Untitled

Mazhar, A. A.; Arab, S. T.; Noor, Ehteram A.

doi:10.1023/a:1012039804089

Cited by 62 publications

(24 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Aluminium of purity greater than 99.99 wt%, should be used as feedstock for the alloy because impurities such as copper, iron and silicon aggravate self-corrosion [37,55,69]. Such contaminants form cathodic sites of localised galvanic cells on the aluminium surface where hydrogen evolves because of their low overpotential for the hydrogen evolution reaction, see Table 1 [70,71].…”

Section: Aluminium Alloysmentioning

confidence: 99%

Developments in electrode materials and electrolytes for aluminium–air batteries

Egan¹,

León²,

Wood³

et al. 2013

Journal of Power Sources

396

191

View full text Add to dashboard Cite

h i g h l i g h t s< Discussion of the rationale to choose a suitable alloy for Aleair battery. < Effect of the properties and preparation route to enhance the oxidation of Al. < Effect of the inhibitors on the anode oxidation in the alkaline electrolyte. This review shows the influence of the materials, including: aluminium alloy, oxygen reduction catalyst and electrolyte type, in the battery performance. Two issues are considered: (a) the parasitic corrosion of aluminium at open-circuit potential and under discharge, due to the reduction of water on the anode and (b) the formation of a passive hydroxide layer on aluminium, which inhibits dissolution and shifts its potential to positive values. To overcome these two issues, super-pure (99.999 wt%) aluminium alloyed with traces of Mg, Sn, In and Ga are used to inhibit corrosion or to break down the passive hydroxide layer. Since high-purity aluminium alloys are expensive, an alternative approach is to add inhibitors or additives directly into the electrolyte. The effectiveness of binary and ternary alloys and the addition of different electrolyte additives are evaluated. Novel methods to overcome the self-corrosion problem include using anionic membranes and gel electrolytes or alternative solvents, such as alcohols or ionic liquids, to replace aqueous solutions. The air cathode is also considered and future opportunities and directions for the development of aluminiumeair cells are highlighted.

show abstract

Section: Aluminium Alloysmentioning

confidence: 99%

Developments in electrode materials and electrolytes for aluminium–air batteries

Egan¹,

León²,

Wood³

et al. 2013

Journal of Power Sources

396

191

View full text Add to dashboard Cite

show abstract

“…These results can be ascribed to the dissolution of the aluminum oxide film due to the pH increase, which contributes for the decrease in the oxide layer thickness. [30][31][32][33] A thinner oxide layer explains the high values of the anodic currents during the reverse potential scan for those aluminum surfaces exposed to alkaline media.…”

Section: Anodization Of Aluminum In Aqueous Solution Containing Tartrmentioning

confidence: 99%

Electrodeposition of polypyrrole films on aluminum from tartrate aqueous solution

Liu¹,

Oliveira²

2007

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

A síntese eletroquímica de filmes de polipirrol em superfícies de alumínio, em meio aquoso contendo ácido tartárico e pirrol, foi realizada através da técnica galvanostática e por voltametria cíclica. Um mecanismo que considera o crescimento de uma camada porosa de óxido de alumínio em paralelo com a eletrodeposição do filme de polipirrol foi proposto. Foi observado que quanto mais homogênea a distribuição dos poros na camada de óxido, menor a resistência oferecida para o crescimento dos filmes de polipirrol. Também foi observado que os filmes de polipirrol depositados por voltametria cíclica são menos uniformes do que aqueles formados galvanostaticamente. Filmes eletrodepositados galvanostaticamente a maiores densidades de corrente são mais propensos ao processo de superoxidação, como mostram os resultados de FTIR. Além disso, filmes de polipirrol depositados a 2,5 mA cm -2 apresentam um melhor desempenho na proteção de superfícies de alumínio contra corrosão.The electrochemical synthesis of polypyrrole films on aluminum surfaces from aqueous solutions containing tartaric acid and pyrrole was performed using cyclic voltammetry and galvanostatic techniques. A mechanism that considers a porous aluminum oxide layer growing in parallel with the polymeric film explains the polypyrrole electrodeposition on aluminum surfaces. The more homogeneous the distribution of pores on the aluminum oxide layer, the smaller is the resistance offered to the polypyrrole film growth. Polypyrrole films deposited by cyclic voltammetry are much less uniform than those galvanostatically formed. Polymeric films galvanostatically deposited at higher current densities were more susceptible to overoxidation processes than those films formed at lower current densities, as demonstrated by FTIR analyses. Furthermore, films formed at low current density perform better on protecting aluminum surfaces against corrosion.

show abstract

“…At higher In 3+ concentrations, for potentials more positive In addition to being alloyed with indium, Al also can be alloyed with silicon (Si). Mazhar et al [71] reported that the results of a study using a polarization technique indicated that Al alloys with higher Si contents yield more negative potential values, and upon increasing the acid concentration, the potential values were found to shift even more negative, to between -0.8 V and -1.0 V.…”

Section: Acidic Solutionsmentioning

confidence: 99%