Directional Construction of Vertical Nitrogen-Doped 1T-2H MoSe2/Graphene Shell/Core Nanoflake Arrays for Efficient Hydrogen Evolution Reaction
Directional Construction of Vertical Nitrogen-Doped 1T-2H MoSe2/Graphene Shell/Core Nanoflake Arrays for Efficient Hydrogen Evolution Reaction
复制标题
定向构建垂直掺氮1T-2H MoSe2/石墨烯壳/核纳米片阵列以实现高效析氢反应
DOI：
10.1002/adma.201700748
复制
发表时间：
2017-06-06
影响因子：
29.4
通讯作者：
Tu, Jiangping
中科院分区：
文献类型：
--
作者：
Deng, Shengjue;Zhong, Yu;Tu, Jiangping
MoSe 2活性中心利用率低和反应动力学缓慢严重阻碍了其作为析氢电催化剂的工业应用。为了解决这两个问题，本文描述了将1 T MoSe 2和N掺杂剂引入垂直2 H MoSe 2/石墨烯壳/核纳米片阵列中的第一个实例，其显著提高了它们的HER活性。通过引入1 T MoSe 2和N掺杂以及独特的结构特征所带来的改善的导电性、丰富的催化活性位点和高度可及的表面积，N掺杂的1 T-2 H MoSe 2/石墨烯（N-MoSe 2/VG）壳/核纳米片阵列显示出显著增强的HER活性。值得注意的是，N-MoSe 2/VG纳米片在10 mA cm（-2）下表现出45 mV的相对低的起始电位和98 mV（vs RHE）的超电位，具有优异的长期稳定性（在20 000次循环后没有衰减），优于大多数最近报道的Mo基电催化剂。通过引入1 T相和N掺杂剂改善电化学性能的成功为开发用于其他能源相关应用的高性能MoSe 2基电极提供了新的机会。
The low utilization of active sites and sluggish reaction kinetics of MoSe2 severely impede its commercial application as electrocatalyst for hydrogen evolution reaction (HER). To address these two issues, the first example of introducing 1T MoSe2 and N dopant into vertical 2H MoSe2/graphene shell/core nanoflake arrays that remarkably boost their HER activity is herein described. By means of the improved conductivity, rich catalytic active sites and highly accessible surface area as a result of the introduction of 1T MoSe2 and N doping as well as the unique structural features, the N-doped 1T-2H MoSe2/graphene (N-MoSe2/VG) shell/core nanoflake arrays show substantially enhanced HER activity. Remarkably, the N-MoSe2/VG nanoflakes exhibit a relatively low onset potential of 45 mV and overpotential of 98 mV (vs RHE) at 10 mA cm(-2) with excellent long-term stability (no decay after 20 000 cycles), outperforming most of the recently reported Mo-based electrocatalysts. The success of improving the electrochemical performance via the introduction of 1T phase and N dopant offers new opportunities in the development of high-performance MoSe2-based electrodes for other energy-related applications.