| LIU Yue-ren,XIN Yong-lei,XU Li-kun,DUAN Ti-gang,GAO Xian-ze,GUO Ming-shuai.Electrocatalytic Oxygen Evolution Performance of Nanostructured Ti/Co3O4/RuO2-IrO2 Anode[J],51(11):436-444, 461 |
| Electrocatalytic Oxygen Evolution Performance of Nanostructured Ti/Co3O4/RuO2-IrO2 Anode |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.11.041 |
| KeyWord:RuO2-IrO2 Co3O4 nanosheets electrocatalysis oxygen evolution metallic oxide anode voltammetric charge |
| Author | Institution |
| LIU Yue-ren |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute LSMRI, Shandong Qingdao , China |
| XIN Yong-lei |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute LSMRI, Shandong Qingdao , China |
| XU Li-kun |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute LSMRI, Shandong Qingdao , China |
| DUAN Ti-gang |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute LSMRI, Shandong Qingdao , China |
| GAO Xian-ze |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute LSMRI, Shandong Qingdao , China;College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 15001, China |
| GUO Ming-shuai |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute LSMRI, Shandong Qingdao , China;College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 15001, China |
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| Abstract: |
| In order to improve the electrocatalytic oxygen evolution performance of Ti/RuO2-IrO2 anode, Ti/Co3O4/RuO2- IrO2 composite anode with nano-structured Co3O4 interlayer was developed. The electrochemical oxygen evolution performance of the composite anode was studied. The TA0 titanium plate sample (100 mm×20 mm×10 mm) was degreased and cleaned, then boiled in 10wt.% oxalic acid aqueous solution for 2 hours to remove the surface oxide film. The coating was prepared by potentiostatic electrodeposition. Electrodeposition adopts standard three-electrode system, and the plating solution is 0.05 mol/L aqueous solution of Co(NO3)2. The electrodeposition parameters were:applied potential ‒1.0 V (vs. SCE), solution temperature was 25 ℃, and deposition time was 30 min. After the electrodeposition was completed, the coated samples were placed in a muffle furnace and sintered at 350 ℃ for 1 hour to obtain Co3O4 nanosheet structure (Ti/Co3O4). H2IrCl6.6H2O and RuCl3.xH2O were mixed and dissolved in n-butanol, and then stirred for 30 min to form a coating solution with a concentration of 0.3 mol/L (Ir∶Ru=1∶9). The solution was uniformly coated on the prepared Ti/Co3O4 sample, then the sample was placed in a constant temperature oven at 120 ℃ for 20 min, and finally calcined in a muffle furnace at 500 ℃ for 1 hour. The above process was repeated 1 to 5 times to obtain Ti/Co3O4/RuO2-IrO2 composite anodes with different RuO2-IrO2 loadings. Then，the micro morphology of the coating was observed by scanning electron microscope (JSM-6700F) and transmission electron microscope (TECNAI G2 F20 s-twin). The component is analyzed by the EDS spectrum of each selected point taken by an energy spectrometer. Analyze the phase composition of the coating by an X-ray diffractometer (D8 Advance). Finally, electrochemical analysis was performed using an electrochemical workstation (Parstat 2273), and the samples were subjected to potentiodynamic polarization tests, cyclic voltammetry tests and cyclic stability tests. The Ti/Co3O4/RuO2-IrO2 anode with nanostructured Co3O4 interlayer was successfully prepared on the surface of Ti substrate by electrodeposition and sintering. The results showed that the intensity of XRD diffraction peak of RuO2-IrO2 gradually increased with the increase of coating times on the surface of Co3O4 nanosheets. SEM showed that the RuO2-IrO2 mixed nanoparticles loaded on Co3O4 nanosheets increased gradually with the increment of coating times, and finally the Co3O4 interlayer was covered. TEM analysis showed that Co3O4 nanosheets were made up of nanoparticles and had a porous structure. The polarization curves showed that the oxygen evolution potential of the composite anode containing Co3O4 interlayer coated with three layers of RuO2-IrO2 was the lowest. When the current density was 10 mA/cm2, the oxygen evolution potential of the composite anode was 1.326 V (vs. SCE), lower than that of the Ti/RuO2-IrO2 anode without interlayer (1.413 V). Cyclic voltammetric measurement showed that Ti/Co3O4/RuO2-IrO2 anode had a high electrocatalytic active surface area with a voltammetric charge of 62.83 mC/cm2, which was 166% higher than that of Ti/ RuO2-IrO2 anode (23.65 mC/cm2). Stability test demonstrated that after 1 000 cycles of cyclic stability test, the loss rate of voltammetric charge of the composite anode was 35.94%, which was lower than that of the anode without interlayer (48.88%), and the electrochemical activity of the composite anode with interlayer after the stability test with cyclic polarization was still obviously better than that of Ti/RuO2-IrO2 anode before cyclic polarization test. The Co3O4 with nanosheet structure can improve the electronic conductivity and increase the specific surface area; after loading the uniformly dispersed RuO2-IrO2 nanoparticles, the electrochemically active surface area of the composite anode increases significantly. Therefore, the addition of the interlayer of Co3O4 nanosheets improves the electrocatalytic oxygen evolution performance and stability of the Ti/Co3O4/ RuO2-IrO2 anode. |
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