Abstract
Finely-dispersed nickel particles are electrodeposited on high surface-area perovskite-type La 2- x Sr x NiO 4 (0 ≤ x ≤ 1) electrodes for possible use in a direct methanol fuel cell (DMFC). The study is conducted by cyclic voltammetry, chronoamperometry, impedance spectroscopy and anodic Tafel polarization techniques. The results show that the apparent electrocatalytic activities of the modified oxide electrodes are much higher than those of unmodified electrodes under similar experimental conditions; the observed activity is the greatest with the modified La 1.5Sr 0.5NiO 4 electrode. At 0.550 V (vs. Hg|HgO) in 1 M KOH + 1 M CH 3OH at 25 °C, the latter electrode delivers a current density of over 200 mA cm −2, whereas other electrodes of the series produce relatively low values (65–117 mA cm −2). To our knowledge, such high methanol oxidation current densities have not been reported on any other non-platinum electrode in alkaline solution. Further, the modified electrodes are not poisoned by methanol oxidation intermediates/products.
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