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Directly Assembled 3D Molybdenum Disulfide on Silicon Wafer for Efficient Photoelectrochemical Water Reduction
Author(s) -
Andoshe Dinsefa Mensur,
Jin Gangtae,
Lee ChangSoo,
Kim Changyeon,
Kwon Ki Chang,
Choi Seokhoon,
Sohn Woonbae,
Moon Cheon Woo,
Lee Seung Hee,
Suh Jun Min,
Kang Sungwoo,
Park Jaehyun,
Heo Hoseok,
Kim Jong Kyu,
Han Seungwu,
Jo MoonHo,
Jang Ho Won
Publication year - 2018
Publication title -
advanced sustainable systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.499
H-Index - 24
ISSN - 2366-7486
DOI - 10.1002/adsu.201700142
Subject(s) - photocathode , molybdenum disulfide , overpotential , wafer , chemical vapor deposition , materials science , chemical engineering , water splitting , catalysis , silicon , hydrogen , atomic layer deposition , thin film , nanotechnology , electrochemistry , chemistry , optoelectronics , electrode , photocatalysis , organic chemistry , composite material , engineering , physics , quantum mechanics , electron
Abstract MoS 2 composed of earth‐abundant elements is considered as a promising hydrogen evolution reaction (HER) catalyst for p‐type Si photocathode owing to its appropriate hydrogen adsorption free energy for the edge sites and high photochemical stability in acidic electrolytes. However, the direct synthesis of uniform and atomically thin MoS 2 on Si by usual chemical vapor deposition techniques remains challenging because of the weak van der Waals interaction between Si and MoS 2 . Herein, by controlling the gas phase kinetics during metal–organic chemical vapor deposition, wafer‐scale direct synthesis of 3D MoS 2 films on TiO 2 ‐coated p‐type Si substrates is demonstrated. The 3D MoS 2 layer with a number of edge sites exposed to ambient substantially reduces the HER overpotential of Si photocathode and simultaneously increases the saturation current density due to the antireflection effect. Directly grown 3D MoS 2 thin films are stable under extended water reduction duration. The strategy paves the way for efficient assembly of transition metal disulfide HER catalysts on the p‐type photocathode.