In the present work, sulfur-doped carbon nanotubes (SCNTs) have been prepared using chemical vapor deposition method and various cobalt-containing catalysts. In this line, simple and silica-supported cobalt nanoparticles (Co and Co/SiO 2 ) and 5 cobalt spinels (MCo 2 O 4 , M = Ni, Cu, Mn, Fe, Cr, and Mg) were used as the growth catalysts and four different temperatures (600, 650, 700, and 750 °C) were used to obtain the optimized condition for the preparation of SCNTs. Among the employed catalysts, Co/SiO 2 at 600 °C showed the higher abilities for the preparation of desired SCNTs. All products were characterized using FESEM, EDS, XRD, Raman, static contact angle, TGA, and DTA analyzes. The electrochemical behaviors of the two best products (SCNTs-Co/SiO 2 and SCNTs-Co) in hydrogen evolution reaction (HER) were examined, which confirmed the higher ability of SCNTs-Co/SiO 2 . This best product was decorated with 2, 5, and 10% of gold nanoparticles to examine the effect of gold decoration of the properties and electrochemical abilities of the product. All decorated products exposure the higher electrochemical potencies versus the simple SCNTs and among the decorated products, 10% Au-SCNT was the most appropriate product for this purpose with small differences with the other ones.

中文翻译：

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金装饰的硫掺杂碳纳米管作为析氢反应的电催化剂

在目前的工作中，已使用化学气相沉积法和各种含钴催化剂制备了掺硫碳纳米管 (SCNT)。在这条生产线中，简单的二氧化硅负载的钴纳米粒子（Co 和 Co/SiO 2 ）和 5 个钴尖晶石（MCo 2 O 4 ，M = Ni、Cu、Mn、Fe、Cr 和 Mg）用作生长催化剂并使用四种不同的温度（600、650、700 和 750 °C）来获得制备 SCNT 的优化条件。在所使用的催化剂中，Co/SiO 2 在 600 °C 下表现出更高的制备所需 SCNT 的能力。所有产品均使用 FESEM、EDS、XRD、拉曼、静态接触角、TGA 和 DTA 分析进行表征。研究了两种最佳产物（SCNTs-Co/SiO 2 和 SCNTs-Co）在析氢反应（HER）中的电化学行为，这证实了 SCNTs-Co/SiO 2 的更高能力。这个最好的产品用 2%、5% 和 10% 的金纳米粒子装饰，以检查金装饰对产品性能和电化学能力的影响。与简单的 SCNT 相比，所有装饰产品都具有更高的电化学效能，在装饰产品中，10% Au-SCNT 是最适合此目的的产品，与其他产品的差异很小。