Electrochemical-reconstructed WC/WO2-WO3 heterostructure as a highly efficient hydrogen oxidation electrocatalyst

2021 ◽  
Author(s):  
Ge Meng ◽  
Heliang Yao ◽  
Han Tian ◽  
Fantao Kong ◽  
Xiangzhi Cui ◽  
...  
Keyword(s):  
Oxidation Reaction ◽  
Proton Exchange Membrane ◽  
Hydrogen Oxidation ◽  
Proton Exchange ◽  
Metal Catalyst ◽  
Co Poisoning ◽  
Noble Metal Catalyst ◽  
Hydrogen Oxidation Reaction ◽  
Highly Efficient ◽  
Exchange Membrane

Developing highly efficient and anti-CO poisoning non-noble metal catalyst towards hydrogen oxidation reaction (HOR) is of great significance for the wide application of proton exchange membrane fuel cells (PEMFCs). Herein,...

A Nickel‐Based Pectin Metal‐Organic Framework as a Hydrogen Oxidation Reaction Catalyst for Proton‐Exchange‐Membrane Fuel Cells

2019 ◽  
Vol 4 (16) ◽  
pp. 4731-4734 ◽  
Author(s):  
Marsil K. Kadirov ◽  
Salima T. Minzanova ◽  
Irek R. Nizameev ◽  
Mikhail N. Khrizanforov ◽  
Lyubov G. Mironova ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Oxidation Reaction ◽  
Proton Exchange Membrane ◽  
Hydrogen Oxidation ◽  
Metal Organic Framework ◽  
Proton Exchange ◽  
Hydrogen Oxidation Reaction ◽  
Metal Organic ◽  
Exchange Membrane ◽  
Organic Framework

scholarly journals Hydrogen Oxidation Artifact During Platinum Oxide Reduction in Cyclic Voltammetry Analysis of Low-Loaded PEMFC Electrodes

2020 ◽  
Vol 12 (1) ◽  
pp. 45-55
Author(s):  
S. Prass ◽  
J. St-Pierre ◽  
M. Klingele ◽  
K. A. Friedrich ◽  
N. Zamel
Keyword(s):  
Proton Exchange Membrane ◽  
Hydrogen Oxidation ◽  
Platinum Oxide ◽  
Proton Exchange ◽  
Cyclic Voltammograms ◽  
Reduction Peak ◽  
Oxidation Peak ◽  
Oxide Reduction ◽  
Hydrogen Oxidation Reaction ◽  
Exchange Membrane

AbstractAn artifact appearing during the cathodic transient of cyclic voltammograms (CVs) of low-loaded platinum on carbon (Pt/C) electrodes in proton exchange membrane fuel cells (PEMFCs) was examined. The artifact appears as an oxidation peak overlapping the reduction peak associated to the reduction of platinum oxide (PtOx). By varying the nitrogen (N2) purge in the working electrode (WE), gas pressures in working and counter electrode, upper potential limits and scan rates of the CVs, the artifact magnitude and potential window could be manipulated. From the results, the artifact is assigned to crossover hydrogen (H2X) accumulating in the WE, once the electrode is passivated towards hydrogen oxidation reaction (HOR) due to PtOx coverage. During the cathodic CV transient, PtOx is reduced and HOR spontaneously occurs with the accumulated H2X, resulting in the overlap of the PtOx reduction with the oxidation peak. This feature is expected to occur predominantly in CV analysis of low-loaded electrodes made of catalyst material, whose oxide is inactive towards HOR. Further, it is only measurable while the N2 purge of the WE is switched off during the CV measurement. For higher loaded electrodes, the artifact is not observed as the electrocatalysts are not fully inactivated towards HOR due to incomplete oxide coverage, and/or the currents associated with the oxide reduction are much larger than the spontaneous HOR of accumulated H2X. However, owing to the forecasted reduction in noble metal loadings of catalyst in PEMFCs, this artifact is expected to be observed more often in the future.

scholarly journals Radiolytic Preparation of Electrocatalysts with Pt-Co and Pt-Sn Nanoparticles for a Proton Exchange Membrane Fuel Cell

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Sang Kyum Kim ◽  
Ji Yun Park ◽  
Soon Choel Hwang ◽  
Do Kyun Lee ◽  
Sang Heon Lee ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Photoelectron Spectroscopy ◽  
Proton Exchange Membrane ◽  
Hydrogen Oxidation ◽  
Cell Polarization ◽  
Proton Exchange ◽  
Hydrogen Oxidation Reaction ◽  
X Ray ◽  
Radiation Induced ◽  
Exchange Membrane

Nanosized Pt-Sn/VC and Pt-Co/VC electrocatalysts were prepared by a one-step radiation-induced reduction (30 kGy) process using distilled water as the solvent and Vulcan XC72 as the supporting material. While the Pt-Co/VC electrodes were compared with Pt/VC (40 wt%, HiSpec 4000), in terms of their electrocatalytic activity towards the oxidation of H2, the Pt-Co/VC electrodes were evaluated in terms of their activity towards the hydrogen oxidation reaction (HOR) and compared with Pt/VC (40 wt%, HiSpec 4000), Pt-Co/VC, and Pt-Sn/VC in a single cell. Additionally, the prepared electrocatalyst samples (Pt-Co/VC and Pt-Sn/VC) were characterized by transmission electron microscopy (TEM), scanning electron microscope (SEM), thermogravimetric analysis (TGA), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), electrochemical surface area (ECSA), and fuel cell polarization performance.

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