The investigation of Ru alloying on the electrochemical behaviour of pure Ti
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摘要: 研究了不同Ru含量合金化对纯Ti微观组织结构和电化学行为的影响，以改善钛双极板在质子交换膜水电解环境中的耐蚀性和电导率。结果表明，随着Ru含量的增加， α-Ti 等轴晶细化，耐蚀性提高。韦伯阻抗出现在开路电位下阻抗谱的低频区域。当Ru含量低于0.08%时，0.8 V vs Ref极化6 h的钝化膜表现出p型半导体行为，电导率保持恒定。Abstract: The effect of pure Ti alloyed with different Ru content on the microstructure and electrochemical behaviour was studied for the need of further improvement in corrosion resistance and conductivity of titanium bipolar plates in proton exchange membrane water electrolysis environments. Results indicated that the α-Ti equiaxed grains were refined, the corrosion resistance was improved with the increase of Ru content. The Warburg impedance appeared in the low frequency region of impedance spectroscopy obtained at OCP. When the Ru content is below 0.08%, the passivation film formed by polarizing at 0.8 V vs Ref for 6 h exhibits p-type semiconductor behavior, and the conductivity remains constant.
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Key words:
- Bipolar plates /
- titanium /
- ruthenium /
- microstructure /
- corrosion resistance
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图 1 不同含量的Ru合金化纯Ti的金相组织
Figure 1. The OM microstructure of Ti alloyed with different Ru contents
(a) 0；(b) 0.02%；(c) 0.04%；(d) 0.08%
图 2 不同含量的Ru合金化纯Ti的开路电位和动电位极化曲线
(a)开路电位；(b)动电位极化曲线
Figure 2. The curves of open circuit potential and potentiodynamic polarization of Ti alloyed with different Ru contents
图 3 不同含量的Ru合金化纯Ti的能斯特图和波特图
(a)能斯特图；(b)波特图
Figure 3. EIS curves of Ti alloyed with different Ru contents at OCP
图 5 相对于参比电极0.8 V下，不同含量的Ru合金化纯Ti的能斯特图和波特图
(a)能斯特图；(b)波特图
Figure 5. EIS curves of Ti alloyed with different Ru contents at 0.8 V vs Ref
图 7 相对于参比电极0.8 V下，不同含量的Ru合金化纯Ti的莫特-肖特基图
Figure 7. Mott-Schottky plots of the passive films formed on Ti alloyed with different Ru contents at 0.8 V vs Ref
表 1 不同含量的Ru合金化纯Ti的Ecorr和Icorr
Table 1. The Ecorr and Icorr of Ti alloyed with different Ru contents
试样 Ecorr/V Icorr×105/(A·cm−2) Ti −0.646 5.14 Ti−0.02Ru −0.557 3.97 Ti−0.04Ru −0.518 2.86 Ti−0.08Ru −0.485 0.122 
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表 2 图3阻抗谱的等效电路参数
Table 2. Equivalent circuit parameters for impedance spectra in Fig. 3
试样 Rs /(Ω·cm2) Rct /(Ω·cm2) Qdl ×104/
(Ω−1·cm2·sn)ndl W× 103/
(Ω−1·cm2·s0.5)χ2 ×10−4 Ti 2.10 634.90 3.35 0.90 9.77 6.12 Ti-0.02Ru 5.15 695.50 2.89 0.92 11.62 5.45 Ti-0.04Ru 2.76 740.50 3.90 0.89 13.4 12.7 Ti-0.08Ru 3.77 793.00 5.01 0.93 14.8 5.21
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表 3 图5阻抗谱的等效电路参数
Table 3. Equivalent circuit parameters for impedance spectra in Fig. 5
试样 Rs/
(Ω·cm2)Rct /
(Ω·cm2)Rc ×104 /
(Ω·cm2)Qdl ×104/
(Ω−1·cm2·sn)ndl Qc ×105/
(Ω−1·cm2·sn)nc χ2×10−4 Ti 2.97 74.32 9.13 4.52 0.96 6.66 0.93 11.15 Ti-0.02Ru 2.31 105.90 23.45 6.22 0.86 6.10 0.96 10.01 Ti-0.04Ru 2.32 48.92 46.66 11.32 0.94 6.02 0.94 3.96 Ti-0.08Ru 1.83 10.75 53.95 6.68 0.90 4.46 0.95 4.99
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