Comparison of porous carbons derived from sodium alginate and calcium alginate and their electrochemical properties

Li, Ming; Han, Kuihua; Teng, Zhaocai; Li, Jinxiao; Wang, Meimei; Li, Xian

doi:10.1039/c9ra09317f

Cited by 7 publications

(4 citation statements)

References 48 publications

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“…The SEM images with EDS analysis are given in Figure 2. A well-resolved planar structure is expected for alginate-derived carbons [40] and can be clearly seen for C/Fe and C/Fe.N samples, where a neatly connected alginate network was preserved after carbonization (Figure 2). The layered structure may be seen at different imaging angles and is best identified for C/Fe.N (Figure 2, left).…”

Section: Microscopymentioning

confidence: 79%

Electrochemical Crosslinking of Alginate—Towards Doped Carbons for Oxygen Reduction

et al. 2023

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Electrochemical crosslinking of alginate strands by in situ iron oxidation was explored using a potentiostatic regime. Carbon-based materials co-doped with iron, nitrogen, and/or sulfur were prepared via electrolyte composition variation with a nitrogen-rich compound (rivanol) or through post-treatments with sodium sulfide. Nanometer-sized iron particles were confirmed by transmission and field emission scanning electron microscopy in all samples as a consequence of the homogeneous dispersion of iron in the alginate scaffold and its concomitant growth-limiting effect of alginate chains. Raman spectra confirmed a rise in structural disorder with rivanol/Na2S treatment, which points to more defect sites and edges known to be active sites for oxygen reduction. Fourier transform infrared (FTIR) spectra confirmed the presence of different iron, nitrogen, and sulfur species, with a marked difference between Na2S treated/untreated samples. The most positive onset potential (−0.26 V vs. saturated calomel electrode, SCE) was evidenced for the sample co-doped with N, S, and Fe, surpassing the activity of those with single and/or double doping. The mechanism of oxygen reduction in 0.1 M KOH was dominated by the 2e− reduction pathway at low overpotentials and shifted towards complete 4e− reduction at the most negative explored values. The presented results put forward electrochemically formed alginate gels functionalized by homogeneously dispersed multivalent cations as an excellent starting point in nanomaterial design and engineering.

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Section: Microscopymentioning

confidence: 79%

Electrochemical Crosslinking of Alginate—Towards Doped Carbons for Oxygen Reduction

et al. 2023

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“…Two common methods to fabricate the porosity of carbon materials are the hard-templating method and the soft-templating method ( Figure 1 a). Soft templates are constructed using amphiphilic surfactants and precursor moieties, while hard templates are created via nanocasting, where the structures of inorganic solid materials are replicated into porous carbon materials [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

A Gram Scale Soft-Template Synthesis of Heteroatom Doped Nanoporous Hollow Carbon Spheres for Oxygen Reduction Reaction

Kang,

Kim,

Han

et al. 2023

Nanomaterials

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Heteroatom-doped nanoporous carbon materials with unique hierarchical structures have been shown to be promising supports and catalysts for energy conversion; however, hard-template methods are limited by their inflexibility and time-consuming process. Soft-template methods have been suggested as an alternative, but they are limited by their picky requirements for stable reactions and the few known precursors for small-batch synthesis. In this study, a gram-scale soft-template-based silica-assisted method was investigated for producing nitrogen-doped hollow nanoporous carbon spheres (N-HNCS). Nitrogen doping is accomplished during preparation with enhanced electrocatalytic activity without complicating the methodology. To investigate the effect of the unique structural characteristics of N-HNCS (specific surface area: 1250 m2 g−1; pore volume: 1.2 cm3 g−1), cobalt was introduced as an active center for the oxygen reduction reaction. Finely tuned reaction conditions resulted in well-dispersed cobalt particles with minimal agglomeration. This sheds light on the advancement of new experimental procedures for developing more active and promising non-noble catalysts in large and stable batches.

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“…9–11 Fossil fuels are the primary raw material for producing activated carbon but this method is not very economical and is not conducive to protecting non-renewable resources. 12–14 Biomass, another production source of activated carbon, has become a good resource due to its low cost, abundance, easy access, and renewability. 15–18…”

Section: Introductionmentioning

confidence: 99%

“…[9][10][11] Fossil fuels are the primary raw material for producing activated carbon but this method is not very economical and is not conducive to protecting non-renewable resources. [12][13][14] Biomass, another production source of activated carbon, has become a good resource due to its low cost, abundance, easy access, and renewability. [15][16][17][18] Activated carbon from biomass is usually prepared by carbonization and activation of the biomass, where chemical activation of potassium hydroxide (KOH) contributes significantly to the specific surface area and pore structure of the biomass-activated carbon.…”

Section: Introductionmentioning

confidence: 99%

Preparation of porous biochar and its application in supercapacitors

Ding

et al. 2022

New J. Chem.

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Comparison of porous carbons derived from sodium alginate and calcium alginate and their electrochemical properties

Abstract: Comparisons of the microstructures and electrochemical properties of porous carbons derived from the carbon-forming component alginic acid under the action of Na/Ca.

Cited by 7 publications

References 48 publications

Electrochemical Crosslinking of Alginate—Towards Doped Carbons for Oxygen Reduction

Electrochemical Crosslinking of Alginate—Towards Doped Carbons for Oxygen Reduction

A Gram Scale Soft-Template Synthesis of Heteroatom Doped Nanoporous Hollow Carbon Spheres for Oxygen Reduction Reaction

Preparation of porous biochar and its application in supercapacitors

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