Chemical grafting of Co9S8 onto C60 for hydrogen spillover and storage
Chemical grafting of Co9S8 onto C60 for hydrogen spillover and storage
复制标题
Co9S8 化学接枝到 C60 上用于氢气溢出和储存
作者：
han lu;qin wei;zhou jia;jian jiahuang;lu songtao;wu xiaohong;fan guohua;gao peng;liu boyu
金属改性C60由于其高的理论容量而被认为是一种潜在的储氢介质。各种杂化无机化合物C60的研究兴趣日益增长。虽然一种新型的杂化无机化合物-C60的设计和合成是很难实现的，但理论上，原子氢可以通过溢出和表面扩散从无机化合物转移到相邻的C60表面。在这里，作为概念实验的证明，我们通过简单的高能球磨工艺将Co 9 S8接枝到C60上。采用拉曼、XPS、XRD、TEM、HTEM和EELS等测试手段对该比萨饼状杂化材料的组成和结构进行了表征。此外，电化学测试和计算结果表明，这两种材料之间的化学“桥”（C-S键）增强了结合强度，从而促进了C60在储氢过程中的包埋反应。结果，实现了4.03wt%的增加的储氢容量，沿着具有在50次循环后约80%的有利的循环稳定性。除去杂化纸中Co 9 S8的直接储氢作用，Co 9 S8改性剂引起的包埋反应使C60的储氢能力提高了5.9倍。基于这些实验测量和理论计算，本文报道的独特化学结构可能会启发其他基于C60的先进混合物
Metal modified C60 is considered to be a potential hydrogen storage medium due to its high theoretical capacity. Research interest is growing in various hybrid inorganic compounds-C60. While the design and synthesis of a novel hybrid inorganic compound-C60 is difficult to attain, it has been theorized that the atomic hydrogen could transfer from the inorganic compound to the adjacent C60 surfaces via spillover and surface diffusion. Here, as a proof of concept experiment, we graft Co9S8 onto C60 via a facile high energy ball milling process. The Raman, XPS, XRD, TEM, HTEM and EELS measurements have been conducted to evaluate the composition and structure of the pizza-like hybrid material. In addition, the electrochemical measurements and calculated results demonstrate that the chemical “bridges” (C–S bonds) between these two materials enhance the binding strength and, hence, facilitate the hydriding reaction of C60 during the hydrogen storage process. As a result, an increased hydrogen storage capacity of 4.03 wt% is achieved, along with a favorable cycling stability of ∼80% after 50 cycles. Excluding the direct hydrogen storage contribution from Co9S8 in the hybrid paper, the hydrogen storage ability of C60 was enhanced by 5.9× through the hydriding reaction caused by the Co9S8 modifier. Based on these experimental measurements and theoretical calculations, the unique chemical structure reported here could potentially inspire other C60-based advanced hybrid