Tuning α-Fe<sub>2</sub>O<sub>3</sub> nanotube arrays for the oxygen reduction reaction in alkaline media

Xue, Yudong; Jin, Wei; Du, Hao; Wang, Shaona; Zheng, Shili; Zhang, Yi

doi:10.1039/c6ra06422a

Cited by 34 publications

(18 citation statements)

References 50 publications

(52 reference statements)

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“…When subjected to the codoping process, CNOs increase their activity, as witnessed by the larger electron-transfer number, namely, 3.94. Such a high value is among the largest ever reported for doped C-based materials ,,,,,, and also considering other cost-effective ORR catalysts, , being quite close to that of reference Pt/C and the theoretical one (i.e., 4), as reported in Figure B. These results once again prove that the codoping of CNOs is an effective route to improving their electrochemical activity.…”

Section: Resultssupporting

confidence: 85%

Boron/Nitrogen-Codoped Carbon Nano-Onion Electrocatalysts for the Oxygen Reduction Reaction

Camisasca

Sacco

Brescia

et al. 2018

ACS Appl. Nano Mater.

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Herein, we present the production of dualatom (B and N)-codoped carbon nano-onions (BN-CNOs) by a standard annealing method. The proposed codoping approach is efficient to introduce both heteroatoms in the graphitic skeleton, as revealed by several characterization techniques, and suitable for a low-cost mass production of Cbased catalysts. The activity of the CNO-based electrocatalysts toward oxygen reduction reaction has been investigated in alkaline media, showing comparable catalytic performance, higher long-term stability (retaining 98.7% of the initial current over 3 h of testing), and excellent immunity toward methanol crossover compared to the standard Pt/Cbased catalysts. Our findings confirm that B/N-codoped CNOs are promising candidates to efficiently catalyze the oxygen reduction in energy devices.

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Section: Resultssupporting

confidence: 85%

Boron/Nitrogen-Codoped Carbon Nano-Onion Electrocatalysts for the Oxygen Reduction Reaction

Camisasca

Sacco

Brescia

et al. 2018

ACS Appl. Nano Mater.

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“…However, the incorporation of Cu and Fe resulted in higher current density than the pristine MnO 2 . Compared to previous research of catalysts containing MnO 2 , CuO, and Fe 2 O 3 compounds, it was found that their long‐term electrochemical stability has improved [174–183] …”

Section: Resultscontrasting

confidence: 60%

Cu‐ and Fe‐Incorporated Manganese Oxides (Mn_xO_y) as Cathodic Catalysts for Hydrogen Peroxide Reduction (HPR) and Oxygen Reduction (OR) in Micro‐direct Methanol Fuel Cells

et al. 2022

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Improving manganese oxides as cathodic catalysts in direct methanol/hydrogen peroxide fuel cells by incorporation of Cu and Fe to promote oxygen reduction (OR) and hydrogen peroxide reduction (HPR) is reported. The Cu‐incorporated and Fe‐incorporated MnxOy were prepared by impregnation and solvothermal processes. From XRD, XPS, and XAS analyses, the obtained MnxOy consisted of MnO2 and mixed phases of Mn3O4 and Mn2O3 from impregnation and solvothermal methods, respectively. The Cu‐incorporated and Fe‐incorporated MnxOy included CuO and Fe2O3, respectively, through both methods. Addition of Cu and Fe decreased the BET surface area and increased the pore sizes as compared to the pristine MnO2. With the Fe : Mn molar ratio of 0.20 : 1, the Fe‐incorporated MnxOy from the solvothermal method presented the highest cathodic peaks under the cyclic voltammogram of HPR and OR at around 0.59 V of 11.59 mA cm−2 and −0.59 V of −12.33 mA cm−2, respectively. Compared to the Cu‐incorporated ones, the highest HPR peak at 0.68 V of 9.20 mA cm−2 and the highest OR peak at −0.59 V of −6.99 mA cm−2 were obtained from the Cu‐incorporated MnxOy prepared through the solvothermal method at the Cu : Mn molar ratio of 0.15 : 1. Incorporating Cu or Fe into MnO2 brought the improvement of electrocatalytic activity for HPR and OR. The Cu‐incorporated and Fe‐incorporated MnxOy from both methods showed a higher power density of μ‐DMFC than the pristine MnO2.

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“…Just to cite some example, Gorlin et al . synthetized Mn 3 O 4 nanoparticles which showed good activity toward the ORR, while Xue and co‐workers fabricated α‐Fe 2 O 3 nanotube arrays characterized by a predominant 4‐electrons pathway, even if applications of iron oxides as ORR catalysts are still very few. Concerning the doped carbonaceous materials, in addition to porous carbon (often employed as support for other most‐performing catalysts), carbon nanotubes, graphite aerogels or graphene/reduced graphene oxide (rGO) were proved to be effective low‐cost catalysts alternative to Pt.…”

Section: Introductionmentioning

confidence: 99%

One‐Pot Microwave‐Assisted Synthesis of Reduced Graphene Oxide/Iron Oxide Nanocomposite Catalyst for the Oxygen Reduction Reaction

et al. 2016

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We report on a reliable and eco-friendly procedure for the synthesis of reduced graphene oxide/Fe 2 O 3 nanocomposite via a fast microwave-assisted one-pot reduction and functionalization of graphene oxide. Morphology, structure and electrochemical behavior of the as-prepared material were characterized through different techniques. Structural and morphological characterizations evidenced the formation of nanocomposite sheets, with iron oxide nanoparticles in-tegrated in the graphene matrix. Physico-chemical analysis revealed the functionalization of the graphene also by the presence of nitrogen atoms that show synergistic catalysis effects with Fe 2 O 3 . Electrochemical characterizations put in evidence the ability of such material to exploit competitive performances for the oxygen reduction reaction, comparable to Pt-based catalysts, commonly used for fuel cell applications.

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Tuning α-Fe₂O₃ nanotube arrays for the oxygen reduction reaction in alkaline media

Abstract: α-Fe2O3 nanotube arrays were fabricated and employed as low cost non-noble electrocatalysts for the oxygen reduction reaction (ORR). As-prepared α-Fe2O3 nanotube arrays exhibit excellent ORR catalytic activity and durability in alkaline media.

Cited by 34 publications

References 50 publications

Boron/Nitrogen-Codoped Carbon Nano-Onion Electrocatalysts for the Oxygen Reduction Reaction

Boron/Nitrogen-Codoped Carbon Nano-Onion Electrocatalysts for the Oxygen Reduction Reaction

Cu‐ and Fe‐Incorporated Manganese Oxides (Mn_xO_y) as Cathodic Catalysts for Hydrogen Peroxide Reduction (HPR) and Oxygen Reduction (OR) in Micro‐direct Methanol Fuel Cells

One‐Pot Microwave‐Assisted Synthesis of Reduced Graphene Oxide/Iron Oxide Nanocomposite Catalyst for the Oxygen Reduction Reaction

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Tuning α-Fe2O3 nanotube arrays for the oxygen reduction reaction in alkaline media

Abstract: α-Fe2O3 nanotube arrays were fabricated and employed as low cost non-noble electrocatalysts for the oxygen reduction reaction (ORR). As-prepared α-Fe2O3 nanotube arrays exhibit excellent ORR catalytic activity and durability in alkaline media.

Cited by 34 publications

References 50 publications

Boron/Nitrogen-Codoped Carbon Nano-Onion Electrocatalysts for the Oxygen Reduction Reaction

Boron/Nitrogen-Codoped Carbon Nano-Onion Electrocatalysts for the Oxygen Reduction Reaction

Cu‐ and Fe‐Incorporated Manganese Oxides (MnxOy) as Cathodic Catalysts for Hydrogen Peroxide Reduction (HPR) and Oxygen Reduction (OR) in Micro‐direct Methanol Fuel Cells

One‐Pot Microwave‐Assisted Synthesis of Reduced Graphene Oxide/Iron Oxide Nanocomposite Catalyst for the Oxygen Reduction Reaction

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Product

Resources

About

Tuning α-Fe₂O₃ nanotube arrays for the oxygen reduction reaction in alkaline media

Cu‐ and Fe‐Incorporated Manganese Oxides (Mn_xO_y) as Cathodic Catalysts for Hydrogen Peroxide Reduction (HPR) and Oxygen Reduction (OR) in Micro‐direct Methanol Fuel Cells