Comparison of nitrogen-doped graphene and carbon nanotubes as supporting material for iron and cobalt nanoparticle electrocatalysts toward oxygen reduction reaction in alkaline media for fuel cell applications

Ghanbarlou, Hosna; Rowshanzamir, Soosan; Parnian, Mohammad Javad; Mehri, Foad

doi:10.1016/j.ijhydene.2016.06.005

Cited by 35 publications

(5 citation statements)

References 57 publications

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“…It has no doubt that increasing demands for clean energy 1 . The fuel cell with significant advantage stands out 2 . Alkaline fuel cell is a kind of highly potential energy converter with low emission and high efficiency.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Multi-Doped Porous Carbon/Graphene Derived from Sewage Sludge with Template-Assisted Fe-pillared Montmorillonite for Enhanced Oxygen Reduction Reaction

Chen

et al. 2017

Sci Rep

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Three-dimensional multi-doped porous carbon/graphene (Fe-Mt-SS-C) was prepared by carbonization of sewage sludge with template-assisted Fe-pillared montmorillonite. The material consisted of nanosheet- and particle- carbon had a high specific surface area (784.46 m2·g−1) and hierarchical porous structure of micro-, meso- and macropores. The prepared Fe-Mt-SS-C had a high degree of graphitization and large amount of defect atoms. The pyrolysis process made full use of the C, N, Fe, and S by turning them into the carbon framework of the as-obtained material in situ. Template-assisted Fe-pillared montmorillonite contributed to more characteristics of morphology and composition on Fe-Mt-SS-C than other three materials (SS-C, Mt-SS-C and Fe-SS-C), and enhanced the electrocatalytic ORR activity by providing more adsorption sites and the electronic structure, resulting in the increase of conductivity and electrochemical activity. The ORR activity performance of Fe-Mt-SS-C, including the value of onset potential (0.03 V) and E1/2 (−0.09 V), was better than that of commercial 20 wt% Pt/C (−0.02 V and −0.18 V, respectively). Moreover, the Fe-Mt-SS-C possessed excellent durability and outstanding immunity toward methanol crossover effects. Therefore, the resultant Fe-Mt-SS-C has great potential to applied as a high-efficiency ORR electrocatalyst, more importantly, it realizes the utilization of the sludge at the same time.

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Section: Introductionmentioning

confidence: 99%

Three-Dimensional Multi-Doped Porous Carbon/Graphene Derived from Sewage Sludge with Template-Assisted Fe-pillared Montmorillonite for Enhanced Oxygen Reduction Reaction

Chen

et al. 2017

Sci Rep

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“…It is noted that the unexpected slightly larger semicircle of Co@CEG impedance arcs reflects the complex interfacial charge-transfer resistance brought by the unique hierarchical microstructure. 29,30 For the GC+Co control sample, the introduction of metallic Co nanoparticles could act as potential active sites, exhibiting much improved halfwave potential about −0.25 V, but its limited surface area and large Co particle were not preferred for the electrocatalytic process. Though EG+Co exhibited better activity than GC +Co, indicating that the exfoliated graphene could facilitate the ORR process, this two-step approach faces the relatively complicated exfoliation process plus an additional functionalization process.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Watermelon-like Metallic Co/Graphene-like Nanohybrids from Electrochemical Exfoliation of Anthracite Coal as Superior Oxygen Reduction Reaction Electrocatalyst

Wang

2019

ACS Sustainable Chem. Eng.

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Coal has been employed as both a significant energy supply and resource for the production of modern chemicals and novel carbon materials. Here, we present the synthesis of watermelon-like metallic Co/graphene hybrids with coal as the starting material by approaches of catalytic graphitization, electrochemical exfoliation, and in situ functionalization. The ([BMIm]2[CoCl4]) ion liquid acted as both an electrochemical exfoliation electrolyte and active dopant for the catalyst preparation. It is exhibited that the CoCl4–-based intercalator could be effectively expanded into the gallery region of graphitized coal and resulted in exfoliation of graphene-like nanocarbons. Interestingly, the absorbed Co ligands could be converted into watermelon-like metallic Co encapsulated by 1-butyl-3-methylimidzolium ligand-derived carbons. The electrochemical performance of the Co@CEG catalyst exhibited superior ORR activity to benchmark Pt-C with excellent half-wave potential, higher current density, a direct four-electron pathway, superior methanol tolerance, and stability. This work provides an alternative methodology for the production of graphene-like functional nanocarbons from coal with promising potential in energy conversion applications.

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“…An oxygen reduction reaction (ORR) is an essential reaction in electrochemical oxidation processes, since it produces hydrogen peroxide, which is an important intermediate for hydroxyl radical production. There are several papers in recent years showing that nitrogen-doped carbon nanomaterials are effective electrocatalysts toward oxygen reduction reactions [24][25][26][27][28][29]. Research in this area shows that catalysts containing nitrogen-doped carbon nanomaterials (including graphene, carbon nanotubes, mesoporous carbon, etc.)…”

Section: Introductionmentioning

confidence: 99%

Nitrogen-Doped Graphene Iron-Based Particle Electrode Outperforms Activated Carbon in Three-Dimensional Electrochemical Water Treatment Systems

Ghanbarlou

Pedersen

Simonsen

et al. 2020

Water

Self Cite

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The synergy between electrochemical oxidation and adsorption on particle electrodes was investigated in three-dimensional (3D) systems for p-nitrosodimethylaniline (RNO) decolorization and pesticide removal. A comparison was made between granular activated carbon (GAC) and a novel synthesized nitrogen-doped graphene-based particle electrode (NCPE). Experiments on RNO decolorization show that the synergy parameter of the 3D-NCPE system was improved 3000 times compared to the studied 3D-GAC system. This was due to the specific nanostructure and composition of the NCPE material. Nitrogen-doped graphene triggered an oxygen reduction reaction, producing hydrogen peroxide that simultaneously catalyzed on iron sites of the NCPEs to hydroxyl radicals following the electro-Fenton (EF) process. Data showed that in the experimental setup used for the study, the applied cell voltage required for the optimal value of the synergy parameter could be lowered to 5V in the 3D-NCPEs process, which is significantly better than the 15–20 V needed for synergy to be found in the 3D-GAC process. Compared to previous studies with 3D-GAC, the removal of pesticides 2,6 dichlorobenzamide (BAM), 2-methyl-4-chlorophenoxyaceticacid (MCPA), and methylchlorophenoxypropionic acid (MCPP) was also enhanced in the 3D-NCPE system.

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Comparison of nitrogen-doped graphene and carbon nanotubes as supporting material for iron and cobalt nanoparticle electrocatalysts toward oxygen reduction reaction in alkaline media for fuel cell applications

Cited by 35 publications

References 57 publications

Three-Dimensional Multi-Doped Porous Carbon/Graphene Derived from Sewage Sludge with Template-Assisted Fe-pillared Montmorillonite for Enhanced Oxygen Reduction Reaction

Three-Dimensional Multi-Doped Porous Carbon/Graphene Derived from Sewage Sludge with Template-Assisted Fe-pillared Montmorillonite for Enhanced Oxygen Reduction Reaction

Watermelon-like Metallic Co/Graphene-like Nanohybrids from Electrochemical Exfoliation of Anthracite Coal as Superior Oxygen Reduction Reaction Electrocatalyst

Nitrogen-Doped Graphene Iron-Based Particle Electrode Outperforms Activated Carbon in Three-Dimensional Electrochemical Water Treatment Systems

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