| Popis: |
In this paper, the research status of photocathodic protection in broadening light absorption range, enhancing electron-hole separation rate and conduction efficiency of electrons, and realizing protection in the dark were discussed. Six modification methods were summarized, including modification of conductive polymers, construction of heterojunction, composition with two-dimensional conductive materials, adjustment and control of topography, doping with metal or non-metallic elements and coupling with energy storage semiconductors. The problems, such as short duration of protection in the dark and low repeatability of some experiments, were pointed out. The unsolved technical difficulties, such as overcoming insufficient natural light intensity, the harsh conditions of electrolyte solution and the complexity of photocathodic protection system design, were analyzed. Finally, several solutions to above problems were proposed, such as the development of semiconductor materials driven by natural light, the preparation of colloidal electrolyte and capsule material for storing electrolyte, and the design of photocathodic protection coatings. |
