Nickel sulfide nanocrystals for electrochemical and photoelectrochemical hydrogen generation

 

JisunYoo 유지선 (제1저자, 석사과정), In Hye Kwak, Ik Seon Kwon, Kidong Park, Doyeon Kim, Jong Hyun Lee, Soo A Lim, EunHee Cha,* and Jeunghee Park*

 

Journal of Materials Chemistry C, 2020, 8 (9), 3240-3247 (Impact factor: 6.641)

DOI: 10.1039/c9tc05703j

Abstract : Photoelectrochemical water splitting has been considered as the most promising technology for generating hydrogen energy. Herein, we report nickel sulfide nanocrystals (NCs) as excellent catalysts for electrochemical and solar-driven photoelectrochemical (PEC) hydrogen evolution. Two polymorphic NiS and NiS_1.97 NCs were synthesized with a controlled composition, and the NiS NCs showed higher electrocatalytic activity than the NiS_1.97 NCs toward the hydrogen/oxygen evolution reactions in 0.5 M H₂SO₄ and 1 M KOH. Photocathodes were fabricated by growing the NiS and NiS_1.97 NCs directly onto Si nanowire (NW) arrays. The deposition of NiS NCs results in excellent PEC performance in both acid and alkaline electroytes; the photocurrent is 10 mA cm² (at 0 V vs. RHE) and the onset potential is 0.2 V. In contrast, the Si-NiS_1.97 photocathode exhibits much lower photocurrent and less stability. Detailed structure analysis using X-ray photoelectron spectroscopy reveals that the NiS is more metallic than the NiS_1.97 and retains the same electronic structures during the catalytic reaction. The high catalytic activity of metallic NiS NCs should be the main cause of this enhanced PEC performance, promising efficient water-splitting Si-based PEC cells.