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首页> 外文期刊>RSC Advances >Cyclic voltammetry growth and characterization of Sn-Ag alloys of different nanomorphologies and compositions for efficient hydrogen evolution in alkaline solutions
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Cyclic voltammetry growth and characterization of Sn-Ag alloys of different nanomorphologies and compositions for efficient hydrogen evolution in alkaline solutions

机译：不同纳米形式的循环伏安法生长及Sn-Ag合金的表征及碱性溶液中有效氢化的组合物

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摘要

Electrodeposition of silver, tin and their alloys from different aqueous electrolytes suffer from various environmental issues and deposits are affected by H-2 evolution and metal oxide formation. In this work, these metals and their alloys are electrodeposited by cyclic voltammetry utilizing ionic liquids based on C5H14ClNO (choline chloride) that permits deposit properties control. Both Ag and Sn concentrations in the ionic liquid were varied from 0.01 to 0.15 mol L-1. Methionine effect on the reduction potential of Sn and Ag was studied. Different techniques were applied to explore the structures, morphologies, and electrochemical (EC) activities of the deposits. A single Ag3Sn phase with orthorhombic packed structure was observed for all alloys, whereas the preferred growth orientation was varied from (202) to (112) depending on Ag%. Also, the dislocation density is decreased by increasing Ag content. EDX spectra showed only Ag and Sn signals indicating the high purity of the Sn-Ag alloys. The deposit from Sn-rich liquid showed rougher and larger agglomerates at the surface than that formed from the Ag-rich liquids with or without methionine. The electrochemical activities of the deposits toward the H-2 evolution reaction (HER) were investigated through electrochemical polarization (ECP) measurements and EC impedance spectroscopies (EISs). The Sn-Ag alloys possess higher performance, as a catalyst for HER using alkaline solution, than Ag or Sn electrodes. The highest rate of HER was recorded for Sn-35% Ag and Sn-97% Ag deposits, which correlated strongly to the microstructure and surface morphology. The ECP results were confirmed by EIS investigations. The measured impedance values are close-fitting to a hypothetical model for the electrode/electrolyte interface.
机译：来自不同含水电解质的银，锡及其合金的电沉积患有各种环境问题，沉积物受H-2演化和金属氧化物形成的影响。在这项工作中，这些金属及其合金通过基于C5H14ClNO（胆碱）的离子液体来电沉积的循环伏安法，允许沉积性能控制。离子液体中的Ag和Sn浓度在0.01至0.15mol L-1中变化。研究了对Sn和Ag的降低电位的甲硫氨酸效应。应用了不同的技术来探索沉积物的结构，形态和电化学（EC）活性。对于所有合金，观察到具有正交填充结构的单个Ag3Sn相，而优选的生长取向根据Ag％而变化（202）至（112）。而且，通过增加Ag含量降低位错密度。 EDX光谱仅显示AG和SN信号，表示SN-AG合金的高纯度。富含Sn的液体的沉积物显示出较大的表面和较大的附聚物，比由具有或不含甲硫氨酸的Ag富含Ag的液体形成的表面。通过电化学偏振（ECP）测量和EC阻抗谱（EIS）研究沉积物对H-2演化反应（她）的电化学活性。 Sn-Ag合金具有较高的性能，作为使用碱性溶液的催化剂，而不是Ag或Sn电极。对SN-35％Ag和Sn-97％Ag沉积物的最高速率记录，其强烈地与微观结构和表面形态相关。 ECP结果通过EIS调查证实。测量的阻抗值对电极/电解质界面的假设模型紧密配合。

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  • 来源
    《RSC Advances》 |2019年第39期|共12页
  • 作者

    Shaban Mohamed; Kholidy Islam; Ahmed Ghada M.; Negem Mosaad; Abd El-Salam Hanafy M.;

  • 作者单位

    Beni Suef Univ Fac Sci Phys Dept Nanophoton &

    Applicat Lab Salah Salem St Bani Suwayf 62514 Egypt;

    Beni Suef Univ Fac Sci Phys Dept Nanophoton &

    Applicat Lab Salah Salem St Bani Suwayf 62514 Egypt;

    Fayoum Univ Chem Dept Fac Sci Al Fayyum 63514 Egypt;

    Fayoum Univ Chem Dept Fac Sci Al Fayyum 63514 Egypt;

    Beni Suef Univ Fac Sci Dept Chem Bani Suwayf 62514 Egypt;

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  • 正文语种 eng
  • 中图分类 化学;
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