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首页> 外文期刊>RSC Advances >Catalytic impact of alloyed Al on the corrosion behavior of Co50Ni23Ga26Al1.0 magnetic shape memory alloy and catalysis applications for efficient electrochemical H2 generation
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Catalytic impact of alloyed Al on the corrosion behavior of Co50Ni23Ga26Al1.0 magnetic shape memory alloy and catalysis applications for efficient electrochemical H2 generation

机译：合金化Al对Co 50 Ni 23 Ga 26 Al 1.0 磁性形状记忆合金腐蚀行为的催化作用催化H 2 的高效生成及催化应用

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The electrochemical and corrosion behaviour of Co50Ni23Ga27?xAlx (x = 0 and 1.0 wt%) magnetic shape memory alloys (MSMAs) was studied in 0.5 M NaCl solutions using various electrochemical techniques. Results showed remarkable activation of the tested MSMA toward pitting corrosion upon alloying it with Al. XPS examination confirmed the activation influence of alloyed Al. It proved that the presence of Al in the alloy's matrix weakens its passivity, as manifested by a lower amount of gallium oxides and Cl? adsorption in the aluminium containing MSMA sample. Alloyed Al also activated significantly the tested MSMA for the hydrogen evolution reaction (HER), as indicated by cathodic polarization, electrochemical impedance spectroscopy (EIS), and faradaic efficiency (FE) measurements. Such measurements were performed in 0.1 M KOH solutions and showed that the Co50Ni23Ga26Al1.0 alloy is much more active for the HER than Co, Ni, Co50Ni50, and Co50Ni23Ga27 electrodes. The catalytic impact of pitting corrosion, proved to be catalyzed by Al, on the HER activity of the CoNiGaAl alloy was also studied. The pitted Co50Ni23Ga26Al1.0 MSMA, the best catalyst here, exhibited high HER catalytic performance with an exchange current density (jo) of 0.2 mA cm?2 and FE 96%, and thus approached Pt/C (jo = 0.6 mA cm?2 and FE ～ 100%). Our best catalyst also showed good stability and durability after 3000 cycles of cathodic polarization between the corrosion potential (Ecorr) and ?1.0 V vs. RHE, and 24 h of electrolysis at a high cathodic current density of 100 mA cm?2. Microstructure changes made by Al, together with findings obtained from SEM/EDX mapping and XPS studies, were used to interpret its activation influence towards the HER.
机译：Co 50 Ni 23 Ga 27？的电化学和腐蚀行为x Al x （ x = 0和1.0 wt使用各种电化学技术在0.5 M NaCl溶液中研究了磁性形状记忆合金（MSMA）。结果表明，将测试的MSMA与Al合金化后，其对点蚀的活化作用显着。 XPS检查确认了合金化Al的活化影响。事实证明，合金基体中Al的存在会削弱其钝化性，这表现为含铝MSMA样品中较少的氧化镓和Cl ？ 吸附。如阴极极化，电化学阻抗谱（EIS）和法拉第效率（FE）测量所表明的，合金化的Al还显着活化了经测试的MSMA的氢释放反应（HER）。在0.1 M KOH溶液中进行此类测量，结果表明Co 50 Ni 23 Ga < sub> 26 Al 1.0 合金对HER的活性比Co，Ni，Co 50 Ni 50 和Co 50 Ni 23 Ga 27 电极。还证明了Al催化的点蚀腐蚀对CoNiGaAl合金的HER活性的催化作用。凹坑的Co 50 Ni 23 Ga 26 Al 1.0 MSMA，这里最好的催化剂，具有高HER催化性能和交换电流密度（ j o < / sub> ）0.2 mA cm ？2 和FE 96％，因此接近Pt / C（ j o = 0.6 mA cm ？2 和FE〜100％）。我们最好的催化剂在腐蚀电位（ E corr ）和±1.0 V vs。 RHE，并在100 mA cm ？2 的高阴极电流密度下电解24小时。 Al产生的微观结构变化，以及从SEM / EDX映射和XPS研究获得的结果，均被用来解释其对HER的激活影响。

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