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To better platinum's (Pt's) electro-catalytic activity for oxidizing methanol, nano-flowers structured Pt catalysts with controlled facet had been planted onto titanium dioxide nanotube array (TNA) bed via a pulse electrodeposting method in an add electrolyte containing chloroplatinic acid (H2PtCl6). The facet of Pt nano-flowers can be tuned as (111) or (100) by adding sulfuric add (H2SO4) or hydrochloric acid (HQ) respectively into the precursor. It has been discovered that the nano-flower structured Pt catalysts with (111) facet generates a current density peak of 243.16 rnA.mg(-1) (similar to 2 times that of Pt catalysts with (200) facets) for catalytic oxidizing methanol in electrolyte containing 1 M methanol and 0.5 M H2SO4. In addition, the concentration of sulfuric acid in electrolyte has an effect on electrode's morphology, its electro-catalytic capability and stability. The mechanism of sulfuric acid anion for bettering Pt's electro-catalytic activity had been comparatively investigated by replacing H2SO4 as HCl in precursor. (C) 2019 Elsevier B.V. All rights reserved.
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SUSTAINABLE MATERIALS AND TECHNOLOGIES
ISSN: 2214-9937
年份: 2019
卷: 20
9 . 6 0 0
JCR@2022
JCR分区:2