Defect Mediated Improvements in the Photoelectrochemical Activity of MoS2/SnS2 Ultrathin Sheets on Si Photocathode for Hydrogen Evolution
Journal
ACS applied materials & interfaces
Journal Volume
14
Journal Issue
35
Pages
39896
Date Issued
2022-09-07
Author(s)
Jena, Anirudha
Pichaimuthu, Karthika
Leniec, Grzegorz
Kaczmarek, Slawomir M
Chang, Ho
Su, Chaochin
Hu, Shu-Fen
Abstract
Solar-driven water electrolysis to produce hydrogen is one of the clean energy options for the current energy-related challenges. Si as a photocathode exhibits a large overpotential due to the slow hydrogen evolution reaction (HER) kinetics and hence needs to be modified with a cocatalyst layer. MoS2 is a poor HER cocatalyst due to its inert basal plane. Activation of the MoS2 basal plane will facilitate HER kinetics. In this study, we have incorporated SnS2 into MoS2 ultrathin sheets to induce defect formation and phase transformation. MoS2/SnS2 composite ultrathin sheets with a Sn2+ state create a large number of S vacancies on the basal sites. The optimized defect-rich MoS2/SnS2 ultrathin sheets decorated on surface-modified Si micro pyramids as photocathodes show a current density of -23.8 mA/cm2 at 0 V with an onset potential of 0.23 V under acidic conditions, which is higher than that of the pristine MoS2. The incorporation of SnS2 into 2H-MoS2 ultrathin sheets not only induces a phase but also can alter the local atomic arrangement, which in turn is verified by their magnetic response. The diamagnetic SnS2 phase causes a decrease in symmetry and an increase in magnetic anisotropy of the Mo3+ ions.
Subjects
MoS2/SnS2 cocatalyst; hydrogen evolution; hydrothermal synthesis; phase transition in MoS2; photoelectrochemical water splitting; sulfur vacancies
Publisher
AMER CHEMICAL SOC
Type
journal article