Sulfur doped carbon nanohorns towards oxygen reduction reaction

Macias, Elizabeth Montiel; Valenzuela-Muñiz, Ana María; Alonso-Núñez, G.; Sánchez, Mario H. Farías; Gauvin, Raynald; Verde-Gómez, Ysmael

doi:10.1016/j.diamond.2019.107671

Cited by 21 publications

(22 citation statements)

References 82 publications

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“…164, 285 and 533, respectively, are evident (Figure 3c). Moreover, the S content was determined to be 3%, higher than that reported for S-doped graphene [31] and previously prepared S-doped CNHs [26]. To probe the chemical state of sulfur in S-CNHs high-resolution S2p peaks were analyzed (Figure 3d).…”

Section: Resultsmentioning

confidence: 81%

Sulfur-Doped Carbon Nanohorn Bifunctional Electrocatalyst for Water Splitting

2020

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Sulfur-doped carbon nanohorns (S-CNHs) were prepared by an easy one-pot solvothermal process and were employed as efficient electrocatalysts towards water splitting. Initially, oxidation of CNHs followed by thermal treatment with the Lawesson’s reagent resulted in the formation of S-CNHs with the sulfur content determined as high as 3%. The S-CNHs were thoroughly characterized by spectroscopic, thermal and electron microscopy imaging means and then electrocatalytically screened. Specifically, S-CNHs showed excellent activity and durability for both O2 and H2 evolution reactions, by showing low overpotential at 1.63 and −0.2 V vs. RHE for oxygen and hydrogen evolution reaction, respectively. Additionally, S-CNHs showed significantly lower Tafel slope value and lower current resistance compared to oxidized and pristine CNHs for both electrocatalytic reactions. The outstanding electrocatalytic properties and high conductivity, along with the high S-doping level, render S-CNHs a promising bifunctional electrocatalyst for water splitting.

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Section: Resultsmentioning

confidence: 81%

Sulfur-Doped Carbon Nanohorn Bifunctional Electrocatalyst for Water Splitting

2020

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“…The N-doped CNHs demonstrated significantly improved electrocatalytic activity for ORR compared to intact CNHs, resulting from the enriched edges with pyridinic-N atoms and the good electrical conductivity and excellent mass transport guaranteed from the inherent spherical three-dimensional quality of CNHs. In this context, the influence of Fe concentration was evaluated in the preparation of sulfur-doped CNHs regarding their morphology, chemical, and electrochemical properties [70]. The modified chemical vapor deposition method with ferrocene gave the most well-defined tubular nanostructures, with conical and cone-like shapes at lower Fe amounts.…”

Section: Oxygen Reductionmentioning

confidence: 99%

Carbon Nanohorn-Based Electrocatalysts for Energy Conversion

Kagkoura

Tagmatarchis

2020

Nanomaterials

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In the context of even more growing energy demands, the investigation of alternative environmentally friendly solutions, like fuel cells, is essential. Given their outstanding properties, carbon nanohorns (CNHs) have come forth as promising electrocatalysts within the nanocarbon family. Carbon nanohorns are conical nanostructures made of sp2 carbon sheets that form aggregated superstructures during their synthesis. They require no metal catalyst during their preparation and they are inexpensively produced in industrial quantities, affording a favorable candidate for electrocatalytic reactions. The aim of this article is to provide a comprehensive overview regarding CNHs in the field of electrocatalysis and especially, in oxygen reduction, methanol oxidation, and hydrogen evolution, as well as oxygen evolution from water splitting, underlining the progress made so far, and pointing out the areas where significant improvement can be achieved.

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“…Partially replacing carbon atoms in the carbon nanomaterials with N, P, S, or B, etc. can cause the redistribution of the charge and spin densities around the carbon atoms, thus improving the electrocatalytic activity of the nanomaterials [17–19] . Although these metal‐free catalysts have great application prospects in many fields, their properties are still unsatisfactory.…”

Section: Introductionmentioning

confidence: 99%

“…can cause the redistribution of the charge and spin densities around the carbon atoms, thus improving the electrocatalytic activity of the nanomaterials. [17][18][19] Although these metal-free catalysts have great application prospects in many fields, their properties are still unsatisfactory. Earth-abundant transition metals (TMs) such as Fe, Ni, and Co are among the most promising non-noble metal catalysts in electrochemistry, owing to their high theoretical activity and low cost.…”

Section: Introductionmentioning

confidence: 99%

Fe‐Ni₂P@NPC Synthesized by Trametes Orientalis as an Efficient Electrocatalyst for the Oxygen Evolution Reaction

Jia

Lei

et al. 2023

ChemCatChem

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Developing non‐noble metal catalysts for the oxygen evolution reaction (OER) is one of the main challenges in the production of hydrogen energy by water splitting reaction. Herein, taking advantage of the fact that microorganisms have high element contents and metabolic activities, we used them to recycle Ni and Fe from electroplating sludge. Based on the above, we designed a highly efficient oxygen evolution catalyst (Fe‐Ni2P@NPC) through the in situ synthesis of Fe‐doped Ni2P nanoparticles and N, P dual‐doped carbon materials coupled together. The material exhibited excellent catalytic activity, with a low overpotential of 282 mV at the current density of 10 mA cm−2 along with a fast reaction kinetics, with a small Tafel slope of 57.1 mV dec−1. This outstanding OER performance is mainly attributed to the in situ doping of Fe in Ni2P nanoparticles, resulting in a strong synergistic effect between them. Besides, the strong coupling interaction between Fe‐Ni2P and Fe‐NiOOH formed during the OER can adjust the electron distribution and optimize the adsorption capacity of the intermediates. This work provides a reference for the recycling of valuable Ni and Fe metals from electroplating sludge, as well as new insight into the preparation of low‐cost and high‐performance OER catalysts.

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Sulfur doped carbon nanohorns towards oxygen reduction reaction

Cited by 21 publications

References 82 publications

Sulfur-Doped Carbon Nanohorn Bifunctional Electrocatalyst for Water Splitting

Sulfur-Doped Carbon Nanohorn Bifunctional Electrocatalyst for Water Splitting

Carbon Nanohorn-Based Electrocatalysts for Energy Conversion

Fe‐Ni₂P@NPC Synthesized by Trametes Orientalis as an Efficient Electrocatalyst for the Oxygen Evolution Reaction

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Sulfur doped carbon nanohorns towards oxygen reduction reaction

Cited by 21 publications

References 82 publications

Sulfur-Doped Carbon Nanohorn Bifunctional Electrocatalyst for Water Splitting

Sulfur-Doped Carbon Nanohorn Bifunctional Electrocatalyst for Water Splitting

Carbon Nanohorn-Based Electrocatalysts for Energy Conversion

Fe‐Ni2P@NPC Synthesized by Trametes Orientalis as an Efficient Electrocatalyst for the Oxygen Evolution Reaction

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Fe‐Ni₂P@NPC Synthesized by Trametes Orientalis as an Efficient Electrocatalyst for the Oxygen Evolution Reaction