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【答案】应助回帖
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fengheng: 金币+20, 翻译EPI+1, ★★★很有帮助, 谢谢！辛苦了！ 2012-05-24 08:37:29
fengheng: 金币+80 2012-05-26 19:25:48
Mo6+, Ni2+, Cr3+, Gd3+ and Ti3+ and other metal ions electro-deposition does not take place. Fe3++Mo6+, Fe3++Cu2+, Fe2++Cu2+ and Fe3++Zn2+ in 30%KOH solutions Central can total deposition, Fe3++Ni2+ and Cu2++Cr3+ are not all sedimentary, Ni2+ or Cr3+ does not affect the total accumulation of cathodic hydrogen activity.
Ni in Fe3++Cu2+ of 200mA/cm2 in aqueous solution of cathodic polarization current density 30min, cathode current density of hydrogen evolution overpotential 200mA/cm2 at 20 ° c is approximately about 450mV 550mV, 85 ° c;Hydrogen over Ni containing Fe2 + + Cu2 + solution in the constant current cathodic polarization potential of approximately 540mV at 20 ° C , 85 ° C is about 440mV ; Ni containing Fe3 + + Mo6 + solution in the constant current cathodic polarization of overpotential is about 450mV at 20 ° C , 85 ° C is about 380mV ; hydrogen over Ni containing Fe3 + + and Zn2 + solution in the constant current cathodic polarization potential of approximately 420mV at 20 ° C.Ni in the containing of Fe3 + after of Ni2 + solution and containing of Fe3 + of Cr3 + solution in the constant current cathodic polarization hydrogen evolution over potential with Ni containing Fe3 + solution in the constant current cathode polarization is almost equal , 85 ℃ is about 450mV ; Ni containing of Cu2 + + of Cr3 + solution in the constant current cathodic polarization hydrogen evolution over potential with Ni containing of Cu2 + solution in the constant current cathodic polarization , the same 85 ℃ is about 500mV , that is, of Ni2 + and of Cr3 + and did not change the Ni cathode overpotential of Ni2 + and Cr3 + Ni hydrogen evolution activity .At 85 ° C , Ni deposition of these impurity ions of hydrogen evolution overpotential of 180mV high hydrogen evolution activity than the Ni- Mo , Ni - Fe -Zn cathode increases of about 300mV . Therefore , 30% KOH solution , the deposition of metal ions in the Ni surface will reduce the activity of hydrogen evolution and the current efficiency of the electrolysis of water in the cathode of the electrolysis of water , increase power consumption . |
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