Enhancement Technology Of BDD/Ti Electrode Performance

Boron-doped diamond has a broad application prospect in the severe organic wastewater treatment due to its superior physical and chemical stability, low background current and a very wide potential window. In this thesis, basic research was carried out on the preparation of high performance BDD/Ti electrode and its application, including the mesh electrode, the enchancement of adhesion and the nanostructured array electrode. The main work and the results obtained are as follows:1. BDD mesh electrode was successfully prepared in HFCVD system, Raman and SEM results show that the prepared mesh electrode was covered with high quality diamond film. The thermal stress of the mesh electrode was analysised by Ansys software. The results show that the mesh electrode mainly has the phenomenon of stress concentration in the abrupt structure. The wastewater treatment results show that the degradation efficiency of the mesh electrode has a 10.4% increment than that of the flat electrode.2. A designed two steps process for preparing high performance of BDD by changing the doped boron concentration was put forward. The prepared samples were characterized by Raman, SEM and EDS. The results show that the quality of the diamond is good and the thickness of the Ti C interlayer ang its residual stress has obvious change. The indentation comparison experiments prove the adhesion of the electrode prepared by the new method improves significantly; accelerated life tests show that the life of the electrode compared to the common electrode has a 26% increment.3. Nanostructured array BDD electrode has been prepared by electron cyclotron resonance plasma enhanced chemical vapor deposition(ECR-MPCVD) method. The electrochemical window, background current, reversibility and stability of the nanostructure electrode were mearsured by cyclic voltammetry method. Electrochemical reversibility analysis shows that the electro-active surface area of prepared nanostructured array electrode compared with ordinary flat electrode is increased by more than 50% and at the same time the reversibility and stability performance is good. Simulation of phenol wastewater treatment experiments show that the degradation efficiency of the nanostructured array electrode wastewater treatment has a 32% increment at most than the ordinary electrode; current efficiency is also improved 16.7%.