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Ni/LaNi5多孔復(fù)合電極的制備及其析氫電催化性能
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Preparation and Electrocatalytic Performance for Hydrogen Evolution Reaction of the Ni/LaNi5 Porous Composite Electrode
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    摘要:

    先電沉積Ni-Zn合金鍍層，然后用濃堿將鍍層中的鋅脫溶，得到多孔鎳，最后采用復(fù)合電沉積將LaNi5鑲嵌到多孔鎳表面，制備成Ni/LaNi5多孔復(fù)合電極。采用穩(wěn)態(tài)極化曲線和交流阻抗譜對(duì)電極的電催化析氫性能進(jìn)行了評(píng)價(jià)，并運(yùn)用恒電位間歇電解和長(zhǎng)時(shí)間電解，開路電位等研究了電極的電析氫穩(wěn)定性。結(jié)果表明：Ni/LaNi5多孔復(fù)合電極的析氫表觀交換電流密度分別是鎳和多孔鎳的172倍和26倍；多孔復(fù)合電極中的LaNi5具有穩(wěn)定電極的作用，該電極比多孔鎳具有更優(yōu)異的抗斷電性能。

    Abstract:

    At first, the Ni-Zn coating was electroplated, then, the coating was immersed in concentrated alkali solution to remove zinc and the porous nickel was obtained. Finally, the Ni/LaNi5 porous composite electrode was prepared on this porous nickel surface by means of the composite electro-deposition. The electro-catalytic properties for hydrogen evolution reaction of the electrode were evaluated by electrochemical steady-state polarization curve and electrochemical impendence spectroscopy (EIS). And the stability of the electrode was studied by open circuit potential and constant potential electrolysis technology for long time and discontinuity electrolysis. Results show that the apparent exchange current density of the porous composite electrode is 172 and 26 times as much as that of the nickel electrode and the porous nickel electrode, respectively. Because LaNi5 possesses the effect of electrode protection, the stability of the porous composite electrode is better than that of the porous nickel.

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張 藝,王森林,李彩彩. Ni/LaNi5多孔復(fù)合電極的制備及其析氫電催化性能[J].稀有金屬材料與工程,2012,41(3):457~461.[Zhang Yi, Wang Senlin, Li Caicai. Preparation and Electrocatalytic Performance for Hydrogen Evolution Reaction of the Ni/LaNi5 Porous Composite Electrode[J]. Rare Metal Materials and Engineering,2012,41(3):457~461.]
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  • 收稿日期:2011-03-29
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