Continuous synthesis of graphene sheets by spray pyrolysis and their use as catalysts for fuel cells

Zou, Biao; Wang, Xiao Xia; Wang, Jiannong

doi:10.1039/c4cc08197h

Cited by 15 publications

(5 citation statements)

References 38 publications

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“…Moreover, the noteworthy broad band 2D is from 2328 cm -1 to 3275 cm -1 , demonstrating that the straticulate folded graphene is in multilayer structure. Numerous graphitic fringes and defects in catalyst will activate the ORR catalytic activity of MOF-FeZn [34][35][36][37][38]. As shown in Fig.…”

Section: Resultsmentioning

confidence: 98%

An ultra-dispersive, nonprecious metal MOF–FeZn catalyst with good oxygen reduction activity and favorable stability in acid

Zhao

Wang

Wang³

et al. 2021

J Mater Sci

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Development of the more stable nonprecious oxygen reduction reaction (ORR) catalyst is of great significance nowadays. Herein, a high-performance iron-doped integral uniform macrocyclic organic framework (MOF–FeZn) catalyst is synthesized through a combined hydrothermal and pyrolysis process, showing favorable ORR activity and stability in acid. This as-synthesized MOF–FeZn catalyst displays high porous and graphitic structures with sufficient catalytic active dopants of pyridinic N, Fe–N, pyrrolic N, graphitic N, making it a promising ORR candidate catalyst with high electrochemical stability. The onset potential, half-wave potential and limited diffusion current density of MOF–FeZn are 0.93 V @ 0.1 mA cm−2, 0.768 V@ 2.757 mA cm−2 and 5.5 mA cm−2, respectively, which are comparable to the state-of-the-art nonprecious catalyst and commercial Pt/C. ORR catalysis on MOF–FeZn follows the nearly four-electron path. What is more, MOF–FeZn can sustain the 10,000 cycles electrochemical potential cycling process in acid with the half-wave potential changed only 21 mV, superior to the reduction of 149 mV for Pt/C. The well-developed integral uniform structures, homogeneously dispersed carbides and nitrides protected by the highly graphitic carbon layers and the better agglomeration suppression of nanoparticles by the confined graphitic carbon layers on catalyst can significantly enhance the catalytic activity and stability of MOF–FeZn.

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Section: Resultsmentioning

confidence: 98%

An ultra-dispersive, nonprecious metal MOF–FeZn catalyst with good oxygen reduction activity and favorable stability in acid

Zhao

Wang

Wang³

et al. 2021

J Mater Sci

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“…Fringes and defects of graphitic structures will activate the catalysis processes on carbon. 27,28,31,32 The porosity was further assessed by N 2 adsorption/ desorption isotherm (Fig. 3c), and the pore properties were analyzed with DFT and HK methods (Fig.…”

Section: Physical Characterization Of Carbon-cladding Catalyst-mor-mentioning

confidence: 99%

“…Thus, more and more investigations of nonprecious SO 2 electrooxidation catalysts initiate to be concerned recently, and the imidazole modified Fe-N-C catalyst is one of the minority recent publications. 25 The metal-nitrogen-carbon catalysts are demonstrated highly active in many electrochemistry processes, [26][27][28] while they are seldom discussed or reported in the process of SO 2 electrooxidation. With excellent catalytic performance toward 2e − or 4e − reaction as well as the cost-effective characteristics, the metal-nitrogen-carbon catalyst is a promising candidate for the 2e − SO 2 electrooxidation process.…”

mentioning

confidence: 99%

Excellent Sulfur Dioxide Electrooxidation Performance and Good Stability on a Fe-N-Doped Carbon-Cladding Catalyst in H₂SO₄

Zhao

Hou

Jiang

et al. 2017

J. Electrochem. Soc.

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This work developed a non-precious carbon-cladding catalyst with excellent SO 2 electrooxidation performance, which was synthesized through pyrolyzing a BP2000 supported composite precursor of melamine and Pluronic F127 dispersed FeCl 3 . This Fe-N-doped catalyst displays the onset and half-wave SO 2 oxidation potential of 0.516 V and 0.629 V, respectively, which are particularly close to those of the Pt/C (JM, 20%). This carbon-cladding catalyst exhibits the higher SO 2 catalytic activity than Pt/C, when the applied oxidation potential is above 1.194 V. Furthermore, stability of this catalyst is also better than Pt/C after the accelerated durability tests in H 2 SO 4 . Based on physical characterizations, the effectively doped Fe-N, well embedded Fe 3 C substances as well as the high surface area, large pore volume and mesoporous structures in the catalyst are synergetic responsible for its excellent SO 2 electrooxidation performance and better stability.

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“…Highly ordered monolayers (2D crystal) of larger G ribbons [88] Pyrolysis -General description Pyrolysis of organic matter [89] Metal-free catalyst of G sheets Spray pyrolysis of iron carbonyl and pyridine [90] -G nanoporous with high specific surface area Spray pyrolysis at different temperatures, graphene oxide-based precursor, nitrogen carrier gas [91] The strong oxidation of graphite produces bulk solid graphite oxide that can be exfoliated in water or other suitable organic solvents to form GO [118][119][120]; several recent reviews report the synthesis of graphite oxide [121][122][123]. Graphite oxide can be prepared with Brodie [124], Staudenmaier [125], and Hummer's [126] methods.…”

Section: Introductionmentioning

confidence: 99%

“…Of these substances, synthetic dyes represent a large group and therefore deserve particular attention, due to the high quantity-more than 800,000 tons-that is produced annually worldwide [3]. About one third of these is released into receiving waters every year through industrial wastewater discharges [4], which may have a severe influence on both the environment In the bottom-up growth of graphene sheets (Table 1), the synthesis of graphene [70] can be obtained via epitaxial growth [71][72][73], chemical vapor deposition (CVD) [74][75][76][77][78][79][80][81][82], electrochemical reduction of CO and CO2 [83,84], arc discharge [85,86], unzipping carbon nanotubes [70,87], organic synthesis [88], and pyrolysis [89][90][91].…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Graphene Based TiO2 Nanocomposites (GTiO2Ns) for Photocatalytic Degradation of Synthetic Dyes

et al. 2017

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Synthetic dyes are widely used in textile, paper, food, cosmetic, and pharmaceutical industries. During industrial processes, some of these dyes are released into the wastewater and their successive release into rivers and lakes produces serious environmental problems. TiO 2 is one of the most widely studied and used photocatalysts for environmental remediation. However, it is mainly active under UV-light irradiation due to its band gap of 3.2 eV, while it shows low efficiency under the visible light spectrum. Regarding the exploration of TiO 2 activation in the visible light region of the total solar spectrum, the incorporation of carbon nanomaterials, such as graphene, in order to form carbon-TiO 2 composites is a promising area. Graphene, in fact, has a large surface area which makes it a good adsorbent for organic pollutants removal through the combination of electrostatic attraction and π-π interaction. Furthermore, it has a high electron mobility and therefore it reduces the electron-hole pair recombination, improving the photocatalytic activity of the semiconductor. In recent years, there was an increasing interest in the preparation of graphene-based TiO 2 photocatalysts. The present short review describes the recent advances in TiO 2 photocatalyst coupling with graphene materials with the aim of extending the light absorption of TiO 2 from UV wavelengths into the visible region, focusing on recent progress in the design and applications in the photocatalytic degradation of synthetic dyes.

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Continuous synthesis of graphene sheets by spray pyrolysis and their use as catalysts for fuel cells

Cited by 15 publications

References 38 publications

An ultra-dispersive, nonprecious metal MOF–FeZn catalyst with good oxygen reduction activity and favorable stability in acid

An ultra-dispersive, nonprecious metal MOF–FeZn catalyst with good oxygen reduction activity and favorable stability in acid

Excellent Sulfur Dioxide Electrooxidation Performance and Good Stability on a Fe-N-Doped Carbon-Cladding Catalyst in H₂SO₄

Recent Advances in Graphene Based TiO2 Nanocomposites (GTiO2Ns) for Photocatalytic Degradation of Synthetic Dyes

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Continuous synthesis of graphene sheets by spray pyrolysis and their use as catalysts for fuel cells

Cited by 15 publications

References 38 publications

An ultra-dispersive, nonprecious metal MOF–FeZn catalyst with good oxygen reduction activity and favorable stability in acid

An ultra-dispersive, nonprecious metal MOF–FeZn catalyst with good oxygen reduction activity and favorable stability in acid

Excellent Sulfur Dioxide Electrooxidation Performance and Good Stability on a Fe-N-Doped Carbon-Cladding Catalyst in H2SO4

Recent Advances in Graphene Based TiO2 Nanocomposites (GTiO2Ns) for Photocatalytic Degradation of Synthetic Dyes

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Excellent Sulfur Dioxide Electrooxidation Performance and Good Stability on a Fe-N-Doped Carbon-Cladding Catalyst in H₂SO₄