Electrochemical top-down synthesis of C-supported Pt nano-particles with controllable shape and size: Mechanistic insights and application
Electrochemical top-down synthesis of C-supported Pt nano-particles with controllable shape and size: Mechanistic insights and application
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DOI：
10.1007/s12274-020-3281-z
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发表时间：
2020-12
期刊：
影响因子：
9.9
通讯作者：
Batyr Garlyyev;Sebastian Watzele;J. Fichtner;J. Michalička;A. Schökel;A. Senyshyn;A. Perego;Ding Pan;H. El-Sayed;J. Macák;P. Atanassov;I. Zenyuk;A. Bandarenka
中科院分区：
文献类型：
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作者：
Batyr Garlyyev;Sebastian Watzele;J. Fichtner;J. Michalička;A. Schökel;A. Senyshyn;A. Perego;Ding Pan;H. El-Sayed;J. Macák;P. Atanassov;I. Zenyuk;A. Bandarenka
在这项工作中，我们展示了一种简单的自上而下的电化学侵蚀方法的力量，以获得具有控制形状和尺寸（在~ 2到~ 10纳米范围内）的Pt纳米颗粒。通过对宏观大块铂结构（如圆盘或导线）施加交流电压，可以合成具有窄尺寸分布的碳负载纳米颗粒。在不使用任何表面活性剂的情况下，颗粒的大小和形状可以通过调整简单的参数来改变，例如施加的电位、频率和电解质成分。例如，应用频率较低的正弦交流电压会产生立方纳米粒子；而更高的频率则导致主要是球形纳米颗粒。另一方面，正弦信号的幅值影响颗粒的大小；施加的交流信号的振幅越低，得到的颗粒尺寸越小。用这种方法制备的Pt/C催化剂对氧还原反应的质量活性为0.76 A/mg，比田中公司最先进的商业Pt/C催化剂（0.42 A/mg）高约2倍。除此之外，我们还讨论了纳米颗粒形成途径的机理见解。
In this work, we demonstrate the power of a simple top-down electrochemical erosion approach to obtain Pt nanoparticle with controlled shapes and sizes (in the range from ∼ 2 to ∼ 10 nm). Carbon supported nanoparticles with narrow size distributions have been synthesized by applying an alternating voltage to macroscopic bulk platinum structures, such as disks or wires. Without using any surfactants, the size and shape of the particles can be changed by adjusting simple parameters such as the applied potential, frequency and electrolyte composition. For instance, application of a sinusoidal AC voltage with lower frequencies results in cubic nanoparticles; whereas higher frequencies lead to predominantly spherical nanoparticles. On the other hand, the amplitude of the sinusoidal signal was found to affect the particle size; the lower the amplitude of the applied AC signal, the smaller the resulting particle size. Pt/C catalysts prepared by this approach showed 0.76 A/mg mass activity towards the oxygen reduction reaction which is ∼ 2 times higher than the state-of-the-art commercial Pt/C catalyst (0.42 A/mg) from Tanaka. In addition to this, we discussed the mechanistic insights about the nanoparticle formation pathways.