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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Beaded stream-like CoSe2 nanoneedle array for efficient hydrogen evolution electrocatalysis
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Beaded stream-like CoSe2 nanoneedle array for efficient hydrogen evolution electrocatalysis

机译：用于高效析氢电催化的串珠流状CoSe2纳米针阵列

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摘要

The development of earth-abundant and efficient electrocatalysts for the hydrogen evolution reaction (HER) is one of the keys to success for future green energy systems using hydrogen fuel. Nanostructuring of electrocatalysts is a promising way to enhance their electrocatalytic performance in the HER. In this study, pure pyrite-type beaded stream-like cobalt diselenide (CoSe2) nanoneedles are directly formed on flexible titanium foils through treating a cobalt oxide (Co3O4) nanoneedle array template with selenium vapor. The beaded stream-like CoSe2 nanoneedle electrode can drive the HER at a current density of 20 mA cm(-2) with a small overpotential of 125 mV. Moreover, the beaded stream-like CoSe2 nanoneedle electrode remains stable in an acidic electrolyte for 3000 cycles and continuously splits water over a period of 18 hours. The enhanced electrochemical activity is facilitated by the unique three-dimensional hierarchical structure, the highly accessible surface active sites, the improved charge transfer kinetics and the highly attractive force between water and the surface of the nanoneedles that exceeds the surface tension of water.
机译：开发用于析氢反应 （HER） 的地球丰富且高效的电催化剂是未来使用氢燃料的绿色能源系统成功的关键之一。电催化剂的纳米结构是提高其在HE中的电催化性能的一种有前途的方法。本研究通过用硒蒸气处理氧化钴（Co3O4）纳米针阵列模板，直接在柔性钛箔上形成纯黄铁矿型串珠状二硒化钴（CoSe2）纳米针。串珠状流状 CoSe2 纳米针电极可以以 20 mA cm（-2） 的电流密度驱动 HER，过电位为 125 mV。此外，串珠状流状 CoSe2 纳米针电极在酸性电解质中保持稳定 3000 次循环，并在 18 小时内连续分解水。独特的三维分层结构、高度可及的表面活性位点、改进的电荷转移动力学以及水与纳米针表面之间的高度吸引力（超过水的表面张力）促进了电化学活性的增强。

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