Tribochemical behavior of GaN in electro-fenton system base on bimetallic micro-electrolytic catalysts

Abstract

In the electro-Fenton system, prolonged operation of the electro-Fenton catalyst can lead to the accumulation of significant amounts of Fe3+, resulting in concentration polarization phenomena that inhibit the progression of the electro-Fenton reaction, thereby adversely affecting the chemical mechanical polishing of GaN. This study introduces non-ferrous metal ions (Mn2+/Cu+/Ce3+) into the conventional electro-Fenton system, which primarily utilizes Fe2+ as the catalytic ion. By leveraging the principles of galvanic cells and Fenton-like reactions, we accelerate the electron exchange among different metal ions, thus enhancing the instantaneous concentration rate of electro-Fenton catalytic ions and the oxidation rate of GaN. Through tribological experiments involving GaN, it is evident that bi-metallic micro-electrolytic catalysts achieve a higher catalytic oxidation efficiency compared to their monometallic counterparts. Notably, the combination of Fe2+ and Ce3+ exhibits the most pronounced synergistic effect. This provides valuable insights for the design of composite catalytic media within the electro-Fenton framework.