| 碱性溶液中硼氢化钠在铜阳极上的氧化行为 |
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| 引用本文： | 段东红,孙彦平.碱性溶液中硼氢化钠在铜阳极上的氧化行为[J].化工学报,2009,60(11):2862-2868. |
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| 作者姓名： | 段东红 孙彦平 |
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| 作者单位： | 太原理工大学洁净化工研究所 |
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| 基金项目： | 国家自然科学基金，高等学校博士学科点专项科研基金 |
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| 摘 要： | Polarization data of BH-4 oxidation on Cu anode in alkaline solution were measured at steady state by a self-made experimental cell. The experimental polarization curve showed three regions：the region at lower over-potential η（below 0.4 V approximately），the region at higher η（above 0.6 V approximately）and the transitional region at medium η. It was found that the limiting current density is caused by the limiting elemental step rather than the external mass transport. The apparent reaction order with respect to BH-4 changes from 0 to 1. The active energy is about 40 kJ·mol-1 in both regions with lower and higher η，and is higher than 40 kJ·mol-1 in the transitional region. With the experimental temperatures and NaOH concentration，the hydrogen production rates released by the electrode reaction were measured at ［BH-4］/［OH-］ratios of 1∶40，1∶20，1∶6. 7 and 1∶4，which is strongly dependent on the over-potential. The apparent number of released electron n by the reaction was calculated by using the measured amounts of hydrogen and coulomb. Higher value of n was obtained at lower ［BH-4］/［OH-］ratio，higher temperature as well as higher over-potential. Under the experimental conditions，the value of n varies from 0 to 7，while in the transitional region it is just in the range of 3 to 5. The experimental results indicate that the limiting current density or n value will increase by virtue of proper experimental conditions. However，to considerably increase the current density at lower over-potential requires a modified anode with higher activity.
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| 关 键 词： | 铜阳极 硼氢化物 氧化反应 极化曲线 反应动力学 |
| 收稿时间： | 2009-3-13 |
| 修稿时间： | 2009-7-20
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Kinetic performance of BH_4~- oxidation on Cu anode |
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| DUAN Donghong,SUN Yanping.Kinetic performance of BH_4~- oxidation on Cu anode[J].Journal of Chemical Industry and Engineering(China),2009,60(11):2862-2868. |
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| Authors: | DUAN Donghong SUN Yanping |
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| Abstract: | Polarization data of BH_4~- oxidation on Cu anode in alkaline solution were measured at steady state by a self-made experimental cell. The experimental polarization curve showed three regions: the region at lower over-potential η (below 0. 4 V approximately), the region at higher η (above 0. 6 V approximately) and the transitional region at medium η. It was found that the limiting current density is caused by the limiting elemental step rather than the external mass transport. The apparent reaction order with respect to BH_4~- changes from 0 to 1. The active energy is about 40 kJ·mol~(-1) in both regions with lower and higher η, and is higher than 40 kJ· mol~(-1) in the transitional region. With the experimental temperatures and NaOH concentration, the hydrogen production rates released by the electrode reaction were measured at BH_4~- ] /OH~-] ratios of 1: 40, 1: 20, 1: 6. 7 and 1:4, which is strongly dependent on the over-potential. The apparent number of released electron n by the reaction was calculated by using the measured amounts of hydrogen and coulomb. Higher value of n was obtained at lower BH_4~1 ] /OH~- ] ratio, higher temperature as well as higher over-potential. Under the experimental conditions, the value of n varies from 0 to 7, while in the transitional region it is just in the range of 3 to 5. The experimental results indicate that the limiting current density or n value will increase by virtue of proper experimental conditions. However, to considerably increase the current density at lower over-potential requires a modified anode with higher activity. |
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| Keywords: | Cu anode borohydride oxidation reaction polarization curve kinetics |
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