Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session M45: Energy - Catalysis
8:00 AM–10:24 AM,
Wednesday, March 8, 2023
Room: Room 315
Sponsoring
Unit:
GERA
Chair: Liang An, The Hong Kong Polytechnic University
Abstract: M45.00002 : Catalytic hydrogen production by isoelectronic doped MoS2*
8:12 AM–8:24 AM
Author not Attending
Presenter:
Artemii Ivanov
(Natl Univ of Singapore)
Authors:
Artemii Ivanov
(Natl Univ of Singapore)
Mo Lin
(Natl Univ of Singapore)
Guo Xiangyu
(Natl Univ of Singapore)
Pengru Huang
(Natl Univ of Singapore)
Daria Andreeva
(Ulsan Natl Inst of Sci & Tech)
Kostya S Novoselov
(Natl Univ of Singapore)
Collaboration:
I-FIM
This work reveals the doping of MoS2 monolayers by isoelectronic atoms (W and Se) in broad concentration range effects on the catalytic activity. At low concentrations (up to 30%), both dopants significantly decrease the Tafel slopes, which indicates the increasing effectivity of H2 formation. However, hydrogen formation is inhibited at high defect concentrations (35-50%). At lower doping rates, single atom defects trigger the formation of vacancies, the transition of 2H into the metastable 1T phase, and phase boundaries occurrence. These factors strongly tune up the hydrogen adsorption on the doped MoS2 surface. As the doping rate achieves 35%, defects coagulate into the pure 2H phase MoS2, WS2, and MoSe2, which inhibit the reaction.
*Research Centre of Excellence program (grant EDUN C-33-18-279-V12, I-FIM)
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