Khurram Shahzad, Cezarina Cela Mardare, Andrei Ionut Mardare, Achim Walter Hassel,
"Mixed oxide growth on combinatorial aluminium?gadolinium alloys ? a thermodynamic and first-principles approach"
, in Journal of Solid State Electrochemistry, Vol. 25, Nummer 10-11, Seite(n) 2479-2493, 2021, ISSN: 1432-8488
Original Titel:
Mixed oxide growth on combinatorial aluminium?gadolinium alloys ? a thermodynamic and first-principles approach
Sprache des Titels:
Englisch
Original Kurzfassung:
Metal surfaces covered with oxides have attracted considerable scientific attention in various applications. In particular, anodic films fabricated by cost-effective anodizing have been widely used in nano-structured engineering to provide various surface functionalities. However, understanding of alloy film stability, having individual elements with widely varying structures and morphologies, is very limited due to lack of thermodynamic information and effects of electrolyte chemistry. This requires many tedious efforts on a trial and error basis in selecting suitable electrolytes that can produce the protective film at high efficiency on alloys having mixed chemistries. It is, therefore, crucial to develop a combination of high throughput theoretical analysis and automated rapid localized electrochemical probing that provides a fast and simple solution for electrolyte choice and paves the way to the remarkable expansion of industrial applications of oxides. Herein, we demonstrate that combinatorial Al?Gd alloys covering 1.0 to 10.0 at.% Gd can be oxidized into ultra-thin anodic films of controlled thickness through a selection of electrolyte based on thermodynamics (phosphate buffer with a pH of 8.20). We propose that growth of anodic films on alloys at high efficiency is possible if Gibbs free energy minimization criteria would be systematically contemplate.