Chinese Journal of Applied Chemistry ›› 2015, Vol. 32 ›› Issue (10): 1177-1183.DOI: 10.11944/j.issn.1000-0518.2015.10.150087

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Electrocatalytic Oxidation of Ethanol Using Porous Nickel Prepared by Hydrogen Bubble Template

ZHANG Wenbinab*(),ZHANG Zhangcaia   

  1. aCollege of Chemistry and Bio-engineering,Yichun University
    bEngineering Center of Jiangxi University for Lithium Energy,Yichun,Jiangxi 336000,China
  • Received:2015-03-09 Accepted:2015-06-25 Published:2015-10-10 Online:2015-10-10
  • Contact: ZHANG Wenbin
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21303158), Science and Technology Foundation of Ministry of Education of Jiangxi Province(No.12701)

Abstract:

Porous nickel was electrodeposited by the reduction of nickel ions with the evolution of hydrogen bubble in aqueous solution. This material shows outstanding performance for electrocatalytic oxidation of ethanol in a strong base solution. Quasi-reversible proton coupled electron transfer reaction between β-Ni(OH)2and β-NiOOH is observed for porous nickel in 1 mol/L KOH solution. From the cyclic voltammograms, a linear relationship between peak current density and square root of potential scan rate is obtained. Based on this relationship, proton diffusion coefficient is calculated to be 2.92×10-8 cm2/s for porous nickel, which is four order of magnitude higher than that for bulk nickel due to the increased real surface area. Cyclic voltammetry and chronoamperometry have been used to characterize the electrocatalytic oxidation ability of porous nickel toward ethanol. In comparison to Ni(220), porous nickel gives a higher catalytic efficiency. The catalytic reaction rate constant is measured to be 7.17×103 cm3/(mol·s) by chronoamperometry.

Key words: hydrogen bubble template method, porous nickel, electrocatalytic oxidation, ethanol