Adjusting the Anisotropy of 1D Sb2Se3 Nanostructures for Highly Efficient Photoelectrochemical Water Splitting

Sb2Se3 has recently spurred great interest as a promising light‐absorbing material for solar energy conversion. Sb2Se3 consists of 1D covalently linked nanoribbons stacked via van der Waals forces and its properties strongly depend on the crystallographic orientation. However, strategies for adjusti...

Full description

Saved in:
Bibliographic Details
Published in:Advanced energy materials 2018-05, Vol.8 (14), p.n/a
Main Authors: Yang, Wooseok, Ahn, Jihoon, Oh, Yunjung, Tan, Jeiwan, Lee, Hyungsoo, Park, Jaemin, Kwon, Hyeok‐Chan, Kim, Juran, Jo, William, Kim, Joosun, Moon, Jooho
Format: Article
Language:English
Subjects:
Anisotropy
Antimony compounds
Arrays
Carrier transport
Crystallography
Electromagnetic absorption
Nanorods
Nanostructure
Photoelectric effect
Photoelectric emission
photoelectrochemical water splitting
Preferred orientation
Sb2Se3 nanostructures
Selenides
Solar energy conversion
Substrates
thiol‐amine mixture ratio
Titanium dioxide
Van der Waals forces
Water splitting
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Sb2Se3 has recently spurred great interest as a promising light‐absorbing material for solar energy conversion. Sb2Se3 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 Sb2Se3 nanostructures are rarely investigated. Here, a novel approach is presented to fabricate 1D Sb2Se3 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 Sb2Se3 nanorod arrays with preferred orientation, leading to fast carrier transport and enhanced photocurrent. After the deposition of TiO2 and Pt, an appropriately oriented Sb2Se3 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. A highly efficient Sb2Se3‐based photocathode for water splitting is demonstrated by adjusting the anisotropy of 1D nanostructures. A simple modulation of the Sb‐Se precursor solution enables the desired orientation control of the Sb2Se3 nanostructures, consequently resulting in fast carrier transport and enhanced photocurrent. The Sb2Se3‐based photocathode exhibits a remarkable photocurrent of 12.5 mA cm−2 at 0 V versus reversible hydrogen electrode.
ISSN:1614-6832
1614-6840
DOI:10.1002/aenm.201702888