Abstract
The short service life of the Ti/BDD coated electrode is the main reason that limits its practical use. In this paper, the effect of structural change on the service life was studied using Ti/BDD coated electrodes prepared with the arc plasma chemical vapor deposition (CVD) method. It was found that the microstructural defects and corrosion resistance of BDD coatings were the main factors affecting the electrode service life. By optimizing the process parameters in different deposition stages, reducing the structural defects and improving the corrosion resistance of the BDD coating were conducted successfully, which increased the service life of the Ti/BDD coated electrodes significantly. The lifetime of the Ti/BDD samples increased from 360 h to 655 h under the electrolysis condition with a current density of 0.5 A/cm2, with an increase of 82%.
Highlights
As an excellent anode electrode material, the boron-doped diamond (BDD) electrode has been extensively studied and reported in the literature on its application in the wastewater treatment industry [1,2]
It is generally believed that corrosion of the TiC layer at the interface of the substrate/coating, quality and adhesion of the BDD coating, high residual stress produced in the chemical vapor deposition process, and the corrosion of the diamond phase under high potential are the possible causes of electrode failure [11,13,14,15]
The accelerated life tests (ALT) Results of Ti/BDD Coated Electrodes Prepared by Two Processes
Summary
As an excellent anode electrode material, the boron-doped diamond (BDD) electrode has been extensively studied and reported in the literature on its application in the wastewater treatment industry [1,2]. It is generally believed that corrosion of the TiC layer at the interface of the substrate/coating, quality and adhesion of the BDD coating, high residual stress produced in the chemical vapor deposition process, and the corrosion of the diamond phase under high potential are the possible causes of electrode failure [11,13,14,15]. To improve the service life of Ti/BDD coated electrodes, some attempts have been carried out by different researchers in terms of modifying the interface structure of the coating/substrate. Xue et al [11,15] improved the service life of a Ti/BDD electrode significantly by adding CH2 (OCH3 ) to the reaction atmosphere of CH4 and H2 , and believed that the increase of diamond nucleate density and growth rate reduced the thickness of the TiC layer
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