CAJ | 학술논문

采用循环伏安、线性扫描、电化学阻抗和环境扫描电镜对比研究了Pb-Ag和Pb-Ag-Nd阳极的阳极膜和析氧反应.结果表明,合金元素Nd促进了Pb/PbOn/PbSO4(1≤n<2)膜层的生长.在高极化电位区间(高于1.20 V (vs Hg/Hg2SO4/饱和K2SO4溶液)), Nd有利于低价铅的化合物(PbOn, PbSO4)向α-PbO2和β-PbO2转变.此外,环境扫描电镜形貌和线性扫描分析证明Pb-Ag-Nd表面生成的阳极膜较Pb-Ag的阳极膜更厚且更致密.因此, Pb-Ag-Nd阳极表面的阳极膜可以给合金基底提供更好的保护.另一方面,电化学阻抗测试揭示了两种阳极的析氧反应均受中间产物的形成和吸附控制. Nd可以降低阳极膜/电解液界面处中间产物的吸附阻抗且增加中间产物的覆盖率,从而提高析氧反应活性.综上所述,合金元素Nd可提高Pb-Ag阳极的耐腐蚀性,降低阳极电位进而起到节能降耗的作用.
채용순배복안、선성소묘、전화학조항화배경소묘전경대비연구료Pb-Ag화Pb-Ag-Nd양겁적양겁막화석양반응.결과표명,합금원소Nd촉진료Pb/PbOn/PbSO4(1≤n<2)막층적생장.재고겁화전위구간(고우1.20 V (vs Hg/Hg2SO4/포화K2SO4용액)), Nd유리우저개연적화합물(PbOn, PbSO4)향α-PbO2화β-PbO2전변.차외,배경소묘전경형모화선성소묘분석증명Pb-Ag-Nd표면생성적양겁막교Pb-Ag적양겁막경후차경치밀.인차, Pb-Ag-Nd양겁표면적양겁막가이급합금기저제공경호적보호.령일방면,전화학조항측시게시료량충양겁적석양반응균수중간산물적형성화흡부공제. Nd가이강저양겁막/전해액계면처중간산물적흡부조항차증가중간산물적복개솔,종이제고석양반응활성.종상소술,합금원소Nd가제고Pb-Ag양겁적내부식성,강저양겁전위진이기도절능강모적작용.
Anodic layers and oxygen evolution reaction (OER) of Pb-Ag and Pb-Ag-Nd anodes were investigated by cyclic voltammetry, linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS), and environmental scanning electron microscopy (ESEM). Al oying with Nd promoted the formation of Pb/PbOn/PbSO4 (1≤n<2). Nd facilitated the transformation of PbOn and PbSO4 toα-PbO2 andβ-PbO2, at potential above 1.2 V vs Hg/Hg2SO4 (saturated K2SO4 solution). ESEM and LSV indicated that the anodic layer formed on the Pb-Ag-Nd anode was thicker and more compact than that formed on the Pb-Ag anode. Consequently, the anodic layer on the Pb-Ag-Nd anode could provide better protection for metal ic substrates. EIS indicated that the OER was determined by the formation and adsorption of intermediates. Nd enhanced the OER reactivity, because of a smal er adsorption resistance and larger coverage of intermediates at the anodic layer/electrolyte interface. In summary, al oying with Nd can enhance the corrosion resistance and reduce the energy consumption of Pb-Ag anode due to lower anodic potential.