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Akhila Kumar Sahu - One of the best experts on this subject based on the ideXlab platform.

  • self assembled manganese sulfide nanostructures on graphene as an oxygen reduction Catalyst for anion exchange membrane fuel cells
    ChemElectroChem, 2017
    Co-Authors: Asokan Arunchander, Shaik Gouse Peera, Akhila Kumar Sahu
    Abstract:

    The development of active, inexpensive, and durable non-precious-Metal electroCatalysts to replace high-cost Pt-based Catalysts towards the commercialization of fuel cell technology is the focus in recent years. In this regard, we report a facile one-pot hydrothermal synthesis of self-assembled manganese sulfide on graphene layers (MnS/G), and is recognized as a non-precious-Metal Catalyst for the efficient oxygen reduction reaction (ORR) in an alkaline medium. The phase purity and surface morphologies are investigated by using X-ray diffraction and scanning electron microscopic techniques, respectively. Optimized MnS/G with 50 % Mn exhibited excellent ORR properties with onset and half-wave potentials of 0.83 and 0.71 V vs. RHE, respectively. While evaluating the durability, only a 90 mV negative shift in its half-wave potential is observed after 5000 repeated potential cycles, which is also ascertained for up to 48 h of operation at a constant potential by using a chronoamperometric technique with 28 % degradation in the current. The optimized material is utilized as a cathode Catalyst in fabricating membrane electrode assembly for performance evaluation in an anion exchange membrane fuel cell. A peak power density of 12 mW cm−2 is realized in H2−O2 feeds under ambient temperature and pressure; thus, it looks as an alternative non-precious-Metal Catalyst for fuel cell applications.

  • Self‐Assembled Manganese Sulfide Nanostructures on Graphene as an Oxygen Reduction Catalyst for Anion Exchange Membrane Fuel Cells
    ChemElectroChem, 2017
    Co-Authors: Asokan Arunchander, Gouse Peera, Akhila Kumar Sahu
    Abstract:

    The development of active, inexpensive, and durable non-precious-Metal electroCatalysts to replace high-cost Pt-based Catalysts towards the commercialization of fuel cell technology is the focus in recent years. In this regard, we report a facile one-pot hydrothermal synthesis of self-assembled manganese sulfide on graphene layers (MnS/G), and is recognized as a non-precious-Metal Catalyst for the efficient oxygen reduction reaction (ORR) in an alkaline medium. The phase purity and surface morphologies are investigated by using X-ray diffraction and scanning electron microscopic techniques, respectively. Optimized MnS/G with 50 % Mn exhibited excellent ORR properties with onset and half-wave potentials of 0.83 and 0.71 V vs. RHE, respectively. While evaluating the durability, only a 90 mV negative shift in its half-wave potential is observed after 5000 repeated potential cycles, which is also ascertained for up to 48 h of operation at a constant potential by using a chronoamperometric technique with 28 % degradation in the current. The optimized material is utilized as a cathode Catalyst in fabricating membrane electrode assembly for performance evaluation in an anion exchange membrane fuel cell. A peak power density of 12 mW cm−2 is realized in H2−O2 feeds under ambient temperature and pressure; thus, it looks as an alternative non-precious-Metal Catalyst for fuel cell applications.

  • mno nitrogen doped graphene as a durable non precious hybrid Catalyst for the oxygen reduction reaction in anion exchange membrane fuel cells
    RSC Advances, 2016
    Co-Authors: Asokan Arunchander, Gouse Peera, M Vivekanantha, Akhila Kumar Sahu
    Abstract:

    A promising non-precious Metal Catalyst containing manganese oxide and N-graphene is synthesized and is recognised as an efficient and durable electroCatalyst for the oxygen reduction reaction (ORR) in an alkaline medium. Hydrothermally synthesized Mn3O4 is incorporated into graphene mixed with melamine as a nitrogen source and annealed at a temperature between 700 °C and 1000 °C. The phase formation, purity and morphological behaviours of pre-formed Mn3O4 and MnO after annealing are systematically studied by X-ray diffraction (XRD), high resolution scanning electron microscopy (HR-SEM) and transmission electron microscopy (TEM). The MnO and N-doped graphene (MnO/NG) Catalyst enhances ORR activity compared to other combinations of hybrid Catalysts, such as Mn3O4/G and MnO/G, as observed from the linear sweep voltammograms. It is found that MnO/NG annealed at 900 °C demonstrates excellent ORR catalytic activity in O2 saturated 0.1 M aqueous KOH electrolyte with a dominant 4e− transfer process, as confirmed by both RDE and RRDE measurements. The stability and durability of this optimized Catalyst is ascertained by potential cycling between −0.8 and 0.2 V vs. Ag/AgCl up to 10 000 potential cycles; superior durability was found in comparison to the state-of-art Pt/C Catalyst. This MnO/NG-900 hybrid Catalyst is used as a cathode Catalyst, and we fabricate a membrane electrode assembly (MEA) to validate the Catalyst in an anion exchange membrane fuel cell (AEMFC). A peak power density of 13 mW cm−2 at 30 °C under ambient pressure is realized; thus, our Catalyst appears to be promising as an alternative non-precious Metal Catalyst for AEMFCs.

Kang Zhao - One of the best experts on this subject based on the ideXlab platform.

Asokan Arunchander - One of the best experts on this subject based on the ideXlab platform.

  • self assembled manganese sulfide nanostructures on graphene as an oxygen reduction Catalyst for anion exchange membrane fuel cells
    ChemElectroChem, 2017
    Co-Authors: Asokan Arunchander, Shaik Gouse Peera, Akhila Kumar Sahu
    Abstract:

    The development of active, inexpensive, and durable non-precious-Metal electroCatalysts to replace high-cost Pt-based Catalysts towards the commercialization of fuel cell technology is the focus in recent years. In this regard, we report a facile one-pot hydrothermal synthesis of self-assembled manganese sulfide on graphene layers (MnS/G), and is recognized as a non-precious-Metal Catalyst for the efficient oxygen reduction reaction (ORR) in an alkaline medium. The phase purity and surface morphologies are investigated by using X-ray diffraction and scanning electron microscopic techniques, respectively. Optimized MnS/G with 50 % Mn exhibited excellent ORR properties with onset and half-wave potentials of 0.83 and 0.71 V vs. RHE, respectively. While evaluating the durability, only a 90 mV negative shift in its half-wave potential is observed after 5000 repeated potential cycles, which is also ascertained for up to 48 h of operation at a constant potential by using a chronoamperometric technique with 28 % degradation in the current. The optimized material is utilized as a cathode Catalyst in fabricating membrane electrode assembly for performance evaluation in an anion exchange membrane fuel cell. A peak power density of 12 mW cm−2 is realized in H2−O2 feeds under ambient temperature and pressure; thus, it looks as an alternative non-precious-Metal Catalyst for fuel cell applications.

  • Self‐Assembled Manganese Sulfide Nanostructures on Graphene as an Oxygen Reduction Catalyst for Anion Exchange Membrane Fuel Cells
    ChemElectroChem, 2017
    Co-Authors: Asokan Arunchander, Gouse Peera, Akhila Kumar Sahu
    Abstract:

    The development of active, inexpensive, and durable non-precious-Metal electroCatalysts to replace high-cost Pt-based Catalysts towards the commercialization of fuel cell technology is the focus in recent years. In this regard, we report a facile one-pot hydrothermal synthesis of self-assembled manganese sulfide on graphene layers (MnS/G), and is recognized as a non-precious-Metal Catalyst for the efficient oxygen reduction reaction (ORR) in an alkaline medium. The phase purity and surface morphologies are investigated by using X-ray diffraction and scanning electron microscopic techniques, respectively. Optimized MnS/G with 50 % Mn exhibited excellent ORR properties with onset and half-wave potentials of 0.83 and 0.71 V vs. RHE, respectively. While evaluating the durability, only a 90 mV negative shift in its half-wave potential is observed after 5000 repeated potential cycles, which is also ascertained for up to 48 h of operation at a constant potential by using a chronoamperometric technique with 28 % degradation in the current. The optimized material is utilized as a cathode Catalyst in fabricating membrane electrode assembly for performance evaluation in an anion exchange membrane fuel cell. A peak power density of 12 mW cm−2 is realized in H2−O2 feeds under ambient temperature and pressure; thus, it looks as an alternative non-precious-Metal Catalyst for fuel cell applications.

  • mno nitrogen doped graphene as a durable non precious hybrid Catalyst for the oxygen reduction reaction in anion exchange membrane fuel cells
    RSC Advances, 2016
    Co-Authors: Asokan Arunchander, Gouse Peera, M Vivekanantha, Akhila Kumar Sahu
    Abstract:

    A promising non-precious Metal Catalyst containing manganese oxide and N-graphene is synthesized and is recognised as an efficient and durable electroCatalyst for the oxygen reduction reaction (ORR) in an alkaline medium. Hydrothermally synthesized Mn3O4 is incorporated into graphene mixed with melamine as a nitrogen source and annealed at a temperature between 700 °C and 1000 °C. The phase formation, purity and morphological behaviours of pre-formed Mn3O4 and MnO after annealing are systematically studied by X-ray diffraction (XRD), high resolution scanning electron microscopy (HR-SEM) and transmission electron microscopy (TEM). The MnO and N-doped graphene (MnO/NG) Catalyst enhances ORR activity compared to other combinations of hybrid Catalysts, such as Mn3O4/G and MnO/G, as observed from the linear sweep voltammograms. It is found that MnO/NG annealed at 900 °C demonstrates excellent ORR catalytic activity in O2 saturated 0.1 M aqueous KOH electrolyte with a dominant 4e− transfer process, as confirmed by both RDE and RRDE measurements. The stability and durability of this optimized Catalyst is ascertained by potential cycling between −0.8 and 0.2 V vs. Ag/AgCl up to 10 000 potential cycles; superior durability was found in comparison to the state-of-art Pt/C Catalyst. This MnO/NG-900 hybrid Catalyst is used as a cathode Catalyst, and we fabricate a membrane electrode assembly (MEA) to validate the Catalyst in an anion exchange membrane fuel cell (AEMFC). A peak power density of 13 mW cm−2 at 30 °C under ambient pressure is realized; thus, our Catalyst appears to be promising as an alternative non-precious Metal Catalyst for AEMFCs.

Xiang Zhang - One of the best experts on this subject based on the ideXlab platform.

Yong Zhang - One of the best experts on this subject based on the ideXlab platform.