Effect of citrate anion incorporation on dielectric properties of anodic oxide grown on Ti-Si alloy

IF 2.6 4区化学 Q3 ELECTROCHEMISTRY

Journal of Solid State Electrochemistry Pub Date : 2024-09-20 DOI:10.1007/s10008-024-06087-y

Giada Tranchida, Andrea Zaffora, Francesco Di Franco, Monica Santamaria

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引用次数: 0

Abstract

Anodic oxides were galvanostatically grown on sputtered Ti-12at%Si alloy at 5 mA cm⁻² up to 50 V in phosphoric acid and sodium citrate aqueous electrolytes in order to investigate the effect of anions incorporation (if any) on dielectric properties of the grown oxides. Photoelectrochemical measurements supported the occurrence of incorporation of citrate anions when anodizing is carried out in a citrate-containing solution. Indeed, two different absorption thresholds were estimated due to energy transitions involving localized states in the mobility gap. Differential capacitance measurements showed higher capacitance values for anodic oxide grown in the citrate-containing solution, with a beneficial effect on the dielectric constant. The increased capacitance can be explained considering the synergistic effect of a more favourable anodizing ratio provided by the presence of Si cations from the bare alloy as well as the incorporation of foreign species due to the inward migration of citrate anions from the electrolyte during the anodizing process.

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柠檬酸盐阴离子掺入对钛硅合金阳极氧化物介电性能的影响

在磷酸和柠檬酸钠水溶液中，在5 mA cm−2至50 V的电压下，在溅射Ti-12at%Si合金上恒流生长阳极氧化物，以研究阴离子掺入（如果有的话）对生长的氧化物介电性能的影响。在含柠檬酸盐的溶液中进行阳极氧化时，光电化学测量支持柠檬酸阴离子掺入的发生。实际上，由于迁移率间隙中涉及局域态的能量跃迁，估计了两个不同的吸收阈值。差分电容测量表明，在含柠檬酸盐溶液中生长的阳极氧化物的电容值较高，这对介电常数有有益的影响。电容的增加可以解释为，在阳极氧化过程中，由于来自裸合金的硅离子的存在，以及由于电解质中柠檬酸阴离子的向内迁移，外来物质的掺入，提供了更有利的阳极氧化比的协同效应。

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来源期刊

Journal of Solid State Electrochemistry 工程技术-电化学

CiteScore

4.80

自引率

4.00%

发文量

227

审稿时长

4.1 months

期刊介绍： The Journal of Solid State Electrochemistry is devoted to all aspects of solid-state chemistry and solid-state physics in electrochemistry. The Journal of Solid State Electrochemistry publishes papers on all aspects of electrochemistry of solid compounds, including experimental and theoretical, basic and applied work. It equally publishes papers on the thermodynamics and kinetics of electrochemical reactions if at least one actively participating phase is solid. Also of interest are articles on the transport of ions and electrons in solids whenever these processes are relevant to electrochemical reactions and on the use of solid-state electrochemical reactions in the analysis of solids and their surfaces. The journal covers solid-state electrochemistry and focusses on the following fields: mechanisms of solid-state electrochemical reactions, semiconductor electrochemistry, electrochemical batteries, accumulators and fuel cells, electrochemical mineral leaching, galvanic metal plating, electrochemical potential memory devices, solid-state electrochemical sensors, ion and electron transport in solid materials and polymers, electrocatalysis, photoelectrochemistry, corrosion of solid materials, solid-state electroanalysis, electrochemical machining of materials, electrochromism and electrochromic devices, new electrochemical solid-state synthesis. The Journal of Solid State Electrochemistry makes the professional in research and industry aware of this swift progress and its importance for future developments and success in the above-mentioned fields.