Cape Town, Province of the Western Cape, South Africa

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    ABSTRACT: The relative isolation of subsaharan Africa that has largely spared it the spread of most of the important honey bee pathogens and parasites seems to be a thing of the past. We report on the latest international honey bee parasite to be found in subequatorial Africa.
    No preview · Article · Apr 2015 · Bee World
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    ABSTRACT: This paper reports use of an ultrasonic-spray for producing low Pt loadings membrane electrode assemblies (MEAs) with the catalyst coated substrate (CCS) fabrication technique. The main MEA sub-components (catalyst, membrane and gas diffusion layer (GDL)) are supplied from commercial manufacturers. In this study, high temperature (HT) MEAs with phosphoric acid (PA)-doped poly(2,5-benzimidazole) (AB–PBI) membrane are fabricated and tested under 160 °C, hydrogen and air feed 100 and 250 cc min−1 and ambient pressure conditions. Four different Pt loadings (from 0.138 to 1.208 mg cm−2) are investigated in this study. The experiment data are determined by in-situ electrochemical methods such as polarization curve, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The high Pt loading MEA exhibits higher performance at high voltage operating conditions but lower performances at peak power due to the poor mass transfer. The Pt loading 0.350 mg cm−2 GDE performs the peak power density and peak cathode mass power to 0.339 W cm−2 and 0.967 W mgPt−1, respectively. This work presents impressive cathode mass power and high fuel cell performance for high temperature proton exchange membrane fuel cells (HT-PEMFCs) with low Pt loadings.
    No preview · Article · Dec 2014 · Journal of Power Sources
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    ABSTRACT: In this work, membrane electrode assemblies (MEAs) prepared by catalyst coating membrane (CCM) method are investigated for reduced platinum (Pt) loading and improved Pt utilization of high temperature proton exchange membrane fuel cell (PEMFC) based on phosphoric acid (PA)-doped poly(2,5-benzimidazole) (AB-PBI) membrane. The results show that CCM method exhibits significantly higher cell performance and Pt-specific power density than that of MEAs prepared with conventional gas diffusion electrode (GDE) under a low Pt loading level. In-suit cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) show that the MEAs prepared by the CCM method have a higher electrochemical surface area (ECSA), low cell ohmic resistance and low charge transfer resistance as compared to those prepared with GDEs at the same Pt loading.
    Full-text · Article · Nov 2014 · Journal of Power Sources

Information

  • Address
    Robert Sobukwe Road, 7535, Cape Town, Province of the Western Cape, South Africa
  • Head of Institution
    Prof. Brian O'Connell
  • Website
    www.uwc.ac.za
  • Phone
    +27 21 959 2911
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Top publications last week by reads

 
The Lancet 07/2007; 369(9579):2121-31. DOI:10.1016/S0140-6736(07)60325-0
65 Reads
 
Journal of Management 04/2010; 36(5). DOI:10.1177/0149206309352246
54 Reads

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Collaborations

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Rg score distribution

See how the RG Scores of researchers from University of the Western Cape are distributed.