Two-dimensional MoS2/Fe-phthalocyanine hybrid nanostructures as excellent electrocatalysts for hydrogen evolution and oxygen reduction reactions
- Authors
- Kwon, Ik Seon; Kwak, In Hye; Kim, Ju Yeon; Abbas, Hafiz Ghulam; Debela, Tekalign Terfa; Seo, Jaemin; Cho, Min Kyung; Ahn, Jae-Pyoung; Park, Jeunghee; Kang, Hong Seok
- Issue Date
- 14-8월-2019
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- NANOSCALE, v.11, no.30, pp.14266 - 14275
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANOSCALE
- Volume
- 11
- Number
- 30
- Start Page
- 14266
- End Page
- 14275
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/63527
- DOI
- 10.1039/c9nr04156g
- ISSN
- 2040-3364
- Abstract
- Two-dimensional (2D) MoS2 nanostructures have been extensively investigated in recent years because of their fascinating electrocatalytic properties. Herein, we report 2D hybrid nanostructures consisting of 1T ' phase MoS2 and Fe-phthalocyanine (FePc) molecules that exhibit excellent catalytic activity toward both the hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR). X-ray absorption spectra revealed an increased Fe-N distance (2.04 angstrom) in the hybrid complex relative to the isolated FePc. Spin-polarized density functional theory calculations predicted that the Fe center moves toward the MoS2 layer and induces a non-planar structure with an increased Fe-N distance of 2.05 angstrom, which supports the experimental results. The experiments and calculations consistently show a significant charge transfer from FePc to stabilize the hybrid complex. The excellent HER catalytic performance of FePc-MoS2 is characterized by a low Tafel slope of 32 mV dec(-1) at a current density of 10 mA cm(-2) and an overpotential of 0.123 V. The ORR catalytic activity is superior to that of the commercial Pt/C catalyst in pH 13 electrolyte, with a more positive half-wave potential (0.89 vs. 0.84 V), a smaller Tafel slope (35 vs. 87 mV center dot dec(-1)), and a much better durability (9.3% vs. 40% degradation after 20 h). Such remarkable catalytic activity is ascribed to the HER-active 1T ' phase MoS2 and the ORR-active nonplanar Fe-N-4 site of FePc.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - Graduate School > Department of Advanced Materials Chemistry > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.