P doped MoS2 nanoplates embedded in nitrogen doped carbon nanofibers as an efficient catalyst for hydrogen evolution reaction
P doped MoS2 nanoplates embedded in nitrogen doped carbon nanofibers as an efficient catalyst for hydrogen evolution reaction
复制标题
嵌入氮掺杂碳纳米纤维中的磷掺杂MoS2纳米片作为析氢反应的有效催化剂
DOI：
10.1016/j.jcis.2019.04.004
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发表时间：
2019
影响因子：
9.9
通讯作者：
Wang Guoxiu
中科院分区：
文献类型：
--
作者：
Wu Wenjian;Zhao Yufei;Li Shihong;He Baiyin;Liu Hao;Zeng Xingrong;Zhang Jinqiang;Wang Guoxiu
二维（2D）硫化钼（MoS2）由于其丰富的析氢活性位点而被认为是一种很有前途的析氢反应催化剂。然而，二硫化钼的HER性能目前受到活性位点暴露密度有限和电导率低的限制。在此，我们报告了一种简单且可扩展的静电纺丝技术，用于在一维氮掺杂碳纳米纤维（NCNFs-MoS2|P）中制备掺杂磷的二维mos2纳米板，作为高效的HER催化剂。NCNFs的空间限制生长避免了mos2纳米片的堆积和聚集，导致更多的边缘暴露位点。磷原子的引入进一步激活了二硫化钼的表面，增强了电子的转移。NCNFs-MoS2|P在10 mA cm−2下的过电位达到98 mV，表现出优异的HER催化活性。此外，稳定性试验（5000次循环或20 h）后几乎没有观察到衰减。密度泛函计算（DFT）表明，磷原子的加入显著提高了MoS2的电导率，降低了H在MoS2上的吸附能垒，导致NCNFs-MoS2|P具有较高的催化性能。
Two-dimensional (2D) molybdenum sulfide (MoS2) is considered as a promising catalyst for hydrogen evolution reaction (HER), originated from its abundant hydrogen evolution active sites. However, the HER performance of MoS2is currently hindered by the limited exposed density of the active sites and low conductivity. Herein, we report a facile and scalable electrospinning technique to fabricate 2D MoS2nanoplates doped with phosphorus within one-dimensional nitrogen doped-carbon nanofibers (NCNFs-MoS2|P) as a highly efficient HER catalyst. The space-confined growth with the presence of NCNFs avoided the stacking and aggregation of the MoS2nanoplates, resulting in more exposed edge sites. The introduction of phosphorus atoms further activated the surface of MoS2and enhanced the electron transfer. The overpotential of NCNFs-MoS2|P reached 98 mV at 10 mA cm−2, exhibiting excellent HER catalytic activity. Besides, almost no decay was observed after the stability test (5000 cycles or 20 h). The density functional calculations (DFT) elucidated that the incorporation of phosphorus atoms significantly improved the electrical conductivity and decreased the H adsorption energy barrier on MoS2, leading to a high catalytic performance of NCNFs-MoS2|P.