Surface functionalization of electro-deposited nickel.
Surface functionalization of electro-deposited nickel.
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DOI：
10.1039/c1cp22203a
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发表时间：
2011-10
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通讯作者：
J. Sadler;Doug S. Szumski;A. Kierzkowska;Samantha R Catarelli;K. Stella;R. Nichols;M. Fonticelli;G. Benítez;B. Blum;R. Salvarezza;W. Schwarzacher
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作者：
J. Sadler;Doug S. Szumski;A. Kierzkowska;Samantha R Catarelli;K. Stella;R. Nichols;M. Fonticelli;G. Benítez;B. Blum;R. Salvarezza;W. Schwarzacher
演示了一种使用辛硫醇对无氧化物镍表面进行功能化的新原位电化学方法。初始吸附会形成多层分子膜，从而阻止析氢反应 (HER) 和周围氧气对 Ni 的再氧化。然而，过量的辛硫醇可以通过用乙醇冲洗来去除，留下单分子层，继续防止再氧化，但会导致 HER 的意外增强，并且在更长的成膜时间中具有更大的增强。使用红外光谱对 CH(2)、CH(3) 和硫醇盐基团进行光谱观察，证实了表面存在辛硫醇单层，同时 X 射线光电子能谱证明了硫醇层作为表面氧化屏障的有效性。电化学制备的辛硫醇膜比通过浸没在辛硫醇的乙醇溶液中形成的膜更有效地阻止Ni在空气中的氧化。
A new in situ electrochemical method of functionalizing an oxide-free Ni surface is demonstrated using octanethiol. Initial adsorption results in a multilayer molecular film, which blocks both the hydrogen evolution reaction (HER) and re-oxidation of the Ni by ambient oxygen. However, excess octanethiol can be removed by rinsing with ethanol, leaving behind a monolayer that continues to protect against re-oxidation but gives rise to an unexpected enhancement in the HER, with a greater enhancement for longer film formation times. The presence of an octanethiol monolayer on the surface was confirmed by spectroscopic observation of the CH(2), CH(3) and thiolate groups using infra red spectroscopy, while X-ray photo-electron spectroscopy demonstrated the effectiveness of the thiol layer as a barrier to surface oxidation. The electrochemically prepared octanethiol film impedes oxidation of the Ni in air more effectively than a film formed by immersion in a solution of octanethiol in ethanol.