Non-noble metal composite cathodes for hydrogen evolution. Part I: The Ni–MoOx coatings electrodeposited from Watt’s type bath containing MoO3 powder particles
Non-noble metal composite cathodes for hydrogen evolution. Part I: The Ni–MoOx coatings electrodeposited from Watt’s type bath containing MoO3 powder particles
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DOI：
10.1016/j.ijhydene.2011.02.105
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发表时间：
2011-06
影响因子：
7.2
通讯作者：
N. Krstajić;L. Gajić-Krstajić;U. Lačnjevac;B. Jović;S. Mora;V. Jović
中科院分区：
文献类型：
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作者：
N. Krstajić;L. Gajić-Krstajić;U. Lačnjevac;B. Jović;S. Mora;V. Jović
在这项工作中，Ni-MoOx涂层已被制备和表征，鉴于其可能的应用，在碱性溶液中的析氢反应（HER）的电催化剂。本文介绍了在模拟工业阴极沉积条件下，从含有MoO_3粉末颗粒的瓦特型镀液中在镍网上沉积Ni-MoO_3涂层的过程。采用SEM、EDS和XRD等技术对涂层的形貌、成分和相组成进行了分析。在32wt. %的Ni-MoOx涂层中研究了其析氢极化特性。在90 ° C下用NaOH处理，并与商业De诺拉涂料（DN）记录的结果进行比较。结果表明，最好的Ni-MoOx涂层具有几乎相同的极化特性的商业之一。通过对沉积样品的横截面和XRD分析，证实了MoO3粉末颗粒没有被Ni存款所包藏，钼物种是由MoO3溶解形成的阴离子沉积而成，遵循诱导共沉积机理。提出了MoO3相沉积的反应机理。
In this work the Ni–MoOxcoatings have been prepared and characterized in view of their possible application as electrocatalysts for hydrogen evolution reaction (HER) in alkaline solution. The procedure of deposition of Ni–MoOxcoatings from the Watt’s type bath containing MoO3powder particles onto Ni mesh, under the conditions of simulated industrial deposition conditions for commercial cathodes, has been presented. The morphology of the obtained coatings was investigated by SEM, the composition by EDS and the phase composition by XRD techniques. The polarization characteristics for hydrogen evolution on the obtained Ni–MoOxcoatings were investigated in the 32 wt.% NaOH at 90 °C and compared with the one recorded for the commercial De Nora’s coating (DN). It was shown that the best Ni–MoOxcoating exhibits almost identical polarization characteristics as the commercial one. By the cross section and XRD analysis of deposited samples it was confirmed that MoO3powder particles were not occluded by the Ni deposit and that molybdenum species were deposited from the molybdate ions formed by dissolution of MoO3, following the mechanism of induced co-deposition. The reaction mechanism for MoO3phase deposition has also been proposed.