Facile one-pot synthesis of CoS 2 -MoS 2 /CNTs as efficient electrocatalyst for hydrogen evolution reaction
Facile one-pot synthesis of CoS 2 -MoS 2 /CNTs as efficient electrocatalyst for hydrogen evolution reaction
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DOI：
10.1016/j.apsusc.2016.05.007
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发表时间：
2016-10
影响因子：
6.7
通讯作者：
Yanru Liu;Wenhui Hu;Xiao Li;B. Dong;Xiao Shang;Guanqun Han;Y. Chai;Yunqi Liu;Chenguang Liu-Chenguang-L
中科院分区：
文献类型：
--
作者：
Yanru Liu;Wenhui Hu;Xiao Li;B. Dong;Xiao Shang;Guanqun Han;Y. Chai;Yunqi Liu;Chenguang Liu-Chenguang-L
采用简单的水热法制备了碳纳米管负载的CoS 2-MoS 2/CNTs三元杂化电催化剂。碳纳米管作为载体可以提供良好的导电性和低团聚的层状MoS 2结构。具有本征金属导电性的CoS 2可提高三元复合电催化剂的析氢活性。X射线衍射（XRD）数据证实了由CNT、CoS 2和非晶MoS 2组成的三元杂化纳米复合材料的形成。扫描电子显微镜（SEM）图像显示，MoS 2、CNTs和正六方CoS 2之间形成了牢固的结合。各组分分散性好，无明显团聚现象。发现与CoS 2/CNTs和MoS 2/CNTs相比，三元CoS 2-MoS 2/CNTs具有更好的HER活性，具有70 mV（vs. RHE）的低起始电位和67 mV dec-1的小Talel斜率，并且在1000次循环后非常稳定。另外，Co和Mo的最佳掺杂比为2：1，具有较好的HER活性。结果表明，碳材料和Co原子的引入可以改善MoS 2基HER电催化剂的性能。
Ternary hybrid cobalt disulfide-molybdenum disulfides supported on carbon nanotubes (CoS2-MoS2/CNTs) electrocatalysts have been prepared via a simple hydrothermal method. CNTs as support may provide good conductivity and low the agglomeration of layered MoS2structure. CoS2with intrinsic metallic conductivity may enhance the activity of the ternary hybrid electrocatalysts for hydrogen evolution reaction (HER). X-ray diffraction (XRD) data confirm the formation of ternary hybrid nanocomposites composed of CNTs, CoS2and amorphous MoS2. Scanning electron microscopy (SEM) images show that strong combination between MoS2, CNTs and regular orthohexagonal CoS2has been obtained. The dispersion of each component is good and no obvious agglomeration can be observed. It is found that compared with CoS2/CNTs and MoS2/CNTs, the ternary CoS2-MoS2/CNTs have the better activity for HER with a low onset potential of 70 mV (vs. RHE) and a small Talel slope of 67 mV dec−1, and are extremely stable after 1000 cycles. In addition, the optimal doping ratio of Co to Mo is 2:1, which have better HER activity. It is proved that the introduction of carbon materials and Co atoms could improve the performances of MoS2-based electrocatalysts for HER.