Enhanced hydrogen evolution reaction activity of hydrogen-annealed vertical MoS(2) nanosheets.
Enhanced hydrogen evolution reaction activity of hydrogen-annealed vertical MoS(2) nanosheets.
复制标题
氢退火垂直MoS2纳米片增强析氢反应活性
DOI：
10.1039/c8ra01147h
复制
发表时间：
2018-04-17
期刊：
影响因子：
3.9
通讯作者：
Gao, Bo
中科院分区：
文献类型：
--
作者：
He, Mengci;Kong, Fanpeng;Yin, Geping;Lv, Zhe;Sun, Xiudong;Shi, Hongyan;Gao, Bo
二硫化钼（MoS 2）是一种很有前途的析氢反应（HER）电催化剂，但只有边缘和S-空位才是HER的催化活性位点，因此增加边缘位点和S-空位对于提高MoS 2的HER活性至关重要。在这里，我们报告了增强HER活性的二硫化钼结合垂直纳米片和氢气退火。与水平MoS 2纳米片相比，原始垂直MoS 2纳米片由于更大量的边缘而显示出更好的HER活性。H2退火进一步显著提高了垂直MoS 2纳米片的HER活性。采用扫描电子显微镜（SEM）、X射线光电子能谱（XPS）和电化学阻抗谱（EIS）来解释H2退火增强的HER活性。SEM图像显示，H2退火使MoS 2边缘变粗糙，导致更多的边缘位点。XPS数据显示H2退火后S：Mo比变小，意味着更多的S-空位。同时，EIS测量表明，H2退火加速了电荷转移。这些发现阐述了H2退火诱导HER活性的增强，这进一步被随后的再硫化实验所证实。垂直排列和H2退火增强了MoS 2纳米片的析氢反应活性。
Molybdenum disulfide (MoS2) is a promising electrocatalyst for hydrogen evolution reaction (HER), but only edges and S-vacancies are catalytic active sites for the HER. Therefore, it is crucial to increase edge sites and S-vacancies for enhancing the HER activity of MoS2. Here, we report an enhanced HER activity of MoS2 by combing vertical nanosheets and H2 annealing. Compared to horizontal MoS2 nanosheets, pristine vertical MoS2 nanosheets showed better HER activity due to a larger amount of edges. H2 annealing further enhanced the HER activity of vertical MoS2 nanosheets remarkably. Scanning electron microscopy (SEM), X-ray photoelectron spectra (XPS) and electrochemical impedance spectroscopy (EIS) were used to elucidate the enhanced HER activity by H2 annealing. SEM images showed that H2 annealing roughened the MoS2 edges, leading to more edge sites. XPS data revealed the smaller S : Mo ratio after H2 annealing, meaning more S-vacancies. Meanwhile, EIS measurements showed that charge transfer was accelerated by H2 annealing. These findings elaborated the H2 annealing induced enhancement of the HER activity, which were further confirmed by the subsequent re-sulfurization experiment. Vertical configuration and H2 annealing enhanced the hydrogen evolution reaction activity of MoS2 nanosheets.
登录
查看更多内容
影响因子：
15
作者：
Li, Yanguang;Wang, Hailiang;Dai, Hongjie
通讯作者：
Dai, Hongjie
影响因子：
15
作者：
Hinnemann, B;Moses, PG;Norskov, JK
通讯作者：
Norskov, JK
影响因子：
29.4
作者：
Chang, Yung-Huang;Lin, Cheng-Te;Li, Lain-Jong
通讯作者：
Li, Lain-Jong
原位制备多孔MoS2薄膜作为电化学析氢的高性能催化剂
影响因子：
4.9
作者：
Lu, Zhiyi;Zhang, Haichuan;Sun, Xiaoming
通讯作者：
Sun, Xiaoming
影响因子：
4.5
作者：
TRIBUTSCH, H;BENNETT, JC
通讯作者：
BENNETT, JC