Fern-shaped bismuth dendrites electrodeposited at hydrogen evolution potentials

Fern-shaped bismuth dendrites electrodeposited at hydrogen evolution potentials
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在析氢电位下电沉积蕨形铋枝晶

DOI:
10.1039/c0jm03213a
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发表时间:
2011-02
期刊:
Journal of Materials Chemistry(IF:5.099)
影响因子:
--
通讯作者:
Minli Yang
Minli Yang
中科院分区:
其他
文献类型:
--
作者:
Minli Yang

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制备具有高孔隙率和高比表面积的纳米结构材料已经引起了科学界的广泛关注。在这里,我们描述了在没有任何添加剂和外来模板的情况下,在析氢过电位下直接电沉积蕨类形状的铋枝晶。采用预沉积步骤来调节和控制氢气泡的成核和生长。随后,在恒定过电位下同时进行Bi3+和H+离子的电化学还原。扫描电镜和透射电镜表征表明,所得微孔网状膜由蕨类单晶铋枝晶组成。讨论了其形成机制,并将其归因于氢泡的“停滞”模板效应,该效应限制了蕨类树突的横向生长。这种两步电沉积也可以扩展到其他具有高氢过电位的金属和合金的纳米结构制造中。
Easy fabrication of nanostructured materials with high porosity and high specific surface area has been drawing much scientific interest. Here, we describe a direct electrodeposition of fern-shaped bismuth dendrites at hydrogen evolution overpotentials without any additive and foreign template. A predeposition step was adopted to adjust and control the nucleation and growth of hydrogen bubbles. Subsequently, the simultaneous electrochemical reductions of Bi3+ and H+ ions were performed at a constant overpotential. Scanning electron microscopy and transmission electron microscopy characterizations showed that the resultant microporous netlike films consisted of fern-shaped single-crystal bismuth dendrites. The formation mechanism was discussed and ascribed to a “stagnant” template effect of hydrogen bubbles, which limited the lateral growth of fern-shaped dendrites. Such a two-step electrodeposition could also be extended to the nanostructure fabrication of other metals and alloys with high hydrogen overpotentials.
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