File Download

There are no files associated with this item.

  • Find it @ UNIST can give you direct access to the published full text of this article. (UNISTARs only)
Related Researcher

이재성

Lee, Jae Sung
Eco-friendly Catalysis & Energy Lab.
Read More

Views & Downloads

Detailed Information

Cited time in webofscience Cited time in scopus
Metadata Downloads

Boosting the performance of Cu2O photocathodes for unassisted solar water splitting devices

Author(s)
Pan, LinfengKim, Jin HyunMayer, Matthew T.Son, Min-KyuUmmadisingu, AmitaLee, Jae SungHagfeldt, AndersLuo, JingshanGratzel, Michael
Issued Date
2018-06
DOI
10.1038/s41929-018-0077-6
URI
https://scholarworks.unist.ac.kr/handle/201301/25851
Fulltext
http://www.nature.com/articles/s41929-018-0077-6
Citation
NATURE CATALYSIS, v.1, no.6, pp.412 - 420
Abstract
Although large research efforts have been devoted to photoelectrochemical (PEC) water splitting in the past several decades, the lack of efficient, stable and Earth-abundant photoelectrodes remains a bottleneck for practical application. Here, we report a photocathode with a coaxial nanowire structure implementing a Cu2O/Ga2O3-buried p-n junction that achieves efficient light harvesting across the whole visible region to over 600 nm, reaching an external quantum yield for hydrogen generation close to 80%. With a photocurrent onset over +1V against the reversible hydrogen electrode and a photocurrent density of -10 mA cm(-2) at 0 V versus the reversible hydrogen electrode, our electrode constitutes the best oxide photocathode for catalytic generation of hydrogen from sunlight known today. Conformal coating via atomic-layer deposition of a TiO2 protection layer enables stable operation exceeding 100 h. Using NiMo as the hydrogen evolution catalyst, an all Earth-abundant Cu2O photocathode was achieved with stable operation in a weak alkaline electrolyte. To show the practical impact of this photocathode, we constructed an all-oxide unassisted solar water splitting tandem device using state-of-the-art BiVO4 as the photoanode, achieving -3% solar-to-hydrogen conversion efficiency.
Publisher
NATURE PUBLISHING GROUP
ISSN
2520-1158
Keyword
HYDROGEN EVOLUTIONCUPROUS-OXIDEBUFFER LAYERATOMIC LAYERCELLSNIEFFICIENTELECTRODEPOSITIONPHOTOANODESREDUCTION

qrcode

Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.