Plasma Engineering of Basal Sulfur Sites on MoS2@Ni3S2 Nanorods for the Alkaline Hydrogen Evolution Reaction. Issue 6 (22nd December 2021)

• Record Type: Journal Article
• Authors: Tong, Xin; Li, Yun; Ruan, Qingdong; Pang, Ning; Zhou, Yang; Wu, Dajun; Xiong, Dayuan; Xu, Shaohui; Wang, Lianwei; Chu, Paul K.
• Is Part Of: Advanced science. Volume 9:Issue 6(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-12-22
• Subjects: active sites -- hydrogen evolution reaction -- interface engineering -- plasma doping -- 2D nanomaterials; Science -- Periodicals; 505
• DOI: 10.1002/advs.202104774
• Languages: English
• ISSNs: 2198-3844

Abstract

Abstract: Inexpensive and efficient catalysts are crucial to industrial adoption of the electrochemical hydrogen evolution reaction (HER) to produce hydrogen. Although two‐dimensional (2D) MoS2 materials have large specific surface areas, the catalytic efficiency is normally low. In this work, Ag and other dopants are plasma‐implanted into MoS2 to tailor the surface and interface to enhance the HER activity. The HER activty increases initially and then decreases with increasing dopant concentrations and implantation of Ag is observed to produce better results than Ti, Zr, Cr, N, and C. At a current density of 400 mA cm −2, the overpotential of Ag500‐MoS2 @Ni3 S2 /NF is 150 mV and the Tafel slope is 41.7 mV dec −1 . First‐principles calculation and experimental results reveal that Ag has higher hydrogen adsorption activity than the other dopants and the recovered S sites on the basal plane caused by plasma doping facilitate water splitting. In the two‐electrode overall water splitting system with Ag500‐MoS2 @Ni3 S2 /NF, a small cell voltage of 1.47 V yields 10 mA cm −2 and very little degradation is observed after operation for 70 hours. The results reveal a flexible and controllable strategy to optimize the surface and interface of MoS2 boding well for hydrogen production by commercial water splitting. Abstract : The injection of Ag plasma into MoS2 can better adjust the surface interface function to enhance the activity of hydrogen evolution reaction. These are mainly derived from injecting an appropriate amount of Ag into MoS2, which not only maintains the large surface area structure, but also activates the basal plane S atoms connected to the Ag impurities.