic Sargassum spp. as a Solid Biofuel Energy Source

N-Doped Porous Carbon from Sargassum spp. as Efficient Metal-Free Electrocatalysts for O2 Reduction in Alkaline Fuel Cells

Waste‐Derived Biocarbons as Nonnoble Metal Catalysts and Supports for Nanocatalysts for Fuel Cells Reactions in Alkaline Media

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