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Adjusting the Anisotropy of 1D Sb 2 Se 3 Nanostructures for Highly Efficient Photoelectrochemical Water Splitting
Author(s) -
Yang Wooseok,
Ahn Jihoon,
Oh Yunjung,
Tan Jeiwan,
Lee Hyungsoo,
Park Jaemin,
Kwon HyeokChan,
Kim Juran,
Jo William,
Kim Joosun,
Moon Jooho
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201702888
Subject(s) - photocurrent , materials science , nanostructure , nanorod , water splitting , charge carrier , nanotechnology , thioglycolic acid , electrode , anisotropy , optoelectronics , chemical engineering , photocatalysis , chemistry , optics , catalysis , biochemistry , physics , engineering , organic chemistry
Sb 2 Se 3 has recently spurred great interest as a promising light‐absorbing material for solar energy conversion. Sb 2 Se 3 consists of 1D covalently linked nanoribbons stacked via van der Waals forces and its properties strongly depend on the crystallographic orientation. However, strategies for adjusting the anisotropy of 1D Sb 2 Se 3 nanostructures are rarely investigated. Here, a novel approach is presented to fabricate 1D Sb 2 Se 3 nanostructure arrays with different aspect ratios on conductive substrates by simply spin‐coating Sb‐Se solutions with different molar ratios of thioglycolic acid and ethanolamine. A relatively small proportion of thioglycolic acid induces the growth of short Sb 2 Se 3 nanorod arrays with preferred orientation, leading to fast carrier transport and enhanced photocurrent. After the deposition of TiO 2 and Pt, an appropriately oriented Sb 2 Se 3 nanostructure array exhibits a significantly enhanced photoelectrochemical performance; the photocurrent reaches 12.5 mA cm −2 at 0 V versus reversible hydrogen electrode under air mass 1.5 global illumination.