表面处理对碳纤维基β-PbO_2电极性能的影响

Effect of Surface Treatment on Performance of Electrode Material Based on Carbon Fiber Cloth

对碳纤维布进行表面处理,采用电沉积法制备碳纤维基β-PbO_2电极材料,并对碳纤维基β-PbO_2电极材料的导电性能、电化学性能和耐腐蚀性能进行研究。结果表明:通过表面处理,能够显著改善碳纤维的表面粗糙度和化学活性。热空气氧化温度为400℃时,碳纤维表面的化学活性最高;热空气氧化和液相氧化双重氧化发现,碳纤维表面的化学活性进一步提高,表面的沟槽和凹坑更为明显,经此表面处理条件后制备的碳纤维电极界面电阻率最低为6.19×10^(-5)Ω·m,导电性能和电化学性能最好,耐腐蚀性能最强,腐蚀速率仅为1.44×10^(-3)g·cm^(-2)·h^(-1),由此说明,不同表面处理条件能够极大地影响碳纤维电极材料界面结合性能,从而影响碳纤维基β-PbO_2电极材料的导电性能、电化学性能和耐腐蚀性能。

The carbon fiber cloth was treated by surface treatment, and then it was used as the elec-trode substrate. The electrode material based on carbon fibers was synthesized by a galvanostatic elec-trodeposition method. The interface resistivity, electrochemical property and corrosion resistance of the CF/β-PbO2 electrode were characterized by four-probe method and electrochemical workstation, respectively. The results show that the surface roughness and chemical activity of the carbon fibers can be significantly improved through surface treatment. The carbon fibers possess the best chemical activity on the surface at the hot-air oxidation temperature of 400 ℃. Joint hot-air and liquid-phase oxi-dations show that the chemical activity of the carbon fibers on the surface is further improved, the grooves and pits on the surface of the carbon fibers are more obvious, after this treatment, the inter-face resistivity of the CF/β-PbO2 electrode reaches the minimum value of 6. 19×10-5Ω · m, mean-while, the conductivity and the electrochemical property of the CF/β-PbO2 electrode reaches the best, and with the best corrosion resistance, the corrosion rate is only 1. 44×10-3g · cm-2 · h-1. Thus, the interface resistivity, electrochemical property and corrosion resistance of the CF/β-PbO2 electrode de-pend on the the interface structure of the CF/β-PbO2 electrode obtained under different surface treat-ments.