Carbon-based catalyst supports for oxygen reduction in proton-exchange membrane fuel cells

Zaman, Shahid; Wang, Min; Liu, Haijun; Sun, Fengman; Yu, Yang; Shui, Jianglan; Chen, Ming; Wang, Haijiang

doi:10.1016/j.trechm.2022.07.007

Cited by 71 publications

(45 citation statements)

References 125 publications

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“…Electronic structure of the as-prepared IrO X catalysts is investigated by XPS measurement. Figure c presents the Ir 4f XPS spectra, showing two main components of Ir 4f 7/2 and Ir 4f 5/2 , attributed to oxidized iridium peaks of IrO X , except that the doublets for IrO X -RT located in the slightly higher binding energy. , The dominant bimodal (components at 63.2 and 66.2 eV) corresponds to Ir 4+ , while the weaker bimodal (7/2 and 5/2 spin–orbit components at 62.0 and 65.0 eV) corresponds to Ir 3+ . Meanwhile, there is no peak for iridium (Ir 0 ), which is in agreement with the XRD data (Table S2).…”

Section: Resultsmentioning

confidence: 99%

Improved Reversal Tolerant Properties of IrO_X as an Anode Electrocatalyst in Proton Exchange Membrane Fuel Cells

Liao

Zaman

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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Voltage reversal is a severe issue in proton exchange membrane fuel cells (PEMFCs), which can be overcome by adding oxygen evolution electrocatalysts (OER) based on iridium oxide (IrO X ) to the anode catalyst layer. However, the crystal structure and antireversal properties of such anode materials have been rarely investigated. Herein, we report amorphous IrO X and explore the transformation of crystal structure under heat treatment to examine their antireversal performance in PEMFCs. It is found that heat treatment results in larger catalyst particles which consequences lower OER activity; however, it shows better voltage reverse tolerance (132.2 min). These investigations demonstrate that a balance is crucial between activity and durability in antireversal properties for PEMFCs. Physical characterizations reveal that improved stability and reversal tolerance is attributed to crystallinity and preferred orientation of IrO X crystals as well as existence of amorphous and crystalline IrO X . This work proposes a attempt to use the mixed phase IrO X in the antireversal anode catalyst and highlights the role of corresponding particle size and durability characteristics for the long-term durability of PEMFCs.

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Section: Resultsmentioning

confidence: 99%

Improved Reversal Tolerant Properties of IrO_X as an Anode Electrocatalyst in Proton Exchange Membrane Fuel Cells

Liao

Zaman

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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“…It was found that the MNHA functional groups’ frequencies were modified after coordination with the transition metals. Moreover, when more than one coordination site was present in an organic ligand, a basic medium was preferred for the formation of its respective metal complex [ 40 , 41 , 42 ]. The results of % analysis confirmed that there were no carbon-, hydrogen-, nitrogen-, and oxygen-containing compounds outside the coordination sphere as counter ions.…”

Section: Resultsmentioning

confidence: 99%

A New MBH Adduct as an Efficient Ligand in the Synthesis of Metallodrugs: Characterization, Geometrical Optimization, XRD, Biological Activities, and Molecular Docking Studies

et al. 2022

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This article reports the synthesis, characterization, geometrical optimization, and biological studies of new MBH-based organometallic compounds of medicinal significance. The ligand (MNHA) was prepared via the Morita–Baylis–Hillman (MBH) synthetic route, from aromatic aldehyde containing multiple functional groups. Metal complexes were prepared in an alkaline medium and under other suitable reaction conditions. Spectral and elemental analyses were used to identify the structural and molecular formulas of each compound. Optimized geometry was determined through density functional theory (DFT) B3LYP and 6-311++ G (d,p) basis set for the MBH adduct, whereas structures of novel complexes were optimized with the semi-empirical PM6 method. Powder XRD analysis furnished the crystal class of complexes, with Co3+, Cr3+, and Mn2+ being cubic, while Ni2+ was hexagonal, and Cu2+ was orthorhombic. Moreover, the ligand, along with Ni2+ and Co3+ complexes, showed profound antibacterial action against S. aureus, E. coli, B. pumilis, and S. typhi. Additionally, all of the complexes were shown to persist in the positive antioxidant potential of the ligand. Contrarily, not a single metal complex conserved the antifungal potentials of the ligand.

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“…Rare-earth elements such as Nd, Pr, La, and Ce ( Hasannejad et al, 2008 ; Zaman et al, 2022b ) provide extraordinary resistance to localized corrosion by forming insoluble hydroxide/oxide layers. These elements are not considered hazardous due to their low toxicity.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical corrosion resistance of aluminum alloy 6101 with cerium-based coatings in an alkaline environment

et al. 2022

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Chromium-free materials as eco-friendly coatings with higher corrosion resistance are crucial in various industrial processes. Herein, we report the deposition of cerium-based conversion, a chromium-free, eco-friendly chemical conversion coating for aluminum alloy 6101, by the dip coating method. Immersion in cerium salt precursors assisted with hydrogen peroxide was performed for the deposition of cerium-based conversion coatings on aluminum alloy 6101 at different bathing temperatures. The electrochemical corrosion behavior was assessed in an alkaline solution of sodium hydroxide (pH 11), including mass loss measurements, free corrosion risk, polarization, and electrochemical impedance spectroscopy. X-ray diffraction and photoelectron spectroscopy analysis showed that the coatings were composed of Ce (III) and Ce (IV) oxides. Surface modifications and surface degradation of the coating and substrate after immersion in corrosive media were analyzed by scanning electron microscopy. Additionally, energy dispersive scanning analysis demonstrated the elemental composition before and after corrosion of the cerium salt conversion-based coating. The results demonstrated that selectively deposited cerium-based conversion coatings improved the corrosion resistance by up to 96% in a strong corrosive alkaline media.

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Carbon-based catalyst supports for oxygen reduction in proton-exchange membrane fuel cells

Cited by 71 publications

References 125 publications

Improved Reversal Tolerant Properties of IrO_X as an Anode Electrocatalyst in Proton Exchange Membrane Fuel Cells

Improved Reversal Tolerant Properties of IrO_X as an Anode Electrocatalyst in Proton Exchange Membrane Fuel Cells

A New MBH Adduct as an Efficient Ligand in the Synthesis of Metallodrugs: Characterization, Geometrical Optimization, XRD, Biological Activities, and Molecular Docking Studies

Electrochemical corrosion resistance of aluminum alloy 6101 with cerium-based coatings in an alkaline environment

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Carbon-based catalyst supports for oxygen reduction in proton-exchange membrane fuel cells

Cited by 71 publications

References 125 publications

Improved Reversal Tolerant Properties of IrOX as an Anode Electrocatalyst in Proton Exchange Membrane Fuel Cells

Improved Reversal Tolerant Properties of IrOX as an Anode Electrocatalyst in Proton Exchange Membrane Fuel Cells

A New MBH Adduct as an Efficient Ligand in the Synthesis of Metallodrugs: Characterization, Geometrical Optimization, XRD, Biological Activities, and Molecular Docking Studies

Electrochemical corrosion resistance of aluminum alloy 6101 with cerium-based coatings in an alkaline environment

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Product

Resources

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Improved Reversal Tolerant Properties of IrO_X as an Anode Electrocatalyst in Proton Exchange Membrane Fuel Cells

Improved Reversal Tolerant Properties of IrO_X as an Anode Electrocatalyst in Proton Exchange Membrane Fuel Cells