Preparation of metal-free electrocatalysts from cassava residues for the oxygen reduction reaction: A sulfur functionalization approach

Mena-Durán, Cinthia J.; Alonso-Lemus, I. L.; Quintana, P.; Barbosa, Romeli; Ordóñez, L. C.; Escobar, Beatriz

doi:10.1016/j.ijhydene.2017.12.139

Cited by 22 publications

(10 citation statements)

References 27 publications

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“…Raman spectra of the SOPRAW and biochars obtained are shown in Figure 6 . SOPRAW does not show any characteristic band, while SOP400, SOP600, and SOP800 show two broad and overlapping peaks, with a maximum intensity at 1363 cm -1 and 1590 cm -1 , which correspond to the D and G bands of the graphitic-like structures, respectively [ 46 ]. The D band is related to sp 3 type defective sites in the graphitic plane and disorder, while the G band results from the vibrational mode of the graphite crystalline planes [ 10 , 47 ].…”

Section: Resultsmentioning

confidence: 99%

Physicochemical and Optical Characterization of Citrus aurantium Derived Biochar for Solar Absorber Applications

et al. 2021

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Agro-industrial waste valorization is an attractive approach that offers new alternatives to deal with shrinkage and residue problems. One of these approaches is the synthesis of advanced carbon materials. Current research has shown that citrus waste, mainly orange peel, can be a precursor for the synthesis of high-quality carbon materials for chemical adsorption and energy storage applications. A recent approach to the utilization of advanced carbon materials based on lignocellulosic biomass is their use in solar absorber coatings for solar-thermal applications. This study focused on the production of biochar from Citrus aurantium orange peel by a pyrolysis process at different temperatures. Biochars were characterized by SEM, elemental analysis, TGA-DSC, FTIR, DRX, Raman, and XPS spectroscopies. Optical properties such as diffuse reflectance in the UV−VIS−NIR region was also determined. Physical-chemical characterization revealed that the pyrolysis temperature had a negative effect in yield of biochars, whereas biochars with a higher carbon content, aromaticity, thermal stability, and structural order were produced as the temperature increased. Diffuse reflectance measurements revealed that it is possible to reduce the reflectance of the material by controlling its pyrolysis temperature, producing a material with physicochemical and optical properties that could be attractive for use as a pigment in solar absorber coatings.

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Section: Resultsmentioning

confidence: 99%

Physicochemical and Optical Characterization of Citrus aurantium Derived Biochar for Solar Absorber Applications

et al. 2021

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“…The traditional noble metal catalysts, such as Pt based catalyst, are costly which limited their applications [10–12] . At the same time, although some non‐noble metal‐based catalysts are reported as alternatives, the ultimate choice of the lowest cost is the metal‐free catalyst [13–18] …”

Section: Introductionmentioning

confidence: 99%

“…After all transition metals are also important resources, especially with the increasing depletion. In addition, it has been ignored by researchers that almost all reported ORR catalysts were used directly after synthesis without any further post‐treatments process [13,31–36] . The post‐treatment method which can further improve the ORR performance without introducing transition metal elements is worthy of researchers′ attention.…”

Section: Introductionmentioning

confidence: 99%

“…[10][11][12] At the same time, although some nonnoble metal-based catalysts are reported as alternatives, the ultimate choice of the lowest cost is the metal-free catalyst. [13][14][15][16][17][18] Heteroatom-doped carbon catalysts, as the metal-free ORR catalysts, have been numerously studied. [8,[16][17][18][19][20] The carbon matrix doped with nitrogen, phosphorus, sulfur or boron has the possibilities of possessing excellent ORR catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, it has been ignored by researchers that almost all reported ORR catalysts were used directly after synthesis without any further posttreatments process. [13,[31][32][33][34][35][36] The post-treatment method which can further improve the ORR performance without introducing transition metal elements is worthy of researchers' attention. For example, the subtraction strategies such as cleaning the catalyst surface with suitable organic solvents may better expose the ORR active sites.…”

Section: Introductionmentioning

confidence: 99%

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Study on the Simple Surface Treatments of N, P Dual‐doped Carbon as Metal‐free Catalyst for Metal‐air Batteries

Zhang

2020

ChemCatChem

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N, P dual‐doped porous carbon with high specific surface area of ∼2000 m2 g−1 was prepared via foaming‐carbonization process. It was demonstrated that the simple surface treatment and modification can conveniently further improve the catalytic performance of oxygen reduction reaction (ORR). The results showed that chemisorbed phosphorus can promote the surface treatment of sodium borohydride (NaBH4). The modified novel sites, adsorbing water molecules of a semi‐free state, promoted the offensive key steps of H2O molecules in ORR. After post‐treatment, the limit current density increased from 5.0 to 6.1 mA cm−2 with a decreased Tafel slope and the onset potential positively shifted. This surface‐modified catalyst was applied to Zn‐air battery and Al‐air battery, and had exhibited good applicability and excellent performances. This work illustrates that the simple post‐treatments can conveniently and effectively improve the ORR performance of metal‐free carbon catalysts.

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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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Preparation of metal-free electrocatalysts from cassava residues for the oxygen reduction reaction: A sulfur functionalization approach

Cited by 22 publications

References 27 publications

Physicochemical and Optical Characterization of Citrus aurantium Derived Biochar for Solar Absorber Applications

Physicochemical and Optical Characterization of Citrus aurantium Derived Biochar for Solar Absorber Applications

Study on the Simple Surface Treatments of N, P Dual‐doped Carbon as Metal‐free Catalyst for Metal‐air Batteries

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

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