4.5 Article

Carbon Dots Promote the Performance of Anodized Nickel Passivation Film on Ethanol Oxidation by Enhancing Oxidation of the Intermediate(dagger)

Journal

CHINESE JOURNAL OF CHEMISTRY
Volume 39, Issue 5, Pages 1199-1204

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/cjoc.20220000665

Keywords

Electrochemistry; Heterogeneous catalysis; Nickel; Ethanol oxidation reaction; Carbon dots

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In this study, a high efficient nickel-based catalyst for ethanol oxidation, Ni-APF/CDs, was shown to have low overpotential and high peak current density at a current density of 110 mA·cm(-2), reducing electrode thermal loss and increasing output energy. The carbon dots (CDs) in the system mainly function in increasing charge-transfer capacity and promoting the oxidation of carbonaceous intermediates.
Main observation and conclusion Ethanol is considered a better fuel than methanol in direct alcohol fuel cells because of the high energy density and low toxicity. Compared with noble metal catalysts, nickel-based catalysts are much cheaper in price. However, present nickel-based catalysts still surfer from some disadvantages such as low activity and high overpotential. In this paper, we show a new and high efficient nickel- based catalyst for ethanol oxidation. A layer of anodized nickel passivation film (Ni-APF) was formed on the surface of nickel sheet by anodic oxidation method with carbon dots (CDs) as co-catalyst. At the current density of 110 mA center dot cm(-2), the potential for Ni-APF/CDs was only 0.541 V (vs. Ag/AgCl), which was 18.8% lower than that of Ni-APF. Low overpotential could reduce electrode thermal loss and increase output energy. Ni-APF/CDs showed 144.4 mA center dot cm(-2) peak current density at peak potential 0.662 V (vs. Ag/AgCl), which was 31% higher than that of Ni-APF (110.3 mA center dot cm(-2)). In this system, CDs mainly function in the increase of charge-transfer capacity and the promotion oxidation of carbonaceous intermediates.

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