One-step synthesis of the hydrophobic conical Co-Fe structures – the comparison of their active areas and electrocatalytic properties.
One-step synthesis of the hydrophobic conical Co-Fe structures – the comparison of their active areas and electrocatalytic properties.
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DOI：
10.1016/j.electacta.2022.140127
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发表时间：
2022-03
影响因子：
6.6
通讯作者：
K. Skibińska;Kamil Kornaus;Xuegeng Yang;D. Kutyła;M. Wojnicki;P. Żabiński
中科院分区：
文献类型：
--
作者：
K. Skibińska;Kamil Kornaus;Xuegeng Yang;D. Kutyła;M. Wojnicki;P. Żabiński
为了使传质最大化，需要增强催化剂的表面。然而，如果没有明确的活性表面测定方法，则无法准确比较不同条件下沉积的催化剂。在这项工作中，用含有氯化铵作为晶体改性剂的电解液合成了Co-Fe合金锥体。它控制沉积物生长的方向，从而形成活性表面积。此外，还研究了外加磁场方向对铁磁Co-Fe合金的影响。它显着影响层的形态和组成，从而影响样品在析氢反应 (HER) 中的催化活性。使用线性扫描伏安法 (LSV) 测量来测试 1M NaOH 电解质中的催化活性。使用两种不同的方法确定实际活性表面积的预期发展：Brunauer-Emmett-Teller (BET) 和亥姆霍兹双层电容 (DLC)。结果表明，基于这些方法无法找到样品表面倍增的具体值。所有圆锥形结构都是疏水性的。
Enhancement of the surface of the catalyst is desirable in the interest of mass transport maximizing. However, without a well-defined method of determination of its active surface, catalyst deposited with different conditions cannot be accurately compared. In this work, Co-Fe alloy cones were synthesized from the electrolyte containing ammonium chloride as a crystal modifier. It controls the direction of the deposit growth, and consequently, develops the active surface area. Moreover, the influence of the direction of the applied magnetic field on the ferromagnetic Co-Fe alloy was investigated. It affected noticeably the morphology and composition of layers and therefore, the catalytic activity of the samples in the Hydrogen Evolution Reaction (HER). Linear Sweep Voltammetry (LSV) measurements were used to test the catalytic activity in 1 M NaOH electrolyte. The expected development of the real active surface area was determined using two different methods: Brunauer-Emmett-Teller (BET) and Helmholtz Double-Layer Capacitance (DLC). Results show that no specific value of the sample surface multiplication can be found based on these methods. All conical structures were hydrophobic.