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The electrochemical behaviour of pure aluminium in citric acid solution was investigated with a rotating disk electrode (RDE) at the open circuit potential (OCP), in the presence and in the absence of chloride, using electrochemical impedance spectroscopy and Raman spectroscopy. The impedance diagrams are composed of four frequency domains: at very high frequency (VHF), a Warburg-like behaviour was...
The aim of this paper is to characterise the compounds formed by the ageing of α NI(OH) 2 in 5 M KOH at 70°C. The final product of this treatment is known as the β Ni(OH) 2 phase, but with the ageing period, a progressive change of electrochemical reactivity as well as a textural and structural evolution are observed. The products obtained are stable in time once the ageing is stopped...
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