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研究论文

镍电极在KOH水溶液中析氧行为的研究

  • 曹晓燕
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  • 南开大学新能源材料化学研究所

收稿日期: 1998-11-28

  修回日期: 1998-11-28

  网络出版日期: 1998-11-28

Oxygen Evolution Behavour on Ni Electrode in KOH Solution

  • Cao Xiaoyan Yuan Huatang Zhou Zuoxiang  Zhang Yunshi
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  • (Inst. of New Energy Material Chem. Nankai Univ. Tianjin 300071

Received date: 1998-11-28

  Revised date: 1998-11-28

  Online published: 1998-11-28

摘要

用恒电流法测试在22~70℃之间电解30wt.%KOH水溶液时Ni阳极的稳态极化曲线以及该过程的交换电流密度i0,Tafel斜率b,传递系数β和不同电流密度下的析氧过电位随电解温度的变化关系结果发现:40℃是各参量随温度变化的一个突出变点,40℃以下,高过电位区的Tafel斜率达120mV以上,低过电位区的反应活化能Ea为79.88kJ/mol,而40℃以上时,上述两参数分别为60~70mV和55.32kJ/mol.另外两温度区间的(η/T)1及其随lgi的变化也有显著差别

本文引用格式

曹晓燕 . 镍电极在KOH水溶液中析氧行为的研究[J]. 电化学, 1998 , 4(4) : 428 -433 . DOI: 10.61558/2993-074X.2711

Abstract

The steady_state polarization curves of oxygen evolution were measured at temperatures between 22~70 ℃ on Ni electrode in 30 wt.% KOH solution by galvanostat methode. The exchange current densities, Tafel slopes and transfer coefficients were studied. It was found that 40 ℃ is a special temperature, near which the kinetic parameters change abrupdy. The Tafel slopes for oxygen evolution reactions at higher overpotentials change from more than 120 mV to about 70 mV when the temperature raises to 40~70 ℃ from 22~35 ℃. Simultaneously, the heat of activation is changes from 79.88 kJ/mol to 55.32 kJ/mol. Moreover, the -(η/Τ) i and how it changes with lg i are quite different in the two temperature ranges: The slope of -(η/Τ) i vs. lg i is 4.63 at the lower temperatures, while at the higher temperatures it is only -0.455.

参考文献

1BalejJ.Determinationoftheoxygenandhydrogenovervoltageinconcentratedalkalihydroixdesolutions.Int.J.HydrogenEnergy,1985,10(6):3652BronoelG,RebyJ.Mechanismofoxygenevolutioninbasicmediumatanickelelectrode.ElectrochimicaActa,1980,25:9733MiaoHJ,PironDL.Electrodepositionofcatalyticalyactivenickelforoxygenevolutionreactionefectsofanodiccomposition.TheCan.J.Chem.Eng.,1993,71:5644TuPWT,SrinivasanS.ElectrochemicalElipsometricstudiesofoxidefilmformedonnickelduringoxygenevolution.J.Electrochem.Soc.,1978,125(9):14165翟大程,王建平等.镍在碱溶液中阳极氧化膜的拉曼光谱.复旦大学学报,1994,33(6):6856MeyerRE.Cathodicprocesesonpasivezirconium.J.Electrochem.Soc.,1960,107:8477MilesMH,KiselSetal.Efectoftemperatureonelectrodekineticparametersforhydrogenandoxygenevolutionreactionsonnickelelectrodesinalkalinesolutions.J.Electrochem.Soc.,1976,123(3):332
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