A flower-like CoS2/MoS2 heteronanosheet array as an active and stable electrocatalyst toward the hydrogen evolution reaction in alkaline media. Issue 15 (3rd March 2020)

• Record Type: Journal Article
• Authors: Shi, Mengtong; Zhang, Yang; Zhu, Yaxing; Wang, Wei; Wang, Changzheng; Yu, Aifang; Pu, Xiong; Zhai, Junyi
• Is Part Of: RSC advances. Volume 10:Issue 15(2020)
• Page Start: 8973
• Page End: 8981
• Publication Date: 2020-03-03
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c9ra10963c
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : CoS2 /MoS2 heteronanosheet arrays with vertically aligned flower-like architecture are fabricated through in situ topotactic sulfurization of CoMoO4 nanosheet arrays. Abstract : CoS2 /MoS2 heteronanosheet arrays (HNSAs) with vertically aligned flower-like architectures are fabricated through in situ topotactic sulfurization of CoMoO4 nanosheet array (NSA) precursors on conductive Ni foam. CoMoO4 NSAs are prepared by a self-template hydrothermal method without using any hard template and surfactant. Benefiting from a 3D flower-like architecture constituted by ultrathin nanosheets with abundant exposed heterointerfaces as highly active sites and predesigned void spaces, the as-synthesized CoS2 /MoS2 HNSAs exhibit an excellent hydrogen evolution reaction (HER) performance with a low overpotential of 50 mV at 10 mA cm −2, and a small Tafel slope of 76 mV dec −1 in 1.0 M KOH, which outperforms most previously reported CoS2 and MoS2 based electrocatalysts with compositional or morphological similarity. This work demonstrates the great potential in developing high-efficiency and earth-abundant electrocatalysts for alkaline HER through heterointerface engineering and morphological design by utilizing transition metal molybdate as a promising platform.