Vertically aligned MoS2 thin film catalysts with Fe-Ni sulfide nanoparticles by one-step sulfurization for efficient solar water reduction

Seokhoon Choi, Changyeon Kim, Jae Yoon Lee, Tae Hyung Lee, Ki Chang Kwon, Sungwoo Kang, Sol A. Lee, Kyoung Soon Choi, Jun Min Suh, Kootak Hong, Sang Eon Jun, Woo Kyoung Kim, Sang Hyun Ahn, Seungwu Han, Soo Young Kim, Chul Ho Lee, Ho Won Jang

Research output: Contribution to journalArticlepeer-review

Abstract

Transferable 2-dimensional (2D) MoS2 thin films have a versatile potential for constructing highly efficient photoelectrodes when combined with conventional semiconductor light absorbers, taking advantage of its optical transparency and high electrochemical activity. Here, we firstly report fully vertically aligned MoS2 (VMS)/p-Si heterostructure photocathode for photoelectrochemical (PEC) water splitting. Furthermore, 3D iron-nickel sulfide nanoparticles of tailored atomic composition are formed simultaneously during the synthesis of VMS via one-step sulfurization to build 3D/2D transition metal sulfide (TMD) heterostructure thin film catalyst. The spectroscopic results reveal that the Fe-doped Ni3S2 nanoparticles on VMS/p-Si photocathode induce the electrochemically-benign band bending in the overall heterostructure, enabling a significant improvement in PEC performance and long-term stability. Scanning photoelectrochemical microscopy is used to vividly visualize the photocurrent enhancement by the various 3D/2D TMD heterostructures. This work provides promising strategies in developing high performance TMD-based electrocatalysts for practical applications in a wide variety of electrochemical energy conversion processes.

Original languageEnglish
Article number129369
JournalChemical Engineering Journal
Volume418
DOIs
Publication statusPublished - 2021 Aug 15

Keywords

  • Hydrogen evolution reaction
  • Molybdenum disulfide
  • Photoelectrochemical
  • Silicon photocathode
  • Vertically aligned

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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