Fullerene as a Photoelectron Transfer Promoter Enabling Stable TiO2-Protected Sb2Se3 Photocathodes for Photo- Electrochemical Water Splitting

Title
Fullerene as a Photoelectron Transfer Promoter Enabling Stable TiO2-Protected Sb2Se3 Photocathodes for Photo- Electrochemical Water Splitting
Authors
김주선탄재완양우석오윤정이형수박재민Ramireddy Boppella문주호
Keywords
degradation mechanism; fullerene; long-term stability; photoelectron transfer promoter; TiO2-protected Sb2Se3 photocathodes
Issue Date
2019-04
Publisher
Advanced Energy Materials
Citation
VOL 9, NO 16-12
Abstract
Understanding the degradation mechanisms of photoelectrodes and improving their stability are essential for fully realizing solar‐ to‐ hydrogen conversion via photo‐ electrochemical (PEC) devices. Although amorphous TiO2 layers have been widely employed as a protective layer on top of p‐ type semiconductors to implement durable photocathodes, gradual photocurrent degradation is still unavoidable. This study elucidates the photocurrent degradation mechanisms of TiO2‐ protected Sb2Se3 photocathodes and proposes a novel interface‐ modification methodology in which fullerene (C60) is introduced as a photoelectron transfer promoter for significantly enhancing long‐ term stability. It is demonstrated that the accumulation of photogenerated electrons at the surface of the TiO2 layer induces the reductive dissolution of TiO2, accompanied by photocurrent degradation. In addition, the insertion of the C60 photoelectron transfer promoter at the Pt/TiO2 interface facilitates the rapid transfer of photogenerated electrons out of the TiO2 layer, thereby yielding enhanced stability. The Pt/C60/TiO2/Sb2Se3 device exhibits a high photocurrent density of 17 mA cm− 2 and outstanding stability over 10 h of operation, representing the best PEC performance and long‐ term stability compared with previously reported Sb2Se3‐ based photocathodes. This research not only provides in‐ depth understanding of the degradation mechanisms of TiO2‐ protected photocathodes, but also suggests a new direction to achieve durable photocathodes for photo‐ electrochemical water splitting.
URI
http://pubs.kist.re.kr/handle/201004/69122
ISSN
1614-6832
Appears in Collections:
KIST Publication > Article
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