CTAB对Pb-Ag阳极MnO2镀膜电化学性能的影响

Effect of CTAB on the electrochemical performance of MnO2 coatings deposited on Pb-Ag anode

  • 摘要: 本文以十六烷基三甲基溴化铵 (CTAB) 为添加剂,通过干预Pb-Ag阳极表面MnO2的电结晶过程,诱导生成具有良好耐蚀性和析氧活性的MnO2膜层。研究表明,锌电积体系中适量CTAB的引入可加速Mn2+ → Mn3+中间体的氧化,促进MnO2的电结晶生长并均匀包覆在Pb-Ag基体上,有效提升电极的催化析氧活性和耐腐蚀性能。在模拟长周期工业锌电积过程中,1 g·L-1 CTAB辅助镀膜下制得的Pb-Ag/MnO2阳极 (PAM-C1) 较之工业镀膜条件下制备的MnO2镀膜阳极 (IPAM),具有更优的析氧和耐蚀性能:500 A·m-2下,PAM-C1阳极的析氧电位 (2.09 V vs. RHE) 较IPAM (2.14 V vs. RHE) 低50 mV,且性能稳定;经15天电解,相较IPAM阳极,基于PAM-C1阳极的电锌体系中溶铅量由0.7 mg·L-1降低为0.6 mg·L-1。

     

    Abstract: This issue results in problems such as reduced zinc product quality. In this study, cetyltrimethyl ammonium bromide (CTAB) was utilized as an additive to induce the formation of a MnO2 film with excellent corrosion resistance and oxygen evolution activity by interfering with the electrocrystallization process of MnO2 on the Pb-Ag anode surface. The findings demonstrate that introducing appropriate CTAB into the zinc electrodeposition system can accelerate the oxidation of Mn2+ → Mn3+ intermediates, promote uniform electrocrystallization growth of MnO2 on the Pb-Ag substrate, effectively enhance catalytic oxygen evolution activity and corrosion resistance of the electrode. During long-term industrial zinc electrowinning simulation, it was observed that compared to industrially coated MnO2-coated anodes (IPAM), 1 g·L-1 CTAB-assisted prepared Pb-Ag/MnO2 anode (PAM-C1) exhibit superior oxygen evolution performance and corrosion resistance. At 500 A·m-2, the oxygen evolution potential (2.09 V vs RHE) on PAM-C1 is 50 mV lower than that on IPAM (2.14 V vs RHE), while maintaining stable performance. After 15 days of electrolysis, the lead concentration in the PAM-C1-based system decreases from 0.70 mg·L-1 to 0.61 mg·L-1 compared to IPAM-based system.

     

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