| 引用本文: | 吴青华,杨意,石文龙,赵野,罗瑶,缪楚宇,武莹,李宇春.离子液体中电沉积钴铬合金析氢性能研究[J].材料科学与工艺,2023,31(4):78-86.DOI:10.11951/j.issn.1005-0299.20220170. |
| WU Qinghua,YANG Yi,SHI Wenlong,ZHAO Ye,LUO Yao,MIAO Chuyu,WU Ying,LI Yuchun.Hydrogen evolution performance of electrodeposited Co-Cr alloy in ionic liquid[J].Materials Science and Technology,2023,31(4):78-86.DOI:10.11951/j.issn.1005-0299.20220170. |
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| 离子液体中电沉积钴铬合金析氢性能研究 |
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吴青华,杨意,石文龙,赵野,罗瑶,缪楚宇,武莹,李宇春
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(长沙理工大学 化学化工学院,长沙 410114)
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| 摘要: |
| 为了研究电沉积合金材料的析氢性能,本文在离子液体中通过脉冲电沉积法在碳钢上制备钴铬合金,研究了离子液体中电沉积不同的钴盐浓度对析氢过电位的影响,并与离子液体中电沉积的Co电极和Cr电极,水溶液中电沉积的Co-Cr合金电极进行了对比分析。利用三电极体系测试沉积电极在碱性环境下的电化学性能,采用线性极化法、方波电位法、交流阻抗法、恒电流电解法等电化学测试方法,并结合XRD、SEM、EDS进行了形貌、物相与元素分析。实验结果表明: 制备的Co-Cr合金是多晶的,其晶粒尺寸为12.3 nm；当电流密度为10和100 mA/cm2时,所对应的析氢过电位分别为-105和 -408 mV；当塔菲尔斜率为-0.228 V/dec时,析氢电阻为2.45 Ω,计算得到其微观表面积为647 cm2；合金中Cr的质量分数约为8.5%,Co的质量分数约78.5%。随着钴盐浓度的上升,电沉积的钴铬合金电极的析氢性能越来越好。在离子液体中,通过脉冲电沉积制备的Co-Cr合金电极具有出色的电化学析氢性能,析氢机理为析氢反应动力学中的Volmer-Heyrovsky反应机理,析氢性能远优于水溶液中电沉积的Co-Cr合金电极。 |
| 关键词: 离子液体 钴铬合金 正交实验 析氢性能 碱性环境 |
| DOI：10.11951/j.issn.1005-0299.20220170 |
| 分类号:O469 |
| 文献标识码:A |
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| Hydrogen evolution performance of electrodeposited Co-Cr alloy in ionic liquid |
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WU Qinghua, YANG Yi, SHI Wenlong, ZHAO Ye, LUO Yao, MIAO Chuyu, WU Ying, LI Yuchun
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(School of Chemistry and Chemical Engineering,Changsha University of Science and Technology,Changsha 410114,China)
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| Abstract: |
| In order to investigate the hydrogen evolution performance of electrodeposited alloy materials, Co-Cr alloy was prepared on carbon steel by pulse electrodeposition in ionic liquid. The influence of different cobalt salt concentrations in ionic liquid on hydrogen evolution overpotential was analyzed. The Co electrode and Cr electrode electrodeposited in ionic liquid and the Co-Cr alloy electrode electrodeposited in aqueous solution were compared. Three-electrode system was used to test the electrochemical performance of the deposited electrode in alkaline environment. Linear polarization method, square wave potential method, AC impedance method, constant current electrolysis method, and other electrochemical testing methods were adopted, and the morphology, phase, and elements were analyzed by XRD, SEM, and EDS. Results show that the prepared Co-Cr alloy was polycrystalline with a grain size of 12.3 nm. When the current density was 10 and 100 mA/cm2, the corresponding hydrogen evolution overpotential was -105 and -408 mV respectively. When the Tafel slope was -0.228 V/dec, the hydrogen evolution resistance was 2.45 Ω, and its microscopic surface area was calculated to be 647 cm2. The mass fraction of Cr and Co in the alloy was about 8.5% and 78.5% respectively. With the increase in cobalt salt concentration, the hydrogen evolution performance of electrodeposited Co-Cr alloy electrode was improved. The Co-Cr alloy electrode prepared by pulse electrodeposition in ionic liquid had excellent electrochemical hydrogen evolution performance, the hydrogen evolution mechanism was Volmer-Heyrovsky reaction mechanism in hydrogen evolution kinetics, and the hydrogen evolution performance was much better than that of the Co-Cr alloy electrode electrodeposited in aqueous solution. |
| Key words: ionic liquid cobalt-chromium alloy orthogonal experiment hydrogen evolution performance alkaline environment |
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